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
  35 static void wlan_txunstuck(unsigned int queue)
  36 {
  37         set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1);
  38 }
  39
  40 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
  41 static void wlan_txupdate(unsigned int queue)
  42 {
  43         set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head));
  44 }
  45
  46 static void wlan_dma_bump(unsigned int qidx)
  47 {
  48         unsigned int offset = qidx;
  49         uint32_t status, trigger;
  50
  51         status = get(AR9170_MAC_REG_DMA_STATUS) >> 12;
  52         trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12;
  53
  54         while (offset != 0) {
  55                 status >>= 4;
  56                 trigger >>= 4;
  57                 offset--;
  58         }
  59
  60         status &= 0xf;
  61         trigger &= 0xf;
  62
  63         if ((trigger == 0xa) && (status == 0x8)) {
  64                 DBG("UNSTUCK");
  65                 wlan_txunstuck(qidx);
  66         } else {
  67                 DBG("UPDATE");
  68                 wlan_txupdate(qidx);
  69         }
  70 }
  71 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
  72
  73 #ifdef CONFIG_CARL9170FW_DEBUG
  74 static void wlan_dump_queue(unsigned int qidx)
  75 {
  76
  77         struct dma_desc *desc;
  78         struct carl9170_tx_superframe *super;
  79         int entries = 0;
  80
  81         __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
  82                 super = get_super(desc);
  83                 DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
  84                     desc->status, desc->ctrl, desc->totalLen,
  85                     desc->dataSize, desc->nextAddr, desc->lastAddr);
  86
  87                 DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
  88                     super->s.cookie, super->s.cnt, super->s.rix,
  89                     super->f.hdr.length, super->f.hdr.mac.set,
  90                     (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
  91                     super->f.data.i3e.frame_control);
  92
  93                 entries++;
  94         }
  95
  96         desc = get_wlan_txq_addr(qidx);
  97
  98         DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
  99             qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
 100             fw.wlan.tx_queue[qidx].head,
 101             desc, fw.wlan.tx_queue[qidx].terminator);
 102
 103         DBG("HW: t:%x s:%x ac:%x c:%x",
 104             (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
 105             (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
 106             (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
 107             (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
 108 }
 109 #endif /* CONFIG_CARL9170FW_DEBUG */
 110
 111 static void wlan_send_buffered_tx_status(void)
 112 {
 113         unsigned int len;
 114
 115         while (fw.wlan.tx_status_pending) {
 116                 len = min((unsigned int)fw.wlan.tx_status_pending,
 117                           CARL9170_RSP_TX_STATUS_NUM);
 118                 len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx);
 119
 120                 /*
 121                  * rather than memcpy each individual request into a large buffer,
 122                  * we _splice_ them all together.
 123                  *
 124                  * The only downside is however that we have to be careful around
 125                  * the edges of the tx_status_cache.
 126                  *
 127                  * Note:
 128                  * Each tx_status is about 2 bytes. However every command package
 129                  * must have a size which is a multiple of 4.
 130                  */
 131
 132                 send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3,
 133                                  CARL9170_RSP_TXCOMP, len, (void *)
 134                                  &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]);
 135
 136                 fw.wlan.tx_status_pending -= len;
 137                 fw.wlan.tx_status_head_idx += len;
 138                 fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM;
 139         }
 140 }
 141
 142 static struct carl9170_tx_status *wlan_get_tx_status_buffer(void)
 143 {
 144         struct carl9170_tx_status *tmp;
 145
 146         tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++];
 147         fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM;
 148
 149         if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM)
 150                 wlan_send_buffered_tx_status();
 151
 152         fw.wlan.tx_status_pending++;
 153
 154         return tmp;
 155 }
 156
 157 /* generate _aggregated_ tx_status for the host */
 158 void wlan_tx_complete(struct carl9170_tx_superframe *super,
 159                       bool txs)
 160 {
 161         struct carl9170_tx_status *status;
 162
 163         status = wlan_get_tx_status_buffer();
 164
 165         /*
 166          * The *unique* cookie and AC_ID is used by the driver for
 167          * frame lookup.
 168          */
 169         status->cookie = super->s.cookie;
 170         status->queue = super->s.queue;
 171         super->s.cookie = 0;
 172
 173         /*
 174          * This field holds the number of tries of the rate in
 175          * the rate index field (rix).
