drivers/net/wireless/iwlwifi/iwl-core.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2010 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/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <net/mac80211.h>
  35
  36 #include "iwl-eeprom.h"
  37 #include "iwl-dev.h" /* FIXME: remove */
  38 #include "iwl-debug.h"
  39 #include "iwl-core.h"
  40 #include "iwl-io.h"
  41 #include "iwl-power.h"
  42 #include "iwl-sta.h"
  43 #include "iwl-helpers.h"
  44
  45
  46 /*
  47  * set bt_coex_active to true, uCode will do kill/defer
  48  * every time the priority line is asserted (BT is sending signals on the
  49  * priority line in the PCIx).
  50  * set bt_coex_active to false, uCode will ignore the BT activity and
  51  * perform the normal operation
  52  *
  53  * User might experience transmit issue on some platform due to WiFi/BT
  54  * co-exist problem. The possible behaviors are:
  55  *   Able to scan and finding all the available AP
  56  *   Not able to associate with any AP
  57  * On those platforms, WiFi communication can be restored by set
  58  * "bt_coex_active" module parameter to "false"
  59  *
  60  * default: bt_coex_active = true (BT_COEX_ENABLE)
  61  */
  62 bool bt_coex_active = true;
  63 module_param(bt_coex_active, bool, S_IRUGO);
  64 MODULE_PARM_DESC(bt_coex_active, "enable wifi/bluetooth co-exist");
  65
  66 u32 iwl_debug_level;
  67
  68 const u8 iwl_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  69
  70
  71 /* This function both allocates and initializes hw and priv. */
  72 struct ieee80211_hw *iwl_alloc_all(struct iwl_cfg *cfg)
  73 {
  74         struct iwl_priv *priv;
  75         /* mac80211 allocates memory for this device instance, including
  76          *   space for this driver's private structure */
  77         struct ieee80211_hw *hw;
  78
  79         hw = ieee80211_alloc_hw(sizeof(struct iwl_priv),
  80                                 cfg->ops->ieee80211_ops);
  81         if (hw == NULL) {
  82                 pr_err("%s: Can not allocate network device\n",
  83                        cfg->name);
  84                 goto out;
  85         }
  86
  87         priv = hw->priv;
  88         priv->hw = hw;
  89
  90 out:
  91         return hw;
  92 }
  93
  94 #define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
  95 #define MAX_BIT_RATE_20_MHZ 72 /* Mbps */
  96 static void iwlcore_init_ht_hw_capab(const struct iwl_priv *priv,
  97                               struct ieee80211_sta_ht_cap *ht_info,
  98                               enum ieee80211_band band)
  99 {
 100         u16 max_bit_rate = 0;
 101         u8 rx_chains_num = priv->hw_params.rx_chains_num;
 102         u8 tx_chains_num = priv->hw_params.tx_chains_num;
 103
 104         ht_info->cap = 0;
 105         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
 106
 107         ht_info->ht_supported = true;
 108
 109         if (priv->cfg->ht_params &&
 110             priv->cfg->ht_params->ht_greenfield_support)
 111                 ht_info->cap |= IEEE80211_HT_CAP_GRN_FLD;
 112         ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
 113         max_bit_rate = MAX_BIT_RATE_20_MHZ;
 114         if (priv->hw_params.ht40_channel & BIT(band)) {
 115                 ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
 116                 ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
 117                 ht_info->mcs.rx_mask[4] = 0x01;
 118                 max_bit_rate = MAX_BIT_RATE_40_MHZ;
 119         }
 120
 121         if (priv->cfg->mod_params->amsdu_size_8K)
 122                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
 123
 124         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
 125         if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_factor)
 126                 ht_info->ampdu_factor = priv->cfg->bt_params->ampdu_factor;
 127         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
 128         if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_density)
 129                 ht_info->ampdu_density = priv->cfg->bt_params->ampdu_density;
 130
 131         ht_info->mcs.rx_mask[0] = 0xFF;
 132         if (rx_chains_num >= 2)
 133                 ht_info->mcs.rx_mask[1] = 0xFF;
 134         if (rx_chains_num >= 3)
 135                 ht_info->mcs.rx_mask[2] = 0xFF;
 136
 137         /* Highest supported Rx data rate */
 138         max_bit_rate *= rx_chains_num;
 139         WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
 140         ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
 141
 142         /* Tx MCS capabilities */
 143         ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
 144         if (tx_chains_num != rx_chains_num) {
 145                 ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
 146                 ht_info->mcs.tx_params |= ((tx_chains_num - 1) <<
 147                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
 148         }
 149 }
 150
 151 /**
 152  * iwlcore_init_geos - Initialize mac80211's geo/channel info based from eeprom
 153  */
 154 int iwlcore_init_geos(struct iwl_priv *priv)
 155 {
 156         struct iwl_channel_info *ch;
 157         struct ieee80211_supported_band *sband;
 158         struct ieee80211_channel *channels;
 159         struct ieee80211_channel *geo_ch;
 160         struct ieee80211_rate *rates;
 161         int i = 0;
 162
 163         if (priv->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
 164             priv->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
 165                 IWL_DEBUG_INFO(priv, "Geography modes already initialized.\n");
 166                 set_bit(STATUS_GEO_CONFIGURED, &priv->status);
 167                 return 0;
 168         }
 169
 170         channels = kzalloc(sizeof(struct ieee80211_channel) *
 171                            priv->channel_count, GFP_KERNEL);
 172         if (!channels)
 173                 return -ENOMEM;
 174
 175         rates = kzalloc((sizeof(struct ieee80211_rate) * IWL_RATE_COUNT_LEGACY),
 176                         GFP_KERNEL);
 177         if (!rates) {
 178                 kfree(channels);
 179                 return -ENOMEM;
 180         }
 181
 182         /* 5.2GHz channels start after the 2.4GHz channels */
 183         sband = &priv->bands[IEEE80211_BAND_5GHZ];
 184         sband->channels = &channels[ARRAY_SIZE(iwl_eeprom_band_1)];
 185         /* just OFDM */
 186         sband->bitrates = &rates[IWL_FIRST_OFDM_RATE];
 187         sband->n_bitrates = IWL_RATE_COUNT_LEGACY - IWL_FIRST_OFDM_RATE;
 188
 189         if (priv->cfg->sku & IWL_SKU_N)
 190                 iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
 191                                          IEEE80211_BAND_5GHZ);
 192
 193         sband = &priv->bands[IEEE80211_BAND_2GHZ];
 194         sband->channels = channels;
 195         /* OFDM & CCK */
 196         sband->bitrates = rates;
 197         sband->n_bitrates = IWL_RATE_COUNT_LEGACY;
 198
 199         if (priv->cfg->sku & IWL_SKU_N)
 200                 iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
 201                                          IEEE80211_BAND_2GHZ);
 202
 203         priv->ieee_channels = channels;
 204         priv->ieee_rates = rates;
 205
 206         for (i = 0;  i < priv->channel_count; i++) {
 207                 ch = &priv->channel_info[i];
 208
 209                 /* FIXME: might be removed if scan is OK */
 210                 if (!is_channel_valid(ch))
 211                         continue;
 212
 213                 sband =  &priv->bands[ch->band];
 214
 215                 geo_ch = &sband->channels[sband->n_channels++];
 216
 217                 geo_ch->center_freq =
 218                         ieee80211_channel_to_frequency(ch->channel, ch->band);
 219                 geo_ch->max_power = ch->max_power_avg;
 220                 geo_ch->max_antenna_gain = 0xff;
 221                 geo_ch->hw_value = ch->channel;
 222
 223                 if (is_channel_valid(ch)) {
 224                         if (!(ch->flags & EEPROM_CHANNEL_IBSS))
 225                                 geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;
 226
 227                         if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
 228                                 geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 229
 230                         if (ch->flags & EEPROM_CHANNEL_RADAR)
 231                                 geo_ch->flags |= IEEE80211_CHAN_RADAR;
 232
 233                         geo_ch->flags |= ch->ht40_extension_channel;
 234
 235                         if (ch->max_power_avg > priv->tx_power_device_lmt)
 236                                 priv->tx_power_device_lmt = ch->max_power_avg;
 237                 } else {
 238                         geo_ch->flags |= IEEE80211_CHAN_DISABLED;
 239                 }
 240
 241                 IWL_DEBUG_INFO(priv, "Channel %d Freq=%d[%sGHz] %s flag=0x%X\n",
 242                                 ch->channel, geo_ch->center_freq,
 243                                 is_channel_a_band(ch) ?  "5.2" : "2.4",
 244                                 geo_ch->flags & IEEE80211_CHAN_DISABLED ?
