drivers/net/wireless/iwlwifi/iwl-agn-lib.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29 #include <linux/etherdevice.h>
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/sched.h>
  34
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-io.h"
  38 #include "iwl-helpers.h"
  39 #include "iwl-agn-hw.h"
  40 #include "iwl-agn.h"
  41 #include "iwl-sta.h"
  42
  43 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
  44 {
  45         return le32_to_cpup((__le32 *)&tx_resp->status +
  46                             tx_resp->frame_count) & MAX_SN;
  47 }
  48
  49 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
  50 {
  51         status &= TX_STATUS_MSK;
  52
  53         switch (status) {
  54         case TX_STATUS_POSTPONE_DELAY:
  55                 priv->_agn.reply_tx_stats.pp_delay++;
  56                 break;
  57         case TX_STATUS_POSTPONE_FEW_BYTES:
  58                 priv->_agn.reply_tx_stats.pp_few_bytes++;
  59                 break;
  60         case TX_STATUS_POSTPONE_BT_PRIO:
  61                 priv->_agn.reply_tx_stats.pp_bt_prio++;
  62                 break;
  63         case TX_STATUS_POSTPONE_QUIET_PERIOD:
  64                 priv->_agn.reply_tx_stats.pp_quiet_period++;
  65                 break;
  66         case TX_STATUS_POSTPONE_CALC_TTAK:
  67                 priv->_agn.reply_tx_stats.pp_calc_ttak++;
  68                 break;
  69         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
  70                 priv->_agn.reply_tx_stats.int_crossed_retry++;
  71                 break;
  72         case TX_STATUS_FAIL_SHORT_LIMIT:
  73                 priv->_agn.reply_tx_stats.short_limit++;
  74                 break;
  75         case TX_STATUS_FAIL_LONG_LIMIT:
  76                 priv->_agn.reply_tx_stats.long_limit++;
  77                 break;
  78         case TX_STATUS_FAIL_FIFO_UNDERRUN:
  79                 priv->_agn.reply_tx_stats.fifo_underrun++;
  80                 break;
  81         case TX_STATUS_FAIL_DRAIN_FLOW:
  82                 priv->_agn.reply_tx_stats.drain_flow++;
  83                 break;
  84         case TX_STATUS_FAIL_RFKILL_FLUSH:
  85                 priv->_agn.reply_tx_stats.rfkill_flush++;
  86                 break;
  87         case TX_STATUS_FAIL_LIFE_EXPIRE:
  88                 priv->_agn.reply_tx_stats.life_expire++;
  89                 break;
  90         case TX_STATUS_FAIL_DEST_PS:
  91                 priv->_agn.reply_tx_stats.dest_ps++;
  92                 break;
  93         case TX_STATUS_FAIL_HOST_ABORTED:
  94                 priv->_agn.reply_tx_stats.host_abort++;
  95                 break;
  96         case TX_STATUS_FAIL_BT_RETRY:
  97                 priv->_agn.reply_tx_stats.bt_retry++;
  98                 break;
  99         case TX_STATUS_FAIL_STA_INVALID:
 100                 priv->_agn.reply_tx_stats.sta_invalid++;
 101                 break;
 102         case TX_STATUS_FAIL_FRAG_DROPPED:
 103                 priv->_agn.reply_tx_stats.frag_drop++;
 104                 break;
 105         case TX_STATUS_FAIL_TID_DISABLE:
 106                 priv->_agn.reply_tx_stats.tid_disable++;
 107                 break;
 108         case TX_STATUS_FAIL_FIFO_FLUSHED:
 109                 priv->_agn.reply_tx_stats.fifo_flush++;
 110                 break;
 111         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
 112                 priv->_agn.reply_tx_stats.insuff_cf_poll++;
 113                 break;
 114         case TX_STATUS_FAIL_PASSIVE_NO_RX:
 115                 priv->_agn.reply_tx_stats.fail_hw_drop++;
 116                 break;
 117         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
 118                 priv->_agn.reply_tx_stats.sta_color_mismatch++;
 119                 break;
 120         default:
 121                 priv->_agn.reply_tx_stats.unknown++;
 122                 break;
 123         }
 124 }
 125
 126 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
 127 {
 128         status &= AGG_TX_STATUS_MSK;
 129
 130         switch (status) {
 131         case AGG_TX_STATE_UNDERRUN_MSK:
 132                 priv->_agn.reply_agg_tx_stats.underrun++;
 133                 break;
 134         case AGG_TX_STATE_BT_PRIO_MSK:
 135                 priv->_agn.reply_agg_tx_stats.bt_prio++;
 136                 break;
 137         case AGG_TX_STATE_FEW_BYTES_MSK:
 138                 priv->_agn.reply_agg_tx_stats.few_bytes++;
 139                 break;
 140         case AGG_TX_STATE_ABORT_MSK:
 141                 priv->_agn.reply_agg_tx_stats.abort++;
 142                 break;
 143         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
 144                 priv->_agn.reply_agg_tx_stats.last_sent_ttl++;
 145                 break;
 146         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
 147                 priv->_agn.reply_agg_tx_stats.last_sent_try++;
 148                 break;
 149         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
 150                 priv->_agn.reply_agg_tx_stats.last_sent_bt_kill++;
 151                 break;
 152         case AGG_TX_STATE_SCD_QUERY_MSK:
 153                 priv->_agn.reply_agg_tx_stats.scd_query++;
 154                 break;
 155         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
 156                 priv->_agn.reply_agg_tx_stats.bad_crc32++;
 157                 break;
 158         case AGG_TX_STATE_RESPONSE_MSK:
 159                 priv->_agn.reply_agg_tx_stats.response++;
 160                 break;
 161         case AGG_TX_STATE_DUMP_TX_MSK:
 162                 priv->_agn.reply_agg_tx_stats.dump_tx++;
 163                 break;
 164         case AGG_TX_STATE_DELAY_TX_MSK:
 165                 priv->_agn.reply_agg_tx_stats.delay_tx++;
 166                 break;
 167         default:
 168                 priv->_agn.reply_agg_tx_stats.unknown++;
 169                 break;
 170         }
 171 }
 172
 173 static void iwlagn_set_tx_status(struct iwl_priv *priv,
 174                                  struct ieee80211_tx_info *info,
 175                                  struct iwl_rxon_context *ctx,
 176                                  struct iwlagn_tx_resp *tx_resp,
 177                                  int txq_id, bool is_agg)
 178 {
 179         u16  status = le16_to_cpu(tx_resp->status.status);
 180
 181         info->status.rates[0].count = tx_resp->failure_frame + 1;
 182         if (is_agg)
 183                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 184         info->flags |= iwl_tx_status_to_mac80211(status);
 185         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
 186                                     info);
 187         if (!iwl_is_tx_success(status))
 188                 iwlagn_count_tx_err_status(priv, status);
 189
 190         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
 191             iwl_is_associated_ctx(ctx) && ctx->vif &&
 192             ctx->vif->type == NL80211_IFTYPE_STATION) {
 193                 ctx->last_tx_rejected = true;
 194                 iwl_stop_queue(priv, &priv->txq[txq_id]);
 195         }
 196
 197         IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x) rate_n_flags "
 198                            "0x%x retries %d\n",
 199                            txq_id,
 200                            iwl_get_tx_fail_reason(status), status,
 201                            le32_to_cpu(tx_resp->rate_n_flags),
 202                            tx_resp->failure_frame);
 203 }
 204
 205 #ifdef CONFIG_IWLWIFI_DEBUG
 206 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
 207
 208 const char *iwl_get_agg_tx_fail_reason(u16 status)
 209 {
 210         status &= AGG_TX_STATUS_MSK;
 211         switch (status) {
 212         case AGG_TX_STATE_TRANSMITTED:
 213                 return "SUCCESS";
 214                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
 215                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
 216                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
 217                 AGG_TX_STATE_FAIL(ABORT_MSK);
 218                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
 219                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
 220                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
 221                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
 222                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
 223                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
 224                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
 225                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
 226         }
 227
 228         return "UNKNOWN";
 229 }
 230 #endif /* CONFIG_IWLWIFI_DEBUG */
 231
 232 static int iwlagn_tx_status_reply_tx(struct iwl_priv *priv,
 233                                       struct iwl_ht_agg *agg,
 234                                       struct iwlagn_tx_resp *tx_resp,
 235                                       int txq_id, u16 start_idx)
 236 {
 237         u16 status;
 238         struct agg_tx_status *frame_status = &tx_resp->status;
 239         struct ieee80211_hdr *hdr = NULL;
 240         int i, sh, idx;
 241         u16 seq;
 242
 243         if (agg->wait_for_ba)
 244                 IWL_DEBUG_TX_REPLY(priv, "got tx response w/o block-ack\n");
 245
 246         agg->frame_count = tx_resp->frame_count;
 247         agg->start_idx = start_idx;
 248         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
 249         agg->bitmap = 0;
 250
 251         /* # frames attempted by Tx command */
 252         if (agg->frame_count == 1) {
 253                 struct iwl_tx_info *txb;
 254
 255                 /* Only one frame was attempted; no block-ack will arrive */
 256                 idx = start_idx;
 257
 258                 IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, StartIdx=%d idx=%d\n",
 259                                    agg->frame_count, agg->start_idx, idx);
 260                 txb = &priv->txq[txq_id].txb[idx];
 261                 iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(txb->skb),
 262                                      txb->ctx, tx_resp, txq_id, true);
 263                 agg->wait_for_ba = 0;
 264         } else {
 265                 /* Two or more frames were attempted; expect block-ack */
 266                 u64 bitmap = 0;
 267
 268                 /*
 269                  * Start is the lowest frame sent. It may not be the first
 270                  * frame in the batch; we figure this out dynamically during
 271                  * the following loop.
 272                  */
 273                 int start = agg->start_idx;
 274
 275                 /* Construct bit-map of pending frames within Tx window */
 276                 for (i = 0; i < agg->frame_count; i++) {
 277                         u16 sc;
 278                         status = le16_to_cpu(frame_status[i].status);
 279                         seq  = le16_to_cpu(frame_status[i].sequence);
 280                         idx = SEQ_TO_INDEX(seq);
 281                         txq_id = SEQ_TO_QUEUE(seq);
 282
 283                         if (status & AGG_TX_STATUS_MSK)
 284                                 iwlagn_count_agg_tx_err_status(priv, status);
 285
 286                         if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
 287                                       AGG_TX_STATE_ABORT_MSK))
 288                                 continue;
 289
 290                         IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, txq_id=%d idx=%d\n",
 291                                            agg->frame_count, txq_id, idx);
 292                         IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
 293                                            "try-count (0x%08x)\n",
 294                                            iwl_get_agg_tx_fail_reason(status),
 295                                            status & AGG_TX_STATUS_MSK,
 296                                            status & AGG_TX_TRY_MSK);
 297
 298                         hdr = iwl_tx_queue_get_hdr(priv, txq_id, idx);
 299                         if (!hdr) {
 300                                 IWL_ERR(priv,
 301                                         "BUG_ON idx doesn't point to valid skb"
 302                                         " idx=%d, txq_id=%d\n", idx, txq_id);
 303                                 return -1;
 304                         }
 305
 306                         sc = le16_to_cpu(hdr->seq_ctrl);
 307                         if (idx != (SEQ_TO_SN(sc) & 0xff)) {
 308                                 IWL_ERR(priv,
 309                                         "BUG_ON idx doesn't match seq control"
 310                                         " idx=%d, seq_idx=%d, seq=%d\n",
 311                                           idx, SEQ_TO_SN(sc),
 312                                           hdr->seq_ctrl);
 313                                 return -1;
 314                         }
 315
 316                         IWL_DEBUG_TX_REPLY(priv, "AGG Frame i=%d idx %d seq=%d\n",
 317                                            i, idx, SEQ_TO_SN(sc));
 318
 319                         /*
 320                          * sh -> how many frames ahead of the starting frame is
 321                          * the current one?
 322                          *
 323                          * Note that all frames sent in the batch must be in a
 324                          * 64-frame window, so this number should be in [0,63].
 325                          * If outside of this window, then we've found a new
 326                          * "first" frame in the batch and need to change start.
 327                          */
 328                         sh = idx - start;
 329
 330                         /*
 331                          * If >= 64, out of window. start must be at the front
 332                          * of the circular buffer, idx must be near the end of
 333                          * the buffer, and idx is the new "first" frame. Shift
 334                          * the indices around.
