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 void wlan_tx_complete(struct carl9170_tx_superframe *super,
 160                       bool txs)
 161 {
 162         struct carl9170_tx_status *status;
 163
 164         status = wlan_get_tx_status_buffer();
 165
 166         /*
 167          * The *unique* cookie and AC_ID is used by the driver for
 168          * frame lookup.
 169          */
 170         status->cookie = super->s.cookie;
 171         status->queue = super->s.queue;
 172         super->s.cookie = 0;
 173
 174         /*
 175          * This field holds the number of tries of the rate in
 176          * the rate index field (rix).
 177          */
 178         status->rix = super->s.rix;
 179         status->tries = super->s.cnt;
 180         status->success = (txs) ? 1 : 0;
 181 }
 182
 183 static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
 184 {
 185         /* check if this was the last possible retry with this rate */
 186         if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) {
 187                 /* end of the road - indicate tx failure */
 188                 if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
 189                         return false;
 190
 191                 /* check if there are alternative rates available */
 192                 if (!super->s.rr[super->s.rix].set)
 193                         return false;
 194
 195                 /* try next retry rate */
 196                 super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
 197
 198                 /* finally - mark the old rate as USED */
 199                 super->s.rix++;
 200
 201                 /* update MAC flags */
 202                 super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot;
 203                 super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu;
 204
 205                 /* reinitialize try counter */
 206                 super->s.cnt = 1;
 207         } else {
 208                 /* just increase retry counter */
 209                 super->s.cnt++;
 210         }
 211
 212         return true;
 213 }
 214
 215 static inline u16 get_tid(struct ieee80211_hdr *hdr)
 216 {
 217         return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
 218 }
 219
 220 /* This function will only work on uint32_t-aligned pointers! */
 221 static inline bool compare_ether_address(const void *_d0, const void *_d1)
 222 {
 223         const uint32_t *d0 = _d0;
 224         const uint32_t *d1 = _d1;
 225
 226         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 227         return !((d0[0] ^ d1[0]) | (unsigned short)(d0[1] ^ d1[1]));
 228 }
 229
 230 /* This function will only work on uint32_t-aligned pointers! */
 231 static bool same_hdr(const void *_d0, const void *_d1)
 232 {
 233         const uint32_t *d0 = _d0;
 234         const uint32_t *d1 = _d1;
 235
 236         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 237         return !((d0[0] ^ d1[0]) |                      /* FC + DU */
 238                  (d0[1] ^ d1[1]) |                      /* addr1 */
 239                  (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) |    /* addr2 + addr3 */
 240                  (d0[4] ^ d1[4]));                      /* addr3 */
 241 }
 242
 243 static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b)
 244 {
 245         return (get_tid(a) == get_tid(b)) || same_hdr(a, b);
 246 }
 247
 248 static void wlan_tx_ampdu_end(unsigned int qidx)
 249 {
 250         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 251
 252         fw.wlan.ampdu_prev[qidx] = NULL;
 253         if (ht_prev)
 254                 ht_prev->f.hdr.mac.ba_end = 1;
 255 }
 256
 257 static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
 258 {
 259         unsigned int qidx = super->s.queue;
 260         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 261
 262         if (!super->f.hdr.mac.ampdu) {
 263                 wlan_tx_ampdu_end(qidx);
 264         } else {
 265                 fw.wlan.ampdu_prev[qidx] = super;
 266
 267                 if (ht_prev &&
 268                     !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e))
 269                         ht_prev->f.hdr.mac.ba_end = 1;
 270                 else
 271                         super->f.hdr.mac.ba_end = 0;
 272         }
 273 }
 274
 275 /* for all tries */
 276 static void __wlan_tx(struct dma_desc *desc)
 277 {
 278         struct carl9170_tx_superframe *super = get_super(desc);
 279
 280         if (unlikely(super->s.fill_in_tsf)) {
 281                 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
 282                 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
 283
 284                 /*
 285                  * Truth be told: this is a hack.
 286                  *
 287                  * The *real* TSF is definitely going to be higher/older.
 288                  * But this hardware emulation code is head and shoulders
 289                  * above anything a driver can possibly do.
 290                  *
 291                  * (even, if it's got an accurate atomic clock source).
