Pileus Git - ~andy/linux/blob - drivers/net/wireless/iwlwifi/iwl-core.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/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 #include "iwl-agn.h"
  45
  46 u32 iwl_debug_level;
  47
  48 const u8 iwl_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  49
  50 #define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
  51 #define MAX_BIT_RATE_20_MHZ 72 /* Mbps */
  52 static void iwlcore_init_ht_hw_capab(const struct iwl_priv *priv,
  53                               struct ieee80211_sta_ht_cap *ht_info,
  54                               enum ieee80211_band band)
  55 {
  56         u16 max_bit_rate = 0;
  57         u8 rx_chains_num = priv->hw_params.rx_chains_num;
  58         u8 tx_chains_num = priv->hw_params.tx_chains_num;
  59
  60         ht_info->cap = 0;
  61         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
  62
  63         ht_info->ht_supported = true;
  64
  65         if (priv->cfg->ht_params &&
  66             priv->cfg->ht_params->ht_greenfield_support)
  67                 ht_info->cap |= IEEE80211_HT_CAP_GRN_FLD;
  68         ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
  69         max_bit_rate = MAX_BIT_RATE_20_MHZ;
  70         if (priv->hw_params.ht40_channel & BIT(band)) {
  71                 ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
  72                 ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
  73                 ht_info->mcs.rx_mask[4] = 0x01;
  74                 max_bit_rate = MAX_BIT_RATE_40_MHZ;
  75         }
  76
  77         if (iwlagn_mod_params.amsdu_size_8K)
  78                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
  79
  80         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
  81         if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_factor)
  82                 ht_info->ampdu_factor = priv->cfg->bt_params->ampdu_factor;
  83         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
  84         if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_density)
  85                 ht_info->ampdu_density = priv->cfg->bt_params->ampdu_density;
  86
  87         ht_info->mcs.rx_mask[0] = 0xFF;
  88         if (rx_chains_num >= 2)
  89                 ht_info->mcs.rx_mask[1] = 0xFF;
  90         if (rx_chains_num >= 3)
  91                 ht_info->mcs.rx_mask[2] = 0xFF;
  92
  93         /* Highest supported Rx data rate */
  94         max_bit_rate *= rx_chains_num;
  95         WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
  96         ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
  97
  98         /* Tx MCS capabilities */
  99         ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
 100         if (tx_chains_num != rx_chains_num) {
 101                 ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
 102                 ht_info->mcs.tx_params |= ((tx_chains_num - 1) <<
 103                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
 104         }
 105 }
 106
 107 /**
 108  * iwlcore_init_geos - Initialize mac80211's geo/channel info based from eeprom
 109  */
 110 int iwlcore_init_geos(struct iwl_priv *priv)
 111 {
 112         struct iwl_channel_info *ch;
 113         struct ieee80211_supported_band *sband;
 114         struct ieee80211_channel *channels;
 115         struct ieee80211_channel *geo_ch;
 116         struct ieee80211_rate *rates;
 117         int i = 0;
 118         s8 max_tx_power = IWLAGN_TX_POWER_TARGET_POWER_MIN;
 119
 120         if (priv->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
 121             priv->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
 122                 IWL_DEBUG_INFO(priv, "Geography modes already initialized.\n");
 123                 set_bit(STATUS_GEO_CONFIGURED, &priv->status);
 124                 return 0;
 125         }
 126
 127         channels = kzalloc(sizeof(struct ieee80211_channel) *
 128                            priv->channel_count, GFP_KERNEL);
 129         if (!channels)
 130                 return -ENOMEM;
 131
 132         rates = kzalloc((sizeof(struct ieee80211_rate) * IWL_RATE_COUNT_LEGACY),
 133                         GFP_KERNEL);
 134         if (!rates) {
 135                 kfree(channels);
 136                 return -ENOMEM;
 137         }
 138
 139         /* 5.2GHz channels start after the 2.4GHz channels */
 140         sband = &priv->bands[IEEE80211_BAND_5GHZ];
 141         sband->channels = &channels[ARRAY_SIZE(iwl_eeprom_band_1)];
 142         /* just OFDM */
 143         sband->bitrates = &rates[IWL_FIRST_OFDM_RATE];
 144         sband->n_bitrates = IWL_RATE_COUNT_LEGACY - IWL_FIRST_OFDM_RATE;
 145
 146         if (priv->cfg->sku & EEPROM_SKU_CAP_11N_ENABLE)
 147                 iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
 148                                          IEEE80211_BAND_5GHZ);
 149
 150         sband = &priv->bands[IEEE80211_BAND_2GHZ];
 151         sband->channels = channels;
 152         /* OFDM & CCK */
 153         sband->bitrates = rates;
 154         sband->n_bitrates = IWL_RATE_COUNT_LEGACY;
 155
 156         if (priv->cfg->sku & EEPROM_SKU_CAP_11N_ENABLE)
 157                 iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
 158                                          IEEE80211_BAND_2GHZ);
 159
 160         priv->ieee_channels = channels;
 161         priv->ieee_rates = rates;
 162
 163         for (i = 0;  i < priv->channel_count; i++) {
 164                 ch = &priv->channel_info[i];
 165
 166                 /* FIXME: might be removed if scan is OK */
 167                 if (!is_channel_valid(ch))
 168                         continue;
 169
 170                 sband =  &priv->bands[ch->band];
 171
 172                 geo_ch = &sband->channels[sband->n_channels++];
 173
 174                 geo_ch->center_freq =
 175                         ieee80211_channel_to_frequency(ch->channel, ch->band);
 176                 geo_ch->max_power = ch->max_power_avg;
 177                 geo_ch->max_antenna_gain = 0xff;
 178                 geo_ch->hw_value = ch->channel;
 179
 180                 if (is_channel_valid(ch)) {
 181                         if (!(ch->flags & EEPROM_CHANNEL_IBSS))
 182                                 geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;
 183
 184                         if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
 185                                 geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 186
 187                         if (ch->flags & EEPROM_CHANNEL_RADAR)
 188                                 geo_ch->flags |= IEEE80211_CHAN_RADAR;
 189
 190                         geo_ch->flags |= ch->ht40_extension_channel;
 191
 192                         if (ch->max_power_avg > max_tx_power)
 193                                 max_tx_power = ch->max_power_avg;
 194                 } else {
 195                         geo_ch->flags |= IEEE80211_CHAN_DISABLED;
 196                 }
 197
 198                 IWL_DEBUG_INFO(priv, "Channel %d Freq=%d[%sGHz] %s flag=0x%X\n",
 199                                 ch->channel, geo_ch->center_freq,
 200                                 is_channel_a_band(ch) ?  "5.2" : "2.4",
 201                                 geo_ch->flags & IEEE80211_CHAN_DISABLED ?
 202                                 "restricted" : "valid",
 203                                  geo_ch->flags);
 204         }
 205
 206         priv->tx_power_device_lmt = max_tx_power;
 207         priv->tx_power_user_lmt = max_tx_power;
 208         priv->tx_power_next = max_tx_power;
 209
 210         if ((priv->bands[IEEE80211_BAND_5GHZ].n_channels == 0) &&
 211              priv->cfg->sku & EEPROM_SKU_CAP_BAND_52GHZ) {
 212                 char buf[32];
 213                 priv->bus.ops->get_hw_id(&priv->bus, buf, sizeof(buf));
 214                 IWL_INFO(priv, "Incorrectly detected BG card as ABG. "
 215                         "Please send your %s to maintainer.\n", buf);
 216                 priv->cfg->sku &= ~EEPROM_SKU_CAP_BAND_52GHZ;
 217         }
 218
 219         IWL_INFO(priv, "Tunable channels: %d 802.11bg, %d 802.11a channels\n",
 220                    priv->bands[IEEE80211_BAND_2GHZ].n_channels,
 221                    priv->bands[IEEE80211_BAND_5GHZ].n_channels);
 222
 223         set_bit(STATUS_GEO_CONFIGURED, &priv->status);
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * iwlcore_free_geos - undo allocations in iwlcore_init_geos
 230  */
 231 void iwlcore_free_geos(struct iwl_priv *priv)
 232 {
 233         kfree(priv->ieee_channels);
 234         kfree(priv->ieee_rates);
 235         clear_bit(STATUS_GEO_CONFIGURED, &priv->status);
 236 }
 237
 238 static bool iwl_is_channel_extension(struct iwl_priv *priv,
 239                                      enum ieee80211_band band,
 240                                      u16 channel, u8 extension_chan_offset)
 241 {
 242         const struct iwl_channel_info *ch_info;
 243
 244         ch_info = iwl_get_channel_info(priv, band, channel);
 245         if (!is_channel_valid(ch_info))
 246                 return false;
 247
 248         if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
 249                 return !(ch_info->ht40_extension_channel &
 250                                         IEEE80211_CHAN_NO_HT40PLUS);
 251         else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
 252                 return !(ch_info->ht40_extension_channel &
 253                                         IEEE80211_CHAN_NO_HT40MINUS);
 254
 255         return false;
 256 }
 257
 258 bool iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
 259                             struct iwl_rxon_context *ctx,
 260                             struct ieee80211_sta_ht_cap *ht_cap)
 261 {
 262         if (!ctx->ht.enabled || !ctx->ht.is_40mhz)
 263                 return false;
 264
 265         /*
 266          * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
 267          * the bit will not set if it is pure 40MHz case
 268          */
 269         if (ht_cap && !ht_cap->ht_supported)
 270                 return false;
 271
 272 #ifdef CONFIG_IWLWIFI_DEBUGFS
 273         if (priv->disable_ht40)
 274                 return false;
 275 #endif
 276
 277         return iwl_is_channel_extension(priv, priv->band,
 278                         le16_to_cpu(ctx->staging.channel),
 279                         ctx->ht.extension_chan_offset);
 280 }
 281
 282 static u16 iwl_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
 283 {
 284         u16 new_val;
 285         u16 beacon_factor;
 286
 287         /*
 288          * If mac80211 hasn't given us a beacon interval, program
 289          * the default into the device (not checking this here
 290          * would cause the adjustment below to return the maximum
 291          * value, which may break PAN.)
