git.oblomov.eu Git - linux-2.6/blob - drivers/net/wireless/iwlwifi/iwl-4965.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * James P. Ketrenos <ipw2100-admin@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/version.h>
  30 #include <linux/init.h>
  31 #include <linux/pci.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/delay.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/wireless.h>
  37 #include <net/mac80211.h>
  38 #include <linux/etherdevice.h>
  39 #include <asm/unaligned.h>
  40
  41 #include "iwl-eeprom.h"
  42 #include "iwl-core.h"
  43 #include "iwl-4965.h"
  44 #include "iwl-helpers.h"
  45
  46 /* module parameters */
  47 static struct iwl_mod_params iwl4965_mod_params = {
  48         .num_of_queues = IWL_MAX_NUM_QUEUES,
  49         .enable_qos = 1,
  50         .amsdu_size_8K = 1,
  51         /* the rest are 0 by default */
  52 };
  53
  54 static void iwl4965_hw_card_show_info(struct iwl_priv *priv);
  55
  56 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  57         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  58                                     IWL_RATE_SISO_##s##M_PLCP, \
  59                                     IWL_RATE_MIMO_##s##M_PLCP, \
  60                                     IWL_RATE_##r##M_IEEE,      \
  61                                     IWL_RATE_##ip##M_INDEX,    \
  62                                     IWL_RATE_##in##M_INDEX,    \
  63                                     IWL_RATE_##rp##M_INDEX,    \
  64                                     IWL_RATE_##rn##M_INDEX,    \
  65                                     IWL_RATE_##pp##M_INDEX,    \
  66                                     IWL_RATE_##np##M_INDEX }
  67
  68 /*
  69  * Parameter order:
  70  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  71  *
  72  * If there isn't a valid next or previous rate then INV is used which
  73  * maps to IWL_RATE_INVALID
  74  *
  75  */
  76 const struct iwl4965_rate_info iwl4965_rates[IWL_RATE_COUNT] = {
  77         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
  78         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
  79         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
  80         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
  81         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
  82         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
  83         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
  84         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
  85         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
  86         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
  87         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
  88         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
  89         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
  90 };
  91
  92 #ifdef CONFIG_IWL4965_HT
  93
  94 static const u16 default_tid_to_tx_fifo[] = {
  95         IWL_TX_FIFO_AC1,
  96         IWL_TX_FIFO_AC0,
  97         IWL_TX_FIFO_AC0,
  98         IWL_TX_FIFO_AC1,
  99         IWL_TX_FIFO_AC2,
 100         IWL_TX_FIFO_AC2,
 101         IWL_TX_FIFO_AC3,
 102         IWL_TX_FIFO_AC3,
 103         IWL_TX_FIFO_NONE,
 104         IWL_TX_FIFO_NONE,
 105         IWL_TX_FIFO_NONE,
 106         IWL_TX_FIFO_NONE,
 107         IWL_TX_FIFO_NONE,
 108         IWL_TX_FIFO_NONE,
 109         IWL_TX_FIFO_NONE,
 110         IWL_TX_FIFO_NONE,
 111         IWL_TX_FIFO_AC3
 112 };
 113
 114 #endif  /*CONFIG_IWL4965_HT */
 115
 116 static int iwl4965_init_drv(struct iwl_priv *priv)
 117 {
 118         int ret;
 119         int i;
 120
 121         priv->antenna = (enum iwl4965_antenna)priv->cfg->mod_params->antenna;
 122         priv->retry_rate = 1;
 123         priv->ibss_beacon = NULL;
 124
 125         spin_lock_init(&priv->lock);
 126         spin_lock_init(&priv->power_data.lock);
 127         spin_lock_init(&priv->sta_lock);
 128         spin_lock_init(&priv->hcmd_lock);
 129         spin_lock_init(&priv->lq_mngr.lock);
 130
 131         for (i = 0; i < IWL_IBSS_MAC_HASH_SIZE; i++)
 132                 INIT_LIST_HEAD(&priv->ibss_mac_hash[i]);
 133
 134         INIT_LIST_HEAD(&priv->free_frames);
 135
 136         mutex_init(&priv->mutex);
 137
 138         /* Clear the driver's (not device's) station table */
 139         iwlcore_clear_stations_table(priv);
 140
 141         priv->data_retry_limit = -1;
 142         priv->ieee_channels = NULL;
 143         priv->ieee_rates = NULL;
 144         priv->band = IEEE80211_BAND_2GHZ;
 145
 146         priv->iw_mode = IEEE80211_IF_TYPE_STA;
 147
 148         priv->use_ant_b_for_management_frame = 1; /* start with ant B */
 149         priv->valid_antenna = 0x7;      /* assume all 3 connected */
 150         priv->ps_mode = IWL_MIMO_PS_NONE;
 151
 152         /* Choose which receivers/antennas to use */
 153         iwl4965_set_rxon_chain(priv);
 154
 155         iwlcore_reset_qos(priv);
 156
 157         priv->qos_data.qos_active = 0;
 158         priv->qos_data.qos_cap.val = 0;
 159
 160         iwlcore_set_rxon_channel(priv, IEEE80211_BAND_2GHZ, 6);
 161
 162         priv->rates_mask = IWL_RATES_MASK;
 163         /* If power management is turned on, default to AC mode */
 164         priv->power_mode = IWL_POWER_AC;
 165         priv->user_txpower_limit = IWL_DEFAULT_TX_POWER;
 166
 167         ret = iwl_init_channel_map(priv);
 168         if (ret) {
 169                 IWL_ERROR("initializing regulatory failed: %d\n", ret);
 170                 goto err;
 171         }
 172
 173         ret = iwl4965_init_geos(priv);
 174         if (ret) {
 175                 IWL_ERROR("initializing geos failed: %d\n", ret);
 176                 goto err_free_channel_map;
 177         }
 178
 179         iwl4965_rate_control_register(priv->hw);
 180         ret = ieee80211_register_hw(priv->hw);
 181         if (ret) {
 182                 IWL_ERROR("Failed to register network device (error %d)\n",
 183                                 ret);
 184                 goto err_free_geos;
 185         }
 186
 187         priv->hw->conf.beacon_int = 100;
 188         priv->mac80211_registered = 1;
 189
 190         return 0;
 191
 192 err_free_geos:
 193         iwl4965_free_geos(priv);
 194 err_free_channel_map:
 195         iwl_free_channel_map(priv);
 196 err:
 197         return ret;
 198 }
 199
 200 static int is_fat_channel(__le32 rxon_flags)
 201 {
 202         return (rxon_flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) ||