 292                  */
 293
 294                 read_tsf(tsf);
 295         }
 296
 297         wlan_tx_ampdu(super);
 298
 299 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
 300         wlan_tx_complete(super, true);
 301         unhide_super(desc);
 302 # ifdef CONFIG_CARL9170FW_LOOPBACK
 303         dma_put(&fw.pta.up_queue, desc);
 304         up_trigger();
 305 # elif CONFIG_CARL9170FW_DISCARD
 306         dma_reclaim(&fw.pta.down_queue, desc);
 307         down_trigger();
 308 # endif
 309 #else /* CONFIG_CARL9170FW_LOOPBACK */
 310
 311 # ifdef CONFIG_CARL9170FW_DEBUG
 312         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 313 # endif /* CONFIG_CARL9170FW_DEBUG */
 314
 315         /* insert desc into the right queue */
 316         dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
 317 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 318 }
 319
 320 static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
 321 {
 322         hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
 323         hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
 324
 325         if (!(hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG)))
 326                 fw.wlan.sequence[vif] += 0x10;
 327 }
 328
 329 /* prepares frame for the first transmission */
 330 static void _wlan_tx(struct dma_desc *desc)
 331 {
 332         struct carl9170_tx_superframe *super = get_super(desc);
 333
 334         if (unlikely(super->s.assign_seq)) {
 335                 wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
 336         }
 337
 338         if (unlikely(super->s.ampdu_commit_density)) {
 339                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 340                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 341                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 342                             super->s.ampdu_density));
 343         }
 344
 345         if (unlikely(super->s.ampdu_commit_factor)) {
 346                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 347                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 348                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 349                             8 << super->s.ampdu_factor));
 350         }
 351
 352         __wlan_tx(desc);
 353 }
 354
 355 /* propagate transmission status back to the driver */
 356 static bool wlan_tx_status(struct dma_queue *queue,
 357                            struct dma_desc *desc)
 358 {
 359         struct carl9170_tx_superframe *super = get_super(desc);
 360         unsigned int qidx = super->s.queue;
 361         bool txfail = false, success;
 362
 363         success = true;
 364
 365         /* update hangcheck */
 366         fw.wlan.last_super_num[qidx] = 0;
 367
 368         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 369                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 370
 371                 /* reset retry indicator flags */
 372                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 373
 374                 if (wlan_tx_consume_retry(super)) {
 375                         /*
 376                          * retry for simple and aggregated 802.11 frames.
 377                          *
 378                          * Note: We must not mess up the original frame
 379                          * order.
 380                          */
 381
 382                         if (!super->f.hdr.mac.ampdu) {
 383                                 /*
 384                                  * 802.11 - 7.1.3.1.5.
 385                                  * set "Retry Field" for consecutive attempts
 386                                  *
 387                                  * Note: For AMPDU see:
 388                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 389                                  */
 390                                 super->f.data.i3e.frame_control |=
 391                                         cpu_to_le16(IEEE80211_FCTL_RETRY);
 392                         }
 393
 394                         if (txfail) {
 395                                 /* Normal TX Failure */
 396
 397                                 /* demise descriptor ownership back to the hardware */
 398                                 dma_rearm(desc);
 399
 400                                 /*
 401                                  * And this will get the queue going again.
 402                                  * To understand why: you have to get the HW
 403                                  * specs... But sadly I never saw them.
 404                                  */
 405                                 wlan_txunstuck(qidx);
 406
 407                                 /* abort cycle - this is necessary due to HW design */
 408                                 return false;
 409                         } else {
 410                                 /* (HT-) BlockACK failure */
 411
 412                                 /*
 413                                  * Unlink the failed attempt and put it into
 414                                  * the retry queue. The caller routine must
 415                                  * be aware of this so the frames don't get lost.
 416                                  */
 417
 418                                 dma_unlink_head(queue);
 419                                 dma_put(&fw.wlan.tx_retry, desc);
 420                                 return true;
 421                         }
 422                 } else {
 423                         /* out of frame attempts - discard frame */
 424                         success = false;
 425                 }
 426         }
 427
 428         dma_unlink_head(queue);
 429         if (txfail) {
 430                 /*
 431                  * Issue the queue bump,
 432                  * We need to do this in case this was the frame's last
 433                  * possible retry attempt and it unfortunately: it failed.