 245                                 "restricted" : "valid",
 246                                  geo_ch->flags);
 247         }
 248
 249         if ((priv->bands[IEEE80211_BAND_5GHZ].n_channels == 0) &&
 250              priv->cfg->sku & IWL_SKU_A) {
 251                 IWL_INFO(priv, "Incorrectly detected BG card as ABG. "
 252                         "Please send your PCI ID 0x%04X:0x%04X to maintainer.\n",
 253                            priv->pci_dev->device,
 254                            priv->pci_dev->subsystem_device);
 255                 priv->cfg->sku &= ~IWL_SKU_A;
 256         }
 257
 258         IWL_INFO(priv, "Tunable channels: %d 802.11bg, %d 802.11a channels\n",
 259                    priv->bands[IEEE80211_BAND_2GHZ].n_channels,
 260                    priv->bands[IEEE80211_BAND_5GHZ].n_channels);
 261
 262         set_bit(STATUS_GEO_CONFIGURED, &priv->status);
 263
 264         return 0;
 265 }
 266
 267 /*
 268  * iwlcore_free_geos - undo allocations in iwlcore_init_geos
 269  */
 270 void iwlcore_free_geos(struct iwl_priv *priv)
 271 {
 272         kfree(priv->ieee_channels);
 273         kfree(priv->ieee_rates);
 274         clear_bit(STATUS_GEO_CONFIGURED, &priv->status);
 275 }
 276
 277 static bool iwl_is_channel_extension(struct iwl_priv *priv,
 278                                      enum ieee80211_band band,
 279                                      u16 channel, u8 extension_chan_offset)
 280 {
 281         const struct iwl_channel_info *ch_info;
 282
 283         ch_info = iwl_get_channel_info(priv, band, channel);
 284         if (!is_channel_valid(ch_info))
 285                 return false;
 286
 287         if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
 288                 return !(ch_info->ht40_extension_channel &
 289                                         IEEE80211_CHAN_NO_HT40PLUS);
 290         else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
 291                 return !(ch_info->ht40_extension_channel &
 292                                         IEEE80211_CHAN_NO_HT40MINUS);
 293
 294         return false;
 295 }
 296
 297 bool iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
 298                             struct iwl_rxon_context *ctx,
 299                             struct ieee80211_sta_ht_cap *ht_cap)
 300 {
 301         if (!ctx->ht.enabled || !ctx->ht.is_40mhz)
 302                 return false;
 303
 304         /*
 305          * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
 306          * the bit will not set if it is pure 40MHz case
 307          */
 308         if (ht_cap && !ht_cap->ht_supported)
 309                 return false;
 310
 311 #ifdef CONFIG_IWLWIFI_DEBUGFS
 312         if (priv->disable_ht40)
 313                 return false;
 314 #endif
 315
 316         return iwl_is_channel_extension(priv, priv->band,
 317                         le16_to_cpu(ctx->staging.channel),
 318                         ctx->ht.extension_chan_offset);
 319 }
 320
 321 static u16 iwl_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
 322 {
 323         u16 new_val;
 324         u16 beacon_factor;
 325
 326         /*
 327          * If mac80211 hasn't given us a beacon interval, program
 328          * the default into the device (not checking this here
 329          * would cause the adjustment below to return the maximum
 330          * value, which may break PAN.)
 331          */
 332         if (!beacon_val)
 333                 return DEFAULT_BEACON_INTERVAL;
 334
 335         /*
 336          * If the beacon interval we obtained from the peer
 337          * is too large, we'll have to wake up more often
 338          * (and in IBSS case, we'll beacon too much)
 339          *
 340          * For example, if max_beacon_val is 4096, and the
 341          * requested beacon interval is 7000, we'll have to
 342          * use 3500 to be able to wake up on the beacons.
 343          *
 344          * This could badly influence beacon detection stats.
 345          */
 346
 347         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
 348         new_val = beacon_val / beacon_factor;
 349
 350         if (!new_val)
 351                 new_val = max_beacon_val;
 352
 353         return new_val;
 354 }
 355
 356 int iwl_send_rxon_timing(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 357 {
 358         u64 tsf;
 359         s32 interval_tm, rem;
 360         struct ieee80211_conf *conf = NULL;
 361         u16 beacon_int;
 362         struct ieee80211_vif *vif = ctx->vif;
 363
 364         conf = ieee80211_get_hw_conf(priv->hw);
 365
 366         lockdep_assert_held(&priv->mutex);
 367
 368         memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));
 369
 370         ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
 371         ctx->timing.listen_interval = cpu_to_le16(conf->listen_interval);
 372
 373         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
 374
 375         /*
 376          * TODO: For IBSS we need to get atim_window from mac80211,
 377          *       for now just always use 0
 378          */
 379         ctx->timing.atim_window = 0;
 380
 381         if (ctx->ctxid == IWL_RXON_CTX_PAN &&
 382             (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
 383             iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
 384             priv->contexts[IWL_RXON_CTX_BSS].vif &&
 385             priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
 386                 ctx->timing.beacon_interval =
 387                         priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
 388                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 389         } else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
 390                    iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
 391                    priv->contexts[IWL_RXON_CTX_PAN].vif &&
 392                    priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
 393                    (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
 394                     !ctx->vif->bss_conf.beacon_int)) {
 395                 ctx->timing.beacon_interval =
 396                         priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
 397                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 398         } else {
 399                 beacon_int = iwl_adjust_beacon_interval(beacon_int,
 400                                 priv->hw_params.max_beacon_itrvl * TIME_UNIT);
 401                 ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
 402         }
 403
 404         tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
 405         interval_tm = beacon_int * TIME_UNIT;
 406         rem = do_div(tsf, interval_tm);
 407         ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
 408
 409         ctx->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ?: 1) : 1;
 410
 411         IWL_DEBUG_ASSOC(priv,
 412                         "beacon interval %d beacon timer %d beacon tim %d\n",
 413                         le16_to_cpu(ctx->timing.beacon_interval),
 414                         le32_to_cpu(ctx->timing.beacon_init_val),
 415                         le16_to_cpu(ctx->timing.atim_window));
 416
 417         return iwl_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
 418                                 sizeof(ctx->timing), &ctx->timing);
 419 }
 420
 421 void iwl_set_rxon_hwcrypto(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 422                            int hw_decrypt)
 423 {
 424         struct iwl_rxon_cmd *rxon = &ctx->staging;
 425
 426         if (hw_decrypt)
 427                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
 428         else
 429                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
 430
 431 }
 432
 433 /* validate RXON structure is valid */
 434 int iwl_check_rxon_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 435 {
 436         struct iwl_rxon_cmd *rxon = &ctx->staging;
 437         bool error = false;
 438
 439         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
 440                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
 441                         IWL_WARN(priv, "check 2.4G: wrong narrow\n");
 442                         error = true;
 443                 }
 444                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
 445                         IWL_WARN(priv, "check 2.4G: wrong radar\n");
 446                         error = true;
 447                 }
 448         } else {
 449                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
 450                         IWL_WARN(priv, "check 5.2G: not short slot!\n");
 451                         error = true;
 452                 }
 453                 if (rxon->flags & RXON_FLG_CCK_MSK) {
 454                         IWL_WARN(priv, "check 5.2G: CCK!\n");
 455                         error = true;
 456                 }
 457         }
 458         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
 459                 IWL_WARN(priv, "mac/bssid mcast!\n");
 460                 error = true;
 461         }
 462
 463         /* make sure basic rates 6Mbps and 1Mbps are supported */
 464         if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
 465             (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
 466                 IWL_WARN(priv, "neither 1 nor 6 are basic\n");
 467                 error = true;
 468         }
 469
 470         if (le16_to_cpu(rxon->assoc_id) > 2007) {
 471                 IWL_WARN(priv, "aid > 2007\n");
 472                 error = true;
 473         }
 474
 475         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
 476                         == (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
 477                 IWL_WARN(priv, "CCK and short slot\n");
 478                 error = true;
 479         }
 480
 481         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
 482                         == (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
 483                 IWL_WARN(priv, "CCK and auto detect");
 484                 error = true;
 485         }
 486
 487         if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
 488                             RXON_FLG_TGG_PROTECT_MSK)) ==
 489                             RXON_FLG_TGG_PROTECT_MSK) {
 490                 IWL_WARN(priv, "TGg but no auto-detect\n");
 491                 error = true;
 492         }
 493
 494         if (error)
 495                 IWL_WARN(priv, "Tuning to channel %d\n",
 496                             le16_to_cpu(rxon->channel));
 497
 498         if (error) {
 499                 IWL_ERR(priv, "Invalid RXON\n");
 500                 return -EINVAL;
 501         }
 502         return 0;
 503 }
 504
 505 /**
 506  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 507  * @priv: staging_rxon is compared to active_rxon
 508  *
 509  * If the RXON structure is changing enough to require a new tune,
 510  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
 511  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
 512  */
 513 int iwl_full_rxon_required(struct iwl_priv *priv,
 514                            struct iwl_rxon_context *ctx)
 515 {
 516         const struct iwl_rxon_cmd *staging = &ctx->staging;
 517         const struct iwl_rxon_cmd *active = &ctx->active;
 518
 519 #define CHK(cond)                                                       \
 520         if ((cond)) {                                                   \
 521                 IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");   \
 522                 return 1;                                               \
 523         }
 524
 525 #define CHK_NEQ(c1, c2)                                         \
 526         if ((c1) != (c2)) {                                     \
 527                 IWL_DEBUG_INFO(priv, "need full RXON - "        \
 528                                #c1 " != " #c2 " - %d != %d\n",  \
 529                                (c1), (c2));                     \
 530                 return 1;                                       \
 531         }
 532
 533         /* These items are only settable from the full RXON command */
 534         CHK(!iwl_is_associated_ctx(ctx));
 535         CHK(compare_ether_addr(staging->bssid_addr, active->bssid_addr));
 536         CHK(compare_ether_addr(staging->node_addr, active->node_addr));
 537         CHK(compare_ether_addr(staging->wlap_bssid_addr,
 538                                 active->wlap_bssid_addr));
 539         CHK_NEQ(staging->dev_type, active->dev_type);
 540         CHK_NEQ(staging->channel, active->channel);
 541         CHK_NEQ(staging->air_propagation, active->air_propagation);
 542         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
 543                 active->ofdm_ht_single_stream_basic_rates);
 544         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
 545                 active->ofdm_ht_dual_stream_basic_rates);
 546         CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
 547                 active->ofdm_ht_triple_stream_basic_rates);
 548         CHK_NEQ(staging->assoc_id, active->assoc_id);
 549
 550         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
 551          * be updated with the RXON_ASSOC command -- however only some
 552          * flag transitions are allowed using RXON_ASSOC */
 553
 554         /* Check if we are not switching bands */
 555         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
 556                 active->flags & RXON_FLG_BAND_24G_MSK);
 557
 558         /* Check if we are switching association toggle */
 559         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
 560                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
 561
 562 #undef CHK
 563 #undef CHK_NEQ
 564
 565         return 0;
 566 }
 567
 568 u8 iwl_rate_get_lowest_plcp(struct iwl_priv *priv,
 569                             struct iwl_rxon_context *ctx)
 570 {
 571         /*
 572          * Assign the lowest rate -- should really get this from
 573          * the beacon skb from mac80211.