 203                 (rxon_flags & RXON_FLG_CHANNEL_MODE_MIXED_MSK);
 204 }
 205
 206 static u8 is_single_stream(struct iwl_priv *priv)
 207 {
 208 #ifdef CONFIG_IWL4965_HT
 209         if (!priv->current_ht_config.is_ht ||
 210             (priv->current_ht_config.supp_mcs_set[1] == 0) ||
 211             (priv->ps_mode == IWL_MIMO_PS_STATIC))
 212                 return 1;
 213 #else
 214         return 1;
 215 #endif  /*CONFIG_IWL4965_HT */
 216         return 0;
 217 }
 218
 219 int iwl4965_hwrate_to_plcp_idx(u32 rate_n_flags)
 220 {
 221         int idx = 0;
 222
 223         /* 4965 HT rate format */
 224         if (rate_n_flags & RATE_MCS_HT_MSK) {
 225                 idx = (rate_n_flags & 0xff);
 226
 227                 if (idx >= IWL_RATE_MIMO_6M_PLCP)
 228                         idx = idx - IWL_RATE_MIMO_6M_PLCP;
 229
 230                 idx += IWL_FIRST_OFDM_RATE;
 231                 /* skip 9M not supported in ht*/
 232                 if (idx >= IWL_RATE_9M_INDEX)
 233                         idx += 1;
 234                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 235                         return idx;
 236
 237         /* 4965 legacy rate format, search for match in table */
 238         } else {
 239                 for (idx = 0; idx < ARRAY_SIZE(iwl4965_rates); idx++)
 240                         if (iwl4965_rates[idx].plcp == (rate_n_flags & 0xFF))
 241                                 return idx;
 242         }
 243
 244         return -1;
 245 }
 246
 247 /**
 248  * translate ucode response to mac80211 tx status control values
 249  */
 250 void iwl4965_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
 251                                   struct ieee80211_tx_control *control)
 252 {
 253         int rate_index;
 254
 255         control->antenna_sel_tx =
 256                 ((rate_n_flags & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_A_POS);
 257         if (rate_n_flags & RATE_MCS_HT_MSK)
 258                 control->flags |= IEEE80211_TXCTL_OFDM_HT;
 259         if (rate_n_flags & RATE_MCS_GF_MSK)
 260                 control->flags |= IEEE80211_TXCTL_GREEN_FIELD;
 261         if (rate_n_flags & RATE_MCS_FAT_MSK)
 262                 control->flags |= IEEE80211_TXCTL_40_MHZ_WIDTH;
 263         if (rate_n_flags & RATE_MCS_DUP_MSK)
 264                 control->flags |= IEEE80211_TXCTL_DUP_DATA;
 265         if (rate_n_flags & RATE_MCS_SGI_MSK)
 266                 control->flags |= IEEE80211_TXCTL_SHORT_GI;
 267         /* since iwl4965_hwrate_to_plcp_idx is band indifferent, we always use
 268          * IEEE80211_BAND_2GHZ band as it contains all the rates */
 269         rate_index = iwl4965_hwrate_to_plcp_idx(rate_n_flags);
 270         if (rate_index == -1)
 271                 control->tx_rate = NULL;
 272         else
 273                 control->tx_rate =
 274                         &priv->bands[IEEE80211_BAND_2GHZ].bitrates[rate_index];
 275 }
 276
 277 /*
 278  * Determine how many receiver/antenna chains to use.
 279  * More provides better reception via diversity.  Fewer saves power.
 280  * MIMO (dual stream) requires at least 2, but works better with 3.
 281  * This does not determine *which* chains to use, just how many.
 282  */
 283 static int iwl4965_get_rx_chain_counter(struct iwl_priv *priv,
 284                                         u8 *idle_state, u8 *rx_state)
 285 {
 286         u8 is_single = is_single_stream(priv);
 287         u8 is_cam = test_bit(STATUS_POWER_PMI, &priv->status) ? 0 : 1;
 288
 289         /* # of Rx chains to use when expecting MIMO. */
 290         if (is_single || (!is_cam && (priv->ps_mode == IWL_MIMO_PS_STATIC)))
 291                 *rx_state = 2;
 292         else
 293                 *rx_state = 3;
 294
 295         /* # Rx chains when idling and maybe trying to save power */
 296         switch (priv->ps_mode) {
 297         case IWL_MIMO_PS_STATIC:
 298         case IWL_MIMO_PS_DYNAMIC:
 299                 *idle_state = (is_cam) ? 2 : 1;
 300                 break;
 301         case IWL_MIMO_PS_NONE:
 302                 *idle_state = (is_cam) ? *rx_state : 1;
 303                 break;
 304         default:
 305                 *idle_state = 1;
 306                 break;
 307         }
 308
 309         return 0;
 310 }
 311
 312 int iwl4965_hw_rxq_stop(struct iwl_priv *priv)
 313 {
 314         int rc;
 315         unsigned long flags;
 316
 317         spin_lock_irqsave(&priv->lock, flags);
 318         rc = iwl4965_grab_nic_access(priv);
 319         if (rc) {
 320                 spin_unlock_irqrestore(&priv->lock, flags);
 321                 return rc;
 322         }
 323
 324         /* stop Rx DMA */
 325         iwl4965_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 326         rc = iwl4965_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG,
 327                                      (1 << 24), 1000);
 328         if (rc < 0)
 329                 IWL_ERROR("Can't stop Rx DMA.\n");
 330
 331         iwl4965_release_nic_access(priv);
 332         spin_unlock_irqrestore(&priv->lock, flags);
 333
 334         return 0;
 335 }
 336
 337 u8 iwl4965_hw_find_station(struct iwl_priv *priv, const u8 *addr)
 338 {
 339         int i;
 340         int start = 0;
 341         int ret = IWL_INVALID_STATION;
 342         unsigned long flags;
 343         DECLARE_MAC_BUF(mac);
 344
 345         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) ||
 346             (priv->iw_mode == IEEE80211_IF_TYPE_AP))
 347                 start = IWL_STA_ID;
 348
 349         if (is_broadcast_ether_addr(addr))
 350                 return priv->hw_setting.bcast_sta_id;
 351
 352         spin_lock_irqsave(&priv->sta_lock, flags);
 353         for (i = start; i < priv->hw_setting.max_stations; i++)
 354                 if ((priv->stations[i].used) &&
 355                     (!compare_ether_addr
 356                      (priv->stations[i].sta.sta.addr, addr))) {
 357                         ret = i;
 358                         goto out;
 359                 }
 360
 361         IWL_DEBUG_ASSOC_LIMIT("can not find STA %s total %d\n",
 362                         print_mac(mac, addr), priv->num_stations);
 363
 364  out:
 365         spin_unlock_irqrestore(&priv->sta_lock, flags);
 366         return ret;
 367 }
 368
 369 static int iwl4965_nic_set_pwr_src(struct iwl_priv *priv, int pwr_max)
 370 {
 371         int ret;
 372         unsigned long flags;
 373
 374         spin_lock_irqsave(&priv->lock, flags);