 434                  */
 435
 436                 wlan_txunstuck(qidx);
 437         }
 438
 439         unhide_super(desc);
 440
 441 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 442         if (unlikely(super == (void *) &dma_mem.reserved.ba)) {
 443                 fw.wlan.ba_desc = desc;
 444                 fw.wlan.ba_desc_available = 1;
 445                 return true;
 446         }
 447 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 448
 449         wlan_tx_complete(super, success);
 450
 451 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 452         if (unlikely(super->s.cab))
 453                 fw.wlan.cab_queue_len[super->s.vif_id]--;
 454 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 455
 456         /* recycle freed descriptors */
 457         dma_reclaim(&fw.pta.down_queue, desc);
 458         down_trigger();
 459         return true;
 460 }
 461
 462 static void handle_tx_completion(void)
 463 {
 464         struct dma_desc *desc;
 465         int i;
 466
 467         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
 468                 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
 469                         if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
 470                                 /* termination requested. */
 471                                 break;
 472                         }
 473                 }
 474
 475                 for_each_desc(desc, &fw.wlan.tx_retry)
 476                         __wlan_tx(desc);
 477
 478                 wlan_tx_ampdu_end(i);
 479                 if (!queue_empty(&fw.wlan.tx_queue[i]))
 480                         wlan_trigger(BIT(i));
 481         }
 482 }
 483
 484 void __hot wlan_tx(struct dma_desc *desc)
 485 {
 486         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 487
 488         /* initialize rate control struct */
 489         super->s.rix = 0;
 490         super->s.cnt = 1;
 491         hide_super(desc);
 492
 493 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 494         if (unlikely(super->s.cab)) {
 495                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 496                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 497                 return;
 498         }
 499 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 500
 501         _wlan_tx(desc);
 502         wlan_trigger(BIT(super->s.queue));
 503 }
 504
 505 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 506 static void wlan_send_buffered_ba(void)
 507 {
 508         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 509         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 510         struct carl9170_bar_ctx *ctx;
 511
 512         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 513                 return;
 514
 515         /* there's no point to continue when the ba_desc is not available. */
 516         if (!fw.wlan.ba_desc_available)
 517                 return;
 518
 519         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx];
 520         fw.wlan.ba_head_idx++;
 521         fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 522
 523         /* Format BlockAck */
 524         fw.wlan.ba_desc->status = 0;
 525         fw.wlan.ba_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 526         fw.wlan.ba_desc_available = 0;
 527         fw.wlan.ba_desc->nextAddr = fw.wlan.ba_desc->lastAddr =
 528                 fw.wlan.ba_desc;
 529
 530         baf->s.len = fw.wlan.ba_desc->totalLen = fw.wlan.ba_desc->dataSize =
 531                 sizeof(struct carl9170_tx_superdesc) +
 532                 sizeof(struct ar9170_tx_hwdesc) +
 533                 sizeof(struct ieee80211_ba);
 534
 535         baf->s.ri[0].tries = 1;
 536         baf->s.queue = AR9170_TXQ_VO;
 537         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 538
 539         /* HW Duration / Backoff */
 540         baf->f.hdr.mac.backoff = 1;
 541         baf->f.hdr.mac.hw_duration = 1;
 542
 543         /* take the TX rate from the RX'd BAR */
 544         baf->f.hdr.phy.set = ctx->phy;
 545         baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 546
 547         /* format outgoing BA */
 548         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
 549         ba->duration = cpu_to_le16(0);
 550         memcpy(ba->ta, ctx->ta, 6);
 551         memcpy(ba->ra, ctx->ra, 6);
 552
 553         /*
 554          * Unfortunately, we cannot look into the hardware's scoreboard.
 555          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 556          * and send a null BlockAck.
 557          */
 558         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 559
 560         /*
 561          * NB:
 562          * not entirely sure if this is 100% correct?!
