carlfw/src/wlan.c

   1 /*
   2  * carl9170 firmware - used by the ar9170 wireless device
   3  *
   4  * Interface to the WLAN part of the chip
   5  *
   6  * Copyright (c) 2000-2005 ZyDAS Technology Corporation
   7  * Copyright (c) 2007-2009 Atheros Communications, Inc.
   8  * Copyright    2009    Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2009, 2010 Christian Lamparter <chunkeey@googlemail.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "carl9170.h"
  27 #include "shared/phy.h"
  28 #include "hostif.h"
  29 #include "timer.h"
  30 #include "wl.h"
  31 #include "printf.h"
  32 #include "rf.h"
  33 #include "linux/ieee80211.h"
  34
  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         wlan_trigger(BIT(queue));
  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         wlan_trigger(BIT(queue));
  46 }
  47
  48 static void wlan_dma_bump(unsigned int qidx)
  49 {
  50         unsigned int offset = qidx;
  51         uint32_t status, trigger;
  52
  53         status = get(AR9170_MAC_REG_DMA_STATUS) >> 12;
  54         trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12;
  55
  56         while (offset != 0) {
  57                 status >>= 4;
  58                 trigger >>= 4;
  59                 offset--;
  60         }
  61
  62         status &= 0xf;
  63         trigger &= 0xf;
  64
  65         if ((trigger == 0xa) && (status == 0x8)) {
  66                 DBG("UNSTUCK");
  67                 wlan_txunstuck(qidx);
  68         } else {
  69                 DBG("UPDATE");
  70                 wlan_txupdate(qidx);
  71         }
  72 }
  73 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
  74
  75 #ifdef CONFIG_CARL9170FW_DEBUG
  76 static void wlan_dump_queue(unsigned int qidx)
  77 {
  78
  79         struct dma_desc *desc;
  80         struct carl9170_tx_superframe *super;
  81         int entries = 0;
  82
  83         __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
  84                 super = get_super(desc);
  85                 DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
  86                     desc->status, desc->ctrl, desc->totalLen,
  87                     desc->dataSize, desc->nextAddr, desc->lastAddr);
  88
  89                 DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
  90                     super->s.cookie, super->s.cnt, super->s.rix,
  91                     super->f.hdr.length, super->f.hdr.mac.set,
  92                     (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
  93                     super->f.data.i3e.frame_control);
  94
  95                 entries++;
  96         }
  97
  98         desc = get_wlan_txq_addr(qidx);
  99
 100         DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
 101             qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
 102             fw.wlan.tx_queue[qidx].head,
 103             desc, fw.wlan.tx_queue[qidx].terminator);
 104
 105         DBG("HW: t:%x s:%x ac:%x c:%x",
 106             (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
 107             (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
 108             (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
 109             (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
 110 }
 111 #endif /* CONFIG_CARL9170FW_DEBUG */
 112
 113 static void wlan_send_buffered_tx_status(void)
 114 {
 115         unsigned int len;
 116
 117         while (fw.wlan.tx_status_pending) {
 118                 len = min((unsigned int)fw.wlan.tx_status_pending,
 119                           CARL9170_RSP_TX_STATUS_NUM);
 120                 len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx);
 121
 122                 /*
 123                  * rather than memcpy each individual request into a large buffer,
 124                  * we _splice_ them all together.
 125                  *
 126                  * The only downside is however that we have to be careful around
 127                  * the edges of the tx_status_cache.
 128                  *
 129                  * Note:
 130                  * Each tx_status is about 2 bytes. However every command package
 131                  * must have a size which is a multiple of 4.
 132                  */
 133
 134                 send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3,
 135                                  CARL9170_RSP_TXCOMP, len, (void *)
 136                                  &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]);
 137
 138                 fw.wlan.tx_status_pending -= len;
 139                 fw.wlan.tx_status_head_idx += len;
 140                 fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM;
 141         }
 142 }
 143
 144 static struct carl9170_tx_status *wlan_get_tx_status_buffer(void)
 145 {
 146         struct carl9170_tx_status *tmp;
 147
 148         tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++];
 149         fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM;
 150
 151         if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM)
 152                 wlan_send_buffered_tx_status();
 153
 154         fw.wlan.tx_status_pending++;
 155
 156         return tmp;
 157 }
 158
 159 /* generate _aggregated_ tx_status for the host */
 160 static void wlan_tx_complete(struct carl9170_tx_superframe *super,
 161                              bool txs)
 162 {
 163         struct carl9170_tx_status *status;
 164
 165         status = wlan_get_tx_status_buffer();
 166
 167         /*
 168          * The *unique* cookie and AC_ID is used by the driver for
 169          * frame lookup.