 375         ret = iwl4965_grab_nic_access(priv);
 376         if (ret) {
 377                 spin_unlock_irqrestore(&priv->lock, flags);
 378                 return ret;
 379         }
 380
 381         if (!pwr_max) {
 382                 u32 val;
 383
 384                 ret = pci_read_config_dword(priv->pci_dev, PCI_POWER_SOURCE,
 385                                            &val);
 386
 387                 if (val & PCI_CFG_PMC_PME_FROM_D3COLD_SUPPORT)
 388                         iwl4965_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
 389                                 APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
 390                                 ~APMG_PS_CTRL_MSK_PWR_SRC);
 391         } else
 392                 iwl4965_set_bits_mask_prph(priv, APMG_PS_CTRL_REG,
 393                         APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
 394                         ~APMG_PS_CTRL_MSK_PWR_SRC);
 395
 396         iwl4965_release_nic_access(priv);
 397         spin_unlock_irqrestore(&priv->lock, flags);
 398
 399         return ret;
 400 }
 401
 402 static int iwl4965_rx_init(struct iwl_priv *priv, struct iwl4965_rx_queue *rxq)
 403 {
 404         int rc;
 405         unsigned long flags;
 406         unsigned int rb_size;
 407
 408         spin_lock_irqsave(&priv->lock, flags);
 409         rc = iwl4965_grab_nic_access(priv);
 410         if (rc) {
 411                 spin_unlock_irqrestore(&priv->lock, flags);
 412                 return rc;
 413         }
 414
 415         if (priv->cfg->mod_params->amsdu_size_8K)
 416                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 417         else
 418                 rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;
 419
 420         /* Stop Rx DMA */
 421         iwl4965_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0);
 422
 423         /* Reset driver's Rx queue write index */
 424         iwl4965_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0);
 425
 426         /* Tell device where to find RBD circular buffer in DRAM */
 427         iwl4965_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG,
 428                              rxq->dma_addr >> 8);
 429
 430         /* Tell device where in DRAM to update its Rx status */
 431         iwl4965_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG,
 432                              (priv->hw_setting.shared_phys +
 433                               offsetof(struct iwl4965_shared, val0)) >> 4);
 434
 435         /* Enable Rx DMA, enable host interrupt, Rx buffer size 4k, 256 RBDs */
 436         iwl4965_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG,
 437                              FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL |
 438                              FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL |
 439                              rb_size |
 440                              /*0x10 << 4 | */
 441                              (RX_QUEUE_SIZE_LOG <<
 442                               FH_RCSR_RX_CONFIG_RBDCB_SIZE_BITSHIFT));
 443
 444         /*
 445          * iwl4965_write32(priv,CSR_INT_COAL_REG,0);
 446          */
 447
 448         iwl4965_release_nic_access(priv);
 449         spin_unlock_irqrestore(&priv->lock, flags);
 450
 451         return 0;
 452 }
 453
 454 /* Tell 4965 where to find the "keep warm" buffer */
 455 static int iwl4965_kw_init(struct iwl_priv *priv)
 456 {
 457         unsigned long flags;
 458         int rc;
 459
 460         spin_lock_irqsave(&priv->lock, flags);
 461         rc = iwl4965_grab_nic_access(priv);
 462         if (rc)
 463                 goto out;
 464
 465         iwl4965_write_direct32(priv, IWL_FH_KW_MEM_ADDR_REG,
 466                              priv->kw.dma_addr >> 4);
 467         iwl4965_release_nic_access(priv);
 468 out:
 469         spin_unlock_irqrestore(&priv->lock, flags);
 470         return rc;
 471 }
 472
 473 static int iwl4965_kw_alloc(struct iwl_priv *priv)
 474 {
 475         struct pci_dev *dev = priv->pci_dev;
 476         struct iwl4965_kw *kw = &priv->kw;
 477
 478         kw->size = IWL4965_KW_SIZE;     /* TBW need set somewhere else */
 479         kw->v_addr = pci_alloc_consistent(dev, kw->size, &kw->dma_addr);
 480         if (!kw->v_addr)
 481                 return -ENOMEM;
 482
 483         return 0;
 484 }
 485
 486 /**
 487  * iwl4965_kw_free - Free the "keep warm" buffer
 488  */
 489 static void iwl4965_kw_free(struct iwl_priv *priv)
 490 {
 491         struct pci_dev *dev = priv->pci_dev;
 492         struct iwl4965_kw *kw = &priv->kw;
 493
 494         if (kw->v_addr) {
 495                 pci_free_consistent(dev, kw->size, kw->v_addr, kw->dma_addr);
 496                 memset(kw, 0, sizeof(*kw));
 497         }
 498 }
 499
 500 /**
 501  * iwl4965_txq_ctx_reset - Reset TX queue context
 502  * Destroys all DMA structures and initialise them again
 503  *
 504  * @param priv
 505  * @return error code
 506  */
 507 static int iwl4965_txq_ctx_reset(struct iwl_priv *priv)
 508 {
 509         int rc = 0;
 510         int txq_id, slots_num;
 511         unsigned long flags;
 512
 513         iwl4965_kw_free(priv);
 514
 515         /* Free all tx/cmd queues and keep-warm buffer */
 516         iwl4965_hw_txq_ctx_free(priv);
 517
 518         /* Alloc keep-warm buffer */
 519         rc = iwl4965_kw_alloc(priv);
 520         if (rc) {
 521                 IWL_ERROR("Keep Warm allocation failed");
 522                 goto error_kw;
 523         }
 524
 525         spin_lock_irqsave(&priv->lock, flags);
 526
 527         rc = iwl4965_grab_nic_access(priv);
 528         if (unlikely(rc)) {
 529                 IWL_ERROR("TX reset failed");
 530                 spin_unlock_irqrestore(&priv->lock, flags);
 531                 goto error_reset;
 532         }
 533
 534         /* Turn off all Tx DMA channels */
 535         iwl4965_write_prph(priv, KDR_SCD_TXFACT, 0);
 536         iwl4965_release_nic_access(priv);
 537         spin_unlock_irqrestore(&priv->lock, flags);
 538
 539         /* Tell 4965 where to find the keep-warm buffer */
 540         rc = iwl4965_kw_init(priv);
 541         if (rc) {
 542                 IWL_ERROR("kw_init failed\n");
 543                 goto error_reset;
 544         }
 545
 546         /* Alloc and init all (default 16) Tx queues,
 547          * including the command queue (#4) */
 548         for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++) {
 549                 slots_num = (txq_id == IWL_CMD_QUEUE_NUM) ?