 563          */
 564         ba->control = ctx->control | cpu_to_le16(1);
 565         ba->start_seq_num = ctx->start_seq_num;
 566
 567         wlan_tx(fw.wlan.ba_desc);
 568 }
 569
 570 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 571 {
 572         struct carl9170_bar_ctx *tmp;
 573
 574         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx];
 575         fw.wlan.ba_tail_idx++;
 576         fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 577
 578         return tmp;
 579 }
 580
 581 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 582                        unsigned int len, unsigned int mac_err)
 583 {
 584         struct ieee80211_bar *bar;
 585         struct carl9170_bar_ctx *ctx;
 586
 587         if (unlikely(mac_err)) {
 588                 /*
 589                  * This check does a number of things:
 590                  * 1. checks if the frame is in good nick
 591                  * 2. checks if the RA (MAC) matches
 592                  */
 593                 return ;
 594         }
 595
 596         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 597                 /*
 598                  * Sneaky, corrupted BARs... but not with us!
 599                  */
 600
 601                 return ;
 602         }
 603
 604         bar = (void *) hdr;
 605
 606         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 607             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 608                 /* not implemented yet */
 609
 610                 return ;
 611         }
 612
 613         ctx = wlan_get_bar_cache_buffer();
 614
 615         /* Brilliant! The BAR provides all necessary MACs! */
 616         memcpy(ctx->ra, bar->ta, 6);
 617         memcpy(ctx->ta, bar->ra, 6);
 618
 619         /*
 620          * NB:
 621          * not entirely sure if this is 100% correct to force the
 622          * imm ack bit or not...
 623          */
 624         ctx->control = bar->control | cpu_to_le16(1);
 625         ctx->start_seq_num = bar->start_seq_num;
 626         ctx->phy = ar9170_rx_to_phy(desc);
 627         if (unlikely(!ctx->phy)) {
 628                 /* provide a backup, in case ar9170_rx_to_phy fails */
 629                 ctx->phy = cpu_to_le32(0x2cc301);
 630         }
 631 }
 632 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 633
 634 static void wlan_check_rx_overrun(void)
 635 {
 636         uint32_t overruns, total;
 637
 638         fw.wlan.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 639         fw.wlan.rx_overruns += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 640         if (unlikely(overruns)) {
 641                 if (overruns == total) {
 642                         DBG("RX Overrun");
 643                         fw.wlan.mac_reset++;
 644                 }
 645
 646                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 647         }
 648 }
 649
 650 #ifdef CONFIG_CARL9170FW_WOL
 651
 652 #ifdef CONFIG_CARL9170FW_WOL_MAGIC_PACKET
 653 static bool wlan_rx_wol_magic_packet(struct ieee80211_hdr *hdr, unsigned int len)
 654 {
 655         const unsigned char *data, *end, *mac;
 656         unsigned int found = 0;
 657
 658         /*
 659          * LIMITATION:
 660          * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
 661          * for MAGIC patterns!
 662          */
 663
 664         /*
 665          * TODO:
 666          * Currently, the MAGIC MAC Address is fixed to the EEPROM default.
 667          * It's possible to make it fully configurable, e.g:
 668          *
 669          * mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
 670          * But this will clash with the driver's suspend path, because it
 671          * needs to reset the registers.
 672          */
 673         mac = rom.sys.mac_address;
 674
 675         data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
 676         end = (u8 *)((unsigned long)hdr + len);
 677
 678         /*
 679          * scan for standard WOL Magic frame
 680          *
 681          * "A physical WakeOnLAN (Magic Packet) will look like this:
 682          * ---------------------------------------------------------------
 683          * | Synchronization Stream |  Target MAC |  Password (optional) |
 684          * |    6 octets            |   96 octets |   0, 4 or 6          |
 685          * ---------------------------------------------------------------
 686          *
 687          * The Synchronization Stream is defined as 6 bytes of FFh.
 688          * The Target MAC block contains 16 duplications of the IEEEaddress
 689          * of the target, with no breaks or interruptions.
 690          *
 691          * The Password field is optional, but if present, contains either
 692          * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
 693          * dissect the password, if present, according to the command-line
 694          * format that ether-wake uses, therefore, if a 4-byte password is
 695          * present, it will be dissected as an IPv4 address and if a 6-byte
 696          * password is present, it will be dissected as an Ethernet address.
