drivers/net/wireless/iwlwifi/iwl-legacy.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 <net/mac80211.h>
  31
  32 #include "iwl-dev.h"
  33 #include "iwl-core.h"
  34 #include "iwl-helpers.h"
  35 #include "iwl-legacy.h"
  36
  37 static void iwl_update_qos(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
  38 {
  39         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
  40                 return;
  41
  42         if (!ctx->is_active)
  43                 return;
  44
  45         ctx->qos_data.def_qos_parm.qos_flags = 0;
  46
  47         if (ctx->qos_data.qos_active)
  48                 ctx->qos_data.def_qos_parm.qos_flags |=
  49                         QOS_PARAM_FLG_UPDATE_EDCA_MSK;
  50
  51         if (ctx->ht.enabled)
  52                 ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
  53
  54         IWL_DEBUG_QOS(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
  55                       ctx->qos_data.qos_active,
  56                       ctx->qos_data.def_qos_parm.qos_flags);
  57
  58         iwl_send_cmd_pdu_async(priv, ctx->qos_cmd,
  59                                sizeof(struct iwl_qosparam_cmd),
  60                                &ctx->qos_data.def_qos_parm, NULL);
  61 }
  62
  63 /**
  64  * iwl_legacy_mac_config - mac80211 config callback
  65  */
  66 int iwl_legacy_mac_config(struct ieee80211_hw *hw, u32 changed)
  67 {
  68         struct iwl_priv *priv = hw->priv;
  69         const struct iwl_channel_info *ch_info;
  70         struct ieee80211_conf *conf = &hw->conf;
  71         struct ieee80211_channel *channel = conf->channel;
  72         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
  73         struct iwl_rxon_context *ctx;
  74         unsigned long flags = 0;
  75         int ret = 0;
  76         u16 ch;
  77         int scan_active = 0;
  78         bool ht_changed[NUM_IWL_RXON_CTX] = {};
  79
  80         if (WARN_ON(!priv->cfg->ops->legacy))
  81                 return -EOPNOTSUPP;
  82
  83         mutex_lock(&priv->mutex);
  84
  85         IWL_DEBUG_MAC80211(priv, "enter to channel %d changed 0x%X\n",
  86                                         channel->hw_value, changed);
  87
  88         if (unlikely(!priv->cfg->mod_params->disable_hw_scan &&
  89                         test_bit(STATUS_SCANNING, &priv->status))) {
  90                 scan_active = 1;
  91                 IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
  92         }
  93
  94         if (changed & (IEEE80211_CONF_CHANGE_SMPS |
  95                        IEEE80211_CONF_CHANGE_CHANNEL)) {
  96                 /* mac80211 uses static for non-HT which is what we want */
  97                 priv->current_ht_config.smps = conf->smps_mode;
  98
  99                 /*
 100                  * Recalculate chain counts.
 101                  *
 102                  * If monitor mode is enabled then mac80211 will
 103                  * set up the SM PS mode to OFF if an HT channel is
 104                  * configured.