 550                                         TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
 551                 rc = iwl4965_tx_queue_init(priv, &priv->txq[txq_id], slots_num,
 552                                        txq_id);
 553                 if (rc) {
 554                         IWL_ERROR("Tx %d queue init failed\n", txq_id);
 555                         goto error;
 556                 }
 557         }
 558
 559         return rc;
 560
 561  error:
 562         iwl4965_hw_txq_ctx_free(priv);
 563  error_reset:
 564         iwl4965_kw_free(priv);
 565  error_kw:
 566         return rc;
 567 }
 568
 569 int iwl4965_hw_nic_init(struct iwl_priv *priv)
 570 {
 571         int rc;
 572         unsigned long flags;
 573         struct iwl4965_rx_queue *rxq = &priv->rxq;
 574         u8 rev_id;
 575         u32 val;
 576         u8 val_link;
 577
 578         iwl4965_power_init_handle(priv);
 579
 580         /* nic_init */
 581         spin_lock_irqsave(&priv->lock, flags);
 582
 583         iwl4965_set_bit(priv, CSR_GIO_CHICKEN_BITS,
 584                     CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
 585
 586         iwl4965_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 587         rc = iwl4965_poll_bit(priv, CSR_GP_CNTRL,
 588                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
 589                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
 590         if (rc < 0) {
 591                 spin_unlock_irqrestore(&priv->lock, flags);
 592                 IWL_DEBUG_INFO("Failed to init the card\n");
 593                 return rc;
 594         }
 595
 596         rc = iwl4965_grab_nic_access(priv);
 597         if (rc) {
 598                 spin_unlock_irqrestore(&priv->lock, flags);
 599                 return rc;
 600         }
 601
 602         iwl4965_read_prph(priv, APMG_CLK_CTRL_REG);
 603
 604         iwl4965_write_prph(priv, APMG_CLK_CTRL_REG,
 605                                  APMG_CLK_VAL_DMA_CLK_RQT |
 606                                  APMG_CLK_VAL_BSM_CLK_RQT);
 607         iwl4965_read_prph(priv, APMG_CLK_CTRL_REG);
 608
 609         udelay(20);
 610
 611         iwl4965_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
 612                                     APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
 613
 614         iwl4965_release_nic_access(priv);
 615         iwl4965_write32(priv, CSR_INT_COALESCING, 512 / 32);
 616         spin_unlock_irqrestore(&priv->lock, flags);
 617
 618         /* Determine HW type */
 619         rc = pci_read_config_byte(priv->pci_dev, PCI_REVISION_ID, &rev_id);
 620         if (rc)
 621                 return rc;
 622
 623         IWL_DEBUG_INFO("HW Revision ID = 0x%X\n", rev_id);
 624
 625         iwl4965_nic_set_pwr_src(priv, 1);
 626         spin_lock_irqsave(&priv->lock, flags);
 627
 628         if ((rev_id & 0x80) == 0x80 && (rev_id & 0x7f) < 8) {
 629                 pci_read_config_dword(priv->pci_dev, PCI_REG_WUM8, &val);
 630                 /* Enable No Snoop field */
 631                 pci_write_config_dword(priv->pci_dev, PCI_REG_WUM8,
 632                                        val & ~(1 << 11));
 633         }
 634
 635         spin_unlock_irqrestore(&priv->lock, flags);
 636
 637         if (priv->eeprom.calib_version < EEPROM_TX_POWER_VERSION_NEW) {
 638                 IWL_ERROR("Older EEPROM detected!  Aborting.\n");
 639                 return -EINVAL;
 640         }
 641
 642         pci_read_config_byte(priv->pci_dev, PCI_LINK_CTRL, &val_link);
 643
 644         /* disable L1 entry -- workaround for pre-B1 */
 645         pci_write_config_byte(priv->pci_dev, PCI_LINK_CTRL, val_link & ~0x02);
 646
 647         spin_lock_irqsave(&priv->lock, flags);
 648
 649         /* set CSR_HW_CONFIG_REG for uCode use */
 650
 651         iwl4965_set_bit(priv, CSR_HW_IF_CONFIG_REG,
 652                         CSR49_HW_IF_CONFIG_REG_BIT_4965_R |
 653                         CSR49_HW_IF_CONFIG_REG_BIT_RADIO_SI |
 654                         CSR49_HW_IF_CONFIG_REG_BIT_MAC_SI);
 655
 656         rc = iwl4965_grab_nic_access(priv);
 657         if (rc < 0) {
 658                 spin_unlock_irqrestore(&priv->lock, flags);
 659                 IWL_DEBUG_INFO("Failed to init the card\n");
 660                 return rc;
 661         }
 662
 663         iwl4965_read_prph(priv, APMG_PS_CTRL_REG);
 664         iwl4965_set_bits_prph(priv, APMG_PS_CTRL_REG,
 665                                     APMG_PS_CTRL_VAL_RESET_REQ);
 666         udelay(5);
 667         iwl4965_clear_bits_prph(priv, APMG_PS_CTRL_REG,
 668                                       APMG_PS_CTRL_VAL_RESET_REQ);
 669
 670         iwl4965_release_nic_access(priv);
 671         spin_unlock_irqrestore(&priv->lock, flags);
 672
 673         iwl4965_hw_card_show_info(priv);
 674
 675         /* end nic_init */
 676
 677         /* Allocate the RX queue, or reset if it is already allocated */
 678         if (!rxq->bd) {
 679                 rc = iwl4965_rx_queue_alloc(priv);
 680                 if (rc) {
 681                         IWL_ERROR("Unable to initialize Rx queue\n");
 682                         return -ENOMEM;
 683                 }
 684         } else
 685                 iwl4965_rx_queue_reset(priv, rxq);
 686
 687         iwl4965_rx_replenish(priv);
 688
 689         iwl4965_rx_init(priv, rxq);
 690
 691         spin_lock_irqsave(&priv->lock, flags);
 692
 693         rxq->need_update = 1;
 694         iwl4965_rx_queue_update_write_ptr(priv, rxq);
 695
 696         spin_unlock_irqrestore(&priv->lock, flags);
 697
 698         /* Allocate and init all Tx and Command queues */
 699         rc = iwl4965_txq_ctx_reset(priv);
 700         if (rc)
 701                 return rc;
 702
 703         if (priv->eeprom.sku_cap & EEPROM_SKU_CAP_SW_RF_KILL_ENABLE)
 704                 IWL_DEBUG_RF_KILL("SW RF KILL supported in EEPROM.\n");
 705
 706         if (priv->eeprom.sku_cap & EEPROM_SKU_CAP_HW_RF_KILL_ENABLE)
 707                 IWL_DEBUG_RF_KILL("HW RF KILL supported in EEPROM.\n");
 708
 709         set_bit(STATUS_INIT, &priv->status);
 710
 711         return 0;
 712 }
 713
 714 int iwl4965_hw_nic_stop_master(struct iwl_priv *priv)
 715 {
 716         int rc = 0;
 717         u32 reg_val;
 718         unsigned long flags;
 719
 720         spin_lock_irqsave(&priv->lock, flags);
 721
 722         /* set stop master bit */
 723         iwl4965_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
 724
 725         reg_val = iwl4965_read32(priv, CSR_GP_CNTRL);
 726
 727         if (CSR_GP_CNTRL_REG_FLAG_MAC_POWER_SAVE ==
 728             (reg_val & CSR_GP_CNTRL_REG_MSK_POWER_SAVE_TYPE))
 729                 IWL_DEBUG_INFO("Card in power save, master is already "
 730                                "stopped\n");
 731         else {
 732                 rc = iwl4965_poll_bit(priv, CSR_RESET,
 733                                   CSR_RESET_REG_FLAG_MASTER_DISABLED,
 734                                   CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
 735                 if (rc < 0) {
 736                         spin_unlock_irqrestore(&priv->lock, flags);
 737                         return rc;
 738                 }
 739         }
 740
 741         spin_unlock_irqrestore(&priv->lock, flags);
 742         IWL_DEBUG_INFO("stop master\n");
 743
 744         return rc;
 745 }
 746
 747 /**
 748  * iwl4965_hw_txq_ctx_stop - Stop all Tx DMA channels, free Tx queue memory
 749  */
 750 void iwl4965_hw_txq_ctx_stop(struct iwl_priv *priv)
 751 {
 752
 753         int txq_id;
 754         unsigned long flags;
 755
 756         /* Stop each Tx DMA channel, and wait for it to be idle */
 757         for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++) {
