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, 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
 485 void __hot wlan_tx(struct dma_desc *desc)
 486 {
 487         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 488
 489         /* initialize rate control struct */
 490         super->s.rix = 0;
 491         super->s.cnt = 1;
 492         hide_super(desc);
 493
 494 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 495         if (unlikely(super->s.cab)) {
 496                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 497                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 498                 return;
 499         }
 500 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 501
 502         _wlan_tx(desc);
 503         wlan_trigger(BIT(super->s.queue));
 504 }
 505
 506 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 507 static void wlan_send_buffered_ba(void)
 508 {
 509         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 510         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 511         struct carl9170_bar_ctx *ctx;
 512
 513         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 514                 return;
 515
 516         /* there's no point to continue when the ba_desc is not available. */
 517         if (!fw.wlan.ba_desc_available)
 518                 return;
 519
 520         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 521         fw.wlan.ba_head_idx++;
 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 = 3;
 536         baf->s.queue = 0;
 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         /* expire oldest entry, if we ran out of ba_ctx' */
 575         if (fw.wlan.ba_head_idx + CONFIG_CARL9170FW_BACK_REQS_NUM < fw.wlan.ba_tail_idx)
 576                 fw.wlan.ba_head_idx++;
 577
 578         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 579         fw.wlan.ba_tail_idx++;
 580
 581         return tmp;
 582 }
 583
 584 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 585                        unsigned int len, unsigned int mac_err)
 586 {
 587         struct ieee80211_bar *bar;
 588         struct carl9170_bar_ctx *ctx;
 589
 590         if (unlikely(mac_err)) {
 591                 /*
 592                  * This check does a number of things:
 593                  * 1. checks if the frame is in good nick
 594                  * 2. checks if the RA (MAC) matches
 595                  */
 596                 return ;
 597         }
 598
 599         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 600                 /*
 601                  * Sneaky, corrupted BARs... but not with us!
 602                  */
 603
 604                 return ;
 605         }
 606
 607         bar = (void *) hdr;
 608
 609         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 610             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 611                 /* not implemented yet */
 612
 613                 return ;
 614         }
 615
 616         ctx = wlan_get_bar_cache_buffer();
 617
 618         /* Brilliant! The BAR provides all necessary MACs! */
 619         memcpy(ctx->ra, bar->ta, 6);
 620         memcpy(ctx->ta, bar->ra, 6);
 621
 622         /*
 623          * NB:
 624          * not entirely sure if this is 100% correct to force the
 625          * imm ack bit or not...
 626          */
 627         ctx->control = bar->control | cpu_to_le16(1);
 628         ctx->start_seq_num = bar->start_seq_num;
 629         ctx->phy = ar9170_rx_to_phy(desc);
 630         if (unlikely(!ctx->phy)) {
 631                 /* provide a backup, in case ar9170_rx_to_phy fails */
 632                 ctx->phy = cpu_to_le32(0x2cc301);
 633         }
 634 }
 635 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 636
 637 static void wlan_check_rx_overrun(void)
 638 {
 639         uint32_t overruns, total;
 640
 641         fw.wlan.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 642         fw.wlan.rx_overruns += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 643         if (unlikely(overruns)) {
 644                 if (overruns == total) {
 645                         DBG("RX Overrun");
 646                         fw.wlan.mac_reset++;
 647                 }
 648
 649                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 650         }
 651 }
 652
 653 #ifdef CONFIG_CARL9170FW_WOL
 654
 655 #ifdef CONFIG_CARL9170FW_WOL_MAGIC_PACKET
 656 static bool wlan_rx_wol_magic_packet(struct ieee80211_hdr *hdr, unsigned int len)
 657 {
 658         const unsigned char *data, *end, *mac;
 659         unsigned int found = 0;
 660
 661         /*
 662          * LIMITATION:
 663          * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
 664          * for MAGIC patterns!
 665          */
 666
 667         /*
 668          * TODO:
 669          * Currently, the MAGIC MAC Address is fixed to the EEPROM default.
 670          * It's possible to make it fully configurable, e.g:
 671          *
 672          * mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
 673          * But this will clash with the driver's suspend path, because it
 674          * needs to reset the registers.
 675          */
 676         mac = rom.sys.mac_address;
 677
 678         data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
 679         end = (u8 *)((unsigned long)hdr + len);
 680
 681         /*
 682          * scan for standard WOL Magic frame
 683          *
 684          * "A physical WakeOnLAN (Magic Packet) will look like this:
 685          * ---------------------------------------------------------------
 686          * | Synchronization Stream |  Target MAC |  Password (optional) |
 687          * |    6 octets            |   96 octets |   0, 4 or 6          |
 688          * ---------------------------------------------------------------
 689          *
 690          * The Synchronization Stream is defined as 6 bytes of FFh.