 176          */
 177         status->rix = super->s.rix;
 178         status->tries = super->s.cnt;
 179         status->success = (txs) ? 1 : 0;
 180 }
 181
 182 static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
 183 {
 184         /* check if this was the last possible retry with this rate */
 185         if (unlikely(super->s.cnt >= super->s.ri[super->s.rix].tries)) {
 186                 /* end of the road - indicate tx failure */
 187                 if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
 188                         return false;
 189
 190                 /* check if there are alternative rates available */
 191                 if (!super->s.rr[super->s.rix].set)
 192                         return false;
 193
 194                 /* try next retry rate */
 195                 super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
 196
 197                 /* finally - mark the old rate as USED */
 198                 super->s.rix++;
 199
 200                 /* update MAC flags */
 201                 super->f.hdr.mac.erp_prot = super->s.ri[super->s.rix].erp_prot;
 202                 super->f.hdr.mac.ampdu = super->s.ri[super->s.rix].ampdu;
 203
 204                 /* reinitialize try counter */
 205                 super->s.cnt = 1;
 206         } else {
 207                 /* just increase retry counter */
 208                 super->s.cnt++;
 209         }
 210
 211         return true;
 212 }
 213
 214 static inline u16 get_tid(struct ieee80211_hdr *hdr)
 215 {
 216         return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
 217 }
 218
 219 /* This function will only work on uint32_t-aligned pointers! */
 220 static inline bool compare_ether_address(const void *_d0, const void *_d1)
 221 {
 222         const uint32_t *d0 = _d0;
 223         const uint32_t *d1 = _d1;
 224
 225         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 226         return !((d0[0] ^ d1[0]) | (unsigned short)(d0[1] ^ d1[1]));
 227 }
 228
 229 /* This function will only work on uint32_t-aligned pointers! */
 230 static bool same_hdr(const void *_d0, const void *_d1)
 231 {
 232         const uint32_t *d0 = _d0;
 233         const uint32_t *d1 = _d1;
 234
 235         /* BUG_ON((unsigned long)d0 & 3 || (unsigned long)d1 & 3)) */
 236         return !((d0[0] ^ d1[0]) |                      /* FC + DU */
 237                  (d0[1] ^ d1[1]) |                      /* addr1 */
 238                  (d0[2] ^ d1[2]) | (d0[3] ^ d1[3]) |    /* addr2 + addr3 */
 239                  (d0[4] ^ d1[4]));                      /* addr3 */
 240 }
 241
 242 static inline bool same_aggr(struct ieee80211_hdr *a, struct ieee80211_hdr *b)
 243 {
 244         return (get_tid(a) == get_tid(b)) || same_hdr(a, b);
 245 }
 246
 247 static void wlan_tx_ampdu_end(unsigned int qidx)
 248 {
 249         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 250
 251         fw.wlan.ampdu_prev[qidx] = NULL;
 252         if (ht_prev)
 253                 ht_prev->f.hdr.mac.ba_end = 1;
 254 }
 255
 256 static void wlan_tx_ampdu(struct carl9170_tx_superframe *super)
 257 {
 258         unsigned int qidx = super->s.queue;
 259         struct carl9170_tx_superframe *ht_prev = fw.wlan.ampdu_prev[qidx];
 260
 261         if (!super->f.hdr.mac.ampdu) {
 262                 wlan_tx_ampdu_end(qidx);
 263         } else {
 264                 fw.wlan.ampdu_prev[qidx] = super;
 265
 266                 if (ht_prev &&
 267                     !same_aggr(&super->f.data.i3e, &ht_prev->f.data.i3e))
 268                         ht_prev->f.hdr.mac.ba_end = 1;
 269                 else
 270                         super->f.hdr.mac.ba_end = 0;
 271         }
 272 }
 273
 274 /* for all tries */
 275 static void __wlan_tx(struct dma_desc *desc)
 276 {
 277         struct carl9170_tx_superframe *super = get_super(desc);
 278
 279         if (unlikely(super->s.fill_in_tsf)) {
 280                 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
 281                 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
 282
 283                 /*
 284                  * Truth be told: this is a hack.
 285                  *
 286                  * The *real* TSF is definitely going to be higher/older.
 287                  * But this hardware emulation code is head and shoulders
 288                  * above anything a driver can possibly do.
 289                  *
 290                  * (even, if it's got an accurate atomic clock source).
 291                  */
 292
 293                 read_tsf(tsf);
 294         }
 295
 296         wlan_tx_ampdu(super);
 297
 298 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
 299         wlan_tx_complete(super, true);
 300         unhide_super(desc);
 301 # ifdef CONFIG_CARL9170FW_LOOPBACK
 302         dma_put(&fw.pta.up_queue, desc);
 303         up_trigger();
 304 # elif CONFIG_CARL9170FW_DISCARD
 305         dma_reclaim(&fw.pta.down_queue, desc);
 306         down_trigger();
 307 # endif
 308 #else /* CONFIG_CARL9170FW_LOOPBACK */
 309
 310 # ifdef CONFIG_CARL9170FW_DEBUG
 311         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 312 # endif /* CONFIG_CARL9170FW_DEBUG */
 313
 314         /* insert desc into the right queue */
 315         dma_put(&fw.wlan.tx_queue[super->s.queue], desc);
 316 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 317 }
 318
 319 static void wlan_assign_seq(struct ieee80211_hdr *hdr, unsigned int vif)
 320 {
 321         hdr->seq_ctrl &= cpu_to_le16(~IEEE80211_SCTL_SEQ);
 322         hdr->seq_ctrl |= cpu_to_le16(fw.wlan.sequence[vif]);
 323
 324         if (!(hdr->seq_ctrl & cpu_to_le16(IEEE80211_SCTL_FRAG)))
 325                 fw.wlan.sequence[vif] += 0x10;
 326 }
 327
 328 /* prepares frame for the first transmission */
 329 static void _wlan_tx(struct dma_desc *desc)
 330 {
 331         struct carl9170_tx_superframe *super = get_super(desc);
 332
 333         if (unlikely(super->s.assign_seq))
 334                 wlan_assign_seq(&super->f.data.i3e, super->s.vif_id);
 335
 336         if (unlikely(super->s.ampdu_commit_density)) {
 337                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 338                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 339                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 340                             super->s.ampdu_density));
 341         }
 342
 343         if (unlikely(super->s.ampdu_commit_factor)) {
 344                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 345                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 346                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 347                             8 << super->s.ampdu_factor));
 348         }
 349
 350         __wlan_tx(desc);
 351 }
 352
 353 /* propagate transmission status back to the driver */
 354 static bool wlan_tx_status(struct dma_queue *queue,
 355                            struct dma_desc *desc)
 356 {
 357         struct carl9170_tx_superframe *super = get_super(desc);
 358         unsigned int qidx = super->s.queue;
 359         bool txfail = false, success;
 360
 361         success = true;
 362
 363         /* update hangcheck */
 364         fw.wlan.last_super_num[qidx] = 0;
 365
 366         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 367                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 368
 369                 /* reset retry indicator flags */
 370                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 371
 372                 if (wlan_tx_consume_retry(super)) {
 373                         /*
 374                          * retry for simple and aggregated 802.11 frames.