 170          */
 171         status->cookie = super->s.cookie;
 172         status->queue = super->s.queue;
 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 /* for all tries */
 216 static void __wlan_tx(struct dma_desc *desc)
 217 {
 218         struct carl9170_tx_superframe *super = get_super(desc);
 219 #ifdef CONFIG_CARL9170FW_NORMAL_TX_RX
 220         unsigned int queue = super->s.queue;
 221 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 222
 223         if (unlikely(super->s.fill_in_tsf)) {
 224                 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
 225                 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
 226
 227                 /*
 228                  * Truth be told: this is a hack.
 229                  *
 230                  * The *real* TSF is definitely going to be higher/older.
 231                  * But this hardware emulation code is head and shoulders
 232                  * above anything a driver can possibly do.
 233                  *
 234                  * (even, if it's got an accurate atomic clock source).
 235                  */
 236
 237                 read_tsf(tsf);
 238         }
 239
 240 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
 241         wlan_tx_complete(super, true);
 242         unhide_super(desc);
 243 # ifdef CONFIG_CARL9170FW_LOOPBACK
 244         dma_put(&fw.pta.up_queue, desc);
 245         up_trigger();
 246 # elif CONFIG_CARL9170FW_DISCARD
 247         dma_reclaim(&fw.pta.down_queue, desc);
 248         down_trigger();
 249 # endif
 250 #else /* CONFIG_CARL9170FW_LOOPBACK */
 251
 252 # if ((defined CONFIG_CARL9170FW_DEBUG) && (defined CONFIG_CARL9170FW_PSM))
 253         BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
 254 # endif /* CONFIG_CARL9170FW_DEBUG && CONFIG_CARL9170FW_PSM */
 255
 256         /* insert desc into the right queue */
 257         dma_put(&fw.wlan.tx_queue[queue], desc);
 258         wlan_trigger(BIT(queue));
 259 #endif /* CONFIG_CARL9170FW_LOOPBACK */
 260 }
 261
 262 /* prepares frame for the first transmission */
 263 static void _wlan_tx(struct dma_desc *desc)
 264 {
 265         struct carl9170_tx_superframe *super = get_super(desc);
 266
 267         if (unlikely(super->s.ampdu_commit_density)) {
 268                 set(AR9170_MAC_REG_AMPDU_DENSITY,
 269                     MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
 270                             get(AR9170_MAC_REG_AMPDU_DENSITY),
 271                             super->s.ampdu_density));
 272         }
 273
 274         if (unlikely(super->s.ampdu_commit_factor)) {
 275                 set(AR9170_MAC_REG_AMPDU_FACTOR,
 276                     MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
 277                             get(AR9170_MAC_REG_AMPDU_FACTOR),
 278                             8 << super->s.ampdu_factor));
 279         }
 280
 281         __wlan_tx(desc);
 282 }
 283
 284 /* propagate transmission status back to the driver */
 285 static bool wlan_tx_status(struct dma_queue *queue,
 286                            struct dma_desc *desc)
 287 {
 288         struct ar9170_tx_frame *frame = DESC_PAYLOAD(desc);
 289         struct carl9170_tx_superframe *super = get_super(desc);
 290         struct ieee80211_hdr *hdr = &super->f.data.i3e;
 291         unsigned int qidx = super->s.queue;
 292         bool txfail, success;
 293
 294         success = true;
 295
 296         /* update hangcheck */
 297         fw.wlan.last_tx_desc_num[qidx] = 0;
 298
 299         if (!!(desc->ctrl & AR9170_CTRL_FAIL)) {
 300                 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
 301
 302                 /* reset retry indicator flags */
 303                 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
 304
 305                 if (wlan_tx_consume_retry(super)) {
 306                         /*
 307                          * retry for simple and aggregated 802.11 frames.
 308                          *
 309                          * Note: We must not mess up the original frame
 310                          * order.