 292          */
 293         if (!beacon_val)
 294                 return DEFAULT_BEACON_INTERVAL;
 295
 296         /*
 297          * If the beacon interval we obtained from the peer
 298          * is too large, we'll have to wake up more often
 299          * (and in IBSS case, we'll beacon too much)
 300          *
 301          * For example, if max_beacon_val is 4096, and the
 302          * requested beacon interval is 7000, we'll have to
 303          * use 3500 to be able to wake up on the beacons.
 304          *
 305          * This could badly influence beacon detection stats.
 306          */
 307
 308         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
 309         new_val = beacon_val / beacon_factor;
 310
 311         if (!new_val)
 312                 new_val = max_beacon_val;
 313
 314         return new_val;
 315 }
 316
 317 int iwl_send_rxon_timing(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 318 {
 319         u64 tsf;
 320         s32 interval_tm, rem;
 321         struct ieee80211_conf *conf = NULL;
 322         u16 beacon_int;
 323         struct ieee80211_vif *vif = ctx->vif;
 324
 325         conf = ieee80211_get_hw_conf(priv->hw);
 326
 327         lockdep_assert_held(&priv->mutex);
 328
 329         memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));
 330
 331         ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
 332         ctx->timing.listen_interval = cpu_to_le16(conf->listen_interval);
 333
 334         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
 335
 336         /*
 337          * TODO: For IBSS we need to get atim_window from mac80211,
 338          *       for now just always use 0
 339          */
 340         ctx->timing.atim_window = 0;
 341
 342         if (ctx->ctxid == IWL_RXON_CTX_PAN &&
 343             (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
 344             iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
 345             priv->contexts[IWL_RXON_CTX_BSS].vif &&
 346             priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
 347                 ctx->timing.beacon_interval =
 348                         priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
 349                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 350         } else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
 351                    iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
 352                    priv->contexts[IWL_RXON_CTX_PAN].vif &&
 353                    priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
 354                    (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
 355                     !ctx->vif->bss_conf.beacon_int)) {
 356                 ctx->timing.beacon_interval =
 357                         priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
 358                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 359         } else {
 360                 beacon_int = iwl_adjust_beacon_interval(beacon_int,
 361                                 priv->hw_params.max_beacon_itrvl * TIME_UNIT);
 362                 ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
 363         }
 364
 365         tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
 366         interval_tm = beacon_int * TIME_UNIT;
 367         rem = do_div(tsf, interval_tm);
 368         ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
 369
 370         ctx->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ?: 1) : 1;
 371
 372         IWL_DEBUG_ASSOC(priv,
 373                         "beacon interval %d beacon timer %d beacon tim %d\n",
 374                         le16_to_cpu(ctx->timing.beacon_interval),
 375                         le32_to_cpu(ctx->timing.beacon_init_val),
 376                         le16_to_cpu(ctx->timing.atim_window));
 377
 378         return iwl_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
 379                                 sizeof(ctx->timing), &ctx->timing);
 380 }
 381
 382 void iwl_set_rxon_hwcrypto(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 383                            int hw_decrypt)
 384 {
 385         struct iwl_rxon_cmd *rxon = &ctx->staging;
 386
 387         if (hw_decrypt)
 388                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
 389         else
 390                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
 391
 392 }
 393
 394 /* validate RXON structure is valid */
 395 int iwl_check_rxon_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 396 {
 397         struct iwl_rxon_cmd *rxon = &ctx->staging;
 398         u32 errors = 0;
 399
 400         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
 401                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
 402                         IWL_WARN(priv, "check 2.4G: wrong narrow\n");
 403                         errors |= BIT(0);
 404                 }
 405                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
 406                         IWL_WARN(priv, "check 2.4G: wrong radar\n");
 407                         errors |= BIT(1);
 408                 }
 409         } else {
 410                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
 411                         IWL_WARN(priv, "check 5.2G: not short slot!\n");
 412                         errors |= BIT(2);
 413                 }
 414                 if (rxon->flags & RXON_FLG_CCK_MSK) {
 415                         IWL_WARN(priv, "check 5.2G: CCK!\n");
 416                         errors |= BIT(3);
 417                 }
 418         }
 419         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
 420                 IWL_WARN(priv, "mac/bssid mcast!\n");
 421                 errors |= BIT(4);
 422         }
 423
 424         /* make sure basic rates 6Mbps and 1Mbps are supported */
 425         if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
 426             (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
 427                 IWL_WARN(priv, "neither 1 nor 6 are basic\n");
 428                 errors |= BIT(5);
 429         }
 430
 431         if (le16_to_cpu(rxon->assoc_id) > 2007) {
 432                 IWL_WARN(priv, "aid > 2007\n");
 433                 errors |= BIT(6);
 434         }
 435
 436         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
 437                         == (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
 438                 IWL_WARN(priv, "CCK and short slot\n");
 439                 errors |= BIT(7);
 440         }
 441
 442         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
 443                         == (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
 444                 IWL_WARN(priv, "CCK and auto detect");
 445                 errors |= BIT(8);
 446         }
 447
 448         if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
 449                             RXON_FLG_TGG_PROTECT_MSK)) ==
 450                             RXON_FLG_TGG_PROTECT_MSK) {
 451                 IWL_WARN(priv, "TGg but no auto-detect\n");
 452                 errors |= BIT(9);
 453         }
 454
 455         if (rxon->channel == 0) {
 456                 IWL_WARN(priv, "zero channel is invalid\n");
 457                 errors |= BIT(10);
 458         }
 459
 460         WARN(errors, "Invalid RXON (%#x), channel %d",
 461              errors, le16_to_cpu(rxon->channel));
 462
 463         return errors ? -EINVAL : 0;
 464 }
 465
 466 /**
 467  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 468  * @priv: staging_rxon is compared to active_rxon
 469  *
 470  * If the RXON structure is changing enough to require a new tune,
 471  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
 472  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
 473  */
 474 int iwl_full_rxon_required(struct iwl_priv *priv,
 475                            struct iwl_rxon_context *ctx)
 476 {
 477         const struct iwl_rxon_cmd *staging = &ctx->staging;
 478         const struct iwl_rxon_cmd *active = &ctx->active;
 479
 480 #define CHK(cond)                                                       \
 481         if ((cond)) {                                                   \
 482                 IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");   \
 483                 return 1;                                               \
 484         }
 485
 486 #define CHK_NEQ(c1, c2)                                         \
 487         if ((c1) != (c2)) {                                     \
 488                 IWL_DEBUG_INFO(priv, "need full RXON - "        \
 489                                #c1 " != " #c2 " - %d != %d\n",  \
 490                                (c1), (c2));                     \
 491                 return 1;                                       \
 492         }
 493
 494         /* These items are only settable from the full RXON command */
 495         CHK(!iwl_is_associated_ctx(ctx));
 496         CHK(compare_ether_addr(staging->bssid_addr, active->bssid_addr));
 497         CHK(compare_ether_addr(staging->node_addr, active->node_addr));
 498         CHK(compare_ether_addr(staging->wlap_bssid_addr,
 499                                 active->wlap_bssid_addr));
 500         CHK_NEQ(staging->dev_type, active->dev_type);
 501         CHK_NEQ(staging->channel, active->channel);
 502         CHK_NEQ(staging->air_propagation, active->air_propagation);
 503         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
 504                 active->ofdm_ht_single_stream_basic_rates);
 505         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
 506                 active->ofdm_ht_dual_stream_basic_rates);
 507         CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
 508                 active->ofdm_ht_triple_stream_basic_rates);
 509         CHK_NEQ(staging->assoc_id, active->assoc_id);
 510
 511         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
 512          * be updated with the RXON_ASSOC command -- however only some
 513          * flag transitions are allowed using RXON_ASSOC */
 514
 515         /* Check if we are not switching bands */
 516         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
 517                 active->flags & RXON_FLG_BAND_24G_MSK);
 518
 519         /* Check if we are switching association toggle */
 520         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
 521                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
 522
 523 #undef CHK
 524 #undef CHK_NEQ
 525
 526         return 0;
 527 }
 528
 529 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
 530                              struct iwl_ht_config *ht_conf,
 531                              struct iwl_rxon_context *ctx)
 532 {
 533         struct iwl_rxon_cmd *rxon = &ctx->staging;
 534
 535         if (!ctx->ht.enabled) {
 536                 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 537                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
 538                         RXON_FLG_HT40_PROT_MSK |