 375                          *
 376                          * Note: We must not mess up the original frame
 377                          * order.
 378                          */
 379
 380                         if (!super->f.hdr.mac.ampdu) {
 381                                 /*
 382                                  * 802.11 - 7.1.3.1.5.
 383                                  * set "Retry Field" for consecutive attempts
 384                                  *
 385                                  * Note: For AMPDU see:
 386                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 387                                  */
 388                                 super->f.data.i3e.frame_control |=
 389                                         cpu_to_le16(IEEE80211_FCTL_RETRY);
 390                         }
 391
 392                         if (txfail) {
 393                                 /* Normal TX Failure */
 394
 395                                 /* demise descriptor ownership back to the hardware */
 396                                 dma_rearm(desc);
 397
 398                                 /*
 399                                  * And this will get the queue going again.
 400                                  * To understand why: you have to get the HW
 401                                  * specs... But sadly I never saw them.
 402                                  */
 403                                 wlan_txunstuck(qidx);
 404
 405                                 /* abort cycle - this is necessary due to HW design */
 406                                 return false;
 407                         } else {
 408                                 /* (HT-) BlockACK failure */
 409
 410                                 /*
 411                                  * Unlink the failed attempt and put it into
 412                                  * the retry queue. The caller routine must
 413                                  * be aware of this so the frames don't get lost.
 414                                  */
 415
 416                                 dma_unlink_head(queue);
 417                                 dma_put(&fw.wlan.tx_retry, desc);
 418                                 return true;
 419                         }
 420                 } else {
 421                         /* out of frame attempts - discard frame */
 422                         success = false;
 423                 }
 424         }
 425
 426         dma_unlink_head(queue);
 427         if (txfail) {
 428                 /*
 429                  * Issue the queue bump,
 430                  * We need to do this in case this was the frame's last
 431                  * possible retry attempt and it unfortunately: it failed.
 432                  */
 433
 434                 wlan_txunstuck(qidx);
 435         }
 436
 437         unhide_super(desc);
 438
 439         if (unlikely(super == fw.wlan.fw_desc_data)) {
 440                 fw.wlan.fw_desc = desc;
 441                 fw.wlan.fw_desc_available = 1;
 442
 443                 if (fw.wlan.fw_desc_callback)
 444                         fw.wlan.fw_desc_callback(super, success);
 445
 446                 return true;
 447         }
 448
 449 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 450         if (unlikely(super->s.cab))
 451                 fw.wlan.cab_queue_len[super->s.vif_id]--;
 452 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 453
 454         wlan_tx_complete(super, success);
 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 static void wlan_tx_fw(struct carl9170_tx_superdesc *super, fw_desc_callback_t cb)
 506 {
 507         if (!fw.wlan.fw_desc_available)
 508                 return;
 509
 510         fw.wlan.fw_desc_available = 0;
 511
 512         /* Format BlockAck */
 513         fw.wlan.fw_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 514         fw.wlan.fw_desc->status = AR9170_OWN_BITS_SW;
 515
 516         fw.wlan.fw_desc->totalLen = fw.wlan.fw_desc->dataSize = super->len;
 517         fw.wlan.fw_desc_data = fw.wlan.fw_desc->dataAddr = super;
 518         fw.wlan.fw_desc->nextAddr = fw.wlan.fw_desc->lastAddr =
 519                 fw.wlan.fw_desc;
 520         fw.wlan.fw_desc_callback = cb;
 521         wlan_tx(fw.wlan.fw_desc);
 522 }
 523
 524 static void wlan_send_buffered_ba(void)
 525 {
 526         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 527         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 528         struct carl9170_bar_ctx *ctx;
 529
 530         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 531                 return;
 532
 533         /* there's no point to continue when the ba_desc is not available. */
 534         if (!fw.wlan.fw_desc_available)
 535                 return;
 536
 537         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx];
 538         fw.wlan.ba_head_idx++;
 539         fw.wlan.ba_head_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 540
 541         baf->s.len = sizeof(struct carl9170_tx_superdesc) +
 542                      sizeof(struct ar9170_tx_hwdesc) +
 543                      sizeof(struct ieee80211_ba);
 544         baf->s.ri[0].tries = 1;
 545         baf->s.cookie = 0;
 546         baf->s.queue = AR9170_TXQ_VO;
 547         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 548
 549         /* HW Duration / Backoff */
 550         baf->f.hdr.mac.backoff = 1;
 551         baf->f.hdr.mac.hw_duration = 1;
 552
 553         /* take the TX rate from the RX'd BAR */
 554         baf->f.hdr.phy.set = ctx->phy;
 555         baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 556
 557         /* format outgoing BA */
 558         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_NULLFUNC);
 559         ba->duration = cpu_to_le16(0);
 560         memcpy(ba->ta, ctx->ta, 6);
 561         memcpy(ba->ra, ctx->ra, 6);
 562
 563         /*
 564          * Unfortunately, we cannot look into the hardware's scoreboard.
 565          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 566          * and send a null BlockAck.
 567          */
 568         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 569
 570         /*
 571          * NB:
 572          * not entirely sure if this is 100% correct?!