 691          * The Target MAC block contains 16 duplications of the IEEEaddress
 692          * of the target, with no breaks or interruptions.
 693          *
 694          * The Password field is optional, but if present, contains either
 695          * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
 696          * dissect the password, if present, according to the command-line
 697          * format that ether-wake uses, therefore, if a 4-byte password is
 698          * present, it will be dissected as an IPv4 address and if a 6-byte
 699          * password is present, it will be dissected as an Ethernet address.
 700          *
 701          * <http://wiki.wireshark.org/WakeOnLAN>
 702          */
 703
 704         while (data < end) {
 705                 if (found >= 6) {
 706                         if (*data == mac[found % 6])
 707                                 found++;
 708                         else
 709                                 found = 0;
 710                 }
 711
 712                 /* previous check might reset found counter */
 713                 if (found < 6) {
 714                         if (*data == 0xff)
 715                                 found++;
 716                         else
 717                                 found = 0;
 718                 }
 719
 720                 if (found == (6 + 16 * 6)) {
 721                         return true;
 722                 }
 723
 724                 data++;
 725         }
 726
 727         return false;
 728 }
 729 #endif /* CONFIG_CARL9170FW_WOL_MAGIC_PACKET */
 730
 731 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 732
 733 /*
 734  * Note: CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID is not a real
 735  * string. We have to be careful not to add a \0 at the end.
 736  */
 737 static const struct {
 738         u8 ssid_ie;
 739         u8 ssid_len;
 740         u8 ssid[sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1];
 741 } __packed probe_req = {
 742         .ssid_ie = WLAN_EID_SSID,
 743         .ssid_len = sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1,
 744         .ssid = CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID,
 745 };
 746
 747 static bool wlan_rx_wol_probe_ssid(struct ieee80211_hdr *hdr, unsigned int len)
 748 {
 749         const unsigned char *data, *end, *scan = (void *) &probe_req;
 750
 751         /*
 752          * IEEE 802.11-2007 7.3.2.1 specifies that the SSID is no
 753          * longer than 32 octets.
 754          */
 755         BUILD_BUG_ON((sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1) > 32);
 756
 757         if (ieee80211_is_probe_req(hdr->frame_control)) {
 758                 unsigned int i;
 759                 end = (u8 *)((unsigned long)hdr + len);
 760
 761                 /*
 762                  * The position of the SSID information element inside
 763                  * a probe request frame is more or less "fixed".
 764                  */
 765                 data = (u8 *)((struct ieee80211_mgmt *)hdr)->u.probe_req.variable;
 766                 for (i = 0; i < (unsigned int)(probe_req.ssid_len + 1); i++) {
 767                         if (scan[i] != data[i])
 768                                 return false;
 769                 }
 770
 771                 return true;
 772         }
 773
 774         return false;
 775 }
 776 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 777
 778 static void wlan_rx_wol(unsigned int rx_filter __unused, struct ieee80211_hdr *hdr __unused, unsigned int len __unused)
 779 {
 780         bool __unused wake_up = false;
 781
 782 #ifdef CONFIG_CARL9170FW_WOL_MAGIC_PACKET
 783         if (rx_filter & CARL9170_RX_FILTER_DATA)
 784                 wake_up |= wlan_rx_wol_magic_packet(hdr, len);
 785 #endif /* CONFIG_CARL9170FW_WOL_MAGIC_PACKET */
 786
 787 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 788         if (rx_filter & CARL9170_RX_FILTER_MGMT)
 789                 wake_up |= wlan_rx_wol_probe_ssid(hdr, len);
 790 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 791
 792         if (wake_up) {
 793                 fw.suspend_mode = CARL9170_AWAKE_HOST;
 794                 set(AR9170_USB_REG_WAKE_UP, AR9170_USB_WAKE_UP_WAKE);
 795         }
 796 }
 797 #endif /* CONFIG_CARL9170FW_WOL */
 798
 799 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 800 {
 801         struct ieee80211_hdr *hdr;
 802         unsigned int data_len;
 803         unsigned int rx_filter;
 804         unsigned int mac_err;
 805
 806         data_len = ar9170_get_rx_mpdu_len(desc);
 807         mac_err = ar9170_get_rx_macstatus_error(desc);
 808
 809 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 810
 811         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 812             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 813             mac_err & AR9170_RX_ERROR_BAD) {
 814                 /*
 815                  * This frame is too damaged to do anything
 816                  * useful with it.