 311                          */
 312
 313                         if (!frame->hdr.mac.ampdu) {
 314                                 /*
 315                                  * 802.11 - 7.1.3.1.5.
 316                                  * set "Retry Field" for consecutive attempts
 317                                  *
 318                                  * Note: For AMPDU see:
 319                                  * 802.11n 9.9.1.6 "Retransmit Procedures"
 320                                  */
 321
 322                                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
 323                         }
 324
 325                         if (txfail) {
 326                                 /* Normal TX Failure */
 327
 328                                 /* demise descriptor ownership back to the hardware */
 329                                 dma_rearm(desc);
 330
 331                                 /*
 332                                  * And this will get the queue going again.
 333                                  * To understand why: you have to get the HW
 334                                  * specs... But sadly I never saw them.
 335                                  */
 336                                 wlan_txunstuck(qidx);
 337
 338                                 /* abort cycle - this is necessary due to HW design */
 339                                 return false;
 340                         } else {
 341                                 /* (HT-) BlockACK failure */
 342
 343                                 /*
 344                                  * Unlink the failed attempt and put it into
 345                                  * the retry queue. The caller routine must
 346                                  * be aware of this so the frames don't get lost.
 347                                  */
 348
 349                                 dma_unlink_head(queue);
 350 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 351                                 dma_put(&fw.wlan.tx_retry, desc);
 352 #else
 353                                 __wlan_tx(desc);
 354 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 355                                 return true;
 356                         }
 357                 } else {
 358                         /* out of frame attempts - discard frame */
 359                         success = false;
 360                 }
 361         }
 362
 363         dma_unlink_head(queue);
 364         if (txfail) {
 365                 /*
 366                  * Issue the queue bump,
 367                  * We need to do this in case this was the frame's last
 368                  * possible retry attempt and it unfortunately: it failed.
 369                  */
 370
 371                 wlan_txunstuck(qidx);
 372         }
 373
 374         unhide_super(desc);
 375
 376 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 377         if (unlikely(super == (void *) &dma_mem.reserved.ba)) {
 378                 fw.wlan.ba_desc = desc;
 379                 fw.wlan.ba_desc_available = 1;
 380                 return true;
 381         }
 382 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 383
 384         wlan_tx_complete(super, success);
 385
 386 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 387         if (unlikely(super->s.cab))
 388                 fw.wlan.cab_queue_len[super->s.vif_id]--;
 389 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 390
 391         /* recycle freed descriptors */
 392         dma_reclaim(&fw.pta.down_queue, desc);
 393         down_trigger();
 394         return true;
 395 }
 396
 397 static void handle_tx_completion(void)
 398 {
 399         struct dma_desc *desc;
 400         unsigned int i;
 401
 402         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
 403                 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
 404                         if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
 405                                 /* termination requested. */
 406                                 break;
 407                         }
 408                 }
 409
 410 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 411                 for_each_desc(desc, &fw.wlan.tx_retry)
 412                         __wlan_tx(desc);
 413
 414                 for_each_desc(desc, &fw.wlan.tx_delay[i])
 415                         _wlan_tx(desc);
 416 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 417         }
 418 }
 419
 420 void __hot wlan_tx(struct dma_desc *desc)
 421 {
 422         struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
 423
 424         /* initialize rate control struct */
 425         super->s.rix = 0;
 426         super->s.cnt = 1;
 427         hide_super(desc);
 428
 429 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 430         if (!queue_empty(&fw.wlan.tx_queue[super->s.queue])) {