 105                  */
 106                 if (priv->cfg->ops->hcmd->set_rxon_chain)
 107                         for_each_context(priv, ctx)
 108                                 priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
 109         }
 110
 111         /* during scanning mac80211 will delay channel setting until
 112          * scan finish with changed = 0
 113          */
 114         if (!changed || (changed & IEEE80211_CONF_CHANGE_CHANNEL)) {
 115                 if (scan_active)
 116                         goto set_ch_out;
 117
 118                 ch = channel->hw_value;
 119                 ch_info = iwl_get_channel_info(priv, channel->band, ch);
 120                 if (!is_channel_valid(ch_info)) {
 121                         IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
 122                         ret = -EINVAL;
 123                         goto set_ch_out;
 124                 }
 125
 126                 spin_lock_irqsave(&priv->lock, flags);
 127
 128                 for_each_context(priv, ctx) {
 129                         /* Configure HT40 channels */
 130                         if (ctx->ht.enabled != conf_is_ht(conf)) {
 131                                 ctx->ht.enabled = conf_is_ht(conf);
 132                                 ht_changed[ctx->ctxid] = true;
 133                         }
 134                         if (ctx->ht.enabled) {
 135                                 if (conf_is_ht40_minus(conf)) {
 136                                         ctx->ht.extension_chan_offset =
 137                                                 IEEE80211_HT_PARAM_CHA_SEC_BELOW;
 138                                         ctx->ht.is_40mhz = true;
 139                                 } else if (conf_is_ht40_plus(conf)) {
 140                                         ctx->ht.extension_chan_offset =
 141                                                 IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
 142                                         ctx->ht.is_40mhz = true;
 143                                 } else {
 144                                         ctx->ht.extension_chan_offset =
 145                                                 IEEE80211_HT_PARAM_CHA_SEC_NONE;
 146                                         ctx->ht.is_40mhz = false;
 147                                 }
 148                         } else
 149                                 ctx->ht.is_40mhz = false;
 150
 151                         /*
 152                          * Default to no protection. Protection mode will
 153                          * later be set from BSS config in iwl_ht_conf
 154                          */
 155                         ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 156
 157                         /* if we are switching from ht to 2.4 clear flags
 158                          * from any ht related info since 2.4 does not
 159                          * support ht */
 160                         if ((le16_to_cpu(ctx->staging.channel) != ch))
 161                                 ctx->staging.flags = 0;
 162
 163                         iwl_set_rxon_channel(priv, channel, ctx);
 164                         iwl_set_rxon_ht(priv, ht_conf);
 165
 166                         iwl_set_flags_for_band(priv, ctx, channel->band,
 167                                                ctx->vif);
 168                 }
 169
 170                 spin_unlock_irqrestore(&priv->lock, flags);
 171
 172                 if (priv->cfg->ops->legacy->update_bcast_stations)
 173                         ret = priv->cfg->ops->legacy->update_bcast_stations(priv);
 174
 175  set_ch_out:
 176                 /* The list of supported rates and rate mask can be different
 177                  * for each band; since the band may have changed, reset
 178                  * the rate mask to what mac80211 lists */
 179                 iwl_set_rate(priv);
 180         }
 181
 182         if (changed & (IEEE80211_CONF_CHANGE_PS |
 183                         IEEE80211_CONF_CHANGE_IDLE)) {
 184                 ret = iwl_power_update_mode(priv, false);
 185                 if (ret)
 186                         IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
 187         }
 188
 189         if (changed & IEEE80211_CONF_CHANGE_POWER) {
 190                 IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
 191                         priv->tx_power_user_lmt, conf->power_level);
 192
 193                 iwl_set_tx_power(priv, conf->power_level, false);
 194         }
 195
 196         if (!iwl_is_ready(priv)) {
 197                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 198                 goto out;
 199         }
 200
 201         if (scan_active)
 202                 goto out;
 203
 204         for_each_context(priv, ctx) {
 205                 if (memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging)))
 206                         iwlcore_commit_rxon(priv, ctx);
 207                 else
 208                         IWL_DEBUG_INFO(priv,