 574          */
 575         if (ctx->staging.flags & RXON_FLG_BAND_24G_MSK)
 576                 return IWL_RATE_1M_PLCP;
 577         else
 578                 return IWL_RATE_6M_PLCP;
 579 }
 580
 581 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
 582                              struct iwl_ht_config *ht_conf,
 583                              struct iwl_rxon_context *ctx)
 584 {
 585         struct iwl_rxon_cmd *rxon = &ctx->staging;
 586
 587         if (!ctx->ht.enabled) {
 588                 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 589                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
 590                         RXON_FLG_HT40_PROT_MSK |
 591                         RXON_FLG_HT_PROT_MSK);
 592                 return;
 593         }
 594
 595         /* FIXME: if the definition of ht.protection changed, the "translation"
 596          * will be needed for rxon->flags
 597          */
 598         rxon->flags |= cpu_to_le32(ctx->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
 599
 600         /* Set up channel bandwidth:
 601          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
 602         /* clear the HT channel mode before set the mode */
 603         rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 604                          RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 605         if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
 606                 /* pure ht40 */
 607                 if (ctx->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
 608                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
 609                         /* Note: control channel is opposite of extension channel */
 610                         switch (ctx->ht.extension_chan_offset) {
 611                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 612                                 rxon->flags &= ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 613                                 break;
 614                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 615                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 616                                 break;
 617                         }
 618                 } else {
 619                         /* Note: control channel is opposite of extension channel */
 620                         switch (ctx->ht.extension_chan_offset) {
 621                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 622                                 rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 623                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 624                                 break;
 625                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 626                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 627                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 628                                 break;
 629                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
 630                         default:
 631                                 /* channel location only valid if in Mixed mode */
 632                                 IWL_ERR(priv, "invalid extension channel offset\n");
 633                                 break;
 634                         }
 635                 }
 636         } else {
 637                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
 638         }
 639
 640         if (priv->cfg->ops->hcmd->set_rxon_chain)
 641                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
 642
 643         IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
 644                         "extension channel offset 0x%x\n",
 645                         le32_to_cpu(rxon->flags), ctx->ht.protection,
 646                         ctx->ht.extension_chan_offset);
 647 }
 648
 649 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
 650 {
 651         struct iwl_rxon_context *ctx;
 652
 653         for_each_context(priv, ctx)
 654                 _iwl_set_rxon_ht(priv, ht_conf, ctx);
 655 }
 656
 657 /* Return valid, unused, channel for a passive scan to reset the RF */
 658 u8 iwl_get_single_channel_number(struct iwl_priv *priv,
 659                                  enum ieee80211_band band)
 660 {
 661         const struct iwl_channel_info *ch_info;
 662         int i;
 663         u8 channel = 0;
 664         u8 min, max;
 665         struct iwl_rxon_context *ctx;
 666
 667         if (band == IEEE80211_BAND_5GHZ) {
 668                 min = 14;
 669                 max = priv->channel_count;
 670         } else {
 671                 min = 0;
 672                 max = 14;
 673         }
 674
 675         for (i = min; i < max; i++) {
 676                 bool busy = false;
 677
 678                 for_each_context(priv, ctx) {
 679                         busy = priv->channel_info[i].channel ==
 680                                 le16_to_cpu(ctx->staging.channel);
 681                         if (busy)
 682                                 break;
 683                 }
 684
 685                 if (busy)
 686                         continue;
 687
 688                 channel = priv->channel_info[i].channel;
 689                 ch_info = iwl_get_channel_info(priv, band, channel);
 690                 if (is_channel_valid(ch_info))
 691                         break;
 692         }
 693
 694         return channel;
 695 }
 696
 697 /**
 698  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
 699  * @ch: requested channel as a pointer to struct ieee80211_channel
 700
 701  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 702  * in the staging RXON flag structure based on the ch->band
 703  */
 704 int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
 705                          struct iwl_rxon_context *ctx)
 706 {
 707         enum ieee80211_band band = ch->band;
 708         u16 channel = ch->hw_value;
 709
 710         if ((le16_to_cpu(ctx->staging.channel) == channel) &&
 711             (priv->band == band))
 712                 return 0;
 713
 714         ctx->staging.channel = cpu_to_le16(channel);
 715         if (band == IEEE80211_BAND_5GHZ)
 716                 ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
 717         else
 718                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 719
 720         priv->band = band;
 721
 722         IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
 723
 724         return 0;
 725 }
 726
 727 void iwl_set_flags_for_band(struct iwl_priv *priv,
 728                             struct iwl_rxon_context *ctx,
 729                             enum ieee80211_band band,
 730                             struct ieee80211_vif *vif)
 731 {
 732         if (band == IEEE80211_BAND_5GHZ) {
 733                 ctx->staging.flags &=
 734                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
 735                       | RXON_FLG_CCK_MSK);
 736                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 737         } else {
 738                 /* Copied from iwl_post_associate() */
 739                 if (vif && vif->bss_conf.use_short_slot)
 740                         ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 741                 else
 742                         ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 743
 744                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 745                 ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
 746                 ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
 747         }
 748 }
 749
 750 /*
 751  * initialize rxon structure with default values from eeprom
 752  */
 753 void iwl_connection_init_rx_config(struct iwl_priv *priv,
 754                                    struct iwl_rxon_context *ctx)
 755 {
 756         const struct iwl_channel_info *ch_info;
 757
 758         memset(&ctx->staging, 0, sizeof(ctx->staging));
 759
 760         if (!ctx->vif) {
 761                 ctx->staging.dev_type = ctx->unused_devtype;
 762         } else switch (ctx->vif->type) {
 763         case NL80211_IFTYPE_AP:
 764                 ctx->staging.dev_type = ctx->ap_devtype;
 765                 break;
 766
 767         case NL80211_IFTYPE_STATION:
 768                 ctx->staging.dev_type = ctx->station_devtype;
 769                 ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
 770                 break;
 771
 772         case NL80211_IFTYPE_ADHOC:
 773                 ctx->staging.dev_type = ctx->ibss_devtype;
 774                 ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
 775                 ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
 776                                                   RXON_FILTER_ACCEPT_GRP_MSK;
 777                 break;
 778
 779         default:
 780                 IWL_ERR(priv, "Unsupported interface type %d\n",
 781                         ctx->vif->type);
 782                 break;
 783         }
 784
 785 #if 0
 786         /* TODO:  Figure out when short_preamble would be set and cache from
 787          * that */
 788         if (!hw_to_local(priv->hw)->short_preamble)
 789                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 790         else
 791                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 792 #endif
 793
 794         ch_info = iwl_get_channel_info(priv, priv->band,
 795                                        le16_to_cpu(ctx->active.channel));
 796
 797         if (!ch_info)
 798                 ch_info = &priv->channel_info[0];
 799
 800         ctx->staging.channel = cpu_to_le16(ch_info->channel);
 801         priv->band = ch_info->band;
 802
 803         iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
 804
 805         ctx->staging.ofdm_basic_rates =
 806             (IWL_OFDM_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 807         ctx->staging.cck_basic_rates =
 808             (IWL_CCK_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 809
 810         /* clear both MIX and PURE40 mode flag */
 811         ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
 812                                         RXON_FLG_CHANNEL_MODE_PURE_40);
 813         if (ctx->vif)
 814                 memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
 815
 816         ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
 817         ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
 818         ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
 819 }
 820
 821 void iwl_set_rate(struct iwl_priv *priv)
 822 {
 823         const struct ieee80211_supported_band *hw = NULL;
 824         struct ieee80211_rate *rate;
 825         struct iwl_rxon_context *ctx;
 826         int i;
 827
 828         hw = iwl_get_hw_mode(priv, priv->band);
 829         if (!hw) {
 830                 IWL_ERR(priv, "Failed to set rate: unable to get hw mode\n");
 831                 return;
 832         }
 833
 834         priv->active_rate = 0;
 835
 836         for (i = 0; i < hw->n_bitrates; i++) {
 837                 rate = &(hw->bitrates[i]);
 838                 if (rate->hw_value < IWL_RATE_COUNT_LEGACY)
 839                         priv->active_rate |= (1 << rate->hw_value);
 840         }
 841
 842         IWL_DEBUG_RATE(priv, "Set active_rate = %0x\n", priv->active_rate);
 843
 844         for_each_context(priv, ctx) {
 845                 ctx->staging.cck_basic_rates =
 846                     (IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 847
 848                 ctx->staging.ofdm_basic_rates =
 849                    (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 850         }
 851 }
 852
 853 void iwl_chswitch_done(struct iwl_priv *priv, bool is_success)
 854 {
 855         /*
 856          * MULTI-FIXME
 857          * See iwl_mac_channel_switch.