 817                  */
 818
 819                 return CARL9170_RX_FILTER_BAD;
 820         }
 821
 822         rx_filter = 0;
 823         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 824                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 825
 826         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 827                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 828
 829         hdr = ar9170_get_rx_i3e(desc);
 830         if (likely(ieee80211_is_data(hdr->frame_control))) {
 831                 rx_filter |= CARL9170_RX_FILTER_DATA;
 832         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 833                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 834                 case IEEE80211_STYPE_BACK_REQ:
 835 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 836                         handle_bar(desc, hdr, data_len, mac_err);
 837 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 838                         /* fallthrough */
 839                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 840                         break;
 841                 case IEEE80211_STYPE_PSPOLL:
 842                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 843                         break;
 844                 default:
 845                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 846                         break;
 847                 }
 848         } else {
 849                 /* ieee80211_is_mgmt */
 850                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 851         }
 852
 853 #ifdef CONFIG_CARL9170FW_WOL
 854         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 855                 wlan_rx_wol(rx_filter, hdr, min(data_len,
 856                             (unsigned int)AR9170_BLOCK_SIZE));
 857         }
 858 #endif /* CONFIG_CARL9170FW_WOL */
 859
 860 #undef AR9170_RX_ERROR_BAD
 861
 862         return rx_filter;
 863 }
 864
 865 static void handle_rx(void)
 866 {
 867         struct dma_desc *desc;
 868
 869         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 870                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 871                         dma_put(&fw.pta.up_queue, desc);
 872                         up_trigger();
 873                 } else {
 874                         dma_reclaim(&fw.wlan.rx_queue, desc);
 875                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 876                 }
 877         }
 878 }
 879
 880 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 881 void wlan_cab_flush_queue(const unsigned int vif)
 882 {
 883         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 884         struct dma_desc *desc;
 885
 886         /* move queued frames into the main tx queues */
 887         for_each_desc(desc, cab_queue) {
 888                 struct carl9170_tx_superframe *super = get_super(desc);
 889                 if (!queue_empty(cab_queue)) {
 890                         /*
 891                          * Set MOREDATA flag for all,
 892                          * but the last queued frame.
 893                          * see: 802.11-2007 11.2.1.5 f)
 894                          *
 895                          * This is actually the reason to why
 896                          * we need to prevent the reentry.
 897                          */
 898
 899                         super->f.data.i3e.frame_control |=
 900                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 901                 } else {
 902                         super->f.data.i3e.frame_control &=
 903                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 904                 }
 905
 906                 /* ready to roll! */
 907                 _wlan_tx(desc);
 908                 wlan_trigger(BIT(super->s.queue));
 909         }
 910 }
 911
 912 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 913                                const unsigned int len)
 914 {
 915         struct ieee80211_mgmt *mgmt = addr;
 916         uint8_t *pos, *end;
 917
 918         pos = mgmt->u.beacon.variable;
 919         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 920         while (pos < end) {
 921                 if (pos + 2 + pos[1] > end)
 922                         return NULL;
 923
 924                 if (pos[0] == ie)
 925                         return pos;
 926
 927                 pos += pos[1] + 2;
 928         }
 929
 930         return NULL;
 931 }
 932
 933 void wlan_modify_beacon(const unsigned int vif,
 934         const unsigned int addr, const unsigned int len)
 935 {
 936         uint8_t *_ie;
 937         struct ieee80211_tim_ie *ie;
 938
 939         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 940         if (likely(_ie)) {
 941                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 942
 943                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 944                         /* schedule DTIM transfer */
 945                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 946                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 947                         /* undo all chances to the beacon structure */
 948                         ie->bitmap_ctrl &= ~0x1;
 949                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 950                 }
 951
 952                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 953                 if (fw.wlan.cab_flush_trigger[vif]) {
 954                         /* Set the almighty Multicast Traffic Indication Bit. */
 955                         ie->bitmap_ctrl |= 0x1;
 956                 }
 957         }
 958
 959         /*
 960          * Ideally, the sequence number should be assigned by the TX arbiter
 961          * hardware. But AFAIK that's not possible, so we have to go for the
 962          * next best thing and write it into the beacon fifo during the open
 963          * beacon update window.