 431                 dma_put(&fw.wlan.tx_delay[super->s.queue], desc);
 432                 return;
 433         }
 434 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 435
 436 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 437         if (unlikely(super->s.cab)) {
 438                 fw.wlan.cab_queue_len[super->s.vif_id]++;
 439                 dma_put(&fw.wlan.cab_queue[super->s.vif_id], desc);
 440                 return;
 441         }
 442 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 443
 444         _wlan_tx(desc);
 445 }
 446
 447 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 448 static void wlan_send_buffered_ba(void)
 449 {
 450         struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
 451         struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
 452         struct carl9170_bar_ctx *ctx;
 453
 454         if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
 455                 return;
 456
 457         /* there's no point to continue when the ba_desc is not available. */
 458         if (!fw.wlan.ba_desc_available)
 459                 return;
 460
 461         ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 462         fw.wlan.ba_head_idx++;
 463
 464         /* Format BlockAck */
 465         fw.wlan.ba_desc->status = 0;
 466         fw.wlan.ba_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
 467         fw.wlan.ba_desc_available = 0;
 468         fw.wlan.ba_desc->nextAddr = fw.wlan.ba_desc->lastAddr =
 469                 fw.wlan.ba_desc;
 470
 471         baf->s.len = fw.wlan.ba_desc->totalLen = fw.wlan.ba_desc->dataSize =
 472                 sizeof(struct carl9170_tx_superdesc) +
 473                 sizeof(struct ar9170_tx_hwdesc) +
 474                 sizeof(struct ieee80211_ba);
 475
 476         baf->s.ri[0].tries = 3;
 477         baf->s.queue = 0;
 478         baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
 479
 480         /* HW Duration / Backoff */
 481         baf->f.hdr.mac.backoff = 1;
 482         baf->f.hdr.mac.hw_duration = 1;
 483
 484         /* take the TX rate from the RX'd BAR */
 485         baf->f.hdr.phy.set = ctx->phy;
 486         baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
 487
 488         /* format outgoing BA */
 489         ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
 490         ba->duration = cpu_to_le16(0);
 491         memcpy(ba->ta, ctx->ta, 6);
 492         memcpy(ba->ra, ctx->ra, 6);
 493
 494         /*
 495          * Unfortunately, we cannot look into the hardware's scoreboard.
 496          * Therefore we have to proceed as described in 802.11n 9.10.7.5
 497          * and send a null BlockAck.
 498          */
 499         memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
 500
 501         /*
 502          * NB:
 503          * not entirely sure if this is 100% correct?!
 504          */
 505         ba->control = ctx->control | cpu_to_le16(1);
 506         ba->start_seq_num = ctx->start_seq_num;
 507
 508         wlan_tx(fw.wlan.ba_desc);
 509 }
 510
 511 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
 512 {
 513         struct carl9170_bar_ctx *tmp;
 514
 515         /* expire oldest entry, if we ran out of ba_ctx' */
 516         if (fw.wlan.ba_head_idx + CONFIG_CARL9170FW_BACK_REQS_NUM < fw.wlan.ba_tail_idx)
 517                 fw.wlan.ba_head_idx++;
 518
 519         tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
 520         fw.wlan.ba_tail_idx++;
 521
 522         return tmp;
 523 }
 524
 525 static void handle_bar(struct dma_desc *desc, struct ieee80211_hdr *hdr,
 526                        unsigned int len, unsigned int mac_err)
 527 {
 528         struct ieee80211_bar *bar;
 529         struct carl9170_bar_ctx *ctx;
 530
 531         if (unlikely(mac_err)) {
 532                 /*
 533                  * This check does a number of things:
 534                  * 1. checks if the frame is in good nick
 535                  * 2. checks if the RA (MAC) matches
 536                  */
 537                 return ;
 538         }
 539
 540         if (unlikely(len < (sizeof(struct ieee80211_bar) + FCS_LEN))) {
 541                 /*
 542                  * Sneaky, corrupted BARs... but not with us!
 543                  */
 544
 545                 return ;
 546         }
 547
 548         bar = (void *) hdr;
 549
 550         if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
 551             !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
 552                 /* not implemented yet */
 553
 554                 return ;
 555         }
 556
 557         ctx = wlan_get_bar_cache_buffer();
 558
 559         /* Brilliant! The BAR provides all necessary MACs! */
 560         memcpy(ctx->ra, bar->ta, 6);
 561         memcpy(ctx->ta, bar->ra, 6);
 562
 563         /*
 564          * NB:
 565          * not entirely sure if this is 100% correct to force the
 566          * imm ack bit or not...