 335                          */
 336                         if (sh >= 64) {
 337                                 /* Shift bitmap by start - idx, wrapped */
 338                                 sh = 0x100 - idx + start;
 339                                 bitmap = bitmap << sh;
 340                                 /* Now idx is the new start so sh = 0 */
 341                                 sh = 0;
 342                                 start = idx;
 343                         /*
 344                          * If <= -64 then wraps the 256-pkt circular buffer
 345                          * (e.g., start = 255 and idx = 0, sh should be 1)
 346                          */
 347                         } else if (sh <= -64) {
 348                                 sh  = 0x100 - start + idx;
 349                         /*
 350                          * If < 0 but > -64, out of window. idx is before start
 351                          * but not wrapped. Shift the indices around.
 352                          */
 353                         } else if (sh < 0) {
 354                                 /* Shift by how far start is ahead of idx */
 355                                 sh = start - idx;
 356                                 bitmap = bitmap << sh;
 357                                 /* Now idx is the new start so sh = 0 */
 358                                 start = idx;
 359                                 sh = 0;
 360                         }
 361                         /* Sequence number start + sh was sent in this batch */
 362                         bitmap |= 1ULL << sh;
 363                         IWL_DEBUG_TX_REPLY(priv, "start=%d bitmap=0x%llx\n",
 364                                            start, (unsigned long long)bitmap);
 365                 }
 366
 367                 /*
 368                  * Store the bitmap and possibly the new start, if we wrapped
 369                  * the buffer above
 370                  */
 371                 agg->bitmap = bitmap;
 372                 agg->start_idx = start;
 373                 IWL_DEBUG_TX_REPLY(priv, "Frames %d start_idx=%d bitmap=0x%llx\n",
 374                                    agg->frame_count, agg->start_idx,
 375                                    (unsigned long long)agg->bitmap);
 376
 377                 if (bitmap)
 378                         agg->wait_for_ba = 1;
 379         }
 380         return 0;
 381 }
 382
 383 void iwl_check_abort_status(struct iwl_priv *priv,
 384                             u8 frame_count, u32 status)
 385 {
 386         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
 387                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
 388                 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
 389                         queue_work(priv->workqueue, &priv->tx_flush);
 390         }
 391 }
 392
 393 static void iwlagn_rx_reply_tx(struct iwl_priv *priv,
 394                                 struct iwl_rx_mem_buffer *rxb)
 395 {
 396         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 397         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 398         int txq_id = SEQ_TO_QUEUE(sequence);
 399         int index = SEQ_TO_INDEX(sequence);
 400         struct iwl_tx_queue *txq = &priv->txq[txq_id];
 401         struct ieee80211_tx_info *info;
 402         struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
 403         struct iwl_tx_info *txb;
 404         u32 status = le16_to_cpu(tx_resp->status.status);
 405         int tid;
 406         int sta_id;
 407         int freed;
 408         unsigned long flags;
 409
 410         if ((index >= txq->q.n_bd) || (iwl_queue_used(&txq->q, index) == 0)) {
 411                 IWL_ERR(priv, "%s: Read index for DMA queue txq_id (%d) "
 412                           "index %d is out of range [0-%d] %d %d\n", __func__,
 413                           txq_id, index, txq->q.n_bd, txq->q.write_ptr,
 414                           txq->q.read_ptr);
 415                 return;
 416         }
 417
 418         txq->time_stamp = jiffies;
 419         txb = &txq->txb[txq->q.read_ptr];
 420         info = IEEE80211_SKB_CB(txb->skb);
 421         memset(&info->status, 0, sizeof(info->status));
 422
 423         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 424                 IWLAGN_TX_RES_TID_POS;
 425         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 426                 IWLAGN_TX_RES_RA_POS;
 427
 428         spin_lock_irqsave(&priv->sta_lock, flags);
 429         if (txq->sched_retry) {
 430                 const u32 scd_ssn = iwlagn_get_scd_ssn(tx_resp);
 431                 struct iwl_ht_agg *agg;
 432
 433                 agg = &priv->stations[sta_id].tid[tid].agg;
 434                 /*
 435                  * If the BT kill count is non-zero, we'll get this
 436                  * notification again.
 437                  */
 438                 if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
 439                     priv->cfg->bt_params &&
 440                     priv->cfg->bt_params->advanced_bt_coexist) {
 441                         IWL_WARN(priv, "receive reply tx with bt_kill\n");
 442                 }
 443                 iwlagn_tx_status_reply_tx(priv, agg, tx_resp, txq_id, index);
 444
 445                 /* check if BAR is needed */
 446                 if ((tx_resp->frame_count == 1) && !iwl_is_tx_success(status))
 447                         info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 448
 449                 if (txq->q.read_ptr != (scd_ssn & 0xff)) {
 450                         index = iwl_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd);
 451                         IWL_DEBUG_TX_REPLY(priv, "Retry scheduler reclaim "
 452                                         "scd_ssn=%d idx=%d txq=%d swq=%d\n",
 453                                         scd_ssn , index, txq_id, txq->swq_id);
 454
 455                         freed = iwlagn_tx_queue_reclaim(priv, txq_id, index);
 456                         iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
 457
 458                         if (priv->mac80211_registered &&
 459                             (iwl_queue_space(&txq->q) > txq->q.low_mark) &&
 460                             (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA))
 461                                 iwl_wake_queue(priv, txq);
 462                 }
 463         } else {
 464                 iwlagn_set_tx_status(priv, info, txb->ctx, tx_resp,
 465                                      txq_id, false);
 466                 freed = iwlagn_tx_queue_reclaim(priv, txq_id, index);
 467                 iwl_free_tfds_in_queue(priv, sta_id, tid, freed);
 468
 469                 if (priv->mac80211_registered &&
 470                     iwl_queue_space(&txq->q) > txq->q.low_mark &&
 471                     status != TX_STATUS_FAIL_PASSIVE_NO_RX)
 472                         iwl_wake_queue(priv, txq);
 473         }
 474
 475         iwlagn_txq_check_empty(priv, sta_id, tid, txq_id);
 476
 477         iwl_check_abort_status(priv, tx_resp->frame_count, status);
 478         spin_unlock_irqrestore(&priv->sta_lock, flags);
 479 }
 480
 481 void iwlagn_rx_handler_setup(struct iwl_priv *priv)
 482 {
 483         /* init calibration handlers */
 484         priv->rx_handlers[CALIBRATION_RES_NOTIFICATION] =
 485                                         iwlagn_rx_calib_result;
 486         priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;
 487
 488         /* set up notification wait support */
 489         spin_lock_init(&priv->_agn.notif_wait_lock);
 490         INIT_LIST_HEAD(&priv->_agn.notif_waits);
 491         init_waitqueue_head(&priv->_agn.notif_waitq);
 492 }
 493
 494 void iwlagn_setup_deferred_work(struct iwl_priv *priv)
 495 {
 496         /*
 497          * nothing need to be done here anymore
 498          * still keep for future use if needed
 499          */
 500 }
 501
 502 int iwlagn_hw_valid_rtc_data_addr(u32 addr)
 503 {
 504         return (addr >= IWLAGN_RTC_DATA_LOWER_BOUND) &&
 505                 (addr < IWLAGN_RTC_DATA_UPPER_BOUND);
 506 }
 507
 508 int iwlagn_send_tx_power(struct iwl_priv *priv)
 509 {
 510         struct iwlagn_tx_power_dbm_cmd tx_power_cmd;
 511         u8 tx_ant_cfg_cmd;
 512
 513         if (WARN_ONCE(test_bit(STATUS_SCAN_HW, &priv->status),
 514                       "TX Power requested while scanning!\n"))
 515                 return -EAGAIN;
 516
 517         /* half dBm need to multiply */
 518         tx_power_cmd.global_lmt = (s8)(2 * priv->tx_power_user_lmt);
 519
 520         if (priv->tx_power_lmt_in_half_dbm &&
 521             priv->tx_power_lmt_in_half_dbm < tx_power_cmd.global_lmt) {
 522                 /*
 523                  * For the newer devices which using enhanced/extend tx power
 524                  * table in EEPROM, the format is in half dBm. driver need to
 525                  * convert to dBm format before report to mac80211.
 526                  * By doing so, there is a possibility of 1/2 dBm resolution
 527                  * lost. driver will perform "round-up" operation before
 528                  * reporting, but it will cause 1/2 dBm tx power over the
 529                  * regulatory limit. Perform the checking here, if the
 530                  * "tx_power_user_lmt" is higher than EEPROM value (in
 531                  * half-dBm format), lower the tx power based on EEPROM
 532                  */
 533                 tx_power_cmd.global_lmt = priv->tx_power_lmt_in_half_dbm;
 534         }
 535         tx_power_cmd.flags = IWLAGN_TX_POWER_NO_CLOSED;
 536         tx_power_cmd.srv_chan_lmt = IWLAGN_TX_POWER_AUTO;
 537
 538         if (IWL_UCODE_API(priv->ucode_ver) == 1)
 539                 tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD_V1;
 540         else
 541                 tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD;
 542
 543         return iwl_send_cmd_pdu(priv, tx_ant_cfg_cmd, sizeof(tx_power_cmd),
 544                                 &tx_power_cmd);
 545 }
 546
 547 void iwlagn_temperature(struct iwl_priv *priv)
 548 {
 549         /* store temperature from correct statistics (in Celsius) */
 550         priv->temperature = le32_to_cpu(priv->statistics.common.temperature);
 551         iwl_tt_handler(priv);
 552 }
 553
 554 u16 iwlagn_eeprom_calib_version(struct iwl_priv *priv)
 555 {
 556         struct iwl_eeprom_calib_hdr {
 557                 u8 version;
 558                 u8 pa_type;
 559                 u16 voltage;
 560         } *hdr;
 561
 562         hdr = (struct iwl_eeprom_calib_hdr *)iwl_eeprom_query_addr(priv,
 563                                                         EEPROM_CALIB_ALL);
 564         return hdr->version;
 565
 566 }
 567
 568 /*
 569  * EEPROM
 570  */
 571 static u32 eeprom_indirect_address(const struct iwl_priv *priv, u32 address)
 572 {
 573         u16 offset = 0;
 574
 575         if ((address & INDIRECT_ADDRESS) == 0)
 576                 return address;
 577
 578         switch (address & INDIRECT_TYPE_MSK) {
 579         case INDIRECT_HOST:
 580                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_HOST);
 581                 break;
 582         case INDIRECT_GENERAL:
 583                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_GENERAL);
 584                 break;
 585         case INDIRECT_REGULATORY:
 586                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_REGULATORY);
 587                 break;
 588         case INDIRECT_TXP_LIMIT:
 589                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_TXP_LIMIT);
 590                 break;
 591         case INDIRECT_TXP_LIMIT_SIZE:
 592                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_TXP_LIMIT_SIZE);
 593                 break;
 594         case INDIRECT_CALIBRATION:
 595                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_CALIBRATION);
 596                 break;
 597         case INDIRECT_PROCESS_ADJST:
 598                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_PROCESS_ADJST);
 599                 break;
 600         case INDIRECT_OTHERS:
 601                 offset = iwl_eeprom_query16(priv, EEPROM_LINK_OTHERS);
 602                 break;
 603         default:
 604                 IWL_ERR(priv, "illegal indirect type: 0x%X\n",
 605                 address & INDIRECT_TYPE_MSK);
 606                 break;
 607         }
 608
 609         /* translate the offset from words to byte */
 610         return (address & ADDRESS_MSK) + (offset << 1);
 611 }
 612
 613 const u8 *iwlagn_eeprom_query_addr(const struct iwl_priv *priv,
 614                                            size_t offset)
 615 {
 616         u32 address = eeprom_indirect_address(priv, offset);
 617         BUG_ON(address >= priv->cfg->base_params->eeprom_size);
 618         return &priv->eeprom[address];
 619 }
 620
 621 struct iwl_mod_params iwlagn_mod_params = {
 622         .amsdu_size_8K = 1,
 623         .restart_fw = 1,
 624         .plcp_check = true,
 625         .bt_coex_active = true,
 626         /* the rest are 0 by default */
 627 };
 628
 629 void iwlagn_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 630 {
 631         unsigned long flags;
 632         int i;
 633         spin_lock_irqsave(&rxq->lock, flags);
 634         INIT_LIST_HEAD(&rxq->rx_free);