 858          */
 859         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 860
 861         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 862                 return;
 863
 864         if (priv->switch_rxon.switch_in_progress) {
 865                 ieee80211_chswitch_done(ctx->vif, is_success);
 866                 mutex_lock(&priv->mutex);
 867                 priv->switch_rxon.switch_in_progress = false;
 868                 mutex_unlock(&priv->mutex);
 869         }
 870 }
 871
 872 #ifdef CONFIG_IWLWIFI_DEBUG
 873 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
 874                              struct iwl_rxon_context *ctx)
 875 {
 876         struct iwl_rxon_cmd *rxon = &ctx->staging;
 877
 878         IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
 879         iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
 880         IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
 881         IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
 882         IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
 883                         le32_to_cpu(rxon->filter_flags));
 884         IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
 885         IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
 886                         rxon->ofdm_basic_rates);
 887         IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
 888         IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
 889         IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
 890         IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
 891 }
 892 #endif
 893
 894 void iwlagn_fw_error(struct iwl_priv *priv, bool ondemand)
 895 {
 896         unsigned int reload_msec;
 897         unsigned long reload_jiffies;
 898
 899         /* Set the FW error flag -- cleared on iwl_down */
 900         set_bit(STATUS_FW_ERROR, &priv->status);
 901
 902         /* Cancel currently queued command. */
 903         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 904
 905         /* Keep the restart process from trying to send host
 906          * commands by clearing the ready bit */
 907         clear_bit(STATUS_READY, &priv->status);
 908
 909         wake_up_interruptible(&priv->wait_command_queue);
 910
 911         if (!ondemand) {
 912                 /*
 913                  * If firmware keep reloading, then it indicate something
 914                  * serious wrong and firmware having problem to recover
 915                  * from it. Instead of keep trying which will fill the syslog
 916                  * and hang the system, let's just stop it
 917                  */
 918                 reload_jiffies = jiffies;
 919                 reload_msec = jiffies_to_msecs((long) reload_jiffies -
 920                                         (long) priv->reload_jiffies);
 921                 priv->reload_jiffies = reload_jiffies;
 922                 if (reload_msec <= IWL_MIN_RELOAD_DURATION) {
 923                         priv->reload_count++;
 924                         if (priv->reload_count >= IWL_MAX_CONTINUE_RELOAD_CNT) {
 925                                 IWL_ERR(priv, "BUG_ON, Stop restarting\n");
 926                                 return;
 927                         }
 928                 } else
 929                         priv->reload_count = 0;
 930         }
 931
 932         if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 933                 if (priv->cfg->mod_params->restart_fw) {
 934                         IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
 935                                   "Restarting adapter due to uCode error.\n");
 936                         queue_work(priv->workqueue, &priv->restart);
 937                 } else
 938                         IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
 939                                   "Detected FW error, but not restarting\n");
 940         }
 941 }
 942
 943 /**
 944  * iwl_irq_handle_error - called for HW or SW error interrupt from card
 945  */
 946 void iwl_irq_handle_error(struct iwl_priv *priv)
 947 {
 948         /* W/A for WiFi/WiMAX coex and WiMAX own the RF */
 949         if (priv->cfg->internal_wimax_coex &&
 950             (!(iwl_read_prph(priv, APMG_CLK_CTRL_REG) &
 951                         APMS_CLK_VAL_MRB_FUNC_MODE) ||
 952              (iwl_read_prph(priv, APMG_PS_CTRL_REG) &
 953                         APMG_PS_CTRL_VAL_RESET_REQ))) {
 954                 /*
 955                  * Keep the restart process from trying to send host
 956                  * commands by clearing the ready bit.
 957                  */
 958                 clear_bit(STATUS_READY, &priv->status);
 959                 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 960                 wake_up_interruptible(&priv->wait_command_queue);
 961                 IWL_ERR(priv, "RF is used by WiMAX\n");
 962                 return;
 963         }
 964
 965         IWL_ERR(priv, "Loaded firmware version: %s\n",
 966                 priv->hw->wiphy->fw_version);
 967
 968         priv->cfg->ops->lib->dump_nic_error_log(priv);
 969         if (priv->cfg->ops->lib->dump_csr)
 970                 priv->cfg->ops->lib->dump_csr(priv);
 971         if (priv->cfg->ops->lib->dump_fh)
 972                 priv->cfg->ops->lib->dump_fh(priv, NULL, false);
 973         priv->cfg->ops->lib->dump_nic_event_log(priv, false, NULL, false);
 974 #ifdef CONFIG_IWLWIFI_DEBUG
 975         if (iwl_get_debug_level(priv) & IWL_DL_FW_ERRORS)
 976                 iwl_print_rx_config_cmd(priv,
 977                                         &priv->contexts[IWL_RXON_CTX_BSS]);
 978 #endif
 979
 980         iwlagn_fw_error(priv, false);
 981 }
 982
 983 static int iwl_apm_stop_master(struct iwl_priv *priv)
 984 {
 985         int ret = 0;
 986
 987         /* stop device's busmaster DMA activity */
 988         iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
 989
 990         ret = iwl_poll_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
 991                         CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
 992         if (ret)
 993                 IWL_WARN(priv, "Master Disable Timed Out, 100 usec\n");
 994
 995         IWL_DEBUG_INFO(priv, "stop master\n");
 996
 997         return ret;
 998 }
 999
1000 void iwl_apm_stop(struct iwl_priv *priv)
1001 {
1002         IWL_DEBUG_INFO(priv, "Stop card, put in low power state\n");
1003
1004         /* Stop device's DMA activity */
1005         iwl_apm_stop_master(priv);
1006
1007         /* Reset the entire device */
1008         iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
1009
1010         udelay(10);
1011
1012         /*
1013          * Clear "initialization complete" bit to move adapter from
1014          * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
1015          */
1016         iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
1017 }
1018
1019
1020 /*
1021  * Start up NIC's basic functionality after it has been reset
1022  * (e.g. after platform boot, or shutdown via iwl_apm_stop())
1023  * NOTE:  This does not load uCode nor start the embedded processor
1024  */
1025 int iwl_apm_init(struct iwl_priv *priv)
1026 {
1027         int ret = 0;
1028         u16 lctl;
1029
1030         IWL_DEBUG_INFO(priv, "Init card's basic functions\n");
1031
1032         /*
1033          * Use "set_bit" below rather than "write", to preserve any hardware
1034          * bits already set by default after reset.
1035          */
1036
1037         /* Disable L0S exit timer (platform NMI Work/Around) */
1038         iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
1039                           CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
1040
1041         /*
1042          * Disable L0s without affecting L1;
1043          *  don't wait for ICH L0s (ICH bug W/A)
1044          */
1045         iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
1046                           CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
1047
1048         /* Set FH wait threshold to maximum (HW error during stress W/A) */
1049         iwl_set_bit(priv, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
1050
1051         /*
1052          * Enable HAP INTA (interrupt from management bus) to
1053          * wake device's PCI Express link L1a -> L0s
1054          * NOTE:  This is no-op for 3945 (non-existant bit)
1055          */
1056         iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
1057                                     CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
1058
1059         /*
1060          * HW bug W/A for instability in PCIe bus L0->L0S->L1 transition.