 567          */
 568         ctx->control = bar->control | cpu_to_le16(1);
 569         ctx->start_seq_num = bar->start_seq_num;
 570         ctx->phy = ar9170_rx_to_phy(desc);
 571         if (unlikely(!ctx->phy)) {
 572                 /* provide a backup, in case ar9170_rx_to_phy fails */
 573                 ctx->phy = cpu_to_le32(0x2cc301);
 574         }
 575 }
 576 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 577
 578 static void wlan_check_rx_overrun(void)
 579 {
 580         uint32_t overruns, total;
 581
 582         fw.wlan.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
 583         fw.wlan.rx_overruns += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
 584         if (unlikely(overruns)) {
 585                 if (overruns == total) {
 586                         DBG("RX Overrun");
 587                         fw.wlan.mac_reset++;
 588                 }
 589
 590                 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 591         }
 592 }
 593
 594 static unsigned int wlan_rx_filter(struct dma_desc *desc)
 595 {
 596         struct ieee80211_hdr *hdr;
 597         unsigned int data_len;
 598         unsigned int rx_filter;
 599         unsigned int mac_err;
 600
 601         data_len = ar9170_get_rx_mpdu_len(desc);
 602         mac_err = ar9170_get_rx_macstatus_error(desc);
 603
 604 #define AR9170_RX_ERROR_BAD (AR9170_RX_ERROR_FCS | AR9170_RX_ERROR_PLCP | \
 605                              AR9170_RX_ERROR_FATAL)
 606
 607         if (unlikely(data_len < (4 + 6 + FCS_LEN) ||
 608             desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN) ||
 609             mac_err & AR9170_RX_ERROR_BAD) {
 610
 611                 /*
 612                  * This frame is too damaged to do anything
 613                  * useful with it.
 614                  */
 615
 616                 return CARL9170_RX_FILTER_BAD;
 617         }
 618
 619         rx_filter = 0;
 620         if (mac_err & AR9170_RX_ERROR_WRONG_RA)
 621                 rx_filter |= CARL9170_RX_FILTER_OTHER_RA;
 622
 623         if (mac_err & AR9170_RX_ERROR_DECRYPT)
 624                 rx_filter |= CARL9170_RX_FILTER_DECRY_FAIL;
 625
 626         hdr = ar9170_get_rx_i3e(desc);
 627         if (likely(ieee80211_is_data(hdr->frame_control))) {
 628                 rx_filter |= CARL9170_RX_FILTER_DATA;
 629         } else if (ieee80211_is_ctl(hdr->frame_control)) {
 630                 switch (le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE) {
 631                 case IEEE80211_STYPE_BACK_REQ:
 632 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 633                         handle_bar(desc, hdr, data_len, mac_err);
 634 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 635                         /* fallthrough */
 636                         rx_filter |= CARL9170_RX_FILTER_CTL_BACKR;
 637                         break;
 638                 case IEEE80211_STYPE_PSPOLL:
 639                         rx_filter |= CARL9170_RX_FILTER_CTL_PSPOLL;
 640                         break;
 641                 default:
 642                         rx_filter |= CARL9170_RX_FILTER_CTL_OTHER;
 643                         break;
 644                 }
 645         } else {
 646                 /* ieee80211_is_mgmt */
 647                 rx_filter |= CARL9170_RX_FILTER_MGMT;
 648         }
 649
 650 #undef AR9170_RX_ERROR_BAD
 651
 652         return rx_filter;
 653 }
 654
 655 static void handle_rx(void)
 656 {
 657         struct dma_desc *desc;
 658
 659         for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
 660                 if (!(wlan_rx_filter(desc) & fw.wlan.rx_filter)) {
 661                         dma_put(&fw.pta.up_queue, desc);
 662                         up_trigger();
 663                 } else {
 664                         dma_reclaim(&fw.wlan.rx_queue, desc);
 665                         _wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
 666                 }
 667         }
 668 }
 669
 670 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 671 void wlan_cab_flush_queue(const unsigned int vif)
 672 {
 673         struct dma_queue *cab_queue = &fw.wlan.cab_queue[vif];
 674         struct dma_desc *desc;
 675
 676         /* move queued frames into the main tx queues */
 677         for_each_desc(desc, cab_queue) {
 678                 struct carl9170_tx_superframe *super = get_super(desc);
 679                 if (!queue_empty(cab_queue)) {
 680                         /*
 681                          * Set MOREDATA flag for all,
 682                          * but the last queued frame.
 683                          * see: 802.11-2007 11.2.1.5 f)
 684                          *
 685                          * This is actually the reason to why
 686                          * we need to prevent the reentry.