 758                 spin_lock_irqsave(&priv->lock, flags);
 759                 if (iwl4965_grab_nic_access(priv)) {
 760                         spin_unlock_irqrestore(&priv->lock, flags);
 761                         continue;
 762                 }
 763
 764                 iwl4965_write_direct32(priv,
 765                                      IWL_FH_TCSR_CHNL_TX_CONFIG_REG(txq_id),
 766                                      0x0);
 767                 iwl4965_poll_direct_bit(priv, IWL_FH_TSSR_TX_STATUS_REG,
 768                                         IWL_FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE
 769                                         (txq_id), 200);
 770                 iwl4965_release_nic_access(priv);
 771                 spin_unlock_irqrestore(&priv->lock, flags);
 772         }
 773
 774         /* Deallocate memory for all Tx queues */
 775         iwl4965_hw_txq_ctx_free(priv);
 776 }
 777
 778 int iwl4965_hw_nic_reset(struct iwl_priv *priv)
 779 {
 780         int rc = 0;
 781         unsigned long flags;
 782
 783         iwl4965_hw_nic_stop_master(priv);
 784
 785         spin_lock_irqsave(&priv->lock, flags);
 786
 787         iwl4965_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
 788
 789         udelay(10);
 790
 791         iwl4965_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 792         rc = iwl4965_poll_bit(priv, CSR_RESET,
 793                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
 794                           CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25);
 795
 796         udelay(10);
 797
 798         rc = iwl4965_grab_nic_access(priv);
 799         if (!rc) {
 800                 iwl4965_write_prph(priv, APMG_CLK_EN_REG,
 801                                          APMG_CLK_VAL_DMA_CLK_RQT |
 802                                          APMG_CLK_VAL_BSM_CLK_RQT);
 803
 804                 udelay(10);
 805
 806                 iwl4965_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
 807                                 APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
 808
 809                 iwl4965_release_nic_access(priv);
 810         }
 811
 812         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 813         wake_up_interruptible(&priv->wait_command_queue);
 814
 815         spin_unlock_irqrestore(&priv->lock, flags);
 816
 817         return rc;
 818
 819 }
 820
 821 #define REG_RECALIB_PERIOD (60)
 822
 823 /**
 824  * iwl4965_bg_statistics_periodic - Timer callback to queue statistics
 825  *
 826  * This callback is provided in order to queue the statistics_work
 827  * in work_queue context (v. softirq)
 828  *
 829  * This timer function is continually reset to execute within
 830  * REG_RECALIB_PERIOD seconds since the last STATISTICS_NOTIFICATION
 831  * was received.  We need to ensure we receive the statistics in order
 832  * to update the temperature used for calibrating the TXPOWER.  However,
 833  * we can't send the statistics command from softirq context (which
 834  * is the context which timers run at) so we have to queue off the
 835  * statistics_work to actually send the command to the hardware.
 836  */
 837 static void iwl4965_bg_statistics_periodic(unsigned long data)
 838 {
 839         struct iwl_priv *priv = (struct iwl_priv *)data;
 840
 841         queue_work(priv->workqueue, &priv->statistics_work);
 842 }
 843
 844 /**
 845  * iwl4965_bg_statistics_work - Send the statistics request to the hardware.
 846  *
 847  * This is queued by iwl4965_bg_statistics_periodic.
 848  */
 849 static void iwl4965_bg_statistics_work(struct work_struct *work)
 850 {
 851         struct iwl_priv *priv = container_of(work, struct iwl_priv,
 852                                              statistics_work);
 853
 854         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 855                 return;
 856
 857         mutex_lock(&priv->mutex);
 858         iwl4965_send_statistics_request(priv);
 859         mutex_unlock(&priv->mutex);
 860 }
 861
 862 #define CT_LIMIT_CONST          259
 863 #define TM_CT_KILL_THRESHOLD    110
 864
 865 void iwl4965_rf_kill_ct_config(struct iwl_priv *priv)
 866 {
 867         struct iwl4965_ct_kill_config cmd;
 868         u32 R1, R2, R3;
 869         u32 temp_th;
 870         u32 crit_temperature;
 871         unsigned long flags;
 872         int ret = 0;
 873
 874         spin_lock_irqsave(&priv->lock, flags);
 875         iwl4965_write32(priv, CSR_UCODE_DRV_GP1_CLR,
 876                     CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
 877         spin_unlock_irqrestore(&priv->lock, flags);
 878
 879         if (priv->statistics.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK) {
 880                 R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[1]);
 881                 R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[1]);
 882                 R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[1]);
 883         } else {
 884                 R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[0]);
 885                 R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[0]);
 886                 R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[0]);
 887         }
 888
 889         temp_th = CELSIUS_TO_KELVIN(TM_CT_KILL_THRESHOLD);
 890
 891         crit_temperature = ((temp_th * (R3-R1))/CT_LIMIT_CONST) + R2;
 892         cmd.critical_temperature_R =  cpu_to_le32(crit_temperature);
 893         ret = iwl_send_cmd_pdu(priv, REPLY_CT_KILL_CONFIG_CMD,
 894                                sizeof(cmd), &cmd);
 895         if (ret)
 896                 IWL_ERROR("REPLY_CT_KILL_CONFIG_CMD failed\n");
 897         else
 898                 IWL_DEBUG_INFO("REPLY_CT_KILL_CONFIG_CMD succeeded\n");
 899 }
 900
 901 #ifdef CONFIG_IWL4965_SENSITIVITY
 902
 903 /* "false alarms" are signals that our DSP tries to lock onto,
 904  *   but then determines that they are either noise, or transmissions
 905  *   from a distant wireless network (also "noise", really) that get
 906  *   "stepped on" by stronger transmissions within our own network.
 907  * This algorithm attempts to set a sensitivity level that is high
 908  *   enough to receive all of our own network traffic, but not so
 909  *   high that our DSP gets too busy trying to lock onto non-network
 910  *   activity/noise. */
 911 static int iwl4965_sens_energy_cck(struct iwl_priv *priv,
 912                                    u32 norm_fa,
 913                                    u32 rx_enable_time,
 914                                    struct statistics_general_data *rx_info)
 915 {
 916         u32 max_nrg_cck = 0;
 917         int i = 0;
 918         u8 max_silence_rssi = 0;
 919         u32 silence_ref = 0;
 920         u8 silence_rssi_a = 0;
 921         u8 silence_rssi_b = 0;
 922         u8 silence_rssi_c = 0;
 923         u32 val;
 924
 925         /* "false_alarms" values below are cross-multiplications to assess the
 926          *   numbers of false alarms within the measured period of actual Rx
 927          *   (Rx is off when we're txing), vs the min/max expected false alarms
 928          *   (some should be expected if rx is sensitive enough) in a
 929          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 930          *
 931          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 932          *
 933          * */
 934         u32 false_alarms = norm_fa * 200 * 1024;
 935         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 936         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 937         struct iwl4965_sensitivity_data *data = NULL;
 938
 939         data = &(priv->sensitivity_data);
 940
 941         data->nrg_auto_corr_silence_diff = 0;
 942
 943         /* Find max silence rssi among all 3 receivers.