1061          * Check if BIOS (or OS) enabled L1-ASPM on this device.
1062          * If so (likely), disable L0S, so device moves directly L0->L1;
1063          *    costs negligible amount of power savings.
1064          * If not (unlikely), enable L0S, so there is at least some
1065          *    power savings, even without L1.
1066          */
1067         if (priv->cfg->base_params->set_l0s) {
1068                 lctl = iwl_pcie_link_ctl(priv);
1069                 if ((lctl & PCI_CFG_LINK_CTRL_VAL_L1_EN) ==
1070                                         PCI_CFG_LINK_CTRL_VAL_L1_EN) {
1071                         /* L1-ASPM enabled; disable(!) L0S  */
1072                         iwl_set_bit(priv, CSR_GIO_REG,
1073                                         CSR_GIO_REG_VAL_L0S_ENABLED);
1074                         IWL_DEBUG_POWER(priv, "L1 Enabled; Disabling L0S\n");
1075                 } else {
1076                         /* L1-ASPM disabled; enable(!) L0S */
1077                         iwl_clear_bit(priv, CSR_GIO_REG,
1078                                         CSR_GIO_REG_VAL_L0S_ENABLED);
1079                         IWL_DEBUG_POWER(priv, "L1 Disabled; Enabling L0S\n");
1080                 }
1081         }
1082
1083         /* Configure analog phase-lock-loop before activating to D0A */
1084         if (priv->cfg->base_params->pll_cfg_val)
1085                 iwl_set_bit(priv, CSR_ANA_PLL_CFG,
1086                             priv->cfg->base_params->pll_cfg_val);
1087
1088         /*
1089          * Set "initialization complete" bit to move adapter from
1090          * D0U* --> D0A* (powered-up active) state.
1091          */
1092         iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
1093
1094         /*
1095          * Wait for clock stabilization; once stabilized, access to
1096          * device-internal resources is supported, e.g. iwl_write_prph()
1097          * and accesses to uCode SRAM.
1098          */
1099         ret = iwl_poll_bit(priv, CSR_GP_CNTRL,
1100                         CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
1101                         CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
1102         if (ret < 0) {
1103                 IWL_DEBUG_INFO(priv, "Failed to init the card\n");
1104                 goto out;
1105         }
1106
1107         /*
1108          * Enable DMA and BSM (if used) clocks, wait for them to stabilize.
1109          * BSM (Boostrap State Machine) is only in 3945 and 4965;
1110          * later devices (i.e. 5000 and later) have non-volatile SRAM,
1111          * and don't need BSM to restore data after power-saving sleep.
1112          *
1113          * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
1114          * do not disable clocks.  This preserves any hardware bits already
1115          * set by default in "CLK_CTRL_REG" after reset.
1116          */
1117         if (priv->cfg->base_params->use_bsm)
1118                 iwl_write_prph(priv, APMG_CLK_EN_REG,
1119                         APMG_CLK_VAL_DMA_CLK_RQT | APMG_CLK_VAL_BSM_CLK_RQT);
1120         else
1121                 iwl_write_prph(priv, APMG_CLK_EN_REG,
1122                         APMG_CLK_VAL_DMA_CLK_RQT);
1123         udelay(20);
1124
1125         /* Disable L1-Active */
1126         iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
1127                           APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
1128
1129 out:
1130         return ret;
1131 }
1132
1133
1134 int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
1135 {
1136         int ret;
1137         s8 prev_tx_power;
1138         bool defer;
1139         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
1140
1141         lockdep_assert_held(&priv->mutex);
1142
1143         if (priv->tx_power_user_lmt == tx_power && !force)
1144                 return 0;
1145
1146         if (!priv->cfg->ops->lib->send_tx_power)
1147                 return -EOPNOTSUPP;
1148
1149         if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
1150                 IWL_WARN(priv,
1151                          "Requested user TXPOWER %d below lower limit %d.\n",
1152                          tx_power,
1153                          IWLAGN_TX_POWER_TARGET_POWER_MIN);
1154                 return -EINVAL;
1155         }
1156
1157         if (tx_power > priv->tx_power_device_lmt) {
1158                 IWL_WARN(priv,
1159                         "Requested user TXPOWER %d above upper limit %d.\n",
1160                          tx_power, priv->tx_power_device_lmt);
1161                 return -EINVAL;
1162         }
1163
1164         if (!iwl_is_ready_rf(priv))
1165                 return -EIO;
1166
1167         /* scan complete and commit_rxon use tx_power_next value,
1168          * it always need to be updated for newest request */
1169         priv->tx_power_next = tx_power;
1170
1171         /* do not set tx power when scanning or channel changing */
1172         defer = test_bit(STATUS_SCANNING, &priv->status) ||
1173                 memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
1174         if (defer && !force) {
1175                 IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
1176                 return 0;
1177         }
1178
1179         prev_tx_power = priv->tx_power_user_lmt;
1180         priv->tx_power_user_lmt = tx_power;
1181
1182         ret = priv->cfg->ops->lib->send_tx_power(priv);
1183
1184         /* if fail to set tx_power, restore the orig. tx power */
1185         if (ret) {
1186                 priv->tx_power_user_lmt = prev_tx_power;
1187                 priv->tx_power_next = prev_tx_power;
1188         }
1189         return ret;
1190 }
1191
1192 void iwl_send_bt_config(struct iwl_priv *priv)
1193 {
1194         struct iwl_bt_cmd bt_cmd = {
1195                 .lead_time = BT_LEAD_TIME_DEF,
1196                 .max_kill = BT_MAX_KILL_DEF,
1197                 .kill_ack_mask = 0,
1198                 .kill_cts_mask = 0,
1199         };
1200
1201         if (!bt_coex_active)
1202                 bt_cmd.flags = BT_COEX_DISABLE;
1203         else
1204                 bt_cmd.flags = BT_COEX_ENABLE;
1205
1206         priv->bt_enable_flag = bt_cmd.flags;
1207         IWL_DEBUG_INFO(priv, "BT coex %s\n",
1208                 (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
1209
1210         if (iwl_send_cmd_pdu(priv, REPLY_BT_CONFIG,
1211                              sizeof(struct iwl_bt_cmd), &bt_cmd))
1212                 IWL_ERR(priv, "failed to send BT Coex Config\n");
1213 }
1214
1215 int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags, bool clear)
1216 {
1217         struct iwl_statistics_cmd statistics_cmd = {
1218                 .configuration_flags =
1219                         clear ? IWL_STATS_CONF_CLEAR_STATS : 0,
1220         };
1221
1222         if (flags & CMD_ASYNC)
1223                 return iwl_send_cmd_pdu_async(priv, REPLY_STATISTICS_CMD,
1224                                                sizeof(struct iwl_statistics_cmd),
1225                                                &statistics_cmd, NULL);
1226         else
1227                 return iwl_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
1228                                         sizeof(struct iwl_statistics_cmd),
1229                                         &statistics_cmd);
1230 }
1231
1232 void iwl_clear_isr_stats(struct iwl_priv *priv)
1233 {
1234         memset(&priv->isr_stats, 0, sizeof(priv->isr_stats));
1235 }
1236
1237 int iwl_mac_conf_tx(struct ieee80211_hw *hw, u16 queue,
1238                            const struct ieee80211_tx_queue_params *params)
1239 {
1240         struct iwl_priv *priv = hw->priv;
1241         struct iwl_rxon_context *ctx;
1242         unsigned long flags;
1243         int q;
1244
1245         IWL_DEBUG_MAC80211(priv, "enter\n");
1246
1247         if (!iwl_is_ready_rf(priv)) {
1248                 IWL_DEBUG_MAC80211(priv, "leave - RF not ready\n");
1249                 return -EIO;
1250         }
1251
1252         if (queue >= AC_NUM) {
1253                 IWL_DEBUG_MAC80211(priv, "leave - queue >= AC_NUM %d\n", queue);
1254                 return 0;
1255         }
1256
1257         q = AC_NUM - 1 - queue;
1258
1259         spin_lock_irqsave(&priv->lock, flags);
1260
1261         /*
1262          * MULTI-FIXME
1263          * This may need to be done per interface in nl80211/cfg80211/mac80211.