 635         INIT_LIST_HEAD(&rxq->rx_used);
 636         /* Fill the rx_used queue with _all_ of the Rx buffers */
 637         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) {
 638                 /* In the reset function, these buffers may have been allocated
 639                  * to an SKB, so we need to unmap and free potential storage */
 640                 if (rxq->pool[i].page != NULL) {
 641                         pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
 642                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 643                                 PCI_DMA_FROMDEVICE);
 644                         __iwl_free_pages(priv, rxq->pool[i].page);
 645                         rxq->pool[i].page = NULL;
 646                 }
 647                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 648         }
 649
 650         for (i = 0; i < RX_QUEUE_SIZE; i++)
 651                 rxq->queue[i] = NULL;
 652
 653         /* Set us so that we have processed and used all buffers, but have
 654          * not restocked the Rx queue with fresh buffers */
 655         rxq->read = rxq->write = 0;
 656         rxq->write_actual = 0;
 657         rxq->free_count = 0;
 658         spin_unlock_irqrestore(&rxq->lock, flags);
 659 }
 660
 661 int iwlagn_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 662 {
 663         u32 rb_size;
 664         const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */
 665         u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */
 666
 667         rb_timeout = RX_RB_TIMEOUT;
 668
 669         if (iwlagn_mod_params.amsdu_size_8K)
 670                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 671         else
 672                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
 673
 674         /* Stop Rx DMA */
 675         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 676
 677         /* Reset driver's Rx queue write index */
 678         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
 679
 680         /* Tell device where to find RBD circular buffer in DRAM */
 681         iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 682                            (u32)(rxq->bd_dma >> 8));
 683
 684         /* Tell device where in DRAM to update its Rx status */
 685         iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
 686                            rxq->rb_stts_dma >> 4);
 687
 688         /* Enable Rx DMA
 689          * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in
 690          *      the credit mechanism in 5000 HW RX FIFO
 691          * Direct rx interrupts to hosts
 692          * Rx buffer size 4 or 8k
 693          * RB timeout 0x10
 694          * 256 RBDs
 695          */
 696         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 697                            FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 698                            FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY |
 699                            FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
 700                            FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK |
 701                            rb_size|
 702                            (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)|
 703                            (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS));
 704
 705         /* Set interrupt coalescing timer to default (2048 usecs) */
 706         iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF);
 707
 708         return 0;
 709 }
 710
 711 static void iwlagn_set_pwr_vmain(struct iwl_priv *priv)
 712 {
 713 /*
 714  * (for documentation purposes)
 715  * to set power to V_AUX, do:
 716
 717                 if (pci_pme_capable(priv->pci_dev, PCI_D3cold))
 718                         iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
 719                                                APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
 720                                                ~APMG_PS_CTRL_MSK_PWR_SRC);
 721  */
 722
 723         iwl_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
 724                                APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
 725                                ~APMG_PS_CTRL_MSK_PWR_SRC);
 726 }
 727
 728 int iwlagn_hw_nic_init(struct iwl_priv *priv)
 729 {
 730         unsigned long flags;
 731         struct iwl_rx_queue *rxq = &priv->rxq;
 732         int ret;
 733
 734         /* nic_init */
 735         spin_lock_irqsave(&priv->lock, flags);
 736         priv->cfg->ops->lib->apm_ops.init(priv);
 737
 738         /* Set interrupt coalescing calibration timer to default (512 usecs) */
 739         iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF);
 740
 741         spin_unlock_irqrestore(&priv->lock, flags);
 742
 743         iwlagn_set_pwr_vmain(priv);
 744
 745         priv->cfg->ops->lib->apm_ops.config(priv);
 746
 747         /* Allocate the RX queue, or reset if it is already allocated */
 748         if (!rxq->bd) {
 749                 ret = iwl_rx_queue_alloc(priv);
 750                 if (ret) {
 751                         IWL_ERR(priv, "Unable to initialize Rx queue\n");
 752                         return -ENOMEM;
 753                 }
 754         } else
 755                 iwlagn_rx_queue_reset(priv, rxq);
 756
 757         iwlagn_rx_replenish(priv);
 758
 759         iwlagn_rx_init(priv, rxq);
 760
 761         spin_lock_irqsave(&priv->lock, flags);
 762
 763         rxq->need_update = 1;
 764         iwl_rx_queue_update_write_ptr(priv, rxq);
 765
 766         spin_unlock_irqrestore(&priv->lock, flags);
 767
 768         /* Allocate or reset and init all Tx and Command queues */
 769         if (!priv->txq) {
 770                 ret = iwlagn_txq_ctx_alloc(priv);
 771                 if (ret)
 772                         return ret;
 773         } else
 774                 iwlagn_txq_ctx_reset(priv);
 775
 776         if (priv->cfg->base_params->shadow_reg_enable) {
 777                 /* enable shadow regs in HW */
 778                 iwl_set_bit(priv, CSR_MAC_SHADOW_REG_CTRL,
 779                         0x800FFFFF);
 780         }
 781
 782         set_bit(STATUS_INIT, &priv->status);
 783
 784         return 0;
 785 }
 786
 787 /**
 788  * iwlagn_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr
 789  */
 790 static inline __le32 iwlagn_dma_addr2rbd_ptr(struct iwl_priv *priv,
 791                                           dma_addr_t dma_addr)
 792 {
 793         return cpu_to_le32((u32)(dma_addr >> 8));
 794 }
 795
 796 /**
 797  * iwlagn_rx_queue_restock - refill RX queue from pre-allocated pool
 798  *
 799  * If there are slots in the RX queue that need to be restocked,
 800  * and we have free pre-allocated buffers, fill the ranks as much
 801  * as we can, pulling from rx_free.
 802  *
 803  * This moves the 'write' index forward to catch up with 'processed', and
 804  * also updates the memory address in the firmware to reference the new
 805  * target buffer.
 806  */
 807 void iwlagn_rx_queue_restock(struct iwl_priv *priv)
 808 {
 809         struct iwl_rx_queue *rxq = &priv->rxq;
 810         struct list_head *element;
 811         struct iwl_rx_mem_buffer *rxb;
 812         unsigned long flags;
 813
 814         spin_lock_irqsave(&rxq->lock, flags);
 815         while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) {
 816                 /* The overwritten rxb must be a used one */
 817                 rxb = rxq->queue[rxq->write];
 818                 BUG_ON(rxb && rxb->page);
 819
 820                 /* Get next free Rx buffer, remove from free list */
 821                 element = rxq->rx_free.next;
 822                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 823                 list_del(element);
 824
 825                 /* Point to Rx buffer via next RBD in circular buffer */
 826                 rxq->bd[rxq->write] = iwlagn_dma_addr2rbd_ptr(priv,
 827                                                               rxb->page_dma);
 828                 rxq->queue[rxq->write] = rxb;
 829                 rxq->write = (rxq->write + 1) & RX_QUEUE_MASK;
 830                 rxq->free_count--;
 831         }
 832         spin_unlock_irqrestore(&rxq->lock, flags);
 833         /* If the pre-allocated buffer pool is dropping low, schedule to
 834          * refill it */
 835         if (rxq->free_count <= RX_LOW_WATERMARK)
 836                 queue_work(priv->workqueue, &priv->rx_replenish);
 837
 838
 839         /* If we've added more space for the firmware to place data, tell it.
 840          * Increment device's write pointer in multiples of 8. */
 841         if (rxq->write_actual != (rxq->write & ~0x7)) {
 842                 spin_lock_irqsave(&rxq->lock, flags);
 843                 rxq->need_update = 1;
 844                 spin_unlock_irqrestore(&rxq->lock, flags);
 845                 iwl_rx_queue_update_write_ptr(priv, rxq);
 846         }
 847 }
 848
 849 /**
 850  * iwlagn_rx_replenish - Move all used packet from rx_used to rx_free
 851  *
 852  * When moving to rx_free an SKB is allocated for the slot.
 853  *
 854  * Also restock the Rx queue via iwl_rx_queue_restock.
 855  * This is called as a scheduled work item (except for during initialization)
 856  */
 857 void iwlagn_rx_allocate(struct iwl_priv *priv, gfp_t priority)
 858 {
 859         struct iwl_rx_queue *rxq = &priv->rxq;
 860         struct list_head *element;
 861         struct iwl_rx_mem_buffer *rxb;
 862         struct page *page;
 863         unsigned long flags;
 864         gfp_t gfp_mask = priority;
 865
 866         while (1) {
 867                 spin_lock_irqsave(&rxq->lock, flags);
 868                 if (list_empty(&rxq->rx_used)) {
 869                         spin_unlock_irqrestore(&rxq->lock, flags);
 870                         return;
 871                 }
 872                 spin_unlock_irqrestore(&rxq->lock, flags);
 873
 874                 if (rxq->free_count > RX_LOW_WATERMARK)
 875                         gfp_mask |= __GFP_NOWARN;
 876
 877                 if (priv->hw_params.rx_page_order > 0)
 878                         gfp_mask |= __GFP_COMP;
 879
 880                 /* Alloc a new receive buffer */
 881                 page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order);
 882                 if (!page) {
 883                         if (net_ratelimit())
 884                                 IWL_DEBUG_INFO(priv, "alloc_pages failed, "
 885                                                "order: %d\n",
 886                                                priv->hw_params.rx_page_order);
 887
 888                         if ((rxq->free_count <= RX_LOW_WATERMARK) &&
 889                             net_ratelimit())
 890                                 IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n",
 891                                          priority == GFP_ATOMIC ?  "GFP_ATOMIC" : "GFP_KERNEL",
 892                                          rxq->free_count);
 893                         /* We don't reschedule replenish work here -- we will
 894                          * call the restock method and if it still needs
 895                          * more buffers it will schedule replenish */
 896                         return;
 897                 }
 898
 899                 spin_lock_irqsave(&rxq->lock, flags);
 900
 901                 if (list_empty(&rxq->rx_used)) {
 902                         spin_unlock_irqrestore(&rxq->lock, flags);
 903                         __free_pages(page, priv->hw_params.rx_page_order);
 904                         return;
 905                 }
 906                 element = rxq->rx_used.next;
 907                 rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
 908                 list_del(element);
 909
 910                 spin_unlock_irqrestore(&rxq->lock, flags);
 911
 912                 BUG_ON(rxb->page);
 913                 rxb->page = page;
 914                 /* Get physical address of the RB */
 915                 rxb->page_dma = pci_map_page(priv->pci_dev, page, 0,
 916                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 917                                 PCI_DMA_FROMDEVICE);
 918                 /* dma address must be no more than 36 bits */
 919                 BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36));
 920                 /* and also 256 byte aligned! */
 921                 BUG_ON(rxb->page_dma & DMA_BIT_MASK(8));
 922
 923                 spin_lock_irqsave(&rxq->lock, flags);
 924
 925                 list_add_tail(&rxb->list, &rxq->rx_free);
 926                 rxq->free_count++;
 927
 928                 spin_unlock_irqrestore(&rxq->lock, flags);
 929         }
 930 }
 931
 932 void iwlagn_rx_replenish(struct iwl_priv *priv)
 933 {
 934         unsigned long flags;
 935
 936         iwlagn_rx_allocate(priv, GFP_KERNEL);
 937
 938         spin_lock_irqsave(&priv->lock, flags);
 939         iwlagn_rx_queue_restock(priv);
 940         spin_unlock_irqrestore(&priv->lock, flags);
 941 }
 942
 943 void iwlagn_rx_replenish_now(struct iwl_priv *priv)
 944 {
 945         iwlagn_rx_allocate(priv, GFP_ATOMIC);
 946
 947         iwlagn_rx_queue_restock(priv);
 948 }
 949
 950 /* Assumes that the skb field of the buffers in 'pool' is kept accurate.