 573          */
 574         ba->control = ctx->control | cpu_to_le16(1);
 575         ba->start_seq_num = ctx->start_seq_num;
 576         wlan_tx_fw(&baf->s, NULL);
 577 }
 578
 579 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 580 {
 581         struct carl9170_bar_ctx *tmp;
 582
 583         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx];
 584         fw.wlan.ba_tail_idx++;
 585         fw.wlan.ba_tail_idx %= CONFIG_CARL9170FW_BACK_REQS_NUM;
 586
 587         return tmp;
 588 }
 589
 590 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 591                        unsigned int len, unsigned int mac_err)
 592 {
 593         struct ieee80211_bar *bar;
 594         struct carl9170_bar_ctx *ctx;
 595
 596         if (unlikely(mac_err)) {
 597                 /*
 598                  * This check does a number of things:
 599                  * 1. checks if the frame is in good nick
 600                  * 2. checks if the RA (MAC) matches
 601                  */
 602                 return ;
 603         }
 604
 605         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 606                 /*
 607                  * Sneaky, corrupted BARs... but not with us!
 608                  */
 609
 610                 return ;
 611         }
 612
 613         bar = (void *) hdr;
 614
 615         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 616             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 617                 /* not implemented yet */
 618
 619                 return ;
 620         }
 621
 622         ctx = wlan_get_bar_cache_buffer();
 623
 624         /* Brilliant! The BAR provides all necessary MACs! */
 625         memcpy(ctx->ra, bar->ta, 6);
 626         memcpy(ctx->ta, bar->ra, 6);
 627
 628         /*
 629          * NB:
 630          * not entirely sure if this is 100% correct to force the
 631          * imm ack bit or not...
 632          */
 633         ctx->control = bar->control | cpu_to_le16(1);
 634         ctx->start_seq_num = bar->start_seq_num;
 635         ctx->phy = ar9170_rx_to_phy(desc);
 636         if (unlikely(!ctx->phy)) {
 637                 /* provide a backup, in case ar9170_rx_to_phy fails */
 638                 ctx->phy = cpu_to_le32(0x2cc301);
 639         }
 640 }
 641
 642 static void wlan_check_rx_overrun(void)
 643 {
 644         uint32_t overruns, total;
 645
 646         fw.tally.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 647         fw.tally.rx_overrun += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 648         if (unlikely(overruns)) {
 649                 if (overruns == total) {
 650                         DBG("RX Overrun");
 651                         fw.wlan.mac_reset++;
 652                 }
 653
 654                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 655         }
 656 }
 657
 658 #ifdef CONFIG_CARL9170FW_WOL
 659 void wlan_prepare_wol(void)
 660 {
 661         /* set MAC filter */
 662         memcpy((void *)AR9170_MAC_REG_MAC_ADDR_L, fw.wlan.wol.cmd.mac, 6);
 663         memcpy((void *)AR9170_MAC_REG_BSSID_L, fw.wlan.wol.cmd.bssid, 6);
 664         set(AR9170_MAC_REG_RX_CONTROL, AR9170_MAC_RX_CTRL_DEAGG);
 665
 666         /* set filter policy to: discard everything */
 667         fw.wlan.rx_filter = CARL9170_RX_FILTER_EVERYTHING;
 668
 669         /* reenable rx dma */
 670         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 671
 672         /* initialize the last_beacon timer */
 673         fw.wlan.wol.last_null = fw.wlan.wol.last_beacon = get_clock_counter();
 674 }
 675
 676 #ifdef CONFIG_CARL9170FW_WOL_NL80211_TRIGGERS
 677 static bool wlan_rx_wol_magic_packet(struct ieee80211_hdr *hdr, unsigned int len)
 678 {
 679         const unsigned char *data, *end, *mac;
 680         unsigned int found = 0;
 681
 682         /*
 683          * LIMITATION:
 684          * We can only scan the first AR9170_BLOCK_SIZE [=~320] bytes
 685          * for MAGIC patterns!
 686          */
 687
 688         mac = (const unsigned char *) AR9170_MAC_REG_MAC_ADDR_L;
 689
 690         data = (u8 *)((unsigned long)hdr + ieee80211_hdrlen(hdr->frame_control));
 691         end = (u8 *)((unsigned long)hdr + len);
 692
 693         /*
 694          * scan for standard WOL Magic frame
 695          *
 696          * "A physical WakeOnLAN (Magic Packet) will look like this:
 697          * ---------------------------------------------------------------
 698          * | Synchronization Stream |  Target MAC |  Password (optional) |
 699          * |    6 octets            |   96 octets |   0, 4 or 6          |
 700          * ---------------------------------------------------------------
 701          *
 702          * The Synchronization Stream is defined as 6 bytes of FFh.
 703          * The Target MAC block contains 16 duplications of the IEEEaddress
 704          * of the target, with no breaks or interruptions.
 705          *
 706          * The Password field is optional, but if present, contains either
 707          * 4 bytes or 6 bytes. The WakeOnLAN dissector was implemented to
 708          * dissect the password, if present, according to the command-line
 709          * format that ether-wake uses, therefore, if a 4-byte password is
 710          * present, it will be dissected as an IPv4 address and if a 6-byte
 711          * password is present, it will be dissected as an Ethernet address.