 964          */
 965
 966         wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
 967 }
 968 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 969
 970 static void handle_beacon_config(void)
 971 {
 972         uint32_t bcn_count;
 973
 974         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 975         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 976                          (uint8_t *) &bcn_count);
 977 }
 978
 979 static void handle_pretbtt(void)
 980 {
 981 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 982         fw.wlan.cab_flush_time = get_clock_counter();
 983 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 984
 985         rf_psm();
 986
 987         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 988                          (uint8_t *) &fw.phy.psm.state);
 989 }
 990
 991 static void handle_atim(void)
 992 {
 993         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 994 }
 995
 996 #ifdef CONFIG_CARL9170FW_DEBUG
 997 static void handle_qos(void)
 998 {
 999         /*
1000          * What is the QoS Bit used for?
1001          * Is it only an indicator for TXOP & Burst, or
1002          * should we do something here?
1003          */
1004 }
1005
1006 static void handle_radar(void)
1007 {
1008         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
1009 }
1010 #endif /* CONFIG_CARL9170FW_DEBUG */
1011
1012 static void wlan_janitor(void)
1013 {
1014 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
1015         unsigned int i;
1016
1017         for (i = 0; i < CARL9170_INTF_NUM; i++) {
1018                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
1019                         /*
1020                          * This is hardcoded into carl9170usb driver.
1021                          *
1022                          * The driver must set the PRETBTT event to beacon_interval -
1023                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
1024                          *
1025                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
1026                          * 11.2.1.6. Let's hope the current solution is adequate enough.
1027                          */
1028
1029                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
1030                                 wlan_cab_flush_queue(i);
1031
1032                                 /*
1033                                  * This prevents the code from sending new BC/MC frames
1034                                  * which were queued after the previous buffered traffic
1035                                  * has been sent out... They will have to wait until the
1036                                  * next DTIM beacon comes along.
1037                                  */
1038                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
1039                         }
1040                 }
1041
1042         }
1043 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
1044
1045         wlan_send_buffered_tx_status();
1046
1047 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
1048         wlan_send_buffered_ba();
1049 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
1050 }
1051
1052 void handle_wlan(void)
1053 {
1054         uint32_t intr;
1055
1056         intr = get(AR9170_MAC_REG_INT_CTRL);
1057         /* ACK Interrupt */
1058         set(AR9170_MAC_REG_INT_CTRL, intr);
1059
1060 #define HANDLER(intr, flag, func)                       \
1061         do {                                            \
1062                 if ((intr & flag) != 0) {               \
1063                         func();                         \
1064                 }                                       \
1065         } while (0)
1066
1067         intr |= fw.wlan.soft_int;
1068         fw.wlan.soft_int = 0;
1069
1070         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
1071
1072         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
1073
1074         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
1075
1076         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
1077                 handle_tx_completion);
1078
1079 #ifdef CONFIG_CARL9170FW_DEBUG
1080         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
1081
1082         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
1083 #endif /* CONFIG_CARL9170FW_DEBUG */
1084
1085         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
1086
1087         if (unlikely(intr))
1088                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
1089
1090         wlan_janitor();
1091
1092 #undef HANDLER
1093 }
1094
1095 enum {
1096         CARL9170FW_TX_MAC_BUMP = 4,
1097         CARL9170FW_TX_MAC_DEBUG = 6,
1098         CARL9170FW_TX_MAC_RESET = 7,
1099 };
1100
1101 static void wlan_check_hang(void)
1102 {
1103         struct dma_desc *desc;
1104         int i;
1105
1106         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1107                 if (queue_empty(&fw.wlan.tx_queue[i])) {
1108                         /* Nothing to do here... move along */
1109                         continue;
1110                 }
1111
1112                 /* fetch the current DMA queue position */
1113                 desc = get_wlan_txq_addr(i);
1114
1115                 /* Stuck frame detection */
1116                 if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
1117                         fw.wlan.last_super_num[i]++;
1118
1119                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
1120                                 /*
1121                                  * schedule MAC reset (aka OFF/ON => dead)
1122                                  *
1123                                  * This will almost certainly kill
1124                                  * the device for good, but it's the
1125                                  * recommended thing to do...
1126                                  */
1127
1128                                 fw.wlan.mac_reset++;
1129                         }
1130
1131 #ifdef CONFIG_CARL9170FW_DEBUG
1132                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
1133                                 /*
1134                                  * Sigh, the queue is almost certainly
1135                                  * dead. Dump the queue content to the
1136                                  * user, maybe we find out why it got
1137                                  * so stuck.