 539                         RXON_FLG_HT_PROT_MSK);
 540                 return;
 541         }
 542
 543         /* FIXME: if the definition of ht.protection changed, the "translation"
 544          * will be needed for rxon->flags
 545          */
 546         rxon->flags |= cpu_to_le32(ctx->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
 547
 548         /* Set up channel bandwidth:
 549          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
 550         /* clear the HT channel mode before set the mode */
 551         rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 552                          RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 553         if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
 554                 /* pure ht40 */
 555                 if (ctx->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
 556                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
 557                         /* Note: control channel is opposite of extension channel */
 558                         switch (ctx->ht.extension_chan_offset) {
 559                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 560                                 rxon->flags &= ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 561                                 break;
 562                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 563                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 564                                 break;
 565                         }
 566                 } else {
 567                         /* Note: control channel is opposite of extension channel */
 568                         switch (ctx->ht.extension_chan_offset) {
 569                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 570                                 rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 571                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 572                                 break;
 573                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 574                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 575                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 576                                 break;
 577                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
 578                         default:
 579                                 /* channel location only valid if in Mixed mode */
 580                                 IWL_ERR(priv, "invalid extension channel offset\n");
 581                                 break;
 582                         }
 583                 }
 584         } else {
 585                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
 586         }
 587
 588         iwlagn_set_rxon_chain(priv, ctx);
 589
 590         IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
 591                         "extension channel offset 0x%x\n",
 592                         le32_to_cpu(rxon->flags), ctx->ht.protection,
 593                         ctx->ht.extension_chan_offset);
 594 }
 595
 596 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
 597 {
 598         struct iwl_rxon_context *ctx;
 599
 600         for_each_context(priv, ctx)
 601                 _iwl_set_rxon_ht(priv, ht_conf, ctx);
 602 }
 603
 604 /* Return valid, unused, channel for a passive scan to reset the RF */
 605 u8 iwl_get_single_channel_number(struct iwl_priv *priv,
 606                                  enum ieee80211_band band)
 607 {
 608         const struct iwl_channel_info *ch_info;
 609         int i;
 610         u8 channel = 0;
 611         u8 min, max;
 612         struct iwl_rxon_context *ctx;
 613
 614         if (band == IEEE80211_BAND_5GHZ) {
 615                 min = 14;
 616                 max = priv->channel_count;
 617         } else {
 618                 min = 0;
 619                 max = 14;
 620         }
 621
 622         for (i = min; i < max; i++) {
 623                 bool busy = false;
 624
 625                 for_each_context(priv, ctx) {
 626                         busy = priv->channel_info[i].channel ==
 627                                 le16_to_cpu(ctx->staging.channel);
 628                         if (busy)
 629                                 break;
 630                 }
 631
 632                 if (busy)
 633                         continue;
 634
 635                 channel = priv->channel_info[i].channel;
 636                 ch_info = iwl_get_channel_info(priv, band, channel);
 637                 if (is_channel_valid(ch_info))
 638                         break;
 639         }
 640
 641         return channel;
 642 }
 643
 644 /**
 645  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
 646  * @ch: requested channel as a pointer to struct ieee80211_channel
 647
 648  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 649  * in the staging RXON flag structure based on the ch->band
 650  */
 651 int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
 652                          struct iwl_rxon_context *ctx)
 653 {
 654         enum ieee80211_band band = ch->band;
 655         u16 channel = ch->hw_value;
 656
 657         if ((le16_to_cpu(ctx->staging.channel) == channel) &&
 658             (priv->band == band))
 659                 return 0;
 660
 661         ctx->staging.channel = cpu_to_le16(channel);
 662         if (band == IEEE80211_BAND_5GHZ)
 663                 ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
 664         else
 665                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 666
 667         priv->band = band;
 668
 669         IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
 670
 671         return 0;
 672 }
 673
 674 void iwl_set_flags_for_band(struct iwl_priv *priv,
 675                             struct iwl_rxon_context *ctx,
 676                             enum ieee80211_band band,
 677                             struct ieee80211_vif *vif)
 678 {
 679         if (band == IEEE80211_BAND_5GHZ) {
 680                 ctx->staging.flags &=
 681                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
 682                       | RXON_FLG_CCK_MSK);
 683                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 684         } else {
 685                 /* Copied from iwl_post_associate() */
 686                 if (vif && vif->bss_conf.use_short_slot)
 687                         ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 688                 else
 689                         ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 690
 691                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 692                 ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
 693                 ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
 694         }
 695 }
 696
 697 /*
 698  * initialize rxon structure with default values from eeprom
 699  */
 700 void iwl_connection_init_rx_config(struct iwl_priv *priv,
 701                                    struct iwl_rxon_context *ctx)
 702 {
 703         const struct iwl_channel_info *ch_info;
 704
 705         memset(&ctx->staging, 0, sizeof(ctx->staging));
 706
 707         if (!ctx->vif) {
 708                 ctx->staging.dev_type = ctx->unused_devtype;
 709         } else switch (ctx->vif->type) {
 710         case NL80211_IFTYPE_AP:
 711                 ctx->staging.dev_type = ctx->ap_devtype;
 712                 break;
 713
 714         case NL80211_IFTYPE_STATION:
 715                 ctx->staging.dev_type = ctx->station_devtype;
 716                 ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
 717                 break;
 718
 719         case NL80211_IFTYPE_ADHOC:
 720                 ctx->staging.dev_type = ctx->ibss_devtype;
 721                 ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
 722                 ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
 723                                                   RXON_FILTER_ACCEPT_GRP_MSK;
 724                 break;
 725
 726         default:
 727                 IWL_ERR(priv, "Unsupported interface type %d\n",
 728                         ctx->vif->type);
 729                 break;
 730         }
 731
 732 #if 0
 733         /* TODO:  Figure out when short_preamble would be set and cache from
 734          * that */
 735         if (!hw_to_local(priv->hw)->short_preamble)
 736                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 737         else
 738                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 739 #endif
 740
 741         ch_info = iwl_get_channel_info(priv, priv->band,
 742                                        le16_to_cpu(ctx->active.channel));
 743
 744         if (!ch_info)
 745                 ch_info = &priv->channel_info[0];
 746
 747         ctx->staging.channel = cpu_to_le16(ch_info->channel);
 748         priv->band = ch_info->band;
 749
 750         iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
 751
 752         ctx->staging.ofdm_basic_rates =
 753             (IWL_OFDM_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 754         ctx->staging.cck_basic_rates =
 755             (IWL_CCK_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 756
 757         /* clear both MIX and PURE40 mode flag */
 758         ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
 759                                         RXON_FLG_CHANNEL_MODE_PURE_40);
 760         if (ctx->vif)
 761                 memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
 762
 763         ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
 764         ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
 765         ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
 766 }
 767
 768 void iwl_set_rate(struct iwl_priv *priv)
 769 {
 770         const struct ieee80211_supported_band *hw = NULL;
 771         struct ieee80211_rate *rate;
 772         struct iwl_rxon_context *ctx;
 773         int i;
 774
 775         hw = iwl_get_hw_mode(priv, priv->band);
 776         if (!hw) {
 777                 IWL_ERR(priv, "Failed to set rate: unable to get hw mode\n");
 778                 return;
 779         }
 780
 781         priv->active_rate = 0;
 782
 783         for (i = 0; i < hw->n_bitrates; i++) {
 784                 rate = &(hw->bitrates[i]);
 785                 if (rate->hw_value < IWL_RATE_COUNT_LEGACY)
 786                         priv->active_rate |= (1 << rate->hw_value);
 787         }
 788
 789         IWL_DEBUG_RATE(priv, "Set active_rate = %0x\n", priv->active_rate);
 790
 791         for_each_context(priv, ctx) {
 792                 ctx->staging.cck_basic_rates =
 793                     (IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 794
 795                 ctx->staging.ofdm_basic_rates =
 796                    (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 797         }
 798 }
 799
 800 void iwl_chswitch_done(struct iwl_priv *priv, bool is_success)
 801 {
 802         /*
 803          * MULTI-FIXME
 804          * See iwl_mac_channel_switch.