 697          *
 698          * <http://wiki.wireshark.org/WakeOnLAN>
 699          */
 700
 701         while (data < end) {
 702                 if (found >= 6) {
 703                         if (*data == mac[found % 6])
 704                                 found++;
 705                         else
 706                                 found = 0;
 707                 }
 708
 709                 /* previous check might reset found counter */
 710                 if (found < 6) {
 711                         if (*data == 0xff)
 712                                 found++;
 713                         else
 714                                 found = 0;
 715                 }
 716
 717                 if (found == (6 + 16 * 6)) {
 718                         return true;
 719                 }
 720
 721                 data++;
 722         }
 723
 724         return false;
 725 }
 726 #endif /* CONFIG_CARL9170FW_WOL_MAGIC_PACKET */
 727
 728 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 729
 730 /*
 731  * Note: CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID is not a real
 732  * string. We have to be careful not to add a \0 at the end.
 733  */
 734 static const struct {
 735         u8 ssid_ie;
 736         u8 ssid_len;
 737         u8 ssid[sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1];
 738 } __packed probe_req = {
 739         .ssid_ie = WLAN_EID_SSID,
 740         .ssid_len = sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1,
 741         .ssid = CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID,
 742 };
 743
 744 static bool wlan_rx_wol_probe_ssid(struct ieee80211_hdr *hdr, unsigned int len)
 745 {
 746         const unsigned char *data, *end, *scan = (void *) &probe_req;
 747
 748         /*
 749          * IEEE 802.11-2007 7.3.2.1 specifies that the SSID is no
 750          * longer than 32 octets.
 751          */
 752         BUILD_BUG_ON((sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1) > 32);
 753
 754         if (ieee80211_is_probe_req(hdr->frame_control)) {
 755                 unsigned int i;
 756                 end = (u8 *)((unsigned long)hdr + len);
 757
 758                 /*
 759                  * The position of the SSID information element inside
 760                  * a probe request frame is more or less "fixed".
 761                  */
 762                 data = (u8 *)((struct ieee80211_mgmt *)hdr)->u.probe_req.variable;
 763                 for (i = 0; i < (unsigned int)(probe_req.ssid_len + 1); i++) {
 764                         if (scan[i] != data[i])
 765                                 return false;
 766                 }
 767
 768                 return true;
 769         }
 770
 771         return false;
 772 }
 773 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 774
 775 static void wlan_rx_wol(unsigned int rx_filter __unused, struct ieee80211_hdr *hdr __unused, unsigned int len __unused)
 776 {
 777         bool __unused wake_up = false;
 778
 779 #ifdef CONFIG_CARL9170FW_WOL_MAGIC_PACKET
 780         if (rx_filter & CARL9170_RX_FILTER_DATA)
 781                 wake_up |= wlan_rx_wol_magic_packet(hdr, len);
 782 #endif /* CONFIG_CARL9170FW_WOL_MAGIC_PACKET */
 783
 784 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 785         if (rx_filter & CARL9170_RX_FILTER_MGMT)
 786                 wake_up |= wlan_rx_wol_probe_ssid(hdr, len);
 787 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 788
 789         if (wake_up) {
 790                 fw.suspend_mode = CARL9170_AWAKE_HOST;
 791                 set(AR9170_USB_REG_WAKE_UP, AR9170_USB_WAKE_UP_WAKE);
 792         }
 793 }
 794 #endif /* CONFIG_CARL9170FW_WOL */
 795
 796 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 797 {
 798         struct ieee80211_hdr *hdr;
 799         unsigned int data_len;
 800         unsigned int rx_filter;
 801         unsigned int mac_err;
 802
 803         data_len = ar9170_get_rx_mpdu_len(desc);
 804         mac_err = ar9170_get_rx_macstatus_error(desc);
 805
 806 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 807
 808         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 809             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 810             mac_err & AR9170_RX_ERROR_BAD) {
 811                 /*
 812                  * This frame is too damaged to do anything
 813                  * useful with it.