 944          * This is background noise, which may include transmissions from other
 945          *    networks, measured during silence before our network's beacon */
 946         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 947                             ALL_BAND_FILTER) >> 8);
 948         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 949                             ALL_BAND_FILTER) >> 8);
 950         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 951                             ALL_BAND_FILTER) >> 8);
 952
 953         val = max(silence_rssi_b, silence_rssi_c);
 954         max_silence_rssi = max(silence_rssi_a, (u8) val);
 955
 956         /* Store silence rssi in 20-beacon history table */
 957         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 958         data->nrg_silence_idx++;
 959         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 960                 data->nrg_silence_idx = 0;
 961
 962         /* Find max silence rssi across 20 beacon history */
 963         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 964                 val = data->nrg_silence_rssi[i];
 965                 silence_ref = max(silence_ref, val);
 966         }
 967         IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
 968                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
 969                         silence_ref);
 970
 971         /* Find max rx energy (min value!) among all 3 receivers,
 972          *   measured during beacon frame.
 973          * Save it in 10-beacon history table. */
 974         i = data->nrg_energy_idx;
 975         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 976         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 977
 978         data->nrg_energy_idx++;
 979         if (data->nrg_energy_idx >= 10)
 980                 data->nrg_energy_idx = 0;
 981
 982         /* Find min rx energy (max value) across 10 beacon history.
 983          * This is the minimum signal level that we want to receive well.
 984          * Add backoff (margin so we don't miss slightly lower energy frames).
 985          * This establishes an upper bound (min value) for energy threshold. */
 986         max_nrg_cck = data->nrg_value[0];
 987         for (i = 1; i < 10; i++)
 988                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 989         max_nrg_cck += 6;
 990
 991         IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 992                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 993                         rx_info->beacon_energy_c, max_nrg_cck - 6);
 994
 995         /* Count number of consecutive beacons with fewer-than-desired
 996          *   false alarms. */
 997         if (false_alarms < min_false_alarms)
 998                 data->num_in_cck_no_fa++;
 999         else
1000                 data->num_in_cck_no_fa = 0;
1001         IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n",
1002                         data->num_in_cck_no_fa);
1003
1004         /* If we got too many false alarms this time, reduce sensitivity */
1005         if (false_alarms > max_false_alarms) {
1006                 IWL_DEBUG_CALIB("norm FA %u > max FA %u\n",
1007                              false_alarms, max_false_alarms);
1008                 IWL_DEBUG_CALIB("... reducing sensitivity\n");
1009                 data->nrg_curr_state = IWL_FA_TOO_MANY;
1010
1011                 if (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK) {
1012                         /* Store for "fewer than desired" on later beacon */
1013                         data->nrg_silence_ref = silence_ref;
1014
1015                         /* increase energy threshold (reduce nrg value)
1016                          *   to decrease sensitivity */
1017                         if (data->nrg_th_cck > (NRG_MAX_CCK + NRG_STEP_CCK))
1018                                 data->nrg_th_cck = data->nrg_th_cck
1019                                                          - NRG_STEP_CCK;
1020                 }
1021
1022                 /* increase auto_corr values to decrease sensitivity */
1023                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
1024                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
1025                 else {
1026                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
1027                         data->auto_corr_cck = min((u32)AUTO_CORR_MAX_CCK, val);
1028                 }
1029                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
1030                 data->auto_corr_cck_mrc = min((u32)AUTO_CORR_MAX_CCK_MRC, val);
1031
1032         /* Else if we got fewer than desired, increase sensitivity */
1033         } else if (false_alarms < min_false_alarms) {
1034                 data->nrg_curr_state = IWL_FA_TOO_FEW;
1035
1036                 /* Compare silence level with silence level for most recent
1037                  *   healthy number or too many false alarms */
1038                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
1039                                                    (s32)silence_ref;
1040
1041                 IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n",
1042                          false_alarms, min_false_alarms,
1043                          data->nrg_auto_corr_silence_diff);
1044
1045                 /* Increase value to increase sensitivity, but only if:
1046                  * 1a) previous beacon did *not* have *too many* false alarms
1047                  * 1b) AND there's a significant difference in Rx levels
1048                  *      from a previous beacon with too many, or healthy # FAs
1049                  * OR 2) We've seen a lot of beacons (100) with too few
1050                  *       false alarms */
1051                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
1052                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
1053                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
1054
1055                         IWL_DEBUG_CALIB("... increasing sensitivity\n");
1056                         /* Increase nrg value to increase sensitivity */
1057                         val = data->nrg_th_cck + NRG_STEP_CCK;
1058                         data->nrg_th_cck = min((u32)NRG_MIN_CCK, val);
1059
1060                         /* Decrease auto_corr values to increase sensitivity */
1061                         val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
1062                         data->auto_corr_cck = max((u32)AUTO_CORR_MIN_CCK, val);
1063
1064                         val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
1065                         data->auto_corr_cck_mrc =
1066                                          max((u32)AUTO_CORR_MIN_CCK_MRC, val);
1067
1068                 } else
1069                         IWL_DEBUG_CALIB("... but not changing sensitivity\n");
1070
1071         /* Else we got a healthy number of false alarms, keep status quo */
1072         } else {
1073                 IWL_DEBUG_CALIB(" FA in safe zone\n");
1074                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
1075
1076                 /* Store for use in "fewer than desired" with later beacon */
1077                 data->nrg_silence_ref = silence_ref;
1078
1079                 /* If previous beacon had too many false alarms,
1080                  *   give it some extra margin by reducing sensitivity again
1081                  *   (but don't go below measured energy of desired Rx) */
1082                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
1083                         IWL_DEBUG_CALIB("... increasing margin\n");
1084                         data->nrg_th_cck -= NRG_MARGIN;
1085                 }
1086         }
1087
1088         /* Make sure the energy threshold does not go above the measured
1089          * energy of the desired Rx signals (reduced by backoff margin),
1090          * or else we might start missing Rx frames.
1091          * Lower value is higher energy, so we use max()!