 951  * If an SKB has been detached, the POOL needs to have its SKB set to NULL
 952  * This free routine walks the list of POOL entries and if SKB is set to
 953  * non NULL it is unmapped and freed
 954  */
 955 void iwlagn_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq)
 956 {
 957         int i;
 958         for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) {
 959                 if (rxq->pool[i].page != NULL) {
 960                         pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma,
 961                                 PAGE_SIZE << priv->hw_params.rx_page_order,
 962                                 PCI_DMA_FROMDEVICE);
 963                         __iwl_free_pages(priv, rxq->pool[i].page);
 964                         rxq->pool[i].page = NULL;
 965                 }
 966         }
 967
 968         dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 969                           rxq->bd_dma);
 970         dma_free_coherent(&priv->pci_dev->dev, sizeof(struct iwl_rb_status),
 971                           rxq->rb_stts, rxq->rb_stts_dma);
 972         rxq->bd = NULL;
 973         rxq->rb_stts  = NULL;
 974 }
 975
 976 int iwlagn_rxq_stop(struct iwl_priv *priv)
 977 {
 978
 979         /* stop Rx DMA */
 980         iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 981         iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
 982                             FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000);
 983
 984         return 0;
 985 }
 986
 987 int iwlagn_hwrate_to_mac80211_idx(u32 rate_n_flags, enum ieee80211_band band)
 988 {
 989         int idx = 0;
 990         int band_offset = 0;
 991
 992         /* HT rate format: mac80211 wants an MCS number, which is just LSB */
 993         if (rate_n_flags & RATE_MCS_HT_MSK) {
 994                 idx = (rate_n_flags & 0xff);
 995                 return idx;
 996         /* Legacy rate format, search for match in table */
 997         } else {
 998                 if (band == IEEE80211_BAND_5GHZ)
 999                         band_offset = IWL_FIRST_OFDM_RATE;
1000                 for (idx = band_offset; idx < IWL_RATE_COUNT_LEGACY; idx++)
1001                         if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF))
1002                                 return idx - band_offset;
1003         }
1004
1005         return -1;
1006 }
1007
1008 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
1009                                            struct ieee80211_vif *vif,
1010                                            enum ieee80211_band band,
1011                                            struct iwl_scan_channel *scan_ch)
1012 {
1013         const struct ieee80211_supported_band *sband;
1014         u16 passive_dwell = 0;
1015         u16 active_dwell = 0;
1016         int added = 0;
1017         u16 channel = 0;
1018
1019         sband = iwl_get_hw_mode(priv, band);
1020         if (!sband) {
1021                 IWL_ERR(priv, "invalid band\n");
1022                 return added;
1023         }
1024
1025         active_dwell = iwl_get_active_dwell_time(priv, band, 0);
1026         passive_dwell = iwl_get_passive_dwell_time(priv, band, vif);
1027
1028         if (passive_dwell <= active_dwell)
1029                 passive_dwell = active_dwell + 1;
1030
1031         channel = iwl_get_single_channel_number(priv, band);
1032         if (channel) {
1033                 scan_ch->channel = cpu_to_le16(channel);
1034                 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
1035                 scan_ch->active_dwell = cpu_to_le16(active_dwell);
1036                 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
1037                 /* Set txpower levels to defaults */
1038                 scan_ch->dsp_atten = 110;
1039                 if (band == IEEE80211_BAND_5GHZ)
1040                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
1041                 else
1042                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
1043                 added++;
1044         } else
1045                 IWL_ERR(priv, "no valid channel found\n");
1046         return added;
1047 }
1048
1049 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
1050                                      struct ieee80211_vif *vif,
1051                                      enum ieee80211_band band,
1052                                      u8 is_active, u8 n_probes,
1053                                      struct iwl_scan_channel *scan_ch)
1054 {
1055         struct ieee80211_channel *chan;
1056         const struct ieee80211_supported_band *sband;
1057         const struct iwl_channel_info *ch_info;
1058         u16 passive_dwell = 0;
1059         u16 active_dwell = 0;
1060         int added, i;
1061         u16 channel;
1062
1063         sband = iwl_get_hw_mode(priv, band);
1064         if (!sband)
1065                 return 0;
1066
1067         active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
1068         passive_dwell = iwl_get_passive_dwell_time(priv, band, vif);
1069
1070         if (passive_dwell <= active_dwell)
1071                 passive_dwell = active_dwell + 1;
1072
1073         for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
1074                 chan = priv->scan_request->channels[i];
1075
1076                 if (chan->band != band)
1077                         continue;
1078
1079                 channel = chan->hw_value;
1080                 scan_ch->channel = cpu_to_le16(channel);
1081
1082                 ch_info = iwl_get_channel_info(priv, band, channel);
1083                 if (!is_channel_valid(ch_info)) {
1084                         IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
1085                                         channel);
1086                         continue;
1087                 }
1088
1089                 if (!is_active || is_channel_passive(ch_info) ||
1090                     (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
1091                         scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
1092                 else
1093                         scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
1094
1095                 if (n_probes)
1096                         scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
1097
1098                 scan_ch->active_dwell = cpu_to_le16(active_dwell);
1099                 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
1100
1101                 /* Set txpower levels to defaults */
1102                 scan_ch->dsp_atten = 110;
1103
1104                 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
1105                  * power level:
1106                  * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
1107                  */
1108                 if (band == IEEE80211_BAND_5GHZ)
1109                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
1110                 else
1111                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
1112
1113                 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
1114                                channel, le32_to_cpu(scan_ch->type),
1115                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
1116                                 "ACTIVE" : "PASSIVE",
1117                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
1118                                active_dwell : passive_dwell);
1119
1120                 scan_ch++;
1121                 added++;
1122         }
1123
1124         IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
1125         return added;
1126 }
1127
1128 static int iwl_fill_offch_tx(struct iwl_priv *priv, void *data, size_t maxlen)
1129 {
1130         struct sk_buff *skb = priv->_agn.offchan_tx_skb;
1131
1132         if (skb->len < maxlen)
1133                 maxlen = skb->len;
1134
1135         memcpy(data, skb->data, maxlen);
1136
1137         return maxlen;
1138 }
1139
1140 int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
1141 {
1142         struct iwl_host_cmd cmd = {
1143                 .id = REPLY_SCAN_CMD,
1144                 .len = { sizeof(struct iwl_scan_cmd), },
1145         };
1146         struct iwl_scan_cmd *scan;
1147         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
1148         u32 rate_flags = 0;
1149         u16 cmd_len;
1150         u16 rx_chain = 0;
1151         enum ieee80211_band band;
1152         u8 n_probes = 0;
1153         u8 rx_ant = priv->hw_params.valid_rx_ant;
1154         u8 rate;
1155         bool is_active = false;
1156         int  chan_mod;
1157         u8 active_chains;
1158         u8 scan_tx_antennas = priv->hw_params.valid_tx_ant;
1159         int ret;
1160
1161         lockdep_assert_held(&priv->mutex);
1162
1163         if (vif)
1164                 ctx = iwl_rxon_ctx_from_vif(vif);
1165
1166         if (!priv->scan_cmd) {
1167                 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
1168                                          IWL_MAX_SCAN_SIZE, GFP_KERNEL);
1169                 if (!priv->scan_cmd) {
1170                         IWL_DEBUG_SCAN(priv,
1171                                        "fail to allocate memory for scan\n");
1172                         return -ENOMEM;
1173                 }
1174         }
1175         scan = priv->scan_cmd;
1176         memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
1177
1178         scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
1179         scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
1180
1181         if (priv->scan_type != IWL_SCAN_OFFCH_TX &&
1182             iwl_is_any_associated(priv)) {
1183                 u16 interval = 0;
1184                 u32 extra;
1185                 u32 suspend_time = 100;
1186                 u32 scan_suspend_time = 100;
1187
1188                 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
1189                 switch (priv->scan_type) {
1190                 case IWL_SCAN_OFFCH_TX:
1191                         WARN_ON(1);
1192                         break;
1193                 case IWL_SCAN_RADIO_RESET:
1194                         interval = 0;
1195                         break;
1196                 case IWL_SCAN_NORMAL:
1197                         interval = vif->bss_conf.beacon_int;
1198                         break;
1199                 }
1200
1201                 scan->suspend_time = 0;
1202                 scan->max_out_time = cpu_to_le32(200 * 1024);
1203                 if (!interval)
1204                         interval = suspend_time;
1205
1206                 extra = (suspend_time / interval) << 22;
1207                 scan_suspend_time = (extra |
1208                     ((suspend_time % interval) * 1024));
1209                 scan->suspend_time = cpu_to_le32(scan_suspend_time);
1210                 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
1211                                scan_suspend_time, interval);
1212         } else if (priv->scan_type == IWL_SCAN_OFFCH_TX) {
1213                 scan->suspend_time = 0;
1214                 scan->max_out_time =
1215                         cpu_to_le32(1024 * priv->_agn.offchan_tx_timeout);
1216         }
1217
1218         switch (priv->scan_type) {
1219         case IWL_SCAN_RADIO_RESET:
1220                 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
1221                 break;
1222         case IWL_SCAN_NORMAL:
1223                 if (priv->scan_request->n_ssids) {
1224                         int i, p = 0;
1225                         IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
1226                         for (i = 0; i < priv->scan_request->n_ssids; i++) {
1227                                 /* always does wildcard anyway */
1228                                 if (!priv->scan_request->ssids[i].ssid_len)
1229                                         continue;
1230                                 scan->direct_scan[p].id = WLAN_EID_SSID;
1231                                 scan->direct_scan[p].len =
1232                                         priv->scan_request->ssids[i].ssid_len;
1233                                 memcpy(scan->direct_scan[p].ssid,
1234                                        priv->scan_request->ssids[i].ssid,
1235                                        priv->scan_request->ssids[i].ssid_len);
1236                                 n_probes++;
1237                                 p++;
1238                         }
1239                         is_active = true;
1240                 } else
1241                         IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
1242                 break;
1243         case IWL_SCAN_OFFCH_TX:
1244                 IWL_DEBUG_SCAN(priv, "Start offchannel TX scan.\n");
1245                 break;
1246         }
1247
1248         scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
1249         scan->tx_cmd.sta_id = ctx->bcast_sta_id;
1250         scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
1251
1252         switch (priv->scan_band) {
1253         case IEEE80211_BAND_2GHZ:
1254                 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
1255                 chan_mod = le32_to_cpu(
1256                         priv->contexts[IWL_RXON_CTX_BSS].active.flags &
1257                                                 RXON_FLG_CHANNEL_MODE_MSK)
1258                                        >> RXON_FLG_CHANNEL_MODE_POS;
1259                 if (chan_mod == CHANNEL_MODE_PURE_40) {
1260                         rate = IWL_RATE_6M_PLCP;
1261                 } else {
1262                         rate = IWL_RATE_1M_PLCP;
1263                         rate_flags = RATE_MCS_CCK_MSK;
1264                 }
1265                 /*
1266                  * Internal scans are passive, so we can indiscriminately set
1267                  * the BT ignore flag on 2.4 GHz since it applies to TX only.
1268                  */
1269                 if (priv->cfg->bt_params &&
1270                     priv->cfg->bt_params->advanced_bt_coexist)
1271                         scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
1272                 break;
1273         case IEEE80211_BAND_5GHZ:
1274                 rate = IWL_RATE_6M_PLCP;
1275                 break;
1276         default:
1277                 IWL_WARN(priv, "Invalid scan band\n");
1278                 return -EIO;
1279         }
1280
1281         /*
1282          * If active scanning is requested but a certain channel is
1283          * marked passive, we can do active scanning if we detect
1284          * transmissions.
1285          *
1286          * There is an issue with some firmware versions that triggers
1287          * a sysassert on a "good CRC threshold" of zero (== disabled),
1288          * on a radar channel even though this means that we should NOT
1289          * send probes.
1290          *
1291          * The "good CRC threshold" is the number of frames that we
1292          * need to receive during our dwell time on a channel before
1293          * sending out probes -- setting this to a huge value will
1294          * mean we never reach it, but at the same time work around
1295          * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
1296          * here instead of IWL_GOOD_CRC_TH_DISABLED.
1297          *
1298          * This was fixed in later versions along with some other
1299          * scan changes, and the threshold behaves as a flag in those
1300          * versions.