 209                                 "Not re-sending same RXON configuration.\n");
 210                 if (ht_changed[ctx->ctxid])
 211                         iwl_update_qos(priv, ctx);
 212         }
 213
 214 out:
 215         IWL_DEBUG_MAC80211(priv, "leave\n");
 216         mutex_unlock(&priv->mutex);
 217         return ret;
 218 }
 219 EXPORT_SYMBOL(iwl_legacy_mac_config);
 220
 221 void iwl_legacy_mac_reset_tsf(struct ieee80211_hw *hw)
 222 {
 223         struct iwl_priv *priv = hw->priv;
 224         unsigned long flags;
 225         /* IBSS can only be the IWL_RXON_CTX_BSS context */
 226         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 227
 228         if (WARN_ON(!priv->cfg->ops->legacy))
 229                 return;
 230
 231         mutex_lock(&priv->mutex);
 232         IWL_DEBUG_MAC80211(priv, "enter\n");
 233
 234         spin_lock_irqsave(&priv->lock, flags);
 235         memset(&priv->current_ht_config, 0, sizeof(struct iwl_ht_config));
 236         spin_unlock_irqrestore(&priv->lock, flags);
 237
 238         spin_lock_irqsave(&priv->lock, flags);
 239
 240         /* new association get rid of ibss beacon skb */
 241         if (priv->beacon_skb)
 242                 dev_kfree_skb(priv->beacon_skb);
 243
 244         priv->beacon_skb = NULL;
 245
 246         priv->timestamp = 0;
 247
 248         spin_unlock_irqrestore(&priv->lock, flags);
 249
 250         iwl_scan_cancel_timeout(priv, 100);
 251         if (!iwl_is_ready_rf(priv)) {
 252                 IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
 253                 mutex_unlock(&priv->mutex);
 254                 return;
 255         }
 256
 257         /* we are restarting association process
 258          * clear RXON_FILTER_ASSOC_MSK bit
 259          */
 260         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 261         iwlcore_commit_rxon(priv, ctx);
 262
 263         iwl_set_rate(priv);
 264
 265         mutex_unlock(&priv->mutex);
 266
 267         IWL_DEBUG_MAC80211(priv, "leave\n");
 268 }
 269 EXPORT_SYMBOL(iwl_legacy_mac_reset_tsf);
 270
 271 static void iwl_ht_conf(struct iwl_priv *priv,
 272                         struct ieee80211_vif *vif)
 273 {
 274         struct iwl_ht_config *ht_conf = &priv->current_ht_config;
 275         struct ieee80211_sta *sta;
 276         struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 277         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 278
 279         IWL_DEBUG_ASSOC(priv, "enter:\n");
 280
 281         if (!ctx->ht.enabled)
 282                 return;
 283
 284         ctx->ht.protection =
 285                 bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
 286         ctx->ht.non_gf_sta_present =
 287                 !!(bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 288
 289         ht_conf->single_chain_sufficient = false;
 290
 291         switch (vif->type) {
 292         case NL80211_IFTYPE_STATION:
 293                 rcu_read_lock();
 294                 sta = ieee80211_find_sta(vif, bss_conf->bssid);
 295                 if (sta) {
 296                         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 297                         int maxstreams;
 298
 299                         maxstreams = (ht_cap->mcs.tx_params &
 300                                       IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
 301                                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
 302                         maxstreams += 1;
 303
 304                         if ((ht_cap->mcs.rx_mask[1] == 0) &&
 305                             (ht_cap->mcs.rx_mask[2] == 0))
 306                                 ht_conf->single_chain_sufficient = true;
 307                         if (maxstreams <= 1)
 308                                 ht_conf->single_chain_sufficient = true;
 309                 } else {
 310                         /*
 311                          * If at all, this can only happen through a race
 312                          * when the AP disconnects us while we're still
 313                          * setting up the connection, in that case mac80211
 314                          * will soon tell us about that.
 315                          */
 316                         ht_conf->single_chain_sufficient = true;
 317                 }
 318                 rcu_read_unlock();
 319                 break;
 320         case NL80211_IFTYPE_ADHOC:
 321                 ht_conf->single_chain_sufficient = true;
 322                 break;
 323         default:
 324                 break;
 325         }
 326
 327         IWL_DEBUG_ASSOC(priv, "leave\n");
 328 }
 329
 330 static inline void iwl_set_no_assoc(struct iwl_priv *priv,
 331                                     struct ieee80211_vif *vif)
 332 {
 333         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 334
 335         iwl_led_disassociate(priv);
 336         /*
 337          * inform the ucode that there is no longer an
 338          * association and that no more packets should be