1092          */
1093         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
1094         IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);
1095
1096         data->nrg_prev_state = data->nrg_curr_state;
1097
1098         return 0;
1099 }
1100
1101
1102 static int iwl4965_sens_auto_corr_ofdm(struct iwl_priv *priv,
1103                                        u32 norm_fa,
1104                                        u32 rx_enable_time)
1105 {
1106         u32 val;
1107         u32 false_alarms = norm_fa * 200 * 1024;
1108         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
1109         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
1110         struct iwl4965_sensitivity_data *data = NULL;
1111
1112         data = &(priv->sensitivity_data);
1113
1114         /* If we got too many false alarms this time, reduce sensitivity */
1115         if (false_alarms > max_false_alarms) {
1116
1117                 IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n",
1118                              false_alarms, max_false_alarms);
1119
1120                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
1121                 data->auto_corr_ofdm =
1122                                 min((u32)AUTO_CORR_MAX_OFDM, val);
1123
1124                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
1125                 data->auto_corr_ofdm_mrc =
1126                                 min((u32)AUTO_CORR_MAX_OFDM_MRC, val);
1127
1128                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
1129                 data->auto_corr_ofdm_x1 =
1130                                 min((u32)AUTO_CORR_MAX_OFDM_X1, val);
1131
1132                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
1133                 data->auto_corr_ofdm_mrc_x1 =
1134                                 min((u32)AUTO_CORR_MAX_OFDM_MRC_X1, val);
1135         }
1136
1137         /* Else if we got fewer than desired, increase sensitivity */
1138         else if (false_alarms < min_false_alarms) {
1139
1140                 IWL_DEBUG_CALIB("norm FA %u < min FA %u\n",
1141                              false_alarms, min_false_alarms);
1142
1143                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
1144                 data->auto_corr_ofdm =
1145                                 max((u32)AUTO_CORR_MIN_OFDM, val);
1146
1147                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
1148                 data->auto_corr_ofdm_mrc =
1149                                 max((u32)AUTO_CORR_MIN_OFDM_MRC, val);
1150
1151                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
1152                 data->auto_corr_ofdm_x1 =
1153                                 max((u32)AUTO_CORR_MIN_OFDM_X1, val);
1154
1155                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
1156                 data->auto_corr_ofdm_mrc_x1 =
1157                                 max((u32)AUTO_CORR_MIN_OFDM_MRC_X1, val);
1158         }
1159
1160         else
1161                 IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
1162                          min_false_alarms, false_alarms, max_false_alarms);
1163
1164         return 0;
1165 }
1166
1167 static int iwl4965_sensitivity_callback(struct iwl_priv *priv,
1168                                     struct iwl_cmd *cmd, struct sk_buff *skb)
1169 {
1170         /* We didn't cache the SKB; let the caller free it */
1171         return 1;
1172 }
1173
1174 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
1175 static int iwl4965_sensitivity_write(struct iwl_priv *priv, u8 flags)
1176 {
1177         struct iwl4965_sensitivity_cmd cmd ;
1178         struct iwl4965_sensitivity_data *data = NULL;
1179         struct iwl_host_cmd cmd_out = {
1180                 .id = SENSITIVITY_CMD,
1181                 .len = sizeof(struct iwl4965_sensitivity_cmd),
1182                 .meta.flags = flags,
1183                 .data = &cmd,
1184         };
1185         int ret;
1186
1187         data = &(priv->sensitivity_data);
1188
1189         memset(&cmd, 0, sizeof(cmd));
1190
1191         cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
1192                                 cpu_to_le16((u16)data->auto_corr_ofdm);
1193         cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
1194                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
1195         cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
1196                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
1197         cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
1198                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
1199
1200         cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
1201                                 cpu_to_le16((u16)data->auto_corr_cck);
1202         cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
1203                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
1204
1205         cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
1206                                 cpu_to_le16((u16)data->nrg_th_cck);
1207         cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
1208                                 cpu_to_le16((u16)data->nrg_th_ofdm);
1209
1210         cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
1211                                 __constant_cpu_to_le16(190);
1212         cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
1213                                 __constant_cpu_to_le16(390);
1214         cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
1215                                 __constant_cpu_to_le16(62);
1216
1217         IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
1218                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
1219                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
1220                         data->nrg_th_ofdm);
1221
1222         IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n",
1223                         data->auto_corr_cck, data->auto_corr_cck_mrc,
1224                         data->nrg_th_cck);
1225
1226         /* Update uCode's "work" table, and copy it to DSP */
1227         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
1228
1229         if (flags & CMD_ASYNC)
1230                 cmd_out.meta.u.callback = iwl4965_sensitivity_callback;
1231
1232         /* Don't send command to uCode if nothing has changed */
1233         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
1234                     sizeof(u16)*HD_TABLE_SIZE)) {
1235                 IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n");
1236                 return 0;
1237         }
1238
1239         /* Copy table for comparison next time */
1240         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
1241                sizeof(u16)*HD_TABLE_SIZE);
1242
1243         ret = iwl_send_cmd(priv, &cmd_out);
1244         if (ret)
1245                 IWL_ERROR("SENSITIVITY_CMD failed\n");
1246
1247         return ret;
1248 }
1249
1250 void iwl4965_init_sensitivity(struct iwl_priv *priv, u8 flags, u8 force)
1251 {
1252         struct iwl4965_sensitivity_data *data = NULL;
1253         int i;
1254         int ret  = 0;
1255
1256         IWL_DEBUG_CALIB("Start iwl4965_init_sensitivity\n");
1257
1258         if (force)
1259                 memset(&(priv->sensitivity_tbl[0]), 0,
1260                         sizeof(u16)*HD_TABLE_SIZE);
1261
1262         /* Clear driver's sensitivity algo data */
1263         data = &(priv->sensitivity_data);
1264         memset(data, 0, sizeof(struct iwl4965_sensitivity_data));
1265
1266         data->num_in_cck_no_fa = 0;
1267         data->nrg_curr_state = IWL_FA_TOO_MANY;
1268         data->nrg_prev_state = IWL_FA_TOO_MANY;
1269         data->nrg_silence_ref = 0;
1270         data->nrg_silence_idx = 0;
1271         data->nrg_energy_idx = 0;
1272
1273         for (i = 0; i < 10; i++)
1274                 data->nrg_value[i] = 0;
1275
1276         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
1277                 data->nrg_silence_rssi[i] = 0;
1278
1279         data->auto_corr_ofdm = 90;
1280         data->auto_corr_ofdm_mrc = 170;
1281         data->auto_corr_ofdm_x1  = 105;
1282         data->auto_corr_ofdm_mrc_x1 = 220;
1283         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
1284         data->auto_corr_cck_mrc = 200;
1285         data->nrg_th_cck = 100;
1286         data->nrg_th_ofdm = 100;
1287
1288         data->last_bad_plcp_cnt_ofdm = 0;
1289         data->last_fa_cnt_ofdm = 0;
1290         data->last_bad_plcp_cnt_cck = 0;
1291         data->last_fa_cnt_cck = 0;
1292
1293         /* Clear prior Sensitivity command data to force send to uCode */
1294         if (force)
1295                 memset(&(priv->sensitivity_tbl[0]), 0,
1296                     sizeof(u16)*HD_TABLE_SIZE);
1297
1298         ret |= iwl4965_sensitivity_write(priv, flags);
1299         IWL_DEBUG_CALIB("<<return 0x%X\n", ret);
1300
1301         return;
1302 }
1303
1304
1305 /* Reset differential Rx gains in NIC to prepare for chain noise calibration.
1306  * Called after every association, but this runs only once!
1307  *  ... once chain noise is calibrated the first time, it's good forever.  */
1308 void iwl4965_chain_noise_reset(struct iwl_priv *priv)
1309 {
1310         struct iwl4965_chain_noise_data *data = NULL;
1311
1312         data = &(priv->chain_noise_data);
1313         if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl4965_is_associated(priv)) {
1314                 struct iwl4965_calibration_cmd cmd;
1315
1316                 memset(&cmd, 0, sizeof(cmd));
1317                 cmd.opCode = PHY_CALIBRATE_DIFF_GAIN_CMD;
1318                 cmd.diff_gain_a = 0;
1319                 cmd.diff_gain_b = 0;
1320                 cmd.diff_gain_c = 0;
1321                 iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
1322                                  sizeof(cmd), &cmd);
1323                 msleep(4);
1324                 data->state = IWL_CHAIN_NOISE_ACCUMULATE;
1325                 IWL_DEBUG_CALIB("Run chain_noise_calibrate\n");
1326         }
1327         return;
1328 }
1329
1330 /*
1331  * Accumulate 20 beacons of signal and noise statistics for each of
1332  *   3 receivers/antennas/rx-chains, then figure out:
1333  * 1)  Which antennas are connected.
1334  * 2)  Differential rx gain settings to balance the 3 receivers.