 814                  */
 815
 816                 return CARL9170_RX_FILTER_BAD;
 817         }
 818
 819         rx_filter = 0;
 820         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 821                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 822
 823         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 824                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 825
 826         hdr = ar9170_get_rx_i3e(desc);
 827         if (likely(ieee80211_is_data(hdr->frame_control))) {
 828                 rx_filter |= CARL9170_RX_FILTER_DATA;
 829         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 830                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 831                 case IEEE80211_STYPE_BACK_REQ:
 832 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 833                         handle_bar(desc, hdr, data_len, mac_err);
 834 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 835                         /* fallthrough */
 836                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 837                         break;
 838                 case IEEE80211_STYPE_PSPOLL:
 839                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 840                         break;
 841                 default:
 842                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 843                         break;
 844                 }
 845         } else {
 846                 /* ieee80211_is_mgmt */
 847                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 848         }
 849
 850 #ifdef CONFIG_CARL9170FW_WOL
 851         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 852                 wlan_rx_wol(rx_filter, hdr, min(data_len,
 853                             (unsigned int)AR9170_BLOCK_SIZE));
 854         }
 855 #endif /* CONFIG_CARL9170FW_WOL */
 856
 857 #undef AR9170_RX_ERROR_BAD
 858
 859         return rx_filter;
 860 }
 861
 862 static void handle_rx(void)
 863 {
 864         struct dma_desc *desc;
 865
 866         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 867                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 868                         dma_put(&fw.pta.up_queue, desc);
 869                         up_trigger();
 870                 } else {
 871                         dma_reclaim(&fw.wlan.rx_queue, desc);
 872                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 873                 }
 874         }
 875 }
 876
 877 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 878 void wlan_cab_flush_queue(const unsigned int vif)
 879 {
 880         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 881         struct dma_desc *desc;
 882
 883         /* move queued frames into the main tx queues */
 884         for_each_desc(desc, cab_queue) {
 885                 struct carl9170_tx_superframe *super = get_super(desc);
 886                 if (!queue_empty(cab_queue)) {
 887                         /*
 888                          * Set MOREDATA flag for all,
 889                          * but the last queued frame.
 890                          * see: 802.11-2007 11.2.1.5 f)
 891                          *
 892                          * This is actually the reason to why
 893                          * we need to prevent the reentry.
 894                          */
 895
 896                         super->f.data.i3e.frame_control |=
 897                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 898                 } else {
 899                         super->f.data.i3e.frame_control &=
 900                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 901                 }
 902
 903                 /* ready to roll! */
 904                 _wlan_tx(desc);
 905                 wlan_trigger(BIT(super->s.queue));
 906         }
 907 }
 908
 909 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 910                                const unsigned int len)
 911 {
 912         struct ieee80211_mgmt *mgmt = addr;
 913         uint8_t *pos, *end;
 914
 915         pos = mgmt->u.beacon.variable;
 916         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 917         while (pos < end) {
 918                 if (pos + 2 + pos[1] > end)
 919                         return NULL;
 920
 921                 if (pos[0] == ie)
 922                         return pos;
 923
 924                 pos += pos[1] + 2;
 925         }
 926
 927         return NULL;
 928 }
 929
 930 void wlan_modify_beacon(const unsigned int vif,
 931         const unsigned int addr, const unsigned int len)
 932 {
 933         uint8_t *_ie;
 934         struct ieee80211_tim_ie *ie;
 935
 936         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 937         if (likely(_ie)) {
 938                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 939
 940                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 941                         /* schedule DTIM transfer */
 942                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 943                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 944                         /* undo all chances to the beacon structure */
 945                         ie->bitmap_ctrl &= ~0x1;
 946                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 947                 }
 948
 949                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 950                 if (fw.wlan.cab_flush_trigger[vif]) {
 951                         /* Set the almighty Multicast Traffic Indication Bit. */
 952                         ie->bitmap_ctrl |= 0x1;
 953                 }
 954         }
 955
 956         /*
 957          * Ideally, the sequence number should be assigned by the TX arbiter
 958          * hardware. But AFAIK that's not possible, so we have to go for the
 959          * next best thing and write it into the beacon fifo during the open
 960          * beacon update window.
 961          */
 962
 963         wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
 964 }
 965 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 966
 967 static void handle_beacon_config(void)
 968 {
 969         uint32_t bcn_count;
 970
 971         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 972         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 973                          (uint8_t *) &bcn_count);
 974 }
 975
 976 static void handle_pretbtt(void)
 977 {
 978 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 979         fw.wlan.cab_flush_time = get_clock_counter();
 980 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 981
 982         rf_psm();
 983
 984         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 985                          (uint8_t *) &fw.phy.psm.state);
 986 }
 987
 988 static void handle_atim(void)
 989 {
 990         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 991 }
 992
 993 #ifdef CONFIG_CARL9170FW_DEBUG
 994 static void handle_qos(void)
 995 {
 996         /*
 997          * What is the QoS Bit used for?