1301          */
1302         if (priv->new_scan_threshold_behaviour)
1303                 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
1304                                                 IWL_GOOD_CRC_TH_DISABLED;
1305         else
1306                 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
1307                                                 IWL_GOOD_CRC_TH_NEVER;
1308
1309         band = priv->scan_band;
1310
1311         if (priv->cfg->scan_rx_antennas[band])
1312                 rx_ant = priv->cfg->scan_rx_antennas[band];
1313
1314         if (band == IEEE80211_BAND_2GHZ &&
1315             priv->cfg->bt_params &&
1316             priv->cfg->bt_params->advanced_bt_coexist) {
1317                 /* transmit 2.4 GHz probes only on first antenna */
1318                 scan_tx_antennas = first_antenna(scan_tx_antennas);
1319         }
1320
1321         priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band],
1322                                                     scan_tx_antennas);
1323         rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
1324         scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
1325
1326         /* In power save mode use one chain, otherwise use all chains */
1327         if (test_bit(STATUS_POWER_PMI, &priv->status)) {
1328                 /* rx_ant has been set to all valid chains previously */
1329                 active_chains = rx_ant &
1330                                 ((u8)(priv->chain_noise_data.active_chains));
1331                 if (!active_chains)
1332                         active_chains = rx_ant;
1333
1334                 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
1335                                 priv->chain_noise_data.active_chains);
1336
1337                 rx_ant = first_antenna(active_chains);
1338         }
1339         if (priv->cfg->bt_params &&
1340             priv->cfg->bt_params->advanced_bt_coexist &&
1341             priv->bt_full_concurrent) {
1342                 /* operated as 1x1 in full concurrency mode */
1343                 rx_ant = first_antenna(rx_ant);
1344         }
1345
1346         /* MIMO is not used here, but value is required */
1347         rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
1348         rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
1349         rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
1350         rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
1351         scan->rx_chain = cpu_to_le16(rx_chain);
1352         switch (priv->scan_type) {
1353         case IWL_SCAN_NORMAL:
1354                 cmd_len = iwl_fill_probe_req(priv,
1355                                         (struct ieee80211_mgmt *)scan->data,
1356                                         vif->addr,
1357                                         priv->scan_request->ie,
1358                                         priv->scan_request->ie_len,
1359                                         IWL_MAX_SCAN_SIZE - sizeof(*scan));
1360                 break;
1361         case IWL_SCAN_RADIO_RESET:
1362                 /* use bcast addr, will not be transmitted but must be valid */
1363                 cmd_len = iwl_fill_probe_req(priv,
1364                                         (struct ieee80211_mgmt *)scan->data,
1365                                         iwl_bcast_addr, NULL, 0,
1366                                         IWL_MAX_SCAN_SIZE - sizeof(*scan));
1367                 break;
1368         case IWL_SCAN_OFFCH_TX:
1369                 cmd_len = iwl_fill_offch_tx(priv, scan->data,
1370                                             IWL_MAX_SCAN_SIZE
1371                                              - sizeof(*scan)
1372                                              - sizeof(struct iwl_scan_channel));
1373                 scan->scan_flags |= IWL_SCAN_FLAGS_ACTION_FRAME_TX;
1374                 break;
1375         default:
1376                 BUG();
1377         }
1378         scan->tx_cmd.len = cpu_to_le16(cmd_len);
1379
1380         scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
1381                                RXON_FILTER_BCON_AWARE_MSK);
1382
1383         switch (priv->scan_type) {
1384         case IWL_SCAN_RADIO_RESET:
1385                 scan->channel_count =
1386                         iwl_get_single_channel_for_scan(priv, vif, band,
1387                                 (void *)&scan->data[cmd_len]);
1388                 break;
1389         case IWL_SCAN_NORMAL:
1390                 scan->channel_count =
1391                         iwl_get_channels_for_scan(priv, vif, band,
1392                                 is_active, n_probes,
1393                                 (void *)&scan->data[cmd_len]);
1394                 break;
1395         case IWL_SCAN_OFFCH_TX: {
1396                 struct iwl_scan_channel *scan_ch;
1397
1398                 scan->channel_count = 1;
1399
1400                 scan_ch = (void *)&scan->data[cmd_len];
1401                 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
1402                 scan_ch->channel =
1403                         cpu_to_le16(priv->_agn.offchan_tx_chan->hw_value);
1404                 scan_ch->active_dwell =
1405                         cpu_to_le16(priv->_agn.offchan_tx_timeout);
1406                 scan_ch->passive_dwell = 0;
1407
1408                 /* Set txpower levels to defaults */
1409                 scan_ch->dsp_atten = 110;
1410
1411                 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
1412                  * power level:
1413                  * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
1414                  */
1415                 if (priv->_agn.offchan_tx_chan->band == IEEE80211_BAND_5GHZ)
1416                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
1417                 else
1418                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
1419                 }
1420                 break;
1421         }
1422
1423         if (scan->channel_count == 0) {
1424                 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
1425                 return -EIO;
1426         }
1427
1428         cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
1429             scan->channel_count * sizeof(struct iwl_scan_channel);
1430         cmd.data[0] = scan;
1431         cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
1432         scan->len = cpu_to_le16(cmd.len[0]);
1433
1434         /* set scan bit here for PAN params */
1435         set_bit(STATUS_SCAN_HW, &priv->status);
1436
1437         if (priv->cfg->ops->hcmd->set_pan_params) {
1438                 ret = priv->cfg->ops->hcmd->set_pan_params(priv);
1439                 if (ret)
1440                         return ret;
1441         }
1442
1443         ret = iwl_send_cmd_sync(priv, &cmd);
1444         if (ret) {
1445                 clear_bit(STATUS_SCAN_HW, &priv->status);
1446                 if (priv->cfg->ops->hcmd->set_pan_params)
1447                         priv->cfg->ops->hcmd->set_pan_params(priv);
1448         }
1449
1450         return ret;
1451 }
1452
1453 int iwlagn_manage_ibss_station(struct iwl_priv *priv,
1454                                struct ieee80211_vif *vif, bool add)
1455 {
1456         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1457
1458         if (add)
1459                 return iwlagn_add_bssid_station(priv, vif_priv->ctx,
1460                                                 vif->bss_conf.bssid,
1461                                                 &vif_priv->ibss_bssid_sta_id);
1462         return iwl_remove_station(priv, vif_priv->ibss_bssid_sta_id,
1463                                   vif->bss_conf.bssid);
1464 }
1465
1466 void iwl_free_tfds_in_queue(struct iwl_priv *priv,
1467                             int sta_id, int tid, int freed)
1468 {
1469         lockdep_assert_held(&priv->sta_lock);
1470
1471         if (priv->stations[sta_id].tid[tid].tfds_in_queue >= freed)
1472                 priv->stations[sta_id].tid[tid].tfds_in_queue -= freed;
1473         else {
1474                 IWL_DEBUG_TX(priv, "free more than tfds_in_queue (%u:%d)\n",
1475                         priv->stations[sta_id].tid[tid].tfds_in_queue,
1476                         freed);
1477                 priv->stations[sta_id].tid[tid].tfds_in_queue = 0;
1478         }
1479 }
1480
1481 #define IWL_FLUSH_WAIT_MS       2000
1482
1483 int iwlagn_wait_tx_queue_empty(struct iwl_priv *priv)
1484 {
1485         struct iwl_tx_queue *txq;
1486         struct iwl_queue *q;
1487         int cnt;
1488         unsigned long now = jiffies;
1489         int ret = 0;
1490
1491         /* waiting for all the tx frames complete might take a while */
1492         for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
1493                 if (cnt == priv->cmd_queue)
1494                         continue;
1495                 txq = &priv->txq[cnt];
1496                 q = &txq->q;
1497                 while (q->read_ptr != q->write_ptr && !time_after(jiffies,
1498                        now + msecs_to_jiffies(IWL_FLUSH_WAIT_MS)))
1499                                 msleep(1);
1500
1501                 if (q->read_ptr != q->write_ptr) {
1502                         IWL_ERR(priv, "fail to flush all tx fifo queues\n");
1503                         ret = -ETIMEDOUT;
1504                         break;
1505                 }
1506         }
1507         return ret;
1508 }
1509
1510 #define IWL_TX_QUEUE_MSK        0xfffff
1511
1512 /**
1513  * iwlagn_txfifo_flush: send REPLY_TXFIFO_FLUSH command to uCode
1514  *
1515  * pre-requirements:
1516  *  1. acquire mutex before calling
1517  *  2. make sure rf is on and not in exit state
1518  */
1519 int iwlagn_txfifo_flush(struct iwl_priv *priv, u16 flush_control)
1520 {
1521         struct iwl_txfifo_flush_cmd flush_cmd;
1522         struct iwl_host_cmd cmd = {
1523                 .id = REPLY_TXFIFO_FLUSH,
1524                 .len = { sizeof(struct iwl_txfifo_flush_cmd), },
1525                 .flags = CMD_SYNC,
1526                 .data = { &flush_cmd, },
1527         };
1528
1529         might_sleep();
1530
1531         memset(&flush_cmd, 0, sizeof(flush_cmd));
1532         flush_cmd.fifo_control = IWL_TX_FIFO_VO_MSK | IWL_TX_FIFO_VI_MSK |
1533                                  IWL_TX_FIFO_BE_MSK | IWL_TX_FIFO_BK_MSK;
1534         if (priv->cfg->sku & IWL_SKU_N)
1535                 flush_cmd.fifo_control |= IWL_AGG_TX_QUEUE_MSK;
1536
1537         IWL_DEBUG_INFO(priv, "fifo queue control: 0X%x\n",
1538                        flush_cmd.fifo_control);
1539         flush_cmd.flush_control = cpu_to_le16(flush_control);
1540
1541         return iwl_send_cmd(priv, &cmd);
1542 }
1543
1544 void iwlagn_dev_txfifo_flush(struct iwl_priv *priv, u16 flush_control)
1545 {
1546         mutex_lock(&priv->mutex);
1547         ieee80211_stop_queues(priv->hw);
1548         if (priv->cfg->ops->lib->txfifo_flush(priv, IWL_DROP_ALL)) {
1549                 IWL_ERR(priv, "flush request fail\n");
1550                 goto done;
1551         }
1552         IWL_DEBUG_INFO(priv, "wait transmit/flush all frames\n");
1553         iwlagn_wait_tx_queue_empty(priv);
1554 done:
1555         ieee80211_wake_queues(priv->hw);
1556         mutex_unlock(&priv->mutex);
1557 }
1558
1559 /*
1560  * BT coex
1561  */
1562 /*
1563  * Macros to access the lookup table.
1564  *
1565  * The lookup table has 7 inputs: bt3_prio, bt3_txrx, bt_rf_act, wifi_req,
1566 * wifi_prio, wifi_txrx and wifi_sh_ant_req.
1567  *
1568  * It has three outputs: WLAN_ACTIVE, WLAN_KILL and ANT_SWITCH
1569  *
1570  * The format is that "registers" 8 through 11 contain the WLAN_ACTIVE bits
1571  * one after another in 32-bit registers, and "registers" 0 through 7 contain
1572  * the WLAN_KILL and ANT_SWITCH bits interleaved (in that order).
1573  *
1574  * These macros encode that format.