1264          */
1265         for_each_context(priv, ctx) {
1266                 ctx->qos_data.def_qos_parm.ac[q].cw_min =
1267                         cpu_to_le16(params->cw_min);
1268                 ctx->qos_data.def_qos_parm.ac[q].cw_max =
1269                         cpu_to_le16(params->cw_max);
1270                 ctx->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
1271                 ctx->qos_data.def_qos_parm.ac[q].edca_txop =
1272                                 cpu_to_le16((params->txop * 32));
1273
1274                 ctx->qos_data.def_qos_parm.ac[q].reserved1 = 0;
1275         }
1276
1277         spin_unlock_irqrestore(&priv->lock, flags);
1278
1279         IWL_DEBUG_MAC80211(priv, "leave\n");
1280         return 0;
1281 }
1282
1283 int iwl_mac_tx_last_beacon(struct ieee80211_hw *hw)
1284 {
1285         struct iwl_priv *priv = hw->priv;
1286
1287         return priv->ibss_manager == IWL_IBSS_MANAGER;
1288 }
1289
1290 static int iwl_set_mode(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
1291 {
1292         iwl_connection_init_rx_config(priv, ctx);
1293
1294         if (priv->cfg->ops->hcmd->set_rxon_chain)
1295                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
1296
1297         return iwlcore_commit_rxon(priv, ctx);
1298 }
1299
1300 static int iwl_setup_interface(struct iwl_priv *priv,
1301                                struct iwl_rxon_context *ctx)
1302 {
1303         struct ieee80211_vif *vif = ctx->vif;
1304         int err;
1305
1306         lockdep_assert_held(&priv->mutex);
1307
1308         /*
1309          * This variable will be correct only when there's just
1310          * a single context, but all code using it is for hardware
1311          * that supports only one context.
1312          */
1313         priv->iw_mode = vif->type;
1314
1315         ctx->is_active = true;
1316
1317         err = iwl_set_mode(priv, ctx);
1318         if (err) {
1319                 if (!ctx->always_active)
1320                         ctx->is_active = false;
1321                 return err;
1322         }
1323
1324         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist &&
1325             vif->type == NL80211_IFTYPE_ADHOC) {
1326                 /*
1327                  * pretend to have high BT traffic as long as we
1328                  * are operating in IBSS mode, as this will cause
1329                  * the rate scaling etc. to behave as intended.
1330                  */
1331                 priv->bt_traffic_load = IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
1332         }
1333
1334         return 0;
1335 }
1336
1337 int iwl_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
1338 {
1339         struct iwl_priv *priv = hw->priv;
1340         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1341         struct iwl_rxon_context *tmp, *ctx = NULL;
1342         int err;
1343         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(vif);
1344
1345         IWL_DEBUG_MAC80211(priv, "enter: type %d, addr %pM\n",
1346                            viftype, vif->addr);
1347
1348         mutex_lock(&priv->mutex);
1349
1350         if (!iwl_is_ready_rf(priv)) {
1351                 IWL_WARN(priv, "Try to add interface when device not ready\n");
1352                 err = -EINVAL;
1353                 goto out;
1354         }
1355
1356         for_each_context(priv, tmp) {
1357                 u32 possible_modes =
1358                         tmp->interface_modes | tmp->exclusive_interface_modes;
1359
1360                 if (tmp->vif) {
1361                         /* check if this busy context is exclusive */
1362                         if (tmp->exclusive_interface_modes &
1363                                                 BIT(tmp->vif->type)) {
1364                                 err = -EINVAL;
1365                                 goto out;
1366                         }
1367                         continue;
1368                 }
1369
1370                 if (!(possible_modes & BIT(viftype)))
1371                         continue;
1372
1373                 /* have maybe usable context w/o interface */
1374                 ctx = tmp;
1375                 break;
1376         }
1377
1378         if (!ctx) {
1379                 err = -EOPNOTSUPP;
1380                 goto out;
1381         }
1382
1383         vif_priv->ctx = ctx;
1384         ctx->vif = vif;
1385
1386         err = iwl_setup_interface(priv, ctx);
1387         if (!err)
1388                 goto out;
1389
1390         ctx->vif = NULL;
1391         priv->iw_mode = NL80211_IFTYPE_STATION;
1392  out:
1393         mutex_unlock(&priv->mutex);
1394
1395         IWL_DEBUG_MAC80211(priv, "leave\n");
1396         return err;
1397 }
1398
1399 static void iwl_teardown_interface(struct iwl_priv *priv,
1400                                    struct ieee80211_vif *vif,
1401                                    bool mode_change)
1402 {
1403         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1404
1405         lockdep_assert_held(&priv->mutex);
1406
1407         if (priv->scan_vif == vif) {
1408                 iwl_scan_cancel_timeout(priv, 200);
1409                 iwl_force_scan_end(priv);
1410         }
1411
1412         if (!mode_change) {
1413                 iwl_set_mode(priv, ctx);
1414                 if (!ctx->always_active)
1415                         ctx->is_active = false;
1416         }
1417
1418         /*
1419          * When removing the IBSS interface, overwrite the
1420          * BT traffic load with the stored one from the last
1421          * notification, if any. If this is a device that
1422          * doesn't implement this, this has no effect since
1423          * both values are the same and zero.
1424          */
1425         if (vif->type == NL80211_IFTYPE_ADHOC)
1426                 priv->bt_traffic_load = priv->last_bt_traffic_load;
1427 }
1428
1429 void iwl_mac_remove_interface(struct ieee80211_hw *hw,
1430                               struct ieee80211_vif *vif)
1431 {
1432         struct iwl_priv *priv = hw->priv;
1433         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1434
1435         IWL_DEBUG_MAC80211(priv, "enter\n");
1436
1437         mutex_lock(&priv->mutex);
1438
1439         WARN_ON(ctx->vif != vif);
1440         ctx->vif = NULL;
1441
1442         iwl_teardown_interface(priv, vif, false);
1443
1444         mutex_unlock(&priv->mutex);
1445
1446         IWL_DEBUG_MAC80211(priv, "leave\n");
1447
1448 }
1449
1450 int iwl_alloc_txq_mem(struct iwl_priv *priv)
1451 {
1452         if (!priv->txq)
1453                 priv->txq = kzalloc(
1454                         sizeof(struct iwl_tx_queue) *
1455                                 priv->cfg->base_params->num_of_queues,
1456                         GFP_KERNEL);
1457         if (!priv->txq) {
1458                 IWL_ERR(priv, "Not enough memory for txq\n");
1459                 return -ENOMEM;
1460         }
1461         return 0;
1462 }
1463
1464 void iwl_free_txq_mem(struct iwl_priv *priv)
1465 {
1466         kfree(priv->txq);
1467         priv->txq = NULL;
1468 }
1469
1470 #ifdef CONFIG_IWLWIFI_DEBUGFS
1471
1472 #define IWL_TRAFFIC_DUMP_SIZE   (IWL_TRAFFIC_ENTRY_SIZE * IWL_TRAFFIC_ENTRIES)
1473
1474 void iwl_reset_traffic_log(struct iwl_priv *priv)
1475 {
1476         priv->tx_traffic_idx = 0;
1477         priv->rx_traffic_idx = 0;
1478         if (priv->tx_traffic)
1479                 memset(priv->tx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
1480         if (priv->rx_traffic)
1481                 memset(priv->rx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
1482 }
1483
1484 int iwl_alloc_traffic_mem(struct iwl_priv *priv)
1485 {
1486         u32 traffic_size = IWL_TRAFFIC_DUMP_SIZE;
1487
1488         if (iwl_debug_level & IWL_DL_TX) {
1489                 if (!priv->tx_traffic) {
1490                         priv->tx_traffic =
1491                                 kzalloc(traffic_size, GFP_KERNEL);
1492                         if (!priv->tx_traffic)
1493                                 return -ENOMEM;
1494                 }
1495         }
1496         if (iwl_debug_level & IWL_DL_RX) {
1497                 if (!priv->rx_traffic) {
1498                         priv->rx_traffic =
1499                                 kzalloc(traffic_size, GFP_KERNEL);
1500                         if (!priv->rx_traffic)
1501                                 return -ENOMEM;
1502                 }
1503         }
1504         iwl_reset_traffic_log(priv);
1505         return 0;
1506 }
1507
1508 void iwl_free_traffic_mem(struct iwl_priv *priv)
1509 {
1510         kfree(priv->tx_traffic);
1511         priv->tx_traffic = NULL;
1512
1513         kfree(priv->rx_traffic);
1514         priv->rx_traffic = NULL;
1515 }
1516
1517 void iwl_dbg_log_tx_data_frame(struct iwl_priv *priv,
1518                       u16 length, struct ieee80211_hdr *header)
1519 {
1520         __le16 fc;
1521         u16 len;
1522
1523         if (likely(!(iwl_debug_level & IWL_DL_TX)))
1524                 return;
1525
1526         if (!priv->tx_traffic)
1527                 return;
1528
1529         fc = header->frame_control;
1530         if (ieee80211_is_data(fc)) {
1531                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
1532                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
1533                 memcpy((priv->tx_traffic +
1534                        (priv->tx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
1535                        header, len);
1536                 priv->tx_traffic_idx =
1537                         (priv->tx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
1538         }
1539 }
1540
1541 void iwl_dbg_log_rx_data_frame(struct iwl_priv *priv,
1542                       u16 length, struct ieee80211_hdr *header)
1543 {
1544         __le16 fc;
1545         u16 len;
1546
1547         if (likely(!(iwl_debug_level & IWL_DL_RX)))
1548                 return;
1549
1550         if (!priv->rx_traffic)
1551                 return;
1552
1553         fc = header->frame_control;
1554         if (ieee80211_is_data(fc)) {
1555                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
1556                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
1557                 memcpy((priv->rx_traffic +
1558                        (priv->rx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
1559                        header, len);
1560                 priv->rx_traffic_idx =
1561                         (priv->rx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
1562         }
1563 }
1564
1565 const char *get_mgmt_string(int cmd)
1566 {
1567         switch (cmd) {
1568                 IWL_CMD(MANAGEMENT_ASSOC_REQ);
1569                 IWL_CMD(MANAGEMENT_ASSOC_RESP);
1570                 IWL_CMD(MANAGEMENT_REASSOC_REQ);
1571                 IWL_CMD(MANAGEMENT_REASSOC_RESP);
1572                 IWL_CMD(MANAGEMENT_PROBE_REQ);
1573                 IWL_CMD(MANAGEMENT_PROBE_RESP);
1574                 IWL_CMD(MANAGEMENT_BEACON);
1575                 IWL_CMD(MANAGEMENT_ATIM);
1576                 IWL_CMD(MANAGEMENT_DISASSOC);
1577                 IWL_CMD(MANAGEMENT_AUTH);
1578                 IWL_CMD(MANAGEMENT_DEAUTH);
1579                 IWL_CMD(MANAGEMENT_ACTION);
1580         default:
1581                 return "UNKNOWN";
1582
1583         }
1584 }
1585
1586 const char *get_ctrl_string(int cmd)
1587 {
1588         switch (cmd) {
1589                 IWL_CMD(CONTROL_BACK_REQ);
1590                 IWL_CMD(CONTROL_BACK);
1591                 IWL_CMD(CONTROL_PSPOLL);
1592                 IWL_CMD(CONTROL_RTS);
1593                 IWL_CMD(CONTROL_CTS);
1594                 IWL_CMD(CONTROL_ACK);
1595                 IWL_CMD(CONTROL_CFEND);
1596                 IWL_CMD(CONTROL_CFENDACK);
1597         default:
1598                 return "UNKNOWN";
1599
1600         }
1601 }
1602
1603 void iwl_clear_traffic_stats(struct iwl_priv *priv)
1604 {
1605         memset(&priv->tx_stats, 0, sizeof(struct traffic_stats));
1606         memset(&priv->rx_stats, 0, sizeof(struct traffic_stats));
1607 }
1608
1609 /*
1610  * if CONFIG_IWLWIFI_DEBUGFS defined, iwl_update_stats function will
1611  * record all the MGMT, CTRL and DATA pkt for both TX and Rx pass.