 998          * Is it only an indicator for TXOP & Burst, or
 999          * should we do something here?
1000          */
1001 }
1002
1003 static void handle_radar(void)
1004 {
1005         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
1006 }
1007 #endif /* CONFIG_CARL9170FW_DEBUG */
1008
1009 static void wlan_janitor(void)
1010 {
1011 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
1012         unsigned int i;
1013
1014         for (i = 0; i < CARL9170_INTF_NUM; i++) {
1015                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
1016                         /*
1017                          * This is hardcoded into carl9170usb driver.
1018                          *
1019                          * The driver must set the PRETBTT event to beacon_interval -
1020                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
1021                          *
1022                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
1023                          * 11.2.1.6. Let's hope the current solution is adequate enough.
1024                          */
1025
1026                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
1027                                 wlan_cab_flush_queue(i);
1028
1029                                 /*
1030                                  * This prevents the code from sending new BC/MC frames
1031                                  * which were queued after the previous buffered traffic
1032                                  * has been sent out... They will have to wait until the
1033                                  * next DTIM beacon comes along.
1034                                  */
1035                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
1036                         }
1037                 }
1038
1039         }
1040 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
1041
1042         wlan_send_buffered_tx_status();
1043
1044 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
1045         wlan_send_buffered_ba();
1046 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
1047 }
1048
1049 void handle_wlan(void)
1050 {
1051         uint32_t intr;
1052
1053         intr = get(AR9170_MAC_REG_INT_CTRL);
1054         /* ACK Interrupt */
1055         set(AR9170_MAC_REG_INT_CTRL, intr);
1056
1057 #define HANDLER(intr, flag, func)                       \
1058         do {                                            \
1059                 if ((intr & flag) != 0) {               \
1060                         func();                         \
1061                 }                                       \
1062         } while (0)
1063
1064         intr |= fw.wlan.soft_int;
1065         fw.wlan.soft_int = 0;
1066
1067         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
1068
1069         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
1070
1071         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
1072
1073         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
1074                 handle_tx_completion);
1075
1076 #ifdef CONFIG_CARL9170FW_DEBUG
1077         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
1078
1079         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
1080 #endif /* CONFIG_CARL9170FW_DEBUG */
1081
1082         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
1083
1084         if (unlikely(intr))
1085                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
1086
1087         wlan_janitor();
1088
1089 #undef HANDLER
1090 }
1091
1092 enum {
1093         CARL9170FW_TX_MAC_BUMP = 4,
1094         CARL9170FW_TX_MAC_DEBUG = 6,
1095         CARL9170FW_TX_MAC_RESET = 7,
1096 };
1097
1098 static void wlan_check_hang(void)
1099 {
1100         struct dma_desc *desc;
1101         int i;
1102
1103         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1104                 if (queue_empty(&fw.wlan.tx_queue[i])) {
1105                         /* Nothing to do here... move along */
1106                         continue;
1107                 }
1108
1109                 /* fetch the current DMA queue position */
1110                 desc = get_wlan_txq_addr(i);
1111
1112                 /* Stuck frame detection */
1113                 if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
1114                         fw.wlan.last_super_num[i]++;
1115
1116                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
1117                                 /*
1118                                  * schedule MAC reset (aka OFF/ON => dead)
1119                                  *
1120                                  * This will almost certainly kill
1121                                  * the device for good, but it's the
1122                                  * recommended thing to do...
1123                                  */
1124
1125                                 fw.wlan.mac_reset++;
1126                         }
1127
1128 #ifdef CONFIG_CARL9170FW_DEBUG
1129                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
1130                                 /*
1131                                  * Sigh, the queue is almost certainly
1132                                  * dead. Dump the queue content to the
1133                                  * user, maybe we find out why it got
1134                                  * so stuck.
1135                                  */
1136
1137                                 wlan_dump_queue(i);
1138                         }
1139 #endif /* CONFIG_CARL9170FW_DEBUG */
1140
1141 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1142                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
1143                                 /*
1144                                  * Hrrm, bump the queue a bit.