 712          *
 713          * <http://wiki.wireshark.org/WakeOnLAN>
 714          */
 715
 716         while (data < end) {
 717                 if (found >= 6) {
 718                         if (*data == mac[found % 6])
 719                                 found++;
 720                         else
 721                                 found = 0;
 722                 }
 723
 724                 /* previous check might reset found counter */
 725                 if (found < 6) {
 726                         if (*data == 0xff)
 727                                 found++;
 728                         else
 729                                 found = 0;
 730                 }
 731
 732                 if (found == (6 + 16 * 6))
 733                         return true;
 734
 735                 data++;
 736         }
 737
 738         return false;
 739 }
 740
 741 static void wlan_wol_connect_callback(void __unused *dummy, bool success)
 742 {
 743         if (success)
 744                 fw.wlan.wol.lost_null = 0;
 745         else
 746                 fw.wlan.wol.lost_null++;
 747 }
 748
 749 static void wlan_wol_connection_monitor(void)
 750 {
 751         struct carl9170_tx_null_superframe *nullf = &dma_mem.reserved.cmd.null;
 752         struct ieee80211_hdr *null = (struct ieee80211_hdr *) &nullf->f.null;
 753
 754         if (!fw.wlan.fw_desc_available)
 755                 return;
 756
 757         memset(nullf, 0, sizeof(*nullf));
 758
 759         nullf->s.len = sizeof(struct carl9170_tx_superdesc) +
 760                      sizeof(struct ar9170_tx_hwdesc) +
 761                      sizeof(struct ieee80211_hdr);
 762         nullf->s.ri[0].tries = 3;
 763         nullf->s.assign_seq = true;
 764         nullf->s.queue = AR9170_TXQ_VO;
 765         nullf->f.hdr.length = sizeof(struct ieee80211_hdr) + FCS_LEN;
 766
 767         nullf->f.hdr.mac.backoff = 1;
 768         nullf->f.hdr.mac.hw_duration = 1;
 769         nullf->f.hdr.mac.erp_prot = AR9170_TX_MAC_PROT_RTS;
 770
 771         nullf->f.hdr.phy.modulation = AR9170_TX_PHY_MOD_OFDM;
 772         nullf->f.hdr.phy.bandwidth = AR9170_TX_PHY_BW_20MHZ;
 773         nullf->f.hdr.phy.chains = AR9170_TX_PHY_TXCHAIN_2;
 774         nullf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 775         nullf->f.hdr.phy.mcs = AR9170_TXRX_PHY_RATE_OFDM_6M;
 776
 777         /* format outgoing nullfunc */
 778         null->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
 779                 IEEE80211_STYPE_NULLFUNC | IEEE80211_FCTL_TODS);
 780
 781         memcpy(null->addr1, fw.wlan.wol.cmd.bssid, 6);
 782         memcpy(null->addr2, fw.wlan.wol.cmd.mac, 6);
 783         memcpy(null->addr3, fw.wlan.wol.cmd.bssid, 6);
 784
 785         wlan_tx_fw(&nullf->s, wlan_wol_connect_callback);
 786 }
 787
 788 static bool wlan_rx_wol_disconnect(const unsigned int rx_filter,
 789                                    struct ieee80211_hdr *hdr,
 790                                    unsigned int __unused len)
 791 {
 792         const unsigned char *bssid;
 793         bssid = (const unsigned char *) AR9170_MAC_REG_BSSID_L;
 794
 795         /* should catch both broadcast and unicast MLMEs */
 796         if (!(rx_filter & CARL9170_RX_FILTER_OTHER_RA)) {
 797                 if (ieee80211_is_deauth(hdr->frame_control) ||
 798                     ieee80211_is_disassoc(hdr->frame_control))
 799                         return true;
 800         }
 801
 802         if (ieee80211_is_beacon(hdr->frame_control) &&
 803             compare_ether_address(hdr->addr3, bssid)) {
 804                 fw.wlan.wol.last_beacon = get_clock_counter();
 805         }
 806
 807         return false;
 808 }
 809
 810 #endif /* CARL9170FW_WOL_NL80211_TRIGGERS */
 811
 812 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 813
 814 /*
 815  * Note: CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID is not a real
 816  * string. We have to be careful not to add a \0 at the end.
 817  */
 818 static const struct {
 819         u8 ssid_ie;
 820         u8 ssid_len;
 821         u8 ssid[sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1];
 822 } __packed probe_req = {
 823         .ssid_ie = WLAN_EID_SSID,
 824         .ssid_len = sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1,
 825         .ssid = CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID,
 826 };
 827
 828 static bool wlan_rx_wol_probe_ssid(struct ieee80211_hdr *hdr, unsigned int len)
 829 {
 830         const unsigned char *data, *end, *scan = (void *) &probe_req;
 831
 832         /*
 833          * IEEE 802.11-2007 7.3.2.1 specifies that the SSID is no
 834          * longer than 32 octets.
 835          */
 836         BUILD_BUG_ON((sizeof(CONFIG_CARL9170FW_WOL_PROBE_REQUEST_SSID) - 1) > 32);
 837
 838         if (ieee80211_is_probe_req(hdr->frame_control)) {
 839                 unsigned int i;
 840                 end = (u8 *)((unsigned long)hdr + len);
 841
 842                 /*
 843                  * The position of the SSID information element inside
 844                  * a probe request frame is more or less "fixed".