1612  * Use debugFs to display the rx/rx_statistics
1613  * if CONFIG_IWLWIFI_DEBUGFS not being defined, then no MGMT and CTRL
1614  * information will be recorded, but DATA pkt still will be recorded
1615  * for the reason of iwl_led.c need to control the led blinking based on
1616  * number of tx and rx data.
1617  *
1618  */
1619 void iwl_update_stats(struct iwl_priv *priv, bool is_tx, __le16 fc, u16 len)
1620 {
1621         struct traffic_stats    *stats;
1622
1623         if (is_tx)
1624                 stats = &priv->tx_stats;
1625         else
1626                 stats = &priv->rx_stats;
1627
1628         if (ieee80211_is_mgmt(fc)) {
1629                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
1630                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
1631                         stats->mgmt[MANAGEMENT_ASSOC_REQ]++;
1632                         break;
1633                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
1634                         stats->mgmt[MANAGEMENT_ASSOC_RESP]++;
1635                         break;
1636                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
1637                         stats->mgmt[MANAGEMENT_REASSOC_REQ]++;
1638                         break;
1639                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
1640                         stats->mgmt[MANAGEMENT_REASSOC_RESP]++;
1641                         break;
1642                 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
1643                         stats->mgmt[MANAGEMENT_PROBE_REQ]++;
1644                         break;
1645                 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
1646                         stats->mgmt[MANAGEMENT_PROBE_RESP]++;
1647                         break;
1648                 case cpu_to_le16(IEEE80211_STYPE_BEACON):
1649                         stats->mgmt[MANAGEMENT_BEACON]++;
1650                         break;
1651                 case cpu_to_le16(IEEE80211_STYPE_ATIM):
1652                         stats->mgmt[MANAGEMENT_ATIM]++;
1653                         break;
1654                 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
1655                         stats->mgmt[MANAGEMENT_DISASSOC]++;
1656                         break;
1657                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
1658                         stats->mgmt[MANAGEMENT_AUTH]++;
1659                         break;
1660                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
1661                         stats->mgmt[MANAGEMENT_DEAUTH]++;
1662                         break;
1663                 case cpu_to_le16(IEEE80211_STYPE_ACTION):
1664                         stats->mgmt[MANAGEMENT_ACTION]++;
1665                         break;
1666                 }
1667         } else if (ieee80211_is_ctl(fc)) {
1668                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
1669                 case cpu_to_le16(IEEE80211_STYPE_BACK_REQ):
1670                         stats->ctrl[CONTROL_BACK_REQ]++;
1671                         break;
1672                 case cpu_to_le16(IEEE80211_STYPE_BACK):
1673                         stats->ctrl[CONTROL_BACK]++;
1674                         break;
1675                 case cpu_to_le16(IEEE80211_STYPE_PSPOLL):
1676                         stats->ctrl[CONTROL_PSPOLL]++;
1677                         break;
1678                 case cpu_to_le16(IEEE80211_STYPE_RTS):
1679                         stats->ctrl[CONTROL_RTS]++;
1680                         break;
1681                 case cpu_to_le16(IEEE80211_STYPE_CTS):
1682                         stats->ctrl[CONTROL_CTS]++;
1683                         break;
1684                 case cpu_to_le16(IEEE80211_STYPE_ACK):
1685                         stats->ctrl[CONTROL_ACK]++;
1686                         break;
1687                 case cpu_to_le16(IEEE80211_STYPE_CFEND):
1688                         stats->ctrl[CONTROL_CFEND]++;
1689                         break;
1690                 case cpu_to_le16(IEEE80211_STYPE_CFENDACK):
1691                         stats->ctrl[CONTROL_CFENDACK]++;
1692                         break;
1693                 }
1694         } else {
1695                 /* data */
1696                 stats->data_cnt++;
1697                 stats->data_bytes += len;
1698         }
1699 }
1700 #endif
1701
1702 static void iwl_force_rf_reset(struct iwl_priv *priv)
1703 {
1704         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1705                 return;
1706
1707         if (!iwl_is_any_associated(priv)) {
1708                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
1709                 return;
1710         }
1711         /*
1712          * There is no easy and better way to force reset the radio,
1713          * the only known method is switching channel which will force to
1714          * reset and tune the radio.
1715          * Use internal short scan (single channel) operation to should
1716          * achieve this objective.
1717          * Driver should reset the radio when number of consecutive missed
1718          * beacon, or any other uCode error condition detected.
1719          */
1720         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
1721         iwl_internal_short_hw_scan(priv);
1722 }
1723
1724
1725 int iwl_force_reset(struct iwl_priv *priv, int mode, bool external)
1726 {
1727         struct iwl_force_reset *force_reset;
1728
1729         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1730                 return -EINVAL;
1731
1732         if (mode >= IWL_MAX_FORCE_RESET) {
1733                 IWL_DEBUG_INFO(priv, "invalid reset request.\n");
1734                 return -EINVAL;
1735         }
1736         force_reset = &priv->force_reset[mode];
1737         force_reset->reset_request_count++;
1738         if (!external) {
1739                 if (force_reset->last_force_reset_jiffies &&
1740                     time_after(force_reset->last_force_reset_jiffies +
1741                     force_reset->reset_duration, jiffies)) {
1742                         IWL_DEBUG_INFO(priv, "force reset rejected\n");
1743                         force_reset->reset_reject_count++;
1744                         return -EAGAIN;
1745                 }
1746         }
1747         force_reset->reset_success_count++;
1748         force_reset->last_force_reset_jiffies = jiffies;
1749         IWL_DEBUG_INFO(priv, "perform force reset (%d)\n", mode);
1750         switch (mode) {
1751         case IWL_RF_RESET:
1752                 iwl_force_rf_reset(priv);
1753                 break;
1754         case IWL_FW_RESET:
1755                 /*
1756                  * if the request is from external(ex: debugfs),
1757                  * then always perform the request in regardless the module
1758                  * parameter setting
1759                  * if the request is from internal (uCode error or driver
1760                  * detect failure), then fw_restart module parameter
1761                  * need to be check before performing firmware reload
1762                  */
1763                 if (!external && !priv->cfg->mod_params->restart_fw) {
1764                         IWL_DEBUG_INFO(priv, "Cancel firmware reload based on "
1765                                        "module parameter setting\n");
1766                         break;
1767                 }
1768                 IWL_ERR(priv, "On demand firmware reload\n");
1769                 iwlagn_fw_error(priv, true);
1770                 break;
1771         }
1772         return 0;
1773 }
1774
1775 int iwl_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1776                              enum nl80211_iftype newtype, bool newp2p)
1777 {
1778         struct iwl_priv *priv = hw->priv;
1779         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1780         struct iwl_rxon_context *tmp;
1781         u32 interface_modes;
1782         int err;
1783
1784         newtype = ieee80211_iftype_p2p(newtype, newp2p);
1785
1786         mutex_lock(&priv->mutex);
1787
1788         interface_modes = ctx->interface_modes | ctx->exclusive_interface_modes;
1789
1790         if (!(interface_modes & BIT(newtype))) {
1791                 err = -EBUSY;
1792                 goto out;
1793         }
1794
1795         if (ctx->exclusive_interface_modes & BIT(newtype)) {
1796                 for_each_context(priv, tmp) {
1797                         if (ctx == tmp)
1798                                 continue;
1799
1800                         if (!tmp->vif)
1801                                 continue;
1802
1803                         /*
1804                          * The current mode switch would be exclusive, but
1805                          * another context is active ... refuse the switch.