 805          */
 806         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 807
 808         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 809                 return;
 810
 811         if (test_and_clear_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
 812                 ieee80211_chswitch_done(ctx->vif, is_success);
 813 }
 814
 815 #ifdef CONFIG_IWLWIFI_DEBUG
 816 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
 817                              struct iwl_rxon_context *ctx)
 818 {
 819         struct iwl_rxon_cmd *rxon = &ctx->staging;
 820
 821         IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
 822         iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
 823         IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
 824         IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
 825         IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
 826                         le32_to_cpu(rxon->filter_flags));
 827         IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
 828         IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
 829                         rxon->ofdm_basic_rates);
 830         IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
 831         IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
 832         IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
 833         IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
 834 }
 835 #endif
 836
 837 static void iwlagn_abort_notification_waits(struct iwl_priv *priv)
 838 {
 839         unsigned long flags;
 840         struct iwl_notification_wait *wait_entry;
 841
 842         spin_lock_irqsave(&priv->_agn.notif_wait_lock, flags);
 843         list_for_each_entry(wait_entry, &priv->_agn.notif_waits, list)
 844                 wait_entry->aborted = true;
 845         spin_unlock_irqrestore(&priv->_agn.notif_wait_lock, flags);
 846
 847         wake_up_all(&priv->_agn.notif_waitq);
 848 }
 849
 850 void iwlagn_fw_error(struct iwl_priv *priv, bool ondemand)
 851 {
 852         unsigned int reload_msec;
 853         unsigned long reload_jiffies;
 854
 855         /* Set the FW error flag -- cleared on iwl_down */
 856         set_bit(STATUS_FW_ERROR, &priv->status);
 857
 858         /* Cancel currently queued command. */
 859         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 860
 861         iwlagn_abort_notification_waits(priv);
 862
 863         /* Keep the restart process from trying to send host
 864          * commands by clearing the ready bit */
 865         clear_bit(STATUS_READY, &priv->status);
 866
 867         wake_up_interruptible(&priv->wait_command_queue);
 868
 869         if (!ondemand) {
 870                 /*
 871                  * If firmware keep reloading, then it indicate something
 872                  * serious wrong and firmware having problem to recover
 873                  * from it. Instead of keep trying which will fill the syslog
 874                  * and hang the system, let's just stop it
 875                  */
 876                 reload_jiffies = jiffies;
 877                 reload_msec = jiffies_to_msecs((long) reload_jiffies -
 878                                         (long) priv->reload_jiffies);
 879                 priv->reload_jiffies = reload_jiffies;
 880                 if (reload_msec <= IWL_MIN_RELOAD_DURATION) {
 881                         priv->reload_count++;
 882                         if (priv->reload_count >= IWL_MAX_CONTINUE_RELOAD_CNT) {
 883                                 IWL_ERR(priv, "BUG_ON, Stop restarting\n");
 884                                 return;
 885                         }
 886                 } else
 887                         priv->reload_count = 0;
 888         }
 889
 890         if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 891                 if (iwlagn_mod_params.restart_fw) {
 892                         IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
 893                                   "Restarting adapter due to uCode error.\n");
 894                         queue_work(priv->workqueue, &priv->restart);
 895                 } else
 896                         IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
 897                                   "Detected FW error, but not restarting\n");
 898         }
 899 }
 900
 901 /**
 902  * iwl_irq_handle_error - called for HW or SW error interrupt from card
 903  */
 904 void iwl_irq_handle_error(struct iwl_priv *priv)
 905 {
 906         /* W/A for WiFi/WiMAX coex and WiMAX own the RF */
 907         if (priv->cfg->internal_wimax_coex &&
 908             (!(iwl_read_prph(priv, APMG_CLK_CTRL_REG) &
 909                         APMS_CLK_VAL_MRB_FUNC_MODE) ||
 910              (iwl_read_prph(priv, APMG_PS_CTRL_REG) &
 911                         APMG_PS_CTRL_VAL_RESET_REQ))) {
 912                 /*
 913                  * Keep the restart process from trying to send host
 914                  * commands by clearing the ready bit.
 915                  */
 916                 clear_bit(STATUS_READY, &priv->status);
 917                 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 918                 wake_up_interruptible(&priv->wait_command_queue);
 919                 IWL_ERR(priv, "RF is used by WiMAX\n");
 920                 return;
 921         }
 922
 923         IWL_ERR(priv, "Loaded firmware version: %s\n",
 924                 priv->hw->wiphy->fw_version);
 925
 926         iwl_dump_nic_error_log(priv);
 927         iwl_dump_csr(priv);
 928         iwl_dump_fh(priv, NULL, false);
 929         iwl_dump_nic_event_log(priv, false, NULL, false);
 930 #ifdef CONFIG_IWLWIFI_DEBUG
 931         if (iwl_get_debug_level(priv) & IWL_DL_FW_ERRORS)
 932                 iwl_print_rx_config_cmd(priv,
 933                                         &priv->contexts[IWL_RXON_CTX_BSS]);
 934 #endif
 935
 936         iwlagn_fw_error(priv, false);
 937 }
 938
 939 static int iwl_apm_stop_master(struct iwl_priv *priv)
 940 {
 941         int ret = 0;
 942
 943         /* stop device's busmaster DMA activity */
 944         iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
 945
 946         ret = iwl_poll_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
 947                         CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
 948         if (ret)
 949                 IWL_WARN(priv, "Master Disable Timed Out, 100 usec\n");
 950
 951         IWL_DEBUG_INFO(priv, "stop master\n");
 952
 953         return ret;
 954 }
 955
 956 void iwl_apm_stop(struct iwl_priv *priv)
 957 {
 958         IWL_DEBUG_INFO(priv, "Stop card, put in low power state\n");
 959
 960         clear_bit(STATUS_DEVICE_ENABLED, &priv->status);
 961
 962         /* Stop device's DMA activity */
 963         iwl_apm_stop_master(priv);
 964
 965         /* Reset the entire device */
 966         iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
 967
 968         udelay(10);
 969
 970         /*
 971          * Clear "initialization complete" bit to move adapter from
 972          * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
 973          */
 974         iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 975 }
 976
 977
 978 /*
 979  * Start up NIC's basic functionality after it has been reset
 980  * (e.g. after platform boot, or shutdown via iwl_apm_stop())
 981  * NOTE:  This does not load uCode nor start the embedded processor
 982  */
 983 int iwl_apm_init(struct iwl_priv *priv)
 984 {
 985         int ret = 0;
 986         IWL_DEBUG_INFO(priv, "Init card's basic functions\n");
 987
 988         /*
 989          * Use "set_bit" below rather than "write", to preserve any hardware
 990          * bits already set by default after reset.