 845                  */
 846                 data = (u8 *)((struct ieee80211_mgmt *)hdr)->u.probe_req.variable;
 847                 for (i = 0; i < (unsigned int)(probe_req.ssid_len + 1); i++) {
 848                         if (scan[i] != data[i])
 849                                 return false;
 850                 }
 851
 852                 return true;
 853         }
 854
 855         return false;
 856 }
 857 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 858
 859 static void wlan_rx_wol(unsigned int rx_filter __unused, struct ieee80211_hdr *hdr __unused, unsigned int len __unused)
 860 {
 861 #ifdef CONFIG_CARL9170FW_WOL_NL80211_TRIGGERS
 862         /* Disconnect is always enabled */
 863         if (fw.wlan.wol.cmd.flags & CARL9170_WOL_DISCONNECT &&
 864             rx_filter & CARL9170_RX_FILTER_MGMT)
 865                 fw.wlan.wol.wake_up |= wlan_rx_wol_disconnect(rx_filter, hdr, len);
 866
 867         if (fw.wlan.wol.cmd.flags & CARL9170_WOL_MAGIC_PKT &&
 868             rx_filter & CARL9170_RX_FILTER_DATA)
 869                 fw.wlan.wol.wake_up |= wlan_rx_wol_magic_packet(hdr, len);
 870 #endif /* CONFIG_CARL9170FW_WOL_NL80211_TRIGGERS */
 871
 872 #ifdef CONFIG_CARL9170FW_WOL_PROBE_REQUEST
 873         if (rx_filter & CARL9170_RX_FILTER_MGMT)
 874                 fw.wlan.wol.wake_up |= wlan_rx_wol_probe_ssid(hdr, len);
 875 #endif /* CONFIG_CARL9170FW_WOL_PROBE_REQUEST */
 876 }
 877
 878 static void wlan_wol_janitor(void)
 879 {
 880         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 881                 if (fw.wlan.wol.cmd.flags & CARL9170_WOL_DISCONNECT) {
 882                         /*
 883                          * connection lost after 10sec without receiving
 884                          * a beacon
 885                           */
 886                         if (is_after_msecs(fw.wlan.wol.last_beacon, 10000))
 887                                 fw.wlan.wol.wake_up |= true;
 888
 889                         if (fw.wlan.wol.cmd.null_interval &&
 890                             is_after_msecs(fw.wlan.wol.last_null, fw.wlan.wol.cmd.null_interval))
 891                                 wlan_wol_connection_monitor();
 892
 893                         if (fw.wlan.wol.lost_null >= 5)
 894                                 fw.wlan.wol.wake_up |= true;
 895                 }
 896
 897                 if (fw.wlan.wol.wake_up) {
 898                         fw.suspend_mode = CARL9170_AWAKE_HOST;
 899                         set(AR9170_USB_REG_WAKE_UP, AR9170_USB_WAKE_UP_WAKE);
 900                 }
 901         }
 902 }
 903 #endif /* CONFIG_CARL9170FW_WOL */
 904
 905 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 906 {
 907         struct ieee80211_hdr *hdr;
 908         unsigned int data_len;
 909         unsigned int rx_filter;
 910         unsigned int mac_err;
 911
 912         data_len = ar9170_get_rx_mpdu_len(desc);
 913         mac_err = ar9170_get_rx_macstatus_error(desc);
 914
 915 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP)
 916
 917         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 918             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 919             mac_err & AR9170_RX_ERROR_BAD) {
 920                 /*
 921                  * This frame is too damaged to do anything
 922                  * useful with it.
 923                  */
 924
 925                 return CARL9170_RX_FILTER_BAD;
 926         }
 927
 928         rx_filter = 0;
 929         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 930                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 931
 932         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 933                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 934
 935         hdr = ar9170_get_rx_i3e(desc);
 936         if (likely(ieee80211_is_data(hdr->frame_control))) {
 937                 rx_filter |= CARL9170_RX_FILTER_DATA;
 938         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 939                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 940                 case IEEE80211_STYPE_BACK_REQ:
 941                         handle_bar(desc, hdr, data_len, mac_err);
 942                         /* fallthrough */
 943                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 944                         break;
 945                 case IEEE80211_STYPE_PSPOLL:
 946                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 947                         break;
 948                 default:
 949                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 950                         break;
 951                 }
 952         } else {
 953                 /* ieee80211_is_mgmt */
 954                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 955         }
 956
 957 #ifdef CONFIG_CARL9170FW_WOL
 958         if (unlikely(fw.suspend_mode == CARL9170_HOST_SUSPENDED)) {
 959                 wlan_rx_wol(rx_filter, hdr, min(data_len,
 960                                (unsigned int)AR9170_BLOCK_SIZE));
 961         }
 962 #endif /* CONFIG_CARL9170FW_WOL */
 963
 964 #undef AR9170_RX_ERROR_BAD
 965
 966         return rx_filter;
 967 }
 968
 969 static void handle_rx(void)
 970 {
 971         struct dma_desc *desc;
 972
 973         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 974                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 975                         dma_put(&fw.pta.up_queue, desc);
 976                         up_trigger();
 977                 } else {
 978                         dma_reclaim(&fw.wlan.rx_queue, desc);
 979                         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 980                 }
 981         }
 982 }
 983
 984 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 985 void wlan_cab_flush_queue(const unsigned int vif)
 986 {
 987         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 988         struct dma_desc *desc;
 989
 990         /* move queued frames into the main tx queues */
 991         for_each_desc(desc, cab_queue) {
 992                 struct carl9170_tx_superframe *super = get_super(desc);
 993                 if (!queue_empty(cab_queue)) {
 994                         /*
 995                          * Set MOREDATA flag for all,
 996                          * but the last queued frame.
 997                          * see: 802.11-2007 11.2.1.5 f)
 998                          *
 999                          * This is actually the reason to why
1000                          * we need to prevent the reentry.