1806                          */
1807                         err = -EBUSY;
1808                         goto out;
1809                 }
1810         }
1811
1812         /* success */
1813         iwl_teardown_interface(priv, vif, true);
1814         vif->type = newtype;
1815         err = iwl_setup_interface(priv, ctx);
1816         WARN_ON(err);
1817         /*
1818          * We've switched internally, but submitting to the
1819          * device may have failed for some reason. Mask this
1820          * error, because otherwise mac80211 will not switch
1821          * (and set the interface type back) and we'll be
1822          * out of sync with it.
1823          */
1824         err = 0;
1825
1826  out:
1827         mutex_unlock(&priv->mutex);
1828         return err;
1829 }
1830
1831 /*
1832  * On every watchdog tick we check (latest) time stamp. If it does not
1833  * change during timeout period and queue is not empty we reset firmware.
1834  */
1835 static int iwl_check_stuck_queue(struct iwl_priv *priv, int cnt)
1836 {
1837         struct iwl_tx_queue *txq = &priv->txq[cnt];
1838         struct iwl_queue *q = &txq->q;
1839         unsigned long timeout;
1840         int ret;
1841
1842         if (q->read_ptr == q->write_ptr) {
1843                 txq->time_stamp = jiffies;
1844                 return 0;
1845         }
1846
1847         timeout = txq->time_stamp +
1848                   msecs_to_jiffies(priv->cfg->base_params->wd_timeout);
1849
1850         if (time_after(jiffies, timeout)) {
1851                 IWL_ERR(priv, "Queue %d stuck for %u ms.\n",
1852                                 q->id, priv->cfg->base_params->wd_timeout);
1853                 ret = iwl_force_reset(priv, IWL_FW_RESET, false);
1854                 return (ret == -EAGAIN) ? 0 : 1;
1855         }
1856
1857         return 0;
1858 }
1859
1860 /*
1861  * Making watchdog tick be a quarter of timeout assure we will
1862  * discover the queue hung between timeout and 1.25*timeout
1863  */
1864 #define IWL_WD_TICK(timeout) ((timeout) / 4)
1865
1866 /*
1867  * Watchdog timer callback, we check each tx queue for stuck, if if hung
1868  * we reset the firmware. If everything is fine just rearm the timer.
1869  */
1870 void iwl_bg_watchdog(unsigned long data)
1871 {
1872         struct iwl_priv *priv = (struct iwl_priv *)data;
1873         int cnt;
1874         unsigned long timeout;
1875
1876         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1877                 return;
1878
1879         timeout = priv->cfg->base_params->wd_timeout;
1880         if (timeout == 0)
1881                 return;
1882
1883         /* monitor and check for stuck cmd queue */
1884         if (iwl_check_stuck_queue(priv, priv->cmd_queue))
1885                 return;
1886
1887         /* monitor and check for other stuck queues */
1888         if (iwl_is_any_associated(priv)) {
1889                 for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
1890                         /* skip as we already checked the command queue */
1891                         if (cnt == priv->cmd_queue)
1892                                 continue;
1893                         if (iwl_check_stuck_queue(priv, cnt))
1894                                 return;
1895                 }
1896         }
1897
1898         mod_timer(&priv->watchdog, jiffies +
1899                   msecs_to_jiffies(IWL_WD_TICK(timeout)));
1900 }
1901
1902 void iwl_setup_watchdog(struct iwl_priv *priv)
1903 {
1904         unsigned int timeout = priv->cfg->base_params->wd_timeout;
1905
1906         if (timeout)
1907                 mod_timer(&priv->watchdog,
1908                           jiffies + msecs_to_jiffies(IWL_WD_TICK(timeout)));
1909         else
1910                 del_timer(&priv->watchdog);
1911 }
1912
1913 /*
1914  * extended beacon time format
1915  * time in usec will be changed into a 32-bit value in extended:internal format
1916  * the extended part is the beacon counts
1917  * the internal part is the time in usec within one beacon interval
1918  */
1919 u32 iwl_usecs_to_beacons(struct iwl_priv *priv, u32 usec, u32 beacon_interval)
1920 {
1921         u32 quot;
1922         u32 rem;
1923         u32 interval = beacon_interval * TIME_UNIT;
1924
1925         if (!interval || !usec)
1926                 return 0;
1927
1928         quot = (usec / interval) &
1929                 (iwl_beacon_time_mask_high(priv,
1930                 priv->hw_params.beacon_time_tsf_bits) >>
1931                 priv->hw_params.beacon_time_tsf_bits);
1932         rem = (usec % interval) & iwl_beacon_time_mask_low(priv,
1933                                    priv->hw_params.beacon_time_tsf_bits);
1934
1935         return (quot << priv->hw_params.beacon_time_tsf_bits) + rem;
1936 }
1937
1938 /* base is usually what we get from ucode with each received frame,
1939  * the same as HW timer counter counting down
1940  */
1941 __le32 iwl_add_beacon_time(struct iwl_priv *priv, u32 base,
1942                            u32 addon, u32 beacon_interval)
1943 {
1944         u32 base_low = base & iwl_beacon_time_mask_low(priv,
1945                                         priv->hw_params.beacon_time_tsf_bits);
1946         u32 addon_low = addon & iwl_beacon_time_mask_low(priv,
1947                                         priv->hw_params.beacon_time_tsf_bits);
1948         u32 interval = beacon_interval * TIME_UNIT;
1949         u32 res = (base & iwl_beacon_time_mask_high(priv,
1950                                 priv->hw_params.beacon_time_tsf_bits)) +
1951                                 (addon & iwl_beacon_time_mask_high(priv,
1952                                 priv->hw_params.beacon_time_tsf_bits));
1953
1954         if (base_low > addon_low)
1955                 res += base_low - addon_low;
1956         else if (base_low < addon_low) {
1957                 res += interval + base_low - addon_low;
1958                 res += (1 << priv->hw_params.beacon_time_tsf_bits);
1959         } else
1960                 res += (1 << priv->hw_params.beacon_time_tsf_bits);
1961
1962         return cpu_to_le32(res);
1963 }
1964
1965 #ifdef CONFIG_PM
1966
1967 int iwl_pci_suspend(struct device *device)
1968 {
1969         struct pci_dev *pdev = to_pci_dev(device);
1970         struct iwl_priv *priv = pci_get_drvdata(pdev);
1971
1972         /*
1973          * This function is called when system goes into suspend state
1974          * mac80211 will call iwl_mac_stop() from the mac80211 suspend function
1975          * first but since iwl_mac_stop() has no knowledge of who the caller is,
1976          * it will not call apm_ops.stop() to stop the DMA operation.
1977          * Calling apm_ops.stop here to make sure we stop the DMA.
1978          */
1979         iwl_apm_stop(priv);
1980
1981         return 0;
1982 }
1983
1984 int iwl_pci_resume(struct device *device)
1985 {
1986         struct pci_dev *pdev = to_pci_dev(device);
1987         struct iwl_priv *priv = pci_get_drvdata(pdev);
1988         bool hw_rfkill = false;
1989
1990         /*
1991          * We disable the RETRY_TIMEOUT register (0x41) to keep
1992          * PCI Tx retries from interfering with C3 CPU state.
1993          */
1994         pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
1995
1996         iwl_enable_interrupts(priv);
1997
1998         if (!(iwl_read32(priv, CSR_GP_CNTRL) &
1999                                 CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
2000                 hw_rfkill = true;
2001
2002         if (hw_rfkill)
2003                 set_bit(STATUS_RF_KILL_HW, &priv->status);
2004         else
2005                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
2006
2007         wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rfkill);
2008
2009         return 0;
2010 }
2011
2012 const struct dev_pm_ops iwl_pm_ops = {
2013         .suspend = iwl_pci_suspend,
2014         .resume = iwl_pci_resume,
2015         .freeze = iwl_pci_suspend,
2016         .thaw = iwl_pci_resume,
2017         .poweroff = iwl_pci_suspend,
2018         .restore = iwl_pci_resume,
2019 };
2020
2021 #endif /* CONFIG_PM */