 687                          */
 688
 689                         super->f.data.i3e.frame_control |=
 690                                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 691                 } else {
 692                         super->f.data.i3e.frame_control &=
 693                                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 694                 }
 695
 696                 /* ready to roll! */
 697                 _wlan_tx(desc);
 698         }
 699 }
 700
 701 static uint8_t *beacon_find_ie(uint8_t ie, void *addr,
 702                                const unsigned int len)
 703 {
 704         struct ieee80211_mgmt *mgmt = addr;
 705         uint8_t *pos, *end;
 706
 707         pos = mgmt->u.beacon.variable;
 708         end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
 709         while (pos < end) {
 710                 if (pos + 2 + pos[1] > end)
 711                         return NULL;
 712
 713                 if (pos[0] == ie)
 714                         return pos;
 715
 716                 pos += pos[1] + 2;
 717         }
 718
 719         return NULL;
 720 }
 721
 722 void wlan_cab_modify_dtim_beacon(const unsigned int vif,
 723         const unsigned int addr, const unsigned int len)
 724 {
 725         uint8_t *_ie;
 726         struct ieee80211_tim_ie *ie;
 727
 728         _ie = beacon_find_ie(WLAN_EID_TIM, (void *)addr, len);
 729         if (likely(_ie)) {
 730                 ie = (struct ieee80211_tim_ie *) &_ie[2];
 731
 732                 if (!queue_empty(&fw.wlan.cab_queue[vif]) && (ie->dtim_count == 0)) {
 733                         /* schedule DTIM transfer */
 734                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_ARMED;
 735                 } else if ((fw.wlan.cab_queue_len[vif] == 0) && (fw.wlan.cab_flush_trigger[vif])) {
 736                         /* undo all chances to the beacon structure */
 737                         ie->bitmap_ctrl &= ~0x1;
 738                         fw.wlan.cab_flush_trigger[vif] = CARL9170_CAB_TRIGGER_EMPTY;
 739                 }
 740
 741                 /* Triggered by CARL9170_CAB_TRIGGER_ARMED || CARL9170_CAB_TRIGGER_DEFER */
 742                 if (fw.wlan.cab_flush_trigger[vif]) {
 743                         /* Set the almighty Multicast Traffic Indication Bit. */
 744                         ie->bitmap_ctrl |= 0x1;
 745                 }
 746         }
 747 }
 748 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 749
 750 static void handle_beacon_config(void)
 751 {
 752         uint32_t bcn_count;
 753
 754         bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
 755         send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
 756                          (uint8_t *) &bcn_count);
 757
 758         set(AR9170_MAC_REG_BCN_CTRL, AR9170_BCN_CTRL_READY);
 759 }
 760
 761 static void handle_pretbtt(void)
 762 {
 763 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 764         fw.wlan.cab_flush_time = get_clock_counter();
 765 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 766
 767 #ifdef CONFIG_CARL9170FW_PSM
 768         rf_psm();
 769
 770         send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
 771                          (uint8_t *) &fw.phy.psm.state);
 772 #else
 773         send_cmd_to_host(0, CARL9170_RSP_PRETBTT, 0x00, NULL);
 774 #endif /* CONFIG_CARL9170FW_PSM */
 775 }
 776
 777 static void handle_atim(void)
 778 {
 779         send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
 780 }
 781
 782 #ifdef CONFIG_CARL9170FW_DEBUG
 783 static void handle_qos(void)
 784 {
 785         /*
 786          * What is the QoS Bit used for?
 787          * Is it only an indicator for TXOP & Burst, or
 788          * should we do something here?
 789          */
 790 }
 791
 792 static void handle_radar(void)
 793 {
 794         send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
 795 }
 796 #endif /* CONFIG_CARL9170FW_DEBUG */
 797
 798 static void wlan_janitor(void)
 799 {
 800 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
 801         unsigned int i;
 802
 803         for (i = 0; i < CARL9170_INTF_NUM; i++) {
 804                 if (unlikely(fw.wlan.cab_flush_trigger[i] == CARL9170_CAB_TRIGGER_ARMED)) {
 805                         /*
 806                          * This is hardcoded into carl9170usb driver.
 807                          *
 808                          * The driver must set the PRETBTT event to beacon_interval -
 809                          * CARL9170_PRETBTT_KUS (usually 6) Kus.