1575  */
1576 #define LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, wifi_req, wifi_prio, \
1577                   wifi_txrx, wifi_sh_ant_req) \
1578         (bt3_prio | (bt3_txrx << 1) | (bt_rf_act << 2) | (wifi_req << 3) | \
1579         (wifi_prio << 4) | (wifi_txrx << 5) | (wifi_sh_ant_req << 6))
1580
1581 #define LUT_PTA_WLAN_ACTIVE_OP(lut, op, val) \
1582         lut[8 + ((val) >> 5)] op (cpu_to_le32(BIT((val) & 0x1f)))
1583 #define LUT_TEST_PTA_WLAN_ACTIVE(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1584                                  wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1585         (!!(LUT_PTA_WLAN_ACTIVE_OP(lut, &, LUT_VALUE(bt3_prio, bt3_txrx, \
1586                                    bt_rf_act, wifi_req, wifi_prio, wifi_txrx, \
1587                                    wifi_sh_ant_req))))
1588 #define LUT_SET_PTA_WLAN_ACTIVE(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1589                                 wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1590         LUT_PTA_WLAN_ACTIVE_OP(lut, |=, LUT_VALUE(bt3_prio, bt3_txrx, \
1591                                bt_rf_act, wifi_req, wifi_prio, wifi_txrx, \
1592                                wifi_sh_ant_req))
1593 #define LUT_CLEAR_PTA_WLAN_ACTIVE(lut, bt3_prio, bt3_txrx, bt_rf_act, \
1594                                   wifi_req, wifi_prio, wifi_txrx, \
1595                                   wifi_sh_ant_req) \
1596         LUT_PTA_WLAN_ACTIVE_OP(lut, &= ~, LUT_VALUE(bt3_prio, bt3_txrx, \
1597                                bt_rf_act, wifi_req, wifi_prio, wifi_txrx, \
1598                                wifi_sh_ant_req))
1599
1600 #define LUT_WLAN_KILL_OP(lut, op, val) \
1601         lut[(val) >> 4] op (cpu_to_le32(BIT(((val) << 1) & 0x1e)))
1602 #define LUT_TEST_WLAN_KILL(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1603                            wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1604         (!!(LUT_WLAN_KILL_OP(lut, &, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
1605                              wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))))
1606 #define LUT_SET_WLAN_KILL(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1607                           wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1608         LUT_WLAN_KILL_OP(lut, |=, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
1609                          wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))
1610 #define LUT_CLEAR_WLAN_KILL(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1611                             wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1612         LUT_WLAN_KILL_OP(lut, &= ~, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
1613                          wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))
1614
1615 #define LUT_ANT_SWITCH_OP(lut, op, val) \
1616         lut[(val) >> 4] op (cpu_to_le32(BIT((((val) << 1) & 0x1e) + 1)))
1617 #define LUT_TEST_ANT_SWITCH(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1618                             wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1619         (!!(LUT_ANT_SWITCH_OP(lut, &, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
1620                               wifi_req, wifi_prio, wifi_txrx, \
1621                               wifi_sh_ant_req))))
1622 #define LUT_SET_ANT_SWITCH(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1623                            wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1624         LUT_ANT_SWITCH_OP(lut, |=, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
1625                           wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))
1626 #define LUT_CLEAR_ANT_SWITCH(lut, bt3_prio, bt3_txrx, bt_rf_act, wifi_req, \
1627                              wifi_prio, wifi_txrx, wifi_sh_ant_req) \
1628         LUT_ANT_SWITCH_OP(lut, &= ~, LUT_VALUE(bt3_prio, bt3_txrx, bt_rf_act, \
1629                           wifi_req, wifi_prio, wifi_txrx, wifi_sh_ant_req))
1630
1631 static const __le32 iwlagn_def_3w_lookup[12] = {
1632         cpu_to_le32(0xaaaaaaaa),
1633         cpu_to_le32(0xaaaaaaaa),
1634         cpu_to_le32(0xaeaaaaaa),
1635         cpu_to_le32(0xaaaaaaaa),
1636         cpu_to_le32(0xcc00ff28),
1637         cpu_to_le32(0x0000aaaa),
1638         cpu_to_le32(0xcc00aaaa),
1639         cpu_to_le32(0x0000aaaa),
1640         cpu_to_le32(0xc0004000),
1641         cpu_to_le32(0x00004000),
1642         cpu_to_le32(0xf0005000),
1643         cpu_to_le32(0xf0005000),
1644 };
1645
1646 static const __le32 iwlagn_concurrent_lookup[12] = {
1647         cpu_to_le32(0xaaaaaaaa),
1648         cpu_to_le32(0xaaaaaaaa),
1649         cpu_to_le32(0xaaaaaaaa),
1650         cpu_to_le32(0xaaaaaaaa),
1651         cpu_to_le32(0xaaaaaaaa),
1652         cpu_to_le32(0xaaaaaaaa),
1653         cpu_to_le32(0xaaaaaaaa),
1654         cpu_to_le32(0xaaaaaaaa),
1655         cpu_to_le32(0x00000000),
1656         cpu_to_le32(0x00000000),
1657         cpu_to_le32(0x00000000),
1658         cpu_to_le32(0x00000000),
1659 };
1660
1661 void iwlagn_send_advance_bt_config(struct iwl_priv *priv)
1662 {
1663         struct iwl_basic_bt_cmd basic = {
1664                 .max_kill = IWLAGN_BT_MAX_KILL_DEFAULT,
1665                 .bt3_timer_t7_value = IWLAGN_BT3_T7_DEFAULT,
1666                 .bt3_prio_sample_time = IWLAGN_BT3_PRIO_SAMPLE_DEFAULT,
1667                 .bt3_timer_t2_value = IWLAGN_BT3_T2_DEFAULT,
1668         };
1669         struct iwl6000_bt_cmd bt_cmd_6000;
1670         struct iwl2000_bt_cmd bt_cmd_2000;
1671         int ret;
1672
1673         BUILD_BUG_ON(sizeof(iwlagn_def_3w_lookup) !=
1674                         sizeof(basic.bt3_lookup_table));
1675
1676         if (priv->cfg->bt_params) {
1677                 if (priv->cfg->bt_params->bt_session_2) {
1678                         bt_cmd_2000.prio_boost = cpu_to_le32(
1679                                 priv->cfg->bt_params->bt_prio_boost);
1680                         bt_cmd_2000.tx_prio_boost = 0;
1681                         bt_cmd_2000.rx_prio_boost = 0;
1682                 } else {
1683                         bt_cmd_6000.prio_boost =
1684                                 priv->cfg->bt_params->bt_prio_boost;
1685                         bt_cmd_6000.tx_prio_boost = 0;
1686                         bt_cmd_6000.rx_prio_boost = 0;
1687                 }
1688         } else {
1689                 IWL_ERR(priv, "failed to construct BT Coex Config\n");
1690                 return;
1691         }
1692
1693         basic.kill_ack_mask = priv->kill_ack_mask;
1694         basic.kill_cts_mask = priv->kill_cts_mask;
1695         basic.valid = priv->bt_valid;
1696
1697         /*
1698          * Configure BT coex mode to "no coexistence" when the
1699          * user disabled BT coexistence, we have no interface
1700          * (might be in monitor mode), or the interface is in
1701          * IBSS mode (no proper uCode support for coex then).
1702          */
1703         if (!iwlagn_mod_params.bt_coex_active ||
1704             priv->iw_mode == NL80211_IFTYPE_ADHOC) {
1705                 basic.flags = IWLAGN_BT_FLAG_COEX_MODE_DISABLED;
1706         } else {
1707                 basic.flags = IWLAGN_BT_FLAG_COEX_MODE_3W <<
1708                                         IWLAGN_BT_FLAG_COEX_MODE_SHIFT;
1709                 if (priv->cfg->bt_params &&
1710                     priv->cfg->bt_params->bt_sco_disable)
1711                         basic.flags |= IWLAGN_BT_FLAG_SYNC_2_BT_DISABLE;
1712
1713                 if (priv->bt_ch_announce)
1714                         basic.flags |= IWLAGN_BT_FLAG_CHANNEL_INHIBITION;
1715                 IWL_DEBUG_INFO(priv, "BT coex flag: 0X%x\n", basic.flags);
1716         }
1717         priv->bt_enable_flag = basic.flags;
1718         if (priv->bt_full_concurrent)
1719                 memcpy(basic.bt3_lookup_table, iwlagn_concurrent_lookup,
1720                         sizeof(iwlagn_concurrent_lookup));
1721         else
1722                 memcpy(basic.bt3_lookup_table, iwlagn_def_3w_lookup,
1723                         sizeof(iwlagn_def_3w_lookup));
1724
1725         IWL_DEBUG_INFO(priv, "BT coex %s in %s mode\n",
1726                        basic.flags ? "active" : "disabled",
1727                        priv->bt_full_concurrent ?
1728                        "full concurrency" : "3-wire");
1729
1730         if (priv->cfg->bt_params->bt_session_2) {
1731                 memcpy(&bt_cmd_2000.basic, &basic,
1732                         sizeof(basic));
1733                 ret = iwl_send_cmd_pdu(priv, REPLY_BT_CONFIG,
1734                         sizeof(bt_cmd_2000), &bt_cmd_2000);
1735         } else {
1736                 memcpy(&bt_cmd_6000.basic, &basic,
1737                         sizeof(basic));
1738                 ret = iwl_send_cmd_pdu(priv, REPLY_BT_CONFIG,
1739                         sizeof(bt_cmd_6000), &bt_cmd_6000);
1740         }
1741         if (ret)
1742                 IWL_ERR(priv, "failed to send BT Coex Config\n");
1743
1744 }
1745
1746 static void iwlagn_bt_traffic_change_work(struct work_struct *work)
1747 {
1748         struct iwl_priv *priv =
1749                 container_of(work, struct iwl_priv, bt_traffic_change_work);
1750         struct iwl_rxon_context *ctx;
1751         int smps_request = -1;
1752
1753         if (priv->bt_enable_flag == IWLAGN_BT_FLAG_COEX_MODE_DISABLED) {
1754                 /* bt coex disabled */
1755                 return;
1756         }
1757
1758         /*
1759          * Note: bt_traffic_load can be overridden by scan complete and
1760          * coex profile notifications. Ignore that since only bad consequence
1761          * can be not matching debug print with actual state.
1762          */
1763         IWL_DEBUG_INFO(priv, "BT traffic load changes: %d\n",
1764                        priv->bt_traffic_load);
1765
1766         switch (priv->bt_traffic_load) {
1767         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1768                 if (priv->bt_status)
1769                         smps_request = IEEE80211_SMPS_DYNAMIC;
1770                 else
1771                         smps_request = IEEE80211_SMPS_AUTOMATIC;
1772                 break;
1773         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1774                 smps_request = IEEE80211_SMPS_DYNAMIC;
1775                 break;
1776         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1777         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1778                 smps_request = IEEE80211_SMPS_STATIC;
1779                 break;
1780         default:
1781                 IWL_ERR(priv, "Invalid BT traffic load: %d\n",
1782                         priv->bt_traffic_load);
1783                 break;
1784         }
1785
1786         mutex_lock(&priv->mutex);
1787
1788         /*
1789          * We can not send command to firmware while scanning. When the scan
1790          * complete we will schedule this work again. We do check with mutex
1791          * locked to prevent new scan request to arrive. We do not check
1792          * STATUS_SCANNING to avoid race when queue_work two times from
1793          * different notifications, but quit and not perform any work at all.
1794          */
1795         if (test_bit(STATUS_SCAN_HW, &priv->status))
1796                 goto out;
1797
1798         if (priv->cfg->ops->lib->update_chain_flags)
1799                 priv->cfg->ops->lib->update_chain_flags(priv);
1800
1801         if (smps_request != -1) {
1802                 priv->current_ht_config.smps = smps_request;
1803                 for_each_context(priv, ctx) {
1804                         if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION)
1805                                 ieee80211_request_smps(ctx->vif, smps_request);
1806                 }
1807         }
1808 out:
1809         mutex_unlock(&priv->mutex);
1810 }
1811
1812 static void iwlagn_print_uartmsg(struct iwl_priv *priv,