 339          * sent
 340          */
 341         ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
 342         ctx->staging.assoc_id = 0;
 343         iwlcore_commit_rxon(priv, ctx);
 344 }
 345
 346 static void iwlcore_beacon_update(struct ieee80211_hw *hw,
 347                                   struct ieee80211_vif *vif)
 348 {
 349         struct iwl_priv *priv = hw->priv;
 350         unsigned long flags;
 351         __le64 timestamp;
 352         struct sk_buff *skb = ieee80211_beacon_get(hw, vif);
 353
 354         if (!skb)
 355                 return;
 356
 357         IWL_DEBUG_MAC80211(priv, "enter\n");
 358
 359         lockdep_assert_held(&priv->mutex);
 360
 361         if (!priv->beacon_ctx) {
 362                 IWL_ERR(priv, "update beacon but no beacon context!\n");
 363                 dev_kfree_skb(skb);
 364                 return;
 365         }
 366
 367         spin_lock_irqsave(&priv->lock, flags);
 368
 369         if (priv->beacon_skb)
 370                 dev_kfree_skb(priv->beacon_skb);
 371
 372         priv->beacon_skb = skb;
 373
 374         timestamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
 375         priv->timestamp = le64_to_cpu(timestamp);
 376
 377         IWL_DEBUG_MAC80211(priv, "leave\n");
 378         spin_unlock_irqrestore(&priv->lock, flags);
 379
 380         if (!iwl_is_ready_rf(priv)) {
 381                 IWL_DEBUG_MAC80211(priv, "leave - RF not ready\n");
 382                 return;
 383         }
 384
 385         priv->cfg->ops->legacy->post_associate(priv);
 386 }
 387
 388 void iwl_legacy_mac_bss_info_changed(struct ieee80211_hw *hw,
 389                                      struct ieee80211_vif *vif,
 390                                      struct ieee80211_bss_conf *bss_conf,
 391                                      u32 changes)
 392 {
 393         struct iwl_priv *priv = hw->priv;
 394         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 395         int ret;
 396
 397         if (WARN_ON(!priv->cfg->ops->legacy))
 398                 return;
 399
 400         IWL_DEBUG_MAC80211(priv, "changes = 0x%X\n", changes);
 401
 402         if (!iwl_is_alive(priv))
 403                 return;
 404
 405         mutex_lock(&priv->mutex);
 406
 407         if (changes & BSS_CHANGED_QOS) {
 408                 unsigned long flags;
 409
 410                 spin_lock_irqsave(&priv->lock, flags);
 411                 ctx->qos_data.qos_active = bss_conf->qos;
 412                 iwl_update_qos(priv, ctx);
 413                 spin_unlock_irqrestore(&priv->lock, flags);
 414         }
 415
 416         if (changes & BSS_CHANGED_BEACON_ENABLED) {
 417                 /*
 418                  * the add_interface code must make sure we only ever
 419                  * have a single interface that could be beaconing at
 420                  * any time.
 421                  */
 422                 if (vif->bss_conf.enable_beacon)
 423                         priv->beacon_ctx = ctx;
 424                 else
 425                         priv->beacon_ctx = NULL;
 426         }
 427
 428         if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_AP) {
 429                 dev_kfree_skb(priv->beacon_skb);
 430                 priv->beacon_skb = ieee80211_beacon_get(hw, vif);
 431         }
 432
 433         if (changes & BSS_CHANGED_BEACON_INT && vif->type == NL80211_IFTYPE_AP)
 434                 iwl_send_rxon_timing(priv, ctx);
 435
 436         if (changes & BSS_CHANGED_BSSID) {
 437                 IWL_DEBUG_MAC80211(priv, "BSSID %pM\n", bss_conf->bssid);
 438
 439                 /*
 440                  * If there is currently a HW scan going on in the
 441                  * background then we need to cancel it else the RXON
 442                  * below/in post_associate will fail.
 443                  */
 444                 if (iwl_scan_cancel_timeout(priv, 100)) {
 445                         IWL_WARN(priv, "Aborted scan still in progress after 100ms\n");
 446                         IWL_DEBUG_MAC80211(priv, "leaving - scan abort failed.\n");
 447                         mutex_unlock(&priv->mutex);
 448                         return;
 449                 }
 450
 451                 /* mac80211 only sets assoc when in STATION mode */
 452                 if (vif->type == NL80211_IFTYPE_ADHOC || bss_conf->assoc) {
 453                         memcpy(ctx->staging.bssid_addr,
 454                                bss_conf->bssid, ETH_ALEN);
 455
 456                         /* currently needed in a few places */
 457                         memcpy(priv->bssid, bss_conf->bssid, ETH_ALEN);
 458                 } else {
 459                         ctx->staging.filter_flags &=
 460                                 ~RXON_FILTER_ASSOC_MSK;
 461                 }
 462
 463         }
 464
 465         /*
 466          * This needs to be after setting the BSSID in case
 467          * mac80211 decides to do both changes at once because
 468          * it will invoke post_associate.