 810                          *
 811                          * But still, we can only do so much about 802.11-2007 9.3.2.1 &
 812                          * 11.2.1.6. Let's hope the current solution is adequate enough.
 813                          */
 814
 815                         if (is_after_msecs(fw.wlan.cab_flush_time, (CARL9170_TBTT_DELTA))) {
 816                                 wlan_cab_flush_queue(i);
 817
 818                                 /*
 819                                  * This prevents the code from sending new BC/MC frames
 820                                  * which were queued after the previous buffered traffic
 821                                  * has been sent out... They will have to wait until the
 822                                  * next DTIM beacon comes along.
 823                                  */
 824                                 fw.wlan.cab_flush_trigger[i] = CARL9170_CAB_TRIGGER_DEFER;
 825                         }
 826                 }
 827
 828         }
 829 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
 830
 831 #ifdef CONFIG_CARL9170FW_DELAYED_TX
 832         if (fw.wlan.tx_trigger) {
 833                 _wlan_trigger(fw.wlan.tx_trigger);
 834                 fw.wlan.tx_trigger = 0;
 835         }
 836 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
 837
 838         wlan_send_buffered_tx_status();
 839
 840 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
 841         wlan_send_buffered_ba();
 842 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
 843 }
 844
 845 void handle_wlan(void)
 846 {
 847         uint32_t intr;
 848
 849         intr = get(AR9170_MAC_REG_INT_CTRL);
 850         /* ACK Interrupt */
 851         set(AR9170_MAC_REG_INT_CTRL, intr);
 852
 853 #define HANDLER(intr, flag, func)                       \
 854         do {                                            \
 855                 if ((intr & flag) != 0) {               \
 856                         func();                         \
 857                 }                                       \
 858         } while (0)
 859
 860         intr |= fw.wlan.soft_int;
 861         fw.wlan.soft_int = 0;
 862
 863         HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
 864
 865         HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
 866
 867         HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
 868
 869         HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
 870                 handle_tx_completion);
 871
 872 #ifdef CONFIG_CARL9170FW_DEBUG
 873         HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
 874
 875         HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
 876 #endif /* CONFIG_CARL9170FW_DEBUG */
 877
 878         HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
 879
 880         if (unlikely(intr))
 881                 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
 882
 883         wlan_janitor();
 884
 885 #undef HANDLER
 886 }
 887
 888 static void wlan_check_hang(void)
 889 {
 890         struct dma_desc *desc;
 891         unsigned int i;
 892
 893         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
 894                 if (queue_empty(&fw.wlan.tx_queue[i])) {
 895                         /* Nothing to do here... move along */
 896                         continue;
 897                 }
 898
 899                 /* fetch the current DMA queue position */
 900                 desc = get_wlan_txq_addr(i);
 901
 902                 /* Stuck frame detection */
 903                 if (unlikely(desc == fw.wlan.last_tx_desc[i])) {
 904                         fw.wlan.last_tx_desc_num[i]++;
 905
 906                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 6)) {
 907                                 /*
 908                                  * schedule MAC reset (aka OFF/ON => dead)
 909                                  *
 910                                  * This will almost certainly kill
 911                                  * the device for good, but it's the
 912                                  * recommended thing to do...
 913                                  */
 914
 915                                 fw.wlan.mac_reset++;
 916                         }
 917
 918 #ifdef CONFIG_CARL9170FW_DEBUG
 919                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 5)) {
 920                                 /*
 921                                  * Sigh, the queue is almost certainly
 922                                  * dead. Dump the queue content to the
 923                                  * user, maybe we find out why it got
 924                                  * so stuck.
 925                                  */
 926
 927                                 wlan_dump_queue(i);
 928                         }
 929 #endif /* CONFIG_CARL9170FW_DEBUG */
 930
 931 #ifdef CONFIG_CARL9170FW_DMA_QUEUE_BUMP
 932                         if (unlikely(fw.wlan.last_tx_desc_num[i] > 3)) {
 933                                 /*
 934                                  * Hrrm, bump the queue a bit.
 935                                  * maybe this will get it going again.