1138                                  */
1139
1140                                 wlan_dump_queue(i);
1141                         }
1142 #endif /* CONFIG_CARL9170FW_DEBUG */
1143
1144 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1145                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
1146                                 /*
1147                                  * Hrrm, bump the queue a bit.
1148                                  * maybe this will get it going again.
1149                                  */
1150
1151                                 wlan_dma_bump(i);
1152                                 wlan_trigger(BIT(i));
1153                         }
1154 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1155                 } else {
1156                         /* Nothing stuck */
1157                         fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
1158                         fw.wlan.last_super_num[i] = 0;
1159                 }
1160         }
1161 }
1162
1163 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1164 /*
1165  * NB: Resetting the MAC is a two-edged sword.
1166  * On most occasions, it does what it is supposed to do.
1167  * But there is a chance that this will make it
1168  * even worse and the radio dies silently.
1169  */
1170 static void wlan_mac_reset(void)
1171 {
1172         uint32_t val;
1173         uint32_t agg_wait_counter;
1174         uint32_t agg_density;
1175         uint32_t bcn_start_addr;
1176         uint32_t rctl, rcth;
1177         uint32_t cam_mode;
1178         uint32_t ack_power;
1179         uint32_t rts_cts_tpc;
1180         uint32_t rts_cts_rate;
1181         int i;
1182
1183 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1184         uint32_t rx_BB;
1185 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1186
1187 #ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
1188         INFO("MAC RESET");
1189 #endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
1190
1191         /* Save aggregation parameters */
1192         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1193         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1194
1195         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1196
1197         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1198         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1199         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1200
1201         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1202         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1203         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1204
1205 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1206         /* 0x1c8960 write only */
1207         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1208 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1209
1210         /* TX/RX must be stopped by now */
1211         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1212
1213         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1214
1215         /*
1216          * Manipulate CCA threshold to stop transmission
1217          *
1218          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1219          */
1220
1221         /*
1222          * check Rx state in 0(idle) 9(disable)
1223          *
1224          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1225          * while( (chState != 0) && (chState != 9)) {
1226          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1227          * }
1228          */
1229
1230         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1231
1232         delay(2);
1233
1234         /* Restore aggregation parameters */
1235         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1236         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1237
1238         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1239         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1240         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1241         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1242
1243         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1244         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1245         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1246
1247 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1248         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1249 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1250
1251         /*
1252          * Manipulate CCA threshold to resume transmission
1253          *
1254          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1255          */
1256
1257         val = AR9170_DMA_TRIGGER_RXQ;
1258         /* Reinitialize all WLAN TX DMA queues. */
1259         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1260                 struct dma_desc *iter;
1261
1262                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1263
1264                 /* kill the stuck frame */
1265                 if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
1266                     fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
1267                     fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
1268                         struct carl9170_tx_superframe *super = get_super(iter);
1269
1270                         iter->status = AR9170_OWN_BITS_SW;
1271                         /*
1272                          * Mark the frame as failed.
1273                          * The BAFAIL flag allows the frame to sail through
1274                          * wlan_tx_status without much "unstuck" trouble.
1275                          */
1276                         iter->ctrl &= ~(AR9170_CTRL_FAIL);
1277                         iter->ctrl |= AR9170_CTRL_BAFAIL;
1278
1279                         super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
1280                         super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
1281
1282                         fw.wlan.last_super_num[i] = 0;
1283                         fw.wlan.last_super[i] = NULL;
1284                         iter = iter->lastAddr->nextAddr;
1285                 }
1286
1287                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1288                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1289                         val |= BIT(i);
1290
1291                 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]),
1292                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1293                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1294         }
1295
1296         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1297                             AR9170_MAC_INT_RETRY_FAIL;
1298
1299         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1300         wlan_trigger(val);
1301 }
1302 #else
1303 static void wlan_mac_reset(void)
1304 {
1305         /* The driver takes care of reinitializing the device */
1306         BUG("MAC RESET");
1307 }
1308 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1309
1310 void __cold wlan_timer(void)
1311 {
1312         unsigned int cached_mac_reset;
1313
1314         cached_mac_reset = fw.wlan.mac_reset;
1315
1316         /* TX Queue Hang check */
1317         wlan_check_hang();
1318
1319         /* RX Overrun check */
1320         wlan_check_rx_overrun();
1321
1322         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1323                 wlan_mac_reset();
1324                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1325         } else {
1326                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1327                         fw.wlan.mac_reset--;
1328         }
1329 }