 469          */
 470         if (vif->type == NL80211_IFTYPE_ADHOC && changes & BSS_CHANGED_BEACON)
 471                 iwlcore_beacon_update(hw, vif);
 472
 473         if (changes & BSS_CHANGED_ERP_PREAMBLE) {
 474                 IWL_DEBUG_MAC80211(priv, "ERP_PREAMBLE %d\n",
 475                                    bss_conf->use_short_preamble);
 476                 if (bss_conf->use_short_preamble)
 477                         ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 478                 else
 479                         ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 480         }
 481
 482         if (changes & BSS_CHANGED_ERP_CTS_PROT) {
 483                 IWL_DEBUG_MAC80211(priv, "ERP_CTS %d\n", bss_conf->use_cts_prot);
 484                 if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
 485                         ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
 486                 else
 487                         ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
 488                 if (bss_conf->use_cts_prot)
 489                         ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
 490                 else
 491                         ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
 492         }
 493
 494         if (changes & BSS_CHANGED_BASIC_RATES) {
 495                 /* XXX use this information
 496                  *
 497                  * To do that, remove code from iwl_set_rate() and put something
 498                  * like this here:
 499                  *
 500                 if (A-band)
 501                         ctx->staging.ofdm_basic_rates =
 502                                 bss_conf->basic_rates;
 503                 else
 504                         ctx->staging.ofdm_basic_rates =
 505                                 bss_conf->basic_rates >> 4;
 506                         ctx->staging.cck_basic_rates =
 507                                 bss_conf->basic_rates & 0xF;
 508                  */
 509         }
 510
 511         if (changes & BSS_CHANGED_HT) {
 512                 iwl_ht_conf(priv, vif);
 513
 514                 if (priv->cfg->ops->hcmd->set_rxon_chain)
 515                         priv->cfg->ops->hcmd->set_rxon_chain(priv, ctx);
 516         }
 517
 518         if (changes & BSS_CHANGED_ASSOC) {
 519                 IWL_DEBUG_MAC80211(priv, "ASSOC %d\n", bss_conf->assoc);
 520                 if (bss_conf->assoc) {
 521                         priv->timestamp = bss_conf->timestamp;
 522
 523                         iwl_led_associate(priv);
 524
 525                         if (!iwl_is_rfkill(priv))
 526                                 priv->cfg->ops->legacy->post_associate(priv);
 527                 } else
 528                         iwl_set_no_assoc(priv, vif);
 529         }
 530
 531         if (changes && iwl_is_associated_ctx(ctx) && bss_conf->aid) {
 532                 IWL_DEBUG_MAC80211(priv, "Changes (%#x) while associated\n",
 533                                    changes);
 534                 ret = iwl_send_rxon_assoc(priv, ctx);
 535                 if (!ret) {
 536                         /* Sync active_rxon with latest change. */
 537                         memcpy((void *)&ctx->active,
 538                                 &ctx->staging,
 539                                 sizeof(struct iwl_rxon_cmd));
 540                 }
 541         }
 542
 543         if (changes & BSS_CHANGED_BEACON_ENABLED) {
 544                 if (vif->bss_conf.enable_beacon) {
 545                         memcpy(ctx->staging.bssid_addr,
 546                                bss_conf->bssid, ETH_ALEN);
 547                         memcpy(priv->bssid, bss_conf->bssid, ETH_ALEN);
 548                         iwl_led_associate(priv);
 549                         priv->cfg->ops->legacy->config_ap(priv);
 550                 } else
 551                         iwl_set_no_assoc(priv, vif);
 552         }
 553
 554         if (changes & BSS_CHANGED_IBSS) {
 555                 ret = priv->cfg->ops->legacy->manage_ibss_station(priv, vif,
 556                                                         bss_conf->ibss_joined);
 557                 if (ret)
 558                         IWL_ERR(priv, "failed to %s IBSS station %pM\n",
 559                                 bss_conf->ibss_joined ? "add" : "remove",
 560                                 bss_conf->bssid);
 561         }
 562
 563         mutex_unlock(&priv->mutex);
 564
 565         IWL_DEBUG_MAC80211(priv, "leave\n");
 566 }
 567 EXPORT_SYMBOL(iwl_legacy_mac_bss_info_changed);
 568
 569 irqreturn_t iwl_isr_legacy(int irq, void *data)
 570 {
 571         struct iwl_priv *priv = data;
 572         u32 inta, inta_mask;
 573         u32 inta_fh;
 574         unsigned long flags;
 575         if (!priv)
 576                 return IRQ_NONE;
 577
 578         spin_lock_irqsave(&priv->lock, flags);
 579
 580         /* Disable (but don't clear!) interrupts here to avoid
 581          *    back-to-back ISRs and sporadic interrupts from our NIC.