 936                                  */
 937
 938                                 wlan_dma_bump(i);
 939                         }
 940 #endif /* CONFIG_CARL9170FW_DMA_QUEUE_BUMP */
 941                 } else {
 942                         /* Nothing stuck */
 943                         fw.wlan.last_tx_desc[i] = desc;
 944                         fw.wlan.last_tx_desc_num[i] = 0;
 945                 }
 946         }
 947 }
 948
 949 #ifdef CONFIG_CARL9170FW_FW_MAC_RESET
 950 /*
 951  * NB: Resetting the MAC is a two-edged sword.
 952  * On most occasions, it does what it is supposed to do.
 953  * But there is a chance that this will make it
 954  * even worse and the radio dies silently.
 955  */
 956 static void wlan_mac_reset(void)
 957 {
 958         uint32_t val;
 959         uint32_t agg_wait_counter;
 960         uint32_t agg_density;
 961         uint32_t bcn_start_addr;
 962         uint32_t rctl, rcth;
 963         uint32_t cam_mode;
 964         uint32_t ack_power;
 965         uint32_t rts_cts_tpc;
 966         uint32_t rts_cts_rate;
 967         unsigned int i;
 968
 969 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 970         uint32_t rx_BB;
 971 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 972
 973         INFO("MAC RESET");
 974
 975         /* Save aggregation parameters */
 976         agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
 977         agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
 978
 979         bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
 980
 981         cam_mode = get(AR9170_MAC_REG_CAM_MODE);
 982         rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
 983         rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
 984
 985         ack_power = get(AR9170_MAC_REG_ACK_TPC);
 986         rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
 987         rts_cts_rate = get(AR9170_MAC_REG_RTS_CTS_RATE);
 988
 989 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
 990         /* 0x1c8960 write only */
 991         rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
 992 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
 993
 994         /* TX/RX must be stopped by now */
 995         val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
 996
 997         val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
 998
 999         /*
1000          * Manipulate CCA threshold to stop transmission
1001          *
1002          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
1003          */
1004
1005         /*
1006          * check Rx state in 0(idle) 9(disable)
1007          *
1008          * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1009          * while( (chState != 0) && (chState != 9)) {
1010          *      chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
1011          * }
1012          */
1013
1014         set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
1015
1016         delay(2);
1017
1018         /* Restore aggregation parameters */
1019         set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
1020         set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
1021
1022         set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
1023         set(AR9170_MAC_REG_CAM_MODE, cam_mode);
1024         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
1025         set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
1026
1027         set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
1028         set(AR9170_MAC_REG_ACK_TPC, ack_power);
1029         set(AR9170_MAC_REG_RTS_CTS_RATE, rts_cts_rate);
1030
1031 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
1032         set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
1033 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
1034
1035         /*
1036          * Manipulate CCA threshold to resume transmission
1037          *
1038          * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1039          */
1040
1041         /* Reinitialize all WLAN TX DMA queues. */
1042         for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1043                 struct dma_desc *iter;
1044
1045                 __for_each_desc_bits(iter, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW);
1046
1047                 set_wlan_txq_dma_addr(i, (uint32_t) iter);
1048                 if (!is_terminator(&fw.wlan.tx_queue[i], iter))
1049                         wlan_trigger(BIT(i));
1050
1051                 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]),
1052                      fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator,
1053                      get_wlan_txq_addr(i), iter, iter->ctrl, iter->status);
1054         }
1055
1056         fw.wlan.soft_int |= AR9170_MAC_INT_RXC | AR9170_MAC_INT_TXC |
1057                             AR9170_MAC_INT_RETRY_FAIL;
1058
1059         set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1060         wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
1061 }
1062 #else
1063 static void wlan_mac_reset(void)
1064 {
1065         /* The driver takes care of reinitializing the device */
1066         BUG("MAC RESET");
1067 }
1068 #endif /* CONFIG_CARL9170FW_FW_MAC_RESET */
1069
1070 void __cold wlan_timer(void)
1071 {
1072         unsigned int cached_mac_reset;
1073
1074         cached_mac_reset = fw.wlan.mac_reset;
1075
1076         /* TX Queue Hang check */
1077         wlan_check_hang();
1078
1079         /* RX Overrun check */
1080         wlan_check_rx_overrun();
1081
1082         if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1083                 wlan_mac_reset();
1084                 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1085         } else {
1086                 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1087                         fw.wlan.mac_reset--;
1088         }
1089 }