 991          */
 992
 993         /* Disable L0S exit timer (platform NMI Work/Around) */
 994         iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
 995                           CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
 996
 997         /*
 998          * Disable L0s without affecting L1;
 999          *  don't wait for ICH L0s (ICH bug W/A)
1000          */
1001         iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
1002                           CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
1003
1004         /* Set FH wait threshold to maximum (HW error during stress W/A) */
1005         iwl_set_bit(priv, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
1006
1007         /*
1008          * Enable HAP INTA (interrupt from management bus) to
1009          * wake device's PCI Express link L1a -> L0s
1010          */
1011         iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
1012                                     CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
1013
1014         priv->bus.ops->apm_config(&priv->bus);
1015
1016         /* Configure analog phase-lock-loop before activating to D0A */
1017         if (priv->cfg->base_params->pll_cfg_val)
1018                 iwl_set_bit(priv, CSR_ANA_PLL_CFG,
1019                             priv->cfg->base_params->pll_cfg_val);
1020
1021         /*
1022          * Set "initialization complete" bit to move adapter from
1023          * D0U* --> D0A* (powered-up active) state.
1024          */
1025         iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
1026
1027         /*
1028          * Wait for clock stabilization; once stabilized, access to
1029          * device-internal resources is supported, e.g. iwl_write_prph()
1030          * and accesses to uCode SRAM.
1031          */
1032         ret = iwl_poll_bit(priv, CSR_GP_CNTRL,
1033                         CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
1034                         CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
1035         if (ret < 0) {
1036                 IWL_DEBUG_INFO(priv, "Failed to init the card\n");
1037                 goto out;
1038         }
1039
1040         /*
1041          * Enable DMA clock and wait for it to stabilize.
1042          *
1043          * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
1044          * do not disable clocks.  This preserves any hardware bits already
1045          * set by default in "CLK_CTRL_REG" after reset.
1046          */
1047         iwl_write_prph(priv, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
1048         udelay(20);
1049
1050         /* Disable L1-Active */
1051         iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
1052                           APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
1053
1054         set_bit(STATUS_DEVICE_ENABLED, &priv->status);
1055
1056 out:
1057         return ret;
1058 }
1059
1060
1061 int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
1062 {
1063         int ret;
1064         s8 prev_tx_power;
1065         bool defer;
1066         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
1067
1068         lockdep_assert_held(&priv->mutex);
1069
1070         if (priv->tx_power_user_lmt == tx_power && !force)
1071                 return 0;
1072
1073         if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
1074                 IWL_WARN(priv,
1075                          "Requested user TXPOWER %d below lower limit %d.\n",
1076                          tx_power,
1077                          IWLAGN_TX_POWER_TARGET_POWER_MIN);
1078                 return -EINVAL;
1079         }
1080
1081         if (tx_power > priv->tx_power_device_lmt) {
1082                 IWL_WARN(priv,
1083                         "Requested user TXPOWER %d above upper limit %d.\n",
1084                          tx_power, priv->tx_power_device_lmt);
1085                 return -EINVAL;
1086         }
1087
1088         if (!iwl_is_ready_rf(priv))
1089                 return -EIO;
1090
1091         /* scan complete and commit_rxon use tx_power_next value,
1092          * it always need to be updated for newest request */
1093         priv->tx_power_next = tx_power;
1094
1095         /* do not set tx power when scanning or channel changing */
1096         defer = test_bit(STATUS_SCANNING, &priv->status) ||
1097                 memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
1098         if (defer && !force) {
1099                 IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
1100                 return 0;
1101         }
1102
1103         prev_tx_power = priv->tx_power_user_lmt;
1104         priv->tx_power_user_lmt = tx_power;
1105
1106         ret = iwlagn_send_tx_power(priv);
1107
1108         /* if fail to set tx_power, restore the orig. tx power */
1109         if (ret) {
1110                 priv->tx_power_user_lmt = prev_tx_power;
1111                 priv->tx_power_next = prev_tx_power;
1112         }
1113         return ret;
1114 }
1115
1116 void iwl_send_bt_config(struct iwl_priv *priv)
1117 {
1118         struct iwl_bt_cmd bt_cmd = {
1119                 .lead_time = BT_LEAD_TIME_DEF,
1120                 .max_kill = BT_MAX_KILL_DEF,
1121                 .kill_ack_mask = 0,
1122                 .kill_cts_mask = 0,
1123         };
1124
1125         if (!iwlagn_mod_params.bt_coex_active)
1126                 bt_cmd.flags = BT_COEX_DISABLE;
1127         else
1128                 bt_cmd.flags = BT_COEX_ENABLE;
1129
1130         priv->bt_enable_flag = bt_cmd.flags;
1131         IWL_DEBUG_INFO(priv, "BT coex %s\n",
1132                 (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
1133
1134         if (iwl_send_cmd_pdu(priv, REPLY_BT_CONFIG,
1135                              sizeof(struct iwl_bt_cmd), &bt_cmd))
1136                 IWL_ERR(priv, "failed to send BT Coex Config\n");
1137 }
1138
1139 int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags, bool clear)
1140 {
1141         struct iwl_statistics_cmd statistics_cmd = {
1142                 .configuration_flags =
1143                         clear ? IWL_STATS_CONF_CLEAR_STATS : 0,
1144         };
1145
1146         if (flags & CMD_ASYNC)
1147                 return iwl_send_cmd_pdu_async(priv, REPLY_STATISTICS_CMD,
1148                                                sizeof(struct iwl_statistics_cmd),
1149                                                &statistics_cmd, NULL);
1150         else
1151                 return iwl_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
1152                                         sizeof(struct iwl_statistics_cmd),
1153                                         &statistics_cmd);
1154 }
1155
1156 void iwl_clear_isr_stats(struct iwl_priv *priv)
1157 {
1158         memset(&priv->isr_stats, 0, sizeof(priv->isr_stats));
1159 }
1160
1161 int iwl_mac_conf_tx(struct ieee80211_hw *hw, u16 queue,
1162                            const struct ieee80211_tx_queue_params *params)
1163 {
1164         struct iwl_priv *priv = hw->priv;
1165         struct iwl_rxon_context *ctx;
1166         unsigned long flags;
1167         int q;
1168
1169         IWL_DEBUG_MAC80211(priv, "enter\n");
1170
1171         if (!iwl_is_ready_rf(priv)) {
1172                 IWL_DEBUG_MAC80211(priv, "leave - RF not ready\n");
1173                 return -EIO;
1174         }
1175
1176         if (queue >= AC_NUM) {
1177                 IWL_DEBUG_MAC80211(priv, "leave - queue >= AC_NUM %d\n", queue);
1178                 return 0;
1179         }
1180
1181         q = AC_NUM - 1 - queue;
1182
1183         spin_lock_irqsave(&priv->lock, flags);
1184
1185         /*
1186          * MULTI-FIXME
1187          * This may need to be done per interface in nl80211/cfg80211/mac80211.
1188          */
1189         for_each_context(priv, ctx) {
1190                 ctx->qos_data.def_qos_parm.ac[q].cw_min =
1191                         cpu_to_le16(params->cw_min);
1192                 ctx->qos_data.def_qos_parm.ac[q].cw_max =
1193                         cpu_to_le16(params->cw_max);
1194                 ctx->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
1195                 ctx->qos_data.def_qos_parm.ac[q].edca_txop =
1196                                 cpu_to_le16((params->txop * 32));
1197
1198                 ctx->qos_data.def_qos_parm.ac[q].reserved1 = 0;
1199         }
1200
1201         spin_unlock_irqrestore(&priv->lock, flags);
1202
1203         IWL_DEBUG_MAC80211(priv, "leave\n");
1204         return 0;
1205 }
1206
1207 int iwl_mac_tx_last_beacon(struct ieee80211_hw *hw)
1208 {
1209         struct iwl_priv *priv = hw->priv;
1210
1211         return priv->ibss_manager == IWL_IBSS_MANAGER;
1212 }
1213
1214 static int iwl_set_mode(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
1215 {
1216         iwl_connection_init_rx_config(priv, ctx);
1217
1218         iwlagn_set_rxon_chain(priv, ctx);
1219
1220         return iwlagn_commit_rxon(priv, ctx);
1221 }
1222
1223 static int iwl_setup_interface(struct iwl_priv *priv,
1224                                struct iwl_rxon_context *ctx)
1225 {
1226         struct ieee80211_vif *vif = ctx->vif;
1227         int err;
1228
1229         lockdep_assert_held(&priv->mutex);
1230
1231         /*
1232          * This variable will be correct only when there's just
1233          * a single context, but all code using it is for hardware
1234          * that supports only one context.
1235          */
1236         priv->iw_mode = vif->type;
1237
1238         ctx->is_active = true;
1239
1240         err = iwl_set_mode(priv, ctx);
1241         if (err) {
1242                 if (!ctx->always_active)
1243                         ctx->is_active = false;
1244                 return err;
1245         }
1246
1247         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist &&
1248             vif->type == NL80211_IFTYPE_ADHOC) {
1249                 /*
1250                  * pretend to have high BT traffic as long as we
1251                  * are operating in IBSS mode, as this will cause
1252                  * the rate scaling etc. to behave as intended.