1145                                  * maybe this will get it going again.
1146                                  */
1147
1148                                 wlan_dma_bump(i);
1149                                 wlan_trigger(BIT(i));
1150                         }
1151 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1152                 } else {
1153                         /* Nothing stuck */
1154                         fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
1155                         fw.wlan.last_super_num[i] = 0;
1156                 }
1157         }
1158 }
1159
1160 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1161 /*
1162  * NB: Resetting the MAC is a two-edged sword.
1163  * On most occasions, it does what it is supposed to do.
1164  * But there is a chance that this will make it
1165  * even worse and the radio dies silently.
1166  */
1167 static void wlan_mac_reset(void)
1168 {
1169         uint32_t val;
1170         uint32_t agg_wait_counter;
1171         uint32_t agg_density;
1172         uint32_t bcn_start_addr;
1173         uint32_t rctl, rcth;
1174         uint32_t cam_mode;
1175         uint32_t ack_power;
1176         uint32_t rts_cts_tpc;
1177         uint32_t rts_cts_rate;
1178         int i;
1179
1180 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1181         uint32_t rx_BB;
1182 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1183
1184 #ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
1185         INFO("MAC RESET");
1186 #endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
1187
1188         /* Save aggregation parameters */
1189         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1190         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1191
1192         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1193
1194         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1195         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1196         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1197
1198         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1199         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1200         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1201
1202 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1203         /* 0x1c8960 write only */
1204         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1205 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1206
1207         /* TX/RX must be stopped by now */
1208         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1209
1210         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1211
1212         /*
1213          * Manipulate CCA threshold to stop transmission
1214          *
1215          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1216          */
1217
1218         /*
1219          * check Rx state in 0(idle) 9(disable)
1220          *
1221          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1222          * while( (chState != 0) && (chState != 9)) {
1223          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1224          * }
1225          */
1226
1227         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1228
1229         delay(2);
1230
1231         /* Restore aggregation parameters */
1232         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1233         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1234
1235         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1236         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1237         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1238         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1239
1240         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1241         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1242         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1243
1244 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1245         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1246 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1247
1248         /*
1249          * Manipulate CCA threshold to resume transmission
1250          *
1251          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1252          */
1253
1254         val = AR9170_DMA_TRIGGER_RXQ;
1255         /* Reinitialize all WLAN TX DMA queues. */
1256         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1257                 struct dma_desc *iter;
1258
1259                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1260
1261                 /* kill the stuck frame */
1262                 if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
1263                     fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
1264                     fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
1265                         struct carl9170_tx_superframe *super = get_super(iter);
1266
1267                         iter->status = AR9170_OWN_BITS_SW;
1268                         /*
1269                          * Mark the frame as failed.
1270                          * The BAFAIL flag allows the frame to sail through
1271                          * wlan_tx_status without much "unstuck" trouble.
1272                          */
1273                         iter->ctrl &= ~(AR9170_CTRL_FAIL);
1274                         iter->ctrl |= AR9170_CTRL_BAFAIL;
1275
1276                         super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
1277                         super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
1278
1279                         fw.wlan.last_super_num[i] = 0;
1280                         fw.wlan.last_super[i] = NULL;
1281                         iter = iter->lastAddr->nextAddr;
1282                 }
1283
1284                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1285                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1286                         val |= BIT(i);
1287
1288                 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]),
1289                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1290                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1291         }
1292
1293         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1294                             AR9170_MAC_INT_RETRY_FAIL;
1295
1296         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1297         wlan_trigger(val);
1298 }
1299 #else
1300 static void wlan_mac_reset(void)
1301 {
1302         /* The driver takes care of reinitializing the device */
1303         BUG("MAC RESET");
1304 }
1305 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1306
1307 void __cold wlan_timer(void)
1308 {
1309         unsigned int cached_mac_reset;
1310
1311         cached_mac_reset = fw.wlan.mac_reset;
1312
1313         /* TX Queue Hang check */
1314         wlan_check_hang();
1315
1316         /* RX Overrun check */
1317         wlan_check_rx_overrun();
1318
1319         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1320                 wlan_mac_reset();
1321                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1322         } else {
1323                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1324                         fw.wlan.mac_reset--;
1325         }
1326 }