1001                          */
1002
1003                         super->f.data.i3e.frame_control |=
1004                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1005                 } else {
1006                         super->f.data.i3e.frame_control &=
1007                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1008                 }
1009
1010                 /* ready to roll! */
1011                 _wlan_tx(desc);
1012                 wlan_trigger(BIT(super->s.queue));
1013         }
1014 }
1015
1016 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
1017                                const unsigned int len)
1018 {
1019         struct ieee80211_mgmt *mgmt = addr;
1020         uint8_t *pos, *end;
1021
1022         pos = mgmt->u.beacon.variable;
1023         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
1024         while (pos < end) {
1025                 if (pos + 2 + pos[1] > end)
1026                         return NULL;
1027
1028                 if (pos[0] == ie)
1029                         return pos;
1030
1031                 pos += pos[1] + 2;
1032         }
1033
1034         return NULL;
1035 }
1036
1037 void wlan_modify_beacon(const unsigned int vif,
1038         const unsigned int addr, const unsigned int len)
1039 {
1040         uint8_t *_ie;
1041         struct ieee80211_tim_ie *ie;
1042
1043         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
1044         if (likely(_ie)) {
1045                 ie = (struct ieee80211_tim_ie *) &_ie[2];
1046
1047                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
1048                         /* schedule DTIM transfer */
1049                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
1050                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
1051                         /* undo all chances to the beacon structure */
1052                         ie->bitmap_ctrl &= ~0x1;
1053                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
1054                 }
1055
1056                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
1057                 if (fw.wlan.cab_flush_trigger[vif]) {
1058                         /* Set the almighty Multicast Traffic Indication Bit. */
1059                         ie->bitmap_ctrl |= 0x1;
1060                 }
1061         }
1062
1063         /*
1064          * Ideally, the sequence number should be assigned by the TX arbiter
1065          * hardware. But AFAIK that's not possible, so we have to go for the
1066          * next best thing and write it into the beacon fifo during the open
1067          * beacon update window.
1068          */
1069
1070         wlan_assign_seq((struct ieee80211_hdr *)addr, vif);
1071 }
1072
1073 static void wlan_send_buffered_cab(void)
1074 {
1075         unsigned int i;
1076
1077         for (i = 0; i < CARL9170_INTF_NUM; i++) {
1078                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
1079                         /*
1080                          * This is hardcoded into carl9170usb driver.
1081                          *
1082                          * The driver must set the PRETBTT event to beacon_interval -
1083                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
1084                          *
1085                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
1086                          * 11.2.1.6. Let's hope the current solution is adequate enough.
1087                          */
1088
1089                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
1090                                 wlan_cab_flush_queue(i);
1091
1092                                 /*
1093                                  * This prevents the code from sending new BC/MC frames
1094                                  * which were queued after the previous buffered traffic
1095                                  * has been sent out... They will have to wait until the
1096                                  * next DTIM beacon comes along.
1097                                  */
1098                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
1099                         }
1100                 }
1101
1102         }
1103 }
1104 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
1105
1106 static void handle_beacon_config(void)
1107 {
1108         uint32_t bcn_count;
1109
1110         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
1111         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
1112                          (uint8_t *) &bcn_count);
1113 }
1114
1115 static void handle_pretbtt(void)
1116 {
1117 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
1118         fw.wlan.cab_flush_time = get_clock_counter();
1119 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
1120
1121 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1122         rf_psm();
1123
1124         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
1125                          (uint8_t *) &fw.phy.psm.state);
1126 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1127 }
1128
1129 static void handle_atim(void)
1130 {
1131         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
1132 }
1133
1134 #ifdef CONFIG_CARL9170FW_DEBUG
1135 static void handle_qos(void)
1136 {
1137         /*
1138          * What is the QoS Bit used for?
1139          * Is it only an indicator for TXOP & Burst, or
1140          * should we do something here?
1141          */
1142 }
1143
1144 static void handle_radar(void)
1145 {
1146         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
1147 }
1148 #endif /* CONFIG_CARL9170FW_DEBUG */
1149
1150 static void wlan_janitor(void)
1151 {
1152 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
1153         wlan_send_buffered_cab();
1154 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
1155
1156         wlan_send_buffered_tx_status();
1157
1158         wlan_send_buffered_ba();
1159
1160 #ifdef CONFIG_CARL9170FW_WOL
1161         wlan_wol_janitor();
1162 #endif /* CONFIG_CARL9170FW_WOL */
1163 }
1164
1165 void handle_wlan(void)
1166 {
1167         uint32_t intr;
1168
1169         intr = get(AR9170_MAC_REG_INT_CTRL);
1170         /* ACK Interrupt */
1171         set(AR9170_MAC_REG_INT_CTRL, intr);
1172
1173 #define HANDLER(intr, flag, func)                       \
1174         do {                                            \
1175                 if ((intr & flag) != 0) {               \
1176                         func();                         \
1177                 }                                       \
1178         } while (0)
1179
1180         intr |= fw.wlan.soft_int;
1181         fw.wlan.soft_int = 0;
1182
1183         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
1184
1185         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
1186
1187         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
1188
1189         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
1190                 handle_tx_completion);
1191
1192 #ifdef CONFIG_CARL9170FW_DEBUG
1193         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
1194
1195         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
1196 #endif /* CONFIG_CARL9170FW_DEBUG */
1197
1198         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
1199
1200         if (unlikely(intr))
1201                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
1202
1203         wlan_janitor();
1204
1205 #undef HANDLER
1206 }
1207
1208 enum {
1209         CARL9170FW_TX_MAC_BUMP = 4,
1210         CARL9170FW_TX_MAC_DEBUG = 6,
1211         CARL9170FW_TX_MAC_RESET = 7,
1212 };
1213
1214 static void wlan_check_hang(void)
1215 {
1216         struct dma_desc *desc;
1217         int i;
1218
1219         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1220                 if (queue_empty(&fw.wlan.tx_queue[i])) {
1221                         /* Nothing to do here... move along */
1222                         continue;
1223                 }
1224
1225                 /* fetch the current DMA queue position */
1226                 desc = (struct dma_desc *)get_wlan_txq_addr(i);
1227
1228                 /* Stuck frame detection */
1229                 if (unlikely(DESC_PAYLOAD(desc) == fw.wlan.last_super[i])) {
1230                         fw.wlan.last_super_num[i]++;
1231
1232                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET)) {
1233                                 /*
1234                                  * schedule MAC reset (aka OFF/ON => dead)
1235                                  *
1236                                  * This will almost certainly kill
1237                                  * the device for good, but it's the
1238                                  * recommended thing to do...