1253                  */
1254                 priv->bt_traffic_load = IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
1255         }
1256
1257         return 0;
1258 }
1259
1260 int iwl_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
1261 {
1262         struct iwl_priv *priv = hw->priv;
1263         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1264         struct iwl_rxon_context *tmp, *ctx = NULL;
1265         int err;
1266         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(vif);
1267
1268         IWL_DEBUG_MAC80211(priv, "enter: type %d, addr %pM\n",
1269                            viftype, vif->addr);
1270
1271         mutex_lock(&priv->mutex);
1272
1273         if (!iwl_is_ready_rf(priv)) {
1274                 IWL_WARN(priv, "Try to add interface when device not ready\n");
1275                 err = -EINVAL;
1276                 goto out;
1277         }
1278
1279         for_each_context(priv, tmp) {
1280                 u32 possible_modes =
1281                         tmp->interface_modes | tmp->exclusive_interface_modes;
1282
1283                 if (tmp->vif) {
1284                         /* check if this busy context is exclusive */
1285                         if (tmp->exclusive_interface_modes &
1286                                                 BIT(tmp->vif->type)) {
1287                                 err = -EINVAL;
1288                                 goto out;
1289                         }
1290                         continue;
1291                 }
1292
1293                 if (!(possible_modes & BIT(viftype)))
1294                         continue;
1295
1296                 /* have maybe usable context w/o interface */
1297                 ctx = tmp;
1298                 break;
1299         }
1300
1301         if (!ctx) {
1302                 err = -EOPNOTSUPP;
1303                 goto out;
1304         }
1305
1306         vif_priv->ctx = ctx;
1307         ctx->vif = vif;
1308
1309         err = iwl_setup_interface(priv, ctx);
1310         if (!err)
1311                 goto out;
1312
1313         ctx->vif = NULL;
1314         priv->iw_mode = NL80211_IFTYPE_STATION;
1315  out:
1316         mutex_unlock(&priv->mutex);
1317
1318         IWL_DEBUG_MAC80211(priv, "leave\n");
1319         return err;
1320 }
1321
1322 static void iwl_teardown_interface(struct iwl_priv *priv,
1323                                    struct ieee80211_vif *vif,
1324                                    bool mode_change)
1325 {
1326         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1327
1328         lockdep_assert_held(&priv->mutex);
1329
1330         if (priv->scan_vif == vif) {
1331                 iwl_scan_cancel_timeout(priv, 200);
1332                 iwl_force_scan_end(priv);
1333         }
1334
1335         if (!mode_change) {
1336                 iwl_set_mode(priv, ctx);
1337                 if (!ctx->always_active)
1338                         ctx->is_active = false;
1339         }
1340
1341         /*
1342          * When removing the IBSS interface, overwrite the
1343          * BT traffic load with the stored one from the last
1344          * notification, if any. If this is a device that
1345          * doesn't implement this, this has no effect since
1346          * both values are the same and zero.
1347          */
1348         if (vif->type == NL80211_IFTYPE_ADHOC)
1349                 priv->bt_traffic_load = priv->last_bt_traffic_load;
1350 }
1351
1352 void iwl_mac_remove_interface(struct ieee80211_hw *hw,
1353                               struct ieee80211_vif *vif)
1354 {
1355         struct iwl_priv *priv = hw->priv;
1356         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1357
1358         IWL_DEBUG_MAC80211(priv, "enter\n");
1359
1360         mutex_lock(&priv->mutex);
1361
1362         WARN_ON(ctx->vif != vif);
1363         ctx->vif = NULL;
1364
1365         iwl_teardown_interface(priv, vif, false);
1366
1367         mutex_unlock(&priv->mutex);
1368
1369         IWL_DEBUG_MAC80211(priv, "leave\n");
1370
1371 }
1372
1373 void iwl_free_txq_mem(struct iwl_priv *priv)
1374 {
1375         kfree(priv->txq);
1376         priv->txq = NULL;
1377 }
1378
1379 #ifdef CONFIG_IWLWIFI_DEBUGFS
1380
1381 #define IWL_TRAFFIC_DUMP_SIZE   (IWL_TRAFFIC_ENTRY_SIZE * IWL_TRAFFIC_ENTRIES)
1382
1383 void iwl_reset_traffic_log(struct iwl_priv *priv)
1384 {
1385         priv->tx_traffic_idx = 0;
1386         priv->rx_traffic_idx = 0;
1387         if (priv->tx_traffic)
1388                 memset(priv->tx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
1389         if (priv->rx_traffic)
1390                 memset(priv->rx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
1391 }
1392
1393 int iwl_alloc_traffic_mem(struct iwl_priv *priv)
1394 {
1395         u32 traffic_size = IWL_TRAFFIC_DUMP_SIZE;
1396
1397         if (iwl_debug_level & IWL_DL_TX) {
1398                 if (!priv->tx_traffic) {
1399                         priv->tx_traffic =
1400                                 kzalloc(traffic_size, GFP_KERNEL);
1401                         if (!priv->tx_traffic)
1402                                 return -ENOMEM;
1403                 }
1404         }
1405         if (iwl_debug_level & IWL_DL_RX) {
1406                 if (!priv->rx_traffic) {
1407                         priv->rx_traffic =
1408                                 kzalloc(traffic_size, GFP_KERNEL);
1409                         if (!priv->rx_traffic)
1410                                 return -ENOMEM;
1411                 }
1412         }
1413         iwl_reset_traffic_log(priv);
1414         return 0;
1415 }
1416
1417 void iwl_free_traffic_mem(struct iwl_priv *priv)
1418 {
1419         kfree(priv->tx_traffic);
1420         priv->tx_traffic = NULL;
1421
1422         kfree(priv->rx_traffic);
1423         priv->rx_traffic = NULL;
1424 }
1425
1426 void iwl_dbg_log_tx_data_frame(struct iwl_priv *priv,
1427                       u16 length, struct ieee80211_hdr *header)
1428 {
1429         __le16 fc;
1430         u16 len;
1431
1432         if (likely(!(iwl_debug_level & IWL_DL_TX)))
1433                 return;
1434
1435         if (!priv->tx_traffic)
1436                 return;
1437
1438         fc = header->frame_control;
1439         if (ieee80211_is_data(fc)) {
1440                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
1441                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
1442                 memcpy((priv->tx_traffic +
1443                        (priv->tx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
1444                        header, len);
1445                 priv->tx_traffic_idx =
1446                         (priv->tx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
1447         }
1448 }
1449
1450 void iwl_dbg_log_rx_data_frame(struct iwl_priv *priv,
1451                       u16 length, struct ieee80211_hdr *header)
1452 {
1453         __le16 fc;
1454         u16 len;
1455
1456         if (likely(!(iwl_debug_level & IWL_DL_RX)))
1457                 return;
1458
1459         if (!priv->rx_traffic)
1460                 return;
1461
1462         fc = header->frame_control;
1463         if (ieee80211_is_data(fc)) {
1464                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
1465                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
1466                 memcpy((priv->rx_traffic +
1467                        (priv->rx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
1468                        header, len);
1469                 priv->rx_traffic_idx =
1470                         (priv->rx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
1471         }
1472 }
1473
1474 const char *get_mgmt_string(int cmd)
1475 {
1476         switch (cmd) {
1477                 IWL_CMD(MANAGEMENT_ASSOC_REQ);
1478                 IWL_CMD(MANAGEMENT_ASSOC_RESP);
1479                 IWL_CMD(MANAGEMENT_REASSOC_REQ);
1480                 IWL_CMD(MANAGEMENT_REASSOC_RESP);
1481                 IWL_CMD(MANAGEMENT_PROBE_REQ);
1482                 IWL_CMD(MANAGEMENT_PROBE_RESP);
1483                 IWL_CMD(MANAGEMENT_BEACON);
1484                 IWL_CMD(MANAGEMENT_ATIM);
1485                 IWL_CMD(MANAGEMENT_DISASSOC);
1486                 IWL_CMD(MANAGEMENT_AUTH);
1487                 IWL_CMD(MANAGEMENT_DEAUTH);
1488                 IWL_CMD(MANAGEMENT_ACTION);
1489         default:
1490                 return "UNKNOWN";
1491
1492         }
1493 }
1494
1495 const char *get_ctrl_string(int cmd)
1496 {
1497         switch (cmd) {
1498                 IWL_CMD(CONTROL_BACK_REQ);
1499                 IWL_CMD(CONTROL_BACK);
1500                 IWL_CMD(CONTROL_PSPOLL);
1501                 IWL_CMD(CONTROL_RTS);
1502                 IWL_CMD(CONTROL_CTS);
1503                 IWL_CMD(CONTROL_ACK);
1504                 IWL_CMD(CONTROL_CFEND);
1505                 IWL_CMD(CONTROL_CFENDACK);
1506         default:
1507                 return "UNKNOWN";
1508
1509         }
1510 }
1511
1512 void iwl_clear_traffic_stats(struct iwl_priv *priv)
1513 {
1514         memset(&priv->tx_stats, 0, sizeof(struct traffic_stats));
1515         memset(&priv->rx_stats, 0, sizeof(struct traffic_stats));
1516 }
1517
1518 /*
1519  * if CONFIG_IWLWIFI_DEBUGFS defined, iwl_update_stats function will
1520  * record all the MGMT, CTRL and DATA pkt for both TX and Rx pass.