1813                                 struct iwl_bt_uart_msg *uart_msg)
1814 {
1815         IWL_DEBUG_NOTIF(priv, "Message Type = 0x%X, SSN = 0x%X, "
1816                         "Update Req = 0x%X",
1817                 (BT_UART_MSG_FRAME1MSGTYPE_MSK & uart_msg->frame1) >>
1818                         BT_UART_MSG_FRAME1MSGTYPE_POS,
1819                 (BT_UART_MSG_FRAME1SSN_MSK & uart_msg->frame1) >>
1820                         BT_UART_MSG_FRAME1SSN_POS,
1821                 (BT_UART_MSG_FRAME1UPDATEREQ_MSK & uart_msg->frame1) >>
1822                         BT_UART_MSG_FRAME1UPDATEREQ_POS);
1823
1824         IWL_DEBUG_NOTIF(priv, "Open connections = 0x%X, Traffic load = 0x%X, "
1825                         "Chl_SeqN = 0x%X, In band = 0x%X",
1826                 (BT_UART_MSG_FRAME2OPENCONNECTIONS_MSK & uart_msg->frame2) >>
1827                         BT_UART_MSG_FRAME2OPENCONNECTIONS_POS,
1828                 (BT_UART_MSG_FRAME2TRAFFICLOAD_MSK & uart_msg->frame2) >>
1829                         BT_UART_MSG_FRAME2TRAFFICLOAD_POS,
1830                 (BT_UART_MSG_FRAME2CHLSEQN_MSK & uart_msg->frame2) >>
1831                         BT_UART_MSG_FRAME2CHLSEQN_POS,
1832                 (BT_UART_MSG_FRAME2INBAND_MSK & uart_msg->frame2) >>
1833                         BT_UART_MSG_FRAME2INBAND_POS);
1834
1835         IWL_DEBUG_NOTIF(priv, "SCO/eSCO = 0x%X, Sniff = 0x%X, A2DP = 0x%X, "
1836                         "ACL = 0x%X, Master = 0x%X, OBEX = 0x%X",
1837                 (BT_UART_MSG_FRAME3SCOESCO_MSK & uart_msg->frame3) >>
1838                         BT_UART_MSG_FRAME3SCOESCO_POS,
1839                 (BT_UART_MSG_FRAME3SNIFF_MSK & uart_msg->frame3) >>
1840                         BT_UART_MSG_FRAME3SNIFF_POS,
1841                 (BT_UART_MSG_FRAME3A2DP_MSK & uart_msg->frame3) >>
1842                         BT_UART_MSG_FRAME3A2DP_POS,
1843                 (BT_UART_MSG_FRAME3ACL_MSK & uart_msg->frame3) >>
1844                         BT_UART_MSG_FRAME3ACL_POS,
1845                 (BT_UART_MSG_FRAME3MASTER_MSK & uart_msg->frame3) >>
1846                         BT_UART_MSG_FRAME3MASTER_POS,
1847                 (BT_UART_MSG_FRAME3OBEX_MSK & uart_msg->frame3) >>
1848                         BT_UART_MSG_FRAME3OBEX_POS);
1849
1850         IWL_DEBUG_NOTIF(priv, "Idle duration = 0x%X",
1851                 (BT_UART_MSG_FRAME4IDLEDURATION_MSK & uart_msg->frame4) >>
1852                         BT_UART_MSG_FRAME4IDLEDURATION_POS);
1853
1854         IWL_DEBUG_NOTIF(priv, "Tx Activity = 0x%X, Rx Activity = 0x%X, "
1855                         "eSCO Retransmissions = 0x%X",
1856                 (BT_UART_MSG_FRAME5TXACTIVITY_MSK & uart_msg->frame5) >>
1857                         BT_UART_MSG_FRAME5TXACTIVITY_POS,
1858                 (BT_UART_MSG_FRAME5RXACTIVITY_MSK & uart_msg->frame5) >>
1859                         BT_UART_MSG_FRAME5RXACTIVITY_POS,
1860                 (BT_UART_MSG_FRAME5ESCORETRANSMIT_MSK & uart_msg->frame5) >>
1861                         BT_UART_MSG_FRAME5ESCORETRANSMIT_POS);
1862
1863         IWL_DEBUG_NOTIF(priv, "Sniff Interval = 0x%X, Discoverable = 0x%X",
1864                 (BT_UART_MSG_FRAME6SNIFFINTERVAL_MSK & uart_msg->frame6) >>
1865                         BT_UART_MSG_FRAME6SNIFFINTERVAL_POS,
1866                 (BT_UART_MSG_FRAME6DISCOVERABLE_MSK & uart_msg->frame6) >>
1867                         BT_UART_MSG_FRAME6DISCOVERABLE_POS);
1868
1869         IWL_DEBUG_NOTIF(priv, "Sniff Activity = 0x%X, Page = "
1870                         "0x%X, Inquiry = 0x%X, Connectable = 0x%X",
1871                 (BT_UART_MSG_FRAME7SNIFFACTIVITY_MSK & uart_msg->frame7) >>
1872                         BT_UART_MSG_FRAME7SNIFFACTIVITY_POS,
1873                 (BT_UART_MSG_FRAME7PAGE_MSK & uart_msg->frame7) >>
1874                         BT_UART_MSG_FRAME7PAGE_POS,
1875                 (BT_UART_MSG_FRAME7INQUIRY_MSK & uart_msg->frame7) >>
1876                         BT_UART_MSG_FRAME7INQUIRY_POS,
1877                 (BT_UART_MSG_FRAME7CONNECTABLE_MSK & uart_msg->frame7) >>
1878                         BT_UART_MSG_FRAME7CONNECTABLE_POS);
1879 }
1880
1881 static void iwlagn_set_kill_msk(struct iwl_priv *priv,
1882                                 struct iwl_bt_uart_msg *uart_msg)
1883 {
1884         u8 kill_msk;
1885         static const __le32 bt_kill_ack_msg[2] = {
1886                 IWLAGN_BT_KILL_ACK_MASK_DEFAULT,
1887                 IWLAGN_BT_KILL_ACK_CTS_MASK_SCO };
1888         static const __le32 bt_kill_cts_msg[2] = {
1889                 IWLAGN_BT_KILL_CTS_MASK_DEFAULT,
1890                 IWLAGN_BT_KILL_ACK_CTS_MASK_SCO };
1891
1892         kill_msk = (BT_UART_MSG_FRAME3SCOESCO_MSK & uart_msg->frame3)
1893                 ? 1 : 0;
1894         if (priv->kill_ack_mask != bt_kill_ack_msg[kill_msk] ||
1895             priv->kill_cts_mask != bt_kill_cts_msg[kill_msk]) {
1896                 priv->bt_valid |= IWLAGN_BT_VALID_KILL_ACK_MASK;
1897                 priv->kill_ack_mask = bt_kill_ack_msg[kill_msk];
1898                 priv->bt_valid |= IWLAGN_BT_VALID_KILL_CTS_MASK;
1899                 priv->kill_cts_mask = bt_kill_cts_msg[kill_msk];
1900
1901                 /* schedule to send runtime bt_config */
1902                 queue_work(priv->workqueue, &priv->bt_runtime_config);
1903         }
1904 }
1905
1906 void iwlagn_bt_coex_profile_notif(struct iwl_priv *priv,
1907                                              struct iwl_rx_mem_buffer *rxb)
1908 {
1909         unsigned long flags;
1910         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1911         struct iwl_bt_coex_profile_notif *coex = &pkt->u.bt_coex_profile_notif;
1912         struct iwl_bt_uart_msg *uart_msg = &coex->last_bt_uart_msg;
1913
1914         if (priv->bt_enable_flag == IWLAGN_BT_FLAG_COEX_MODE_DISABLED) {
1915                 /* bt coex disabled */
1916                 return;
1917         }
1918
1919         IWL_DEBUG_NOTIF(priv, "BT Coex notification:\n");
1920         IWL_DEBUG_NOTIF(priv, "    status: %d\n", coex->bt_status);
1921         IWL_DEBUG_NOTIF(priv, "    traffic load: %d\n", coex->bt_traffic_load);
1922         IWL_DEBUG_NOTIF(priv, "    CI compliance: %d\n",
1923                         coex->bt_ci_compliance);
1924         iwlagn_print_uartmsg(priv, uart_msg);
1925
1926         priv->last_bt_traffic_load = priv->bt_traffic_load;
1927         if (priv->iw_mode != NL80211_IFTYPE_ADHOC) {
1928                 if (priv->bt_status != coex->bt_status ||
1929                     priv->last_bt_traffic_load != coex->bt_traffic_load) {
1930                         if (coex->bt_status) {
1931                                 /* BT on */
1932                                 if (!priv->bt_ch_announce)
1933                                         priv->bt_traffic_load =
1934                                                 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
1935                                 else
1936                                         priv->bt_traffic_load =
1937                                                 coex->bt_traffic_load;
1938                         } else {
1939                                 /* BT off */
1940                                 priv->bt_traffic_load =
1941                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE;
1942                         }
1943                         priv->bt_status = coex->bt_status;
1944                         queue_work(priv->workqueue,
1945                                    &priv->bt_traffic_change_work);
1946                 }
1947         }
1948
1949         iwlagn_set_kill_msk(priv, uart_msg);
1950
1951         /* FIXME: based on notification, adjust the prio_boost */
1952
1953         spin_lock_irqsave(&priv->lock, flags);
1954         priv->bt_ci_compliance = coex->bt_ci_compliance;
1955         spin_unlock_irqrestore(&priv->lock, flags);
1956 }
1957
1958 void iwlagn_bt_rx_handler_setup(struct iwl_priv *priv)
1959 {
1960         iwlagn_rx_handler_setup(priv);
1961         priv->rx_handlers[REPLY_BT_COEX_PROFILE_NOTIF] =
1962                 iwlagn_bt_coex_profile_notif;
1963 }
1964
1965 void iwlagn_bt_setup_deferred_work(struct iwl_priv *priv)
1966 {
1967         iwlagn_setup_deferred_work(priv);
1968
1969         INIT_WORK(&priv->bt_traffic_change_work,
1970                   iwlagn_bt_traffic_change_work);
1971 }
1972
1973 void iwlagn_bt_cancel_deferred_work(struct iwl_priv *priv)
1974 {
1975         cancel_work_sync(&priv->bt_traffic_change_work);
1976 }
1977
1978 static bool is_single_rx_stream(struct iwl_priv *priv)
1979 {
1980         return priv->current_ht_config.smps == IEEE80211_SMPS_STATIC ||
1981                priv->current_ht_config.single_chain_sufficient;
1982 }
1983
1984 #define IWL_NUM_RX_CHAINS_MULTIPLE      3
1985 #define IWL_NUM_RX_CHAINS_SINGLE        2
1986 #define IWL_NUM_IDLE_CHAINS_DUAL        2
1987 #define IWL_NUM_IDLE_CHAINS_SINGLE      1
1988
1989 /*
1990  * Determine how many receiver/antenna chains to use.
1991  *
1992  * More provides better reception via diversity.  Fewer saves power
1993  * at the expense of throughput, but only when not in powersave to
1994  * start with.
1995  *
1996  * MIMO (dual stream) requires at least 2, but works better with 3.
1997  * This does not determine *which* chains to use, just how many.
1998  */
1999 static int iwl_get_active_rx_chain_count(struct iwl_priv *priv)
2000 {
2001         if (priv->cfg->bt_params &&
2002             priv->cfg->bt_params->advanced_bt_coexist &&
2003             (priv->bt_full_concurrent ||
2004              priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)) {
2005                 /*
2006                  * only use chain 'A' in bt high traffic load or
2007                  * full concurrency mode
2008                  */
2009                 return IWL_NUM_RX_CHAINS_SINGLE;
2010         }
2011         /* # of Rx chains to use when expecting MIMO. */
2012         if (is_single_rx_stream(priv))
2013                 return IWL_NUM_RX_CHAINS_SINGLE;
2014         else
2015                 return IWL_NUM_RX_CHAINS_MULTIPLE;
2016 }
2017
2018 /*
2019  * When we are in power saving mode, unless device support spatial
2020  * multiplexing power save, use the active count for rx chain count.
2021  */
2022 static int iwl_get_idle_rx_chain_count(struct iwl_priv *priv, int active_cnt)
2023 {
2024         /* # Rx chains when idling, depending on SMPS mode */
2025         switch (priv->current_ht_config.smps) {
2026         case IEEE80211_SMPS_STATIC:
2027         case IEEE80211_SMPS_DYNAMIC:
2028                 return IWL_NUM_IDLE_CHAINS_SINGLE;
2029         case IEEE80211_SMPS_OFF:
2030                 return active_cnt;
2031         default:
2032                 WARN(1, "invalid SMPS mode %d",
2033                      priv->current_ht_config.smps);
2034                 return active_cnt;
2035         }
2036 }
2037
2038 /* up to 4 chains */
2039 static u8 iwl_count_chain_bitmap(u32 chain_bitmap)
2040 {
2041         u8 res;
2042         res = (chain_bitmap & BIT(0)) >> 0;
2043         res += (chain_bitmap & BIT(1)) >> 1;
2044         res += (chain_bitmap & BIT(2)) >> 2;
2045         res += (chain_bitmap & BIT(3)) >> 3;
2046         return res;
2047 }
2048
2049 /**
2050  * iwlagn_set_rxon_chain - Set up Rx chain usage in "staging" RXON image
2051  *
2052  * Selects how many and which Rx receivers/antennas/chains to use.
2053  * This should not be used for scan command ... it puts data in wrong place.
2054  */
2055 void iwlagn_set_rxon_chain(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
2056 {
2057         bool is_single = is_single_rx_stream(priv);
2058         bool is_cam = !test_bit(STATUS_POWER_PMI, &priv->status);
2059         u8 idle_rx_cnt, active_rx_cnt, valid_rx_cnt;
2060         u32 active_chains;
2061         u16 rx_chain;
2062
2063         /* Tell uCode which antennas are actually connected.
2064          * Before first association, we assume all antennas are connected.