1239                                  */
1240
1241                                 fw.wlan.mac_reset++;
1242                         }
1243
1244 #ifdef CONFIG_CARL9170FW_DEBUG
1245                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_DEBUG)) {
1246                                 /*
1247                                  * Sigh, the queue is almost certainly
1248                                  * dead. Dump the queue content to the
1249                                  * user, maybe we find out why it got
1250                                  * so stuck.
1251                                  */
1252
1253                                 wlan_dump_queue(i);
1254                         }
1255 #endif /* CONFIG_CARL9170FW_DEBUG */
1256
1257 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
1258                         if (unlikely(fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_BUMP)) {
1259                                 /*
1260                                  * Hrrm, bump the queue a bit.
1261                                  * maybe this will get it going again.
1262                                  */
1263
1264                                 wlan_dma_bump(i);
1265                                 wlan_trigger(BIT(i));
1266                         }
1267 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
1268                 } else {
1269                         /* Nothing stuck */
1270                         fw.wlan.last_super[i] = DESC_PAYLOAD(desc);
1271                         fw.wlan.last_super_num[i] = 0;
1272                 }
1273         }
1274 }
1275
1276 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
1277 /*
1278  * NB: Resetting the MAC is a two-edged sword.
1279  * On most occasions, it does what it is supposed to do.
1280  * But there is a chance that this will make it
1281  * even worse and the radio dies silently.
1282  */
1283 static void wlan_mac_reset(void)
1284 {
1285         uint32_t val;
1286         uint32_t agg_wait_counter;
1287         uint32_t agg_density;
1288         uint32_t bcn_start_addr;
1289         uint32_t rctl, rcth;
1290         uint32_t cam_mode;
1291         uint32_t ack_power;
1292         uint32_t rts_cts_tpc;
1293         uint32_t rts_cts_rate;
1294         int i;
1295
1296 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1297         uint32_t rx_BB;
1298 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1299
1300 #ifdef CONFIG_CARL9170FW_NOISY_MAC_RESET
1301         INFO("MAC RESET");
1302 #endif /* CONFIG_CARL9170FW_NOISY_MAC_RESET */
1303
1304         /* Save aggregation parameters */
1305         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
1306         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
1307
1308         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
1309
1310         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
1311         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
1312         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
1313
1314         ack_power = get(AR9170_MAC_REG_ACK_TPC);
1315         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
1316         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
1317
1318 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1319         /* 0x1c8960 write only */
1320         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
1321 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1322
1323         /* TX/RX must be stopped by now */
1324         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
1325
1326         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
1327
1328         /*
1329          * Manipulate CCA threshold to stop transmission
1330          *
1331          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1332          */
1333
1334         /*
1335          * check Rx state in 0(idle) 9(disable)
1336          *
1337          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1338          * while( (chState != 0) && (chState != 9)) {
1339          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1340          * }
1341          */
1342
1343         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1344
1345         delay(2);
1346
1347         /* Restore aggregation parameters */
1348         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1349         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1350
1351         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1352         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1353         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1354         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1355
1356         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1357         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1358         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1359
1360 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1361         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1362 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1363
1364         /*
1365          * Manipulate CCA threshold to resume transmission
1366          *
1367          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1368          */
1369
1370         val = AR9170_DMA_TRIGGER_RXQ;
1371         /* Reinitialize all WLAN TX DMA queues. */
1372         for (i = AR9170_TXQ_SPECIAL; i >= AR9170_TXQ0; i--) {
1373                 struct dma_desc *iter;
1374
1375                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1376
1377                 /* kill the stuck frame */
1378                 if (!is_terminator(&fw.wlan.tx_queue[i], iter) &&
1379                     fw.wlan.last_super_num[i] >= CARL9170FW_TX_MAC_RESET &&
1380                     fw.wlan.last_super[i] == DESC_PAYLOAD(iter)) {
1381                         struct carl9170_tx_superframe *super = get_super(iter);
1382
1383                         iter->status = AR9170_OWN_BITS_SW;
1384                         /*
1385                          * Mark the frame as failed.
1386                          * The BAFAIL flag allows the frame to sail through
1387                          * wlan_tx_status without much "unstuck" trouble.
1388                          */
1389                         iter->ctrl &= ~(AR9170_CTRL_FAIL);
1390                         iter->ctrl |= AR9170_CTRL_BAFAIL;
1391
1392                         super->s.cnt = CARL9170_TX_MAX_RATE_TRIES;
1393                         super->s.rix = CARL9170_TX_MAX_RETRY_RATES;
1394
1395                         fw.wlan.last_super_num[i] = 0;
1396                         fw.wlan.last_super[i] = NULL;
1397                         iter = iter->lastAddr->nextAddr;
1398                 }
1399
1400                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1401                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1402                         val |= BIT(i);
1403
1404                 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]),
1405                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1406                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1407         }
1408
1409         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1410                             AR9170_MAC_INT_RETRY_FAIL;
1411
1412         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1413         wlan_trigger(val);
1414 }
1415 #else
1416 static void wlan_mac_reset(void)
1417 {
1418         /* The driver takes care of reinitializing the device */
1419         BUG("MAC RESET");
1420 }
1421 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1422
1423 void __cold wlan_timer(void)
1424 {
1425         unsigned int cached_mac_reset;
1426
1427         cached_mac_reset = fw.wlan.mac_reset;
1428
1429         /* TX Queue Hang check */
1430         wlan_check_hang();
1431
1432         /* RX Overrun check */
1433         wlan_check_rx_overrun();
1434
1435         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1436                 wlan_mac_reset();
1437                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1438         } else {
1439                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1440                         fw.wlan.mac_reset--;
1441         }
1442 }