1521  * Use debugFs to display the rx/rx_statistics
1522  * if CONFIG_IWLWIFI_DEBUGFS not being defined, then no MGMT and CTRL
1523  * information will be recorded, but DATA pkt still will be recorded
1524  * for the reason of iwl_led.c need to control the led blinking based on
1525  * number of tx and rx data.
1526  *
1527  */
1528 void iwl_update_stats(struct iwl_priv *priv, bool is_tx, __le16 fc, u16 len)
1529 {
1530         struct traffic_stats    *stats;
1531
1532         if (is_tx)
1533                 stats = &priv->tx_stats;
1534         else
1535                 stats = &priv->rx_stats;
1536
1537         if (ieee80211_is_mgmt(fc)) {
1538                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
1539                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
1540                         stats->mgmt[MANAGEMENT_ASSOC_REQ]++;
1541                         break;
1542                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
1543                         stats->mgmt[MANAGEMENT_ASSOC_RESP]++;
1544                         break;
1545                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
1546                         stats->mgmt[MANAGEMENT_REASSOC_REQ]++;
1547                         break;
1548                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
1549                         stats->mgmt[MANAGEMENT_REASSOC_RESP]++;
1550                         break;
1551                 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
1552                         stats->mgmt[MANAGEMENT_PROBE_REQ]++;
1553                         break;
1554                 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
1555                         stats->mgmt[MANAGEMENT_PROBE_RESP]++;
1556                         break;
1557                 case cpu_to_le16(IEEE80211_STYPE_BEACON):
1558                         stats->mgmt[MANAGEMENT_BEACON]++;
1559                         break;
1560                 case cpu_to_le16(IEEE80211_STYPE_ATIM):
1561                         stats->mgmt[MANAGEMENT_ATIM]++;
1562                         break;
1563                 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
1564                         stats->mgmt[MANAGEMENT_DISASSOC]++;
1565                         break;
1566                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
1567                         stats->mgmt[MANAGEMENT_AUTH]++;
1568                         break;
1569                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
1570                         stats->mgmt[MANAGEMENT_DEAUTH]++;
1571                         break;
1572                 case cpu_to_le16(IEEE80211_STYPE_ACTION):
1573                         stats->mgmt[MANAGEMENT_ACTION]++;
1574                         break;
1575                 }
1576         } else if (ieee80211_is_ctl(fc)) {
1577                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
1578                 case cpu_to_le16(IEEE80211_STYPE_BACK_REQ):
1579                         stats->ctrl[CONTROL_BACK_REQ]++;
1580                         break;
1581                 case cpu_to_le16(IEEE80211_STYPE_BACK):
1582                         stats->ctrl[CONTROL_BACK]++;
1583                         break;
1584                 case cpu_to_le16(IEEE80211_STYPE_PSPOLL):
1585                         stats->ctrl[CONTROL_PSPOLL]++;
1586                         break;
1587                 case cpu_to_le16(IEEE80211_STYPE_RTS):
1588                         stats->ctrl[CONTROL_RTS]++;
1589                         break;
1590                 case cpu_to_le16(IEEE80211_STYPE_CTS):
1591                         stats->ctrl[CONTROL_CTS]++;
1592                         break;
1593                 case cpu_to_le16(IEEE80211_STYPE_ACK):
1594                         stats->ctrl[CONTROL_ACK]++;
1595                         break;
1596                 case cpu_to_le16(IEEE80211_STYPE_CFEND):
1597                         stats->ctrl[CONTROL_CFEND]++;
1598                         break;
1599                 case cpu_to_le16(IEEE80211_STYPE_CFENDACK):
1600                         stats->ctrl[CONTROL_CFENDACK]++;
1601                         break;
1602                 }
1603         } else {
1604                 /* data */
1605                 stats->data_cnt++;
1606                 stats->data_bytes += len;
1607         }
1608 }
1609 #endif
1610
1611 static void iwl_force_rf_reset(struct iwl_priv *priv)
1612 {
1613         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1614                 return;
1615
1616         if (!iwl_is_any_associated(priv)) {
1617                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
1618                 return;
1619         }
1620         /*
1621          * There is no easy and better way to force reset the radio,
1622          * the only known method is switching channel which will force to
1623          * reset and tune the radio.
1624          * Use internal short scan (single channel) operation to should
1625          * achieve this objective.
1626          * Driver should reset the radio when number of consecutive missed
1627          * beacon, or any other uCode error condition detected.
1628          */
1629         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
1630         iwl_internal_short_hw_scan(priv);
1631 }
1632
1633
1634 int iwl_force_reset(struct iwl_priv *priv, int mode, bool external)
1635 {
1636         struct iwl_force_reset *force_reset;
1637
1638         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1639                 return -EINVAL;
1640
1641         if (mode >= IWL_MAX_FORCE_RESET) {
1642                 IWL_DEBUG_INFO(priv, "invalid reset request.\n");
1643                 return -EINVAL;
1644         }
1645         force_reset = &priv->force_reset[mode];
1646         force_reset->reset_request_count++;
1647         if (!external) {
1648                 if (force_reset->last_force_reset_jiffies &&
1649                     time_after(force_reset->last_force_reset_jiffies +
1650                     force_reset->reset_duration, jiffies)) {
1651                         IWL_DEBUG_INFO(priv, "force reset rejected\n");
1652                         force_reset->reset_reject_count++;
1653                         return -EAGAIN;
1654                 }
1655         }
1656         force_reset->reset_success_count++;
1657         force_reset->last_force_reset_jiffies = jiffies;
1658         IWL_DEBUG_INFO(priv, "perform force reset (%d)\n", mode);
1659         switch (mode) {
1660         case IWL_RF_RESET:
1661                 iwl_force_rf_reset(priv);
1662                 break;
1663         case IWL_FW_RESET:
1664                 /*
1665                  * if the request is from external(ex: debugfs),
1666                  * then always perform the request in regardless the module
1667                  * parameter setting
1668                  * if the request is from internal (uCode error or driver
1669                  * detect failure), then fw_restart module parameter
1670                  * need to be check before performing firmware reload
1671                  */
1672                 if (!external && !iwlagn_mod_params.restart_fw) {
1673                         IWL_DEBUG_INFO(priv, "Cancel firmware reload based on "
1674                                        "module parameter setting\n");
1675                         break;
1676                 }
1677                 IWL_ERR(priv, "On demand firmware reload\n");
1678                 iwlagn_fw_error(priv, true);
1679                 break;
1680         }
1681         return 0;
1682 }
1683
1684 int iwl_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1685                              enum nl80211_iftype newtype, bool newp2p)
1686 {
1687         struct iwl_priv *priv = hw->priv;
1688         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1689         struct iwl_rxon_context *bss_ctx = &priv->contexts[IWL_RXON_CTX_BSS];
1690         struct iwl_rxon_context *tmp;
1691         enum nl80211_iftype newviftype = newtype;
1692         u32 interface_modes;
1693         int err;
1694
1695         newtype = ieee80211_iftype_p2p(newtype, newp2p);
1696
1697         mutex_lock(&priv->mutex);
1698
1699         if (!ctx->vif || !iwl_is_ready_rf(priv)) {
1700                 /*
1701                  * Huh? But wait ... this can maybe happen when
1702                  * we're in the middle of a firmware restart!