2065          * Just after first association, iwl_chain_noise_calibration()
2066          *    checks which antennas actually *are* connected. */
2067         if (priv->chain_noise_data.active_chains)
2068                 active_chains = priv->chain_noise_data.active_chains;
2069         else
2070                 active_chains = priv->hw_params.valid_rx_ant;
2071
2072         if (priv->cfg->bt_params &&
2073             priv->cfg->bt_params->advanced_bt_coexist &&
2074             (priv->bt_full_concurrent ||
2075              priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)) {
2076                 /*
2077                  * only use chain 'A' in bt high traffic load or
2078                  * full concurrency mode
2079                  */
2080                 active_chains = first_antenna(active_chains);
2081         }
2082
2083         rx_chain = active_chains << RXON_RX_CHAIN_VALID_POS;
2084
2085         /* How many receivers should we use? */
2086         active_rx_cnt = iwl_get_active_rx_chain_count(priv);
2087         idle_rx_cnt = iwl_get_idle_rx_chain_count(priv, active_rx_cnt);
2088
2089
2090         /* correct rx chain count according hw settings
2091          * and chain noise calibration
2092          */
2093         valid_rx_cnt = iwl_count_chain_bitmap(active_chains);
2094         if (valid_rx_cnt < active_rx_cnt)
2095                 active_rx_cnt = valid_rx_cnt;
2096
2097         if (valid_rx_cnt < idle_rx_cnt)
2098                 idle_rx_cnt = valid_rx_cnt;
2099
2100         rx_chain |= active_rx_cnt << RXON_RX_CHAIN_MIMO_CNT_POS;
2101         rx_chain |= idle_rx_cnt  << RXON_RX_CHAIN_CNT_POS;
2102
2103         ctx->staging.rx_chain = cpu_to_le16(rx_chain);
2104
2105         if (!is_single && (active_rx_cnt >= IWL_NUM_RX_CHAINS_SINGLE) && is_cam)
2106                 ctx->staging.rx_chain |= RXON_RX_CHAIN_MIMO_FORCE_MSK;
2107         else
2108                 ctx->staging.rx_chain &= ~RXON_RX_CHAIN_MIMO_FORCE_MSK;
2109
2110         IWL_DEBUG_ASSOC(priv, "rx_chain=0x%X active=%d idle=%d\n",
2111                         ctx->staging.rx_chain,
2112                         active_rx_cnt, idle_rx_cnt);
2113
2114         WARN_ON(active_rx_cnt == 0 || idle_rx_cnt == 0 ||
2115                 active_rx_cnt < idle_rx_cnt);
2116 }
2117
2118 u8 iwl_toggle_tx_ant(struct iwl_priv *priv, u8 ant, u8 valid)
2119 {
2120         int i;
2121         u8 ind = ant;
2122
2123         if (priv->band == IEEE80211_BAND_2GHZ &&
2124             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
2125                 return 0;
2126
2127         for (i = 0; i < RATE_ANT_NUM - 1; i++) {
2128                 ind = (ind + 1) < RATE_ANT_NUM ?  ind + 1 : 0;
2129                 if (valid & BIT(ind))
2130                         return ind;
2131         }
2132         return ant;
2133 }
2134
2135 static const char *get_csr_string(int cmd)
2136 {
2137         switch (cmd) {
2138         IWL_CMD(CSR_HW_IF_CONFIG_REG);
2139         IWL_CMD(CSR_INT_COALESCING);
2140         IWL_CMD(CSR_INT);
2141         IWL_CMD(CSR_INT_MASK);
2142         IWL_CMD(CSR_FH_INT_STATUS);
2143         IWL_CMD(CSR_GPIO_IN);
2144         IWL_CMD(CSR_RESET);
2145         IWL_CMD(CSR_GP_CNTRL);
2146         IWL_CMD(CSR_HW_REV);
2147         IWL_CMD(CSR_EEPROM_REG);
2148         IWL_CMD(CSR_EEPROM_GP);
2149         IWL_CMD(CSR_OTP_GP_REG);
2150         IWL_CMD(CSR_GIO_REG);
2151         IWL_CMD(CSR_GP_UCODE_REG);
2152         IWL_CMD(CSR_GP_DRIVER_REG);
2153         IWL_CMD(CSR_UCODE_DRV_GP1);
2154         IWL_CMD(CSR_UCODE_DRV_GP2);
2155         IWL_CMD(CSR_LED_REG);
2156         IWL_CMD(CSR_DRAM_INT_TBL_REG);
2157         IWL_CMD(CSR_GIO_CHICKEN_BITS);
2158         IWL_CMD(CSR_ANA_PLL_CFG);
2159         IWL_CMD(CSR_HW_REV_WA_REG);
2160         IWL_CMD(CSR_DBG_HPET_MEM_REG);
2161         default:
2162                 return "UNKNOWN";
2163         }
2164 }
2165
2166 void iwl_dump_csr(struct iwl_priv *priv)
2167 {
2168         int i;
2169         static const u32 csr_tbl[] = {
2170                 CSR_HW_IF_CONFIG_REG,
2171                 CSR_INT_COALESCING,
2172                 CSR_INT,
2173                 CSR_INT_MASK,
2174                 CSR_FH_INT_STATUS,
2175                 CSR_GPIO_IN,
2176                 CSR_RESET,
2177                 CSR_GP_CNTRL,
2178                 CSR_HW_REV,
2179                 CSR_EEPROM_REG,
2180                 CSR_EEPROM_GP,
2181                 CSR_OTP_GP_REG,
2182                 CSR_GIO_REG,
2183                 CSR_GP_UCODE_REG,
2184                 CSR_GP_DRIVER_REG,
2185                 CSR_UCODE_DRV_GP1,
2186                 CSR_UCODE_DRV_GP2,
2187                 CSR_LED_REG,
2188                 CSR_DRAM_INT_TBL_REG,
2189                 CSR_GIO_CHICKEN_BITS,
2190                 CSR_ANA_PLL_CFG,
2191                 CSR_HW_REV_WA_REG,
2192                 CSR_DBG_HPET_MEM_REG
2193         };
2194         IWL_ERR(priv, "CSR values:\n");
2195         IWL_ERR(priv, "(2nd byte of CSR_INT_COALESCING is "
2196                 "CSR_INT_PERIODIC_REG)\n");
2197         for (i = 0; i <  ARRAY_SIZE(csr_tbl); i++) {
2198                 IWL_ERR(priv, "  %25s: 0X%08x\n",
2199                         get_csr_string(csr_tbl[i]),
2200                         iwl_read32(priv, csr_tbl[i]));
2201         }
2202 }
2203
2204 static const char *get_fh_string(int cmd)
2205 {
2206         switch (cmd) {
2207         IWL_CMD(FH_RSCSR_CHNL0_STTS_WPTR_REG);
2208         IWL_CMD(FH_RSCSR_CHNL0_RBDCB_BASE_REG);
2209         IWL_CMD(FH_RSCSR_CHNL0_WPTR);
2210         IWL_CMD(FH_MEM_RCSR_CHNL0_CONFIG_REG);
2211         IWL_CMD(FH_MEM_RSSR_SHARED_CTRL_REG);
2212         IWL_CMD(FH_MEM_RSSR_RX_STATUS_REG);
2213         IWL_CMD(FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV);
2214         IWL_CMD(FH_TSSR_TX_STATUS_REG);
2215         IWL_CMD(FH_TSSR_TX_ERROR_REG);
2216         default:
2217                 return "UNKNOWN";
2218         }
2219 }
2220
2221 int iwl_dump_fh(struct iwl_priv *priv, char **buf, bool display)
2222 {
2223         int i;
2224 #ifdef CONFIG_IWLWIFI_DEBUG
2225         int pos = 0;
2226         size_t bufsz = 0;
2227 #endif
2228         static const u32 fh_tbl[] = {
2229                 FH_RSCSR_CHNL0_STTS_WPTR_REG,
2230                 FH_RSCSR_CHNL0_RBDCB_BASE_REG,
2231                 FH_RSCSR_CHNL0_WPTR,
2232                 FH_MEM_RCSR_CHNL0_CONFIG_REG,
2233                 FH_MEM_RSSR_SHARED_CTRL_REG,
2234                 FH_MEM_RSSR_RX_STATUS_REG,
2235                 FH_MEM_RSSR_RX_ENABLE_ERR_IRQ2DRV,
2236                 FH_TSSR_TX_STATUS_REG,
2237                 FH_TSSR_TX_ERROR_REG
2238         };
2239 #ifdef CONFIG_IWLWIFI_DEBUG
2240         if (display) {
2241                 bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
2242                 *buf = kmalloc(bufsz, GFP_KERNEL);
2243                 if (!*buf)
2244                         return -ENOMEM;
2245                 pos += scnprintf(*buf + pos, bufsz - pos,
2246                                 "FH register values:\n");
2247                 for (i = 0; i < ARRAY_SIZE(fh_tbl); i++) {
2248                         pos += scnprintf(*buf + pos, bufsz - pos,
2249                                 "  %34s: 0X%08x\n",
2250                                 get_fh_string(fh_tbl[i]),
2251                                 iwl_read_direct32(priv, fh_tbl[i]));
2252                 }
2253                 return pos;
2254         }
2255 #endif
2256         IWL_ERR(priv, "FH register values:\n");
2257         for (i = 0; i <  ARRAY_SIZE(fh_tbl); i++) {
2258                 IWL_ERR(priv, "  %34s: 0X%08x\n",
2259                         get_fh_string(fh_tbl[i]),
2260                         iwl_read_direct32(priv, fh_tbl[i]));
2261         }
2262         return 0;
2263 }
2264
2265 /* notification wait support */
2266 void iwlagn_init_notification_wait(struct iwl_priv *priv,
2267                                    struct iwl_notification_wait *wait_entry,
2268                                    u8 cmd,
2269                                    void (*fn)(struct iwl_priv *priv,
2270                                               struct iwl_rx_packet *pkt,
2271                                               void *data),
2272                                    void *fn_data)
2273 {
2274         wait_entry->fn = fn;
2275         wait_entry->fn_data = fn_data;
2276         wait_entry->cmd = cmd;
2277         wait_entry->triggered = false;
2278         wait_entry->aborted = false;
2279
2280         spin_lock_bh(&priv->_agn.notif_wait_lock);
2281         list_add(&wait_entry->list, &priv->_agn.notif_waits);
2282         spin_unlock_bh(&priv->_agn.notif_wait_lock);
2283 }
2284
2285 int iwlagn_wait_notification(struct iwl_priv *priv,
2286                              struct iwl_notification_wait *wait_entry,
2287                              unsigned long timeout)
2288 {
2289         int ret;
2290
2291         ret = wait_event_timeout(priv->_agn.notif_waitq,
2292                                  wait_entry->triggered || wait_entry->aborted,
2293                                  timeout);
2294
2295         spin_lock_bh(&priv->_agn.notif_wait_lock);
2296         list_del(&wait_entry->list);
2297         spin_unlock_bh(&priv->_agn.notif_wait_lock);
2298
2299         if (wait_entry->aborted)
2300                 return -EIO;
2301
2302         /* return value is always >= 0 */
2303         if (ret <= 0)
2304                 return -ETIMEDOUT;
2305         return 0;
2306 }
2307
2308 void iwlagn_remove_notification(struct iwl_priv *priv,
2309                                 struct iwl_notification_wait *wait_entry)
2310 {
2311         spin_lock_bh(&priv->_agn.notif_wait_lock);
2312         list_del(&wait_entry->list);
2313         spin_unlock_bh(&priv->_agn.notif_wait_lock);
2314 }
2315
2316 int iwlagn_start_device(struct iwl_priv *priv)
2317 {
2318         int ret;
2319
2320         if (iwl_prepare_card_hw(priv)) {
2321                 IWL_WARN(priv, "Exit HW not ready\n");
2322                 return -EIO;
2323         }
2324
2325         /* If platform's RF_KILL switch is NOT set to KILL */
2326         if (iwl_read32(priv, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW)
2327                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
2328         else
2329                 set_bit(STATUS_RF_KILL_HW, &priv->status);
2330
2331         if (iwl_is_rfkill(priv)) {
2332                 wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
2333                 iwl_enable_interrupts(priv);
2334                 return -ERFKILL;
2335         }
2336
2337         iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
2338
2339         ret = iwlagn_hw_nic_init(priv);
2340         if (ret) {
2341                 IWL_ERR(priv, "Unable to init nic\n");
2342                 return ret;
2343         }
2344
2345         /* make sure rfkill handshake bits are cleared */
2346         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
2347         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
2348                     CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
2349
2350         /* clear (again), then enable host interrupts */
2351         iwl_write32(priv, CSR_INT, 0xFFFFFFFF);
2352         iwl_enable_interrupts(priv);
2353
2354         /* really make sure rfkill handshake bits are cleared */
2355         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
2356         iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_SW_BIT_RFKILL);
2357
2358         return 0;
2359 }
2360
2361 void iwlagn_stop_device(struct iwl_priv *priv)
2362 {
2363         unsigned long flags;
2364
2365         /* stop and reset the on-board processor */
2366         iwl_write32(priv, CSR_RESET, CSR_RESET_REG_FLAG_NEVO_RESET);
2367
2368         /* tell the device to stop sending interrupts */
2369         spin_lock_irqsave(&priv->lock, flags);
2370         iwl_disable_interrupts(priv);
2371         spin_unlock_irqrestore(&priv->lock, flags);
2372         iwl_synchronize_irq(priv);
2373
2374         /* device going down, Stop using ICT table */
2375         iwl_disable_ict(priv);
2376
2377         /*
2378          * If a HW restart happens during firmware loading,
2379          * then the firmware loading might call this function
2380          * and later it might be called again due to the
2381          * restart. So don't process again if the device is
2382          * already dead.
2383          */
2384         if (test_bit(STATUS_DEVICE_ENABLED, &priv->status)) {
2385                 iwlagn_txq_ctx_stop(priv);
2386                 iwlagn_rxq_stop(priv);
2387
2388                 /* Power-down device's busmaster DMA clocks */
2389                 iwl_write_prph(priv, APMG_CLK_DIS_REG, APMG_CLK_VAL_DMA_CLK_RQT);
2390                 udelay(5);
2391         }
2392
2393         /* Make sure (redundant) we've released our request to stay awake */
2394         iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
2395
2396         /* Stop the device, and put it in low power state */
2397         iwl_apm_stop(priv);
2398 }