 582          * If we have something to service, the tasklet will re-enable ints.
 583          * If we *don't* have something, we'll re-enable before leaving here. */
 584         inta_mask = iwl_read32(priv, CSR_INT_MASK);  /* just for debug */
 585         iwl_write32(priv, CSR_INT_MASK, 0x00000000);
 586
 587         /* Discover which interrupts are active/pending */
 588         inta = iwl_read32(priv, CSR_INT);
 589         inta_fh = iwl_read32(priv, CSR_FH_INT_STATUS);
 590
 591         /* Ignore interrupt if there's nothing in NIC to service.
 592          * This may be due to IRQ shared with another device,
 593          * or due to sporadic interrupts thrown from our NIC. */
 594         if (!inta && !inta_fh) {
 595                 IWL_DEBUG_ISR(priv,
 596                         "Ignore interrupt, inta == 0, inta_fh == 0\n");
 597                 goto none;
 598         }
 599
 600         if ((inta == 0xFFFFFFFF) || ((inta & 0xFFFFFFF0) == 0xa5a5a5a0)) {
 601                 /* Hardware disappeared. It might have already raised
 602                  * an interrupt */
 603                 IWL_WARN(priv, "HARDWARE GONE?? INTA == 0x%08x\n", inta);
 604                 goto unplugged;
 605         }
 606
 607         IWL_DEBUG_ISR(priv, "ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n",
 608                       inta, inta_mask, inta_fh);
 609
 610         inta &= ~CSR_INT_BIT_SCD;
 611
 612         /* iwl_irq_tasklet() will service interrupts and re-enable them */
 613         if (likely(inta || inta_fh))
 614                 tasklet_schedule(&priv->irq_tasklet);
 615
 616 unplugged:
 617         spin_unlock_irqrestore(&priv->lock, flags);
 618         return IRQ_HANDLED;
 619
 620 none:
 621         /* re-enable interrupts here since we don't have anything to service. */
 622         /* only Re-enable if diabled by irq */
 623         if (test_bit(STATUS_INT_ENABLED, &priv->status))
 624                 iwl_enable_interrupts(priv);
 625         spin_unlock_irqrestore(&priv->lock, flags);
 626         return IRQ_NONE;
 627 }
 628 EXPORT_SYMBOL(iwl_isr_legacy);
 629
 630 /*
 631  *  iwl_legacy_tx_cmd_protection: Set rts/cts. 3945 and 4965 only share this
 632  *  function.
 633  */
 634 void iwl_legacy_tx_cmd_protection(struct iwl_priv *priv,
 635                                struct ieee80211_tx_info *info,
 636                                __le16 fc, __le32 *tx_flags)
 637 {
 638         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 639                 *tx_flags |= TX_CMD_FLG_RTS_MSK;
 640                 *tx_flags &= ~TX_CMD_FLG_CTS_MSK;
 641                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
 642
 643                 if (!ieee80211_is_mgmt(fc))
 644                         return;
 645
 646                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
 647                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
 648                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
 649                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
 650                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
 651                         *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
 652                         *tx_flags |= TX_CMD_FLG_CTS_MSK;
 653                         break;
 654                 }
 655         } else if (info->control.rates[0].flags &
 656                    IEEE80211_TX_RC_USE_CTS_PROTECT) {
 657                 *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
 658                 *tx_flags |= TX_CMD_FLG_CTS_MSK;
 659                 *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
 660         }
 661 }
 662 EXPORT_SYMBOL(iwl_legacy_tx_cmd_protection);