1703                  */
1704                 err = -EBUSY;
1705                 goto out;
1706         }
1707
1708         interface_modes = ctx->interface_modes | ctx->exclusive_interface_modes;
1709
1710         if (!(interface_modes & BIT(newtype))) {
1711                 err = -EBUSY;
1712                 goto out;
1713         }
1714
1715         /*
1716          * Refuse a change that should be done by moving from the PAN
1717          * context to the BSS context instead, if the BSS context is
1718          * available and can support the new interface type.
1719          */
1720         if (ctx->ctxid == IWL_RXON_CTX_PAN && !bss_ctx->vif &&
1721             (bss_ctx->interface_modes & BIT(newtype) ||
1722              bss_ctx->exclusive_interface_modes & BIT(newtype))) {
1723                 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
1724                 err = -EBUSY;
1725                 goto out;
1726         }
1727
1728         if (ctx->exclusive_interface_modes & BIT(newtype)) {
1729                 for_each_context(priv, tmp) {
1730                         if (ctx == tmp)
1731                                 continue;
1732
1733                         if (!tmp->vif)
1734                                 continue;
1735
1736                         /*
1737                          * The current mode switch would be exclusive, but
1738                          * another context is active ... refuse the switch.
1739                          */
1740                         err = -EBUSY;
1741                         goto out;
1742                 }
1743         }
1744
1745         /* success */
1746         iwl_teardown_interface(priv, vif, true);
1747         vif->type = newviftype;
1748         vif->p2p = newp2p;
1749         err = iwl_setup_interface(priv, ctx);
1750         WARN_ON(err);
1751         /*
1752          * We've switched internally, but submitting to the
1753          * device may have failed for some reason. Mask this
1754          * error, because otherwise mac80211 will not switch
1755          * (and set the interface type back) and we'll be
1756          * out of sync with it.
1757          */
1758         err = 0;
1759
1760  out:
1761         mutex_unlock(&priv->mutex);
1762         return err;
1763 }
1764
1765 /*
1766  * On every watchdog tick we check (latest) time stamp. If it does not
1767  * change during timeout period and queue is not empty we reset firmware.
1768  */
1769 static int iwl_check_stuck_queue(struct iwl_priv *priv, int cnt)
1770 {
1771         struct iwl_tx_queue *txq = &priv->txq[cnt];
1772         struct iwl_queue *q = &txq->q;
1773         unsigned long timeout;
1774         int ret;
1775
1776         if (q->read_ptr == q->write_ptr) {
1777                 txq->time_stamp = jiffies;
1778                 return 0;
1779         }
1780
1781         timeout = txq->time_stamp +
1782                   msecs_to_jiffies(priv->cfg->base_params->wd_timeout);
1783
1784         if (time_after(jiffies, timeout)) {
1785                 IWL_ERR(priv, "Queue %d stuck for %u ms.\n",
1786                                 q->id, priv->cfg->base_params->wd_timeout);
1787                 ret = iwl_force_reset(priv, IWL_FW_RESET, false);
1788                 return (ret == -EAGAIN) ? 0 : 1;
1789         }
1790
1791         return 0;
1792 }
1793
1794 /*
1795  * Making watchdog tick be a quarter of timeout assure we will
1796  * discover the queue hung between timeout and 1.25*timeout
1797  */
1798 #define IWL_WD_TICK(timeout) ((timeout) / 4)
1799
1800 /*
1801  * Watchdog timer callback, we check each tx queue for stuck, if if hung
1802  * we reset the firmware. If everything is fine just rearm the timer.
1803  */
1804 void iwl_bg_watchdog(unsigned long data)
1805 {
1806         struct iwl_priv *priv = (struct iwl_priv *)data;
1807         int cnt;
1808         unsigned long timeout;
1809
1810         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1811                 return;
1812
1813         timeout = priv->cfg->base_params->wd_timeout;
1814         if (timeout == 0)
1815                 return;
1816
1817         /* monitor and check for stuck cmd queue */
1818         if (iwl_check_stuck_queue(priv, priv->cmd_queue))
1819                 return;
1820
1821         /* monitor and check for other stuck queues */
1822         if (iwl_is_any_associated(priv)) {
1823                 for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
1824                         /* skip as we already checked the command queue */
1825                         if (cnt == priv->cmd_queue)
1826                                 continue;
1827                         if (iwl_check_stuck_queue(priv, cnt))
1828                                 return;
1829                 }
1830         }
1831
1832         mod_timer(&priv->watchdog, jiffies +
1833                   msecs_to_jiffies(IWL_WD_TICK(timeout)));
1834 }
1835
1836 void iwl_setup_watchdog(struct iwl_priv *priv)
1837 {
1838         unsigned int timeout = priv->cfg->base_params->wd_timeout;
1839
1840         if (timeout && !iwlagn_mod_params.wd_disable)
1841                 mod_timer(&priv->watchdog,
1842                           jiffies + msecs_to_jiffies(IWL_WD_TICK(timeout)));
1843         else
1844                 del_timer(&priv->watchdog);
1845 }
1846
1847 /*
1848  * extended beacon time format
1849  * time in usec will be changed into a 32-bit value in extended:internal format
1850  * the extended part is the beacon counts
1851  * the internal part is the time in usec within one beacon interval
1852  */
1853 u32 iwl_usecs_to_beacons(struct iwl_priv *priv, u32 usec, u32 beacon_interval)
1854 {
1855         u32 quot;
1856         u32 rem;
1857         u32 interval = beacon_interval * TIME_UNIT;
1858
1859         if (!interval || !usec)
1860                 return 0;
1861
1862         quot = (usec / interval) &
1863                 (iwl_beacon_time_mask_high(priv,
1864                 priv->hw_params.beacon_time_tsf_bits) >>
1865                 priv->hw_params.beacon_time_tsf_bits);
1866         rem = (usec % interval) & iwl_beacon_time_mask_low(priv,
1867                                    priv->hw_params.beacon_time_tsf_bits);
1868
1869         return (quot << priv->hw_params.beacon_time_tsf_bits) + rem;
1870 }
1871
1872 /* base is usually what we get from ucode with each received frame,
1873  * the same as HW timer counter counting down
1874  */
1875 __le32 iwl_add_beacon_time(struct iwl_priv *priv, u32 base,
1876                            u32 addon, u32 beacon_interval)
1877 {
1878         u32 base_low = base & iwl_beacon_time_mask_low(priv,
1879                                         priv->hw_params.beacon_time_tsf_bits);
1880         u32 addon_low = addon & iwl_beacon_time_mask_low(priv,
1881                                         priv->hw_params.beacon_time_tsf_bits);
1882         u32 interval = beacon_interval * TIME_UNIT;
1883         u32 res = (base & iwl_beacon_time_mask_high(priv,
1884                                 priv->hw_params.beacon_time_tsf_bits)) +
1885                                 (addon & iwl_beacon_time_mask_high(priv,
1886                                 priv->hw_params.beacon_time_tsf_bits));
1887
1888         if (base_low > addon_low)
1889                 res += base_low - addon_low;
1890         else if (base_low < addon_low) {
1891                 res += interval + base_low - addon_low;
1892                 res += (1 << priv->hw_params.beacon_time_tsf_bits);
1893         } else
1894                 res += (1 << priv->hw_params.beacon_time_tsf_bits);
1895
1896         return cpu_to_le32(res);
1897 }
1898
1899 #ifdef CONFIG_PM
1900
1901 int iwl_suspend(struct iwl_priv *priv)
1902 {
1903         /*
1904          * This function is called when system goes into suspend state
1905          * mac80211 will call iwl_mac_stop() from the mac80211 suspend function
1906          * first but since iwl_mac_stop() has no knowledge of who the caller is,
1907          * it will not call apm_ops.stop() to stop the DMA operation.
1908          * Calling apm_ops.stop here to make sure we stop the DMA.
1909          */
1910         iwl_apm_stop(priv);
1911
1912         return 0;
1913 }
1914
1915 int iwl_resume(struct iwl_priv *priv)
1916 {
1917         bool hw_rfkill = false;
1918
1919         iwl_enable_interrupts(priv);
1920
1921         if (!(iwl_read32(priv, CSR_GP_CNTRL) &
1922                                 CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
1923                 hw_rfkill = true;
1924
1925         if (hw_rfkill)
1926                 set_bit(STATUS_RF_KILL_HW, &priv->status);
1927         else
1928                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
1929
1930         wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rfkill);
1931
1932         return 0;
1933 }
1934
1935 #endif /* CONFIG_PM */