1335  */
1336 static void iwl4965_noise_calibration(struct iwl_priv *priv,
1337                                       struct iwl4965_notif_statistics *stat_resp)
1338 {
1339         struct iwl4965_chain_noise_data *data = NULL;
1340         int ret = 0;
1341
1342         u32 chain_noise_a;
1343         u32 chain_noise_b;
1344         u32 chain_noise_c;
1345         u32 chain_sig_a;
1346         u32 chain_sig_b;
1347         u32 chain_sig_c;
1348         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
1349         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
1350         u32 max_average_sig;
1351         u16 max_average_sig_antenna_i;
1352         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
1353         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
1354         u16 i = 0;
1355         u16 chan_num = INITIALIZATION_VALUE;
1356         u32 band = INITIALIZATION_VALUE;
1357         u32 active_chains = 0;
1358         unsigned long flags;
1359         struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
1360
1361         data = &(priv->chain_noise_data);
1362
1363         /* Accumulate just the first 20 beacons after the first association,
1364          *   then we're done forever. */
1365         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
1366                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
1367                         IWL_DEBUG_CALIB("Wait for noise calib reset\n");
1368                 return;
1369         }
1370
1371         spin_lock_irqsave(&priv->lock, flags);
1372         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
1373                 IWL_DEBUG_CALIB(" << Interference data unavailable\n");
1374                 spin_unlock_irqrestore(&priv->lock, flags);
1375                 return;
1376         }
1377
1378         band = (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) ? 0 : 1;
1379         chan_num = le16_to_cpu(priv->staging_rxon.channel);
1380
1381         /* Make sure we accumulate data for just the associated channel
1382          *   (even if scanning). */
1383         if ((chan_num != (le32_to_cpu(stat_resp->flag) >> 16)) ||
1384             ((STATISTICS_REPLY_FLG_BAND_24G_MSK ==
1385              (stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK)) && band)) {
1386                 IWL_DEBUG_CALIB("Stats not from chan=%d, band=%d\n",
1387                                 chan_num, band);
1388                 spin_unlock_irqrestore(&priv->lock, flags);
1389                 return;
1390         }
1391
1392         /* Accumulate beacon statistics values across 20 beacons */
1393         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
1394                                 IN_BAND_FILTER;
1395         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
1396                                 IN_BAND_FILTER;
1397         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
1398                                 IN_BAND_FILTER;
1399
1400         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
1401         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
1402         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
1403
1404         spin_unlock_irqrestore(&priv->lock, flags);
1405
1406         data->beacon_count++;
1407
1408         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
1409         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
1410         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
1411
1412         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
1413         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
1414         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
1415
1416         IWL_DEBUG_CALIB("chan=%d, band=%d, beacon=%d\n", chan_num, band,
1417                         data->beacon_count);
1418         IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n",
1419                         chain_sig_a, chain_sig_b, chain_sig_c);
1420         IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n",
1421                         chain_noise_a, chain_noise_b, chain_noise_c);
1422
1423         /* If this is the 20th beacon, determine:
1424          * 1)  Disconnected antennas (using signal strengths)
1425          * 2)  Differential gain (using silence noise) to balance receivers */
1426         if (data->beacon_count == CAL_NUM_OF_BEACONS) {
1427
1428                 /* Analyze signal for disconnected antenna */
1429                 average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS;
1430                 average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS;
1431                 average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS;
1432
1433                 if (average_sig[0] >= average_sig[1]) {
1434                         max_average_sig = average_sig[0];
1435                         max_average_sig_antenna_i = 0;
1436                         active_chains = (1 << max_average_sig_antenna_i);
1437                 } else {
1438                         max_average_sig = average_sig[1];
1439                         max_average_sig_antenna_i = 1;
1440                         active_chains = (1 << max_average_sig_antenna_i);
1441                 }
1442
1443                 if (average_sig[2] >= max_average_sig) {
1444                         max_average_sig = average_sig[2];
1445                         max_average_sig_antenna_i = 2;
1446                         active_chains = (1 << max_average_sig_antenna_i);
1447                 }
1448
1449                 IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n",
1450                              average_sig[0], average_sig[1], average_sig[2]);
1451                 IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n",
1452                              max_average_sig, max_average_sig_antenna_i);
1453
1454                 /* Compare signal strengths for all 3 receivers. */
1455                 for (i = 0; i < NUM_RX_CHAINS; i++) {
1456                         if (i != max_average_sig_antenna_i) {
1457                                 s32 rssi_delta = (max_average_sig -
1458                                                   average_sig[i]);
1459
1460                                 /* If signal is very weak, compared with
1461                                  * strongest, mark it as disconnected. */
1462                                 if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
1463                                         data->disconn_array[i] = 1;
1464                                 else
1465                                         active_chains |= (1 << i);
1466                         IWL_DEBUG_CALIB("i = %d  rssiDelta = %d  "
1467                                      "disconn_array[i] = %d\n",
1468                                      i, rssi_delta, data->disconn_array[i]);
1469                         }
1470                 }
1471
1472                 /*If both chains A & B are disconnected -
1473                  * connect B and leave A as is */
1474                 if (data->disconn_array[CHAIN_A] &&
1475                     data->disconn_array[CHAIN_B]) {
1476                         data->disconn_array[CHAIN_B] = 0;
1477                         active_chains |= (1 << CHAIN_B);
1478                         IWL_DEBUG_CALIB("both A & B chains are disconnected! "
1479                                      "W/A - declare B as connected\n");
1480                 }
1481
1482                 IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
1483                                 active_chains);
1484
1485                 /* Save for use within RXON, TX, SCAN commands, etc. */
1486                 priv->valid_antenna = active_chains;
1487
1488                 /* Analyze noise for rx balance */
1489                 average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
1490                 average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
1491                 average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS);
1492
1493                 for (i = 0; i < NUM_RX_CHAINS; i++) {
1494                         if (!(data->disconn_array[i]) &&
1495                            (average_noise[i] <= min_average_noise)) {
1496                                 /* This means that chain i is active and has
1497                                  * lower noise values so far: */
1498                                 min_average_noise = average_noise[i];
1499                                 min_average_noise_antenna_i = i;
1500                         }
1501                 }
1502
1503                 data->delta_gain_code[min_average_noise_antenna_i] = 0;
1504
1505                 IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n",
1506                                 average_noise[0], average_noise[1],
1507                                 average_noise[2]);
1508
1509                 IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n",
1510                                 min_average_noise, min_average_noise_antenna_i);
1511
1512                 for (i = 0; i < NUM_RX_CHAINS; i++) {
1513                         s32 delta_g = 0;
1514
1515                         if (!(data->disconn_array[i]) &&
1516                             (data->delta_gain_code[i] ==
1517                              CHAIN_NOISE_DELTA_GAIN_INIT_VAL)) {
1518                                 delta_g = average_noise[i] - min_average_noise;
1519                                 data->delta_gain_code[i] = (u8)((delta_g *
1520                                                                     10) / 15);
1521                                 if (CHAIN_NOISE_MAX_DELTA_GAIN_CODE <
1522                                    data->delta_gain_code[i])
1523                                         data->delta_gain_code[i] =
1524                                           CHAIN_NOISE_MAX_DELTA_GAIN_CODE;
1525
1526                                 data->delta_gain_code[i] =
1527                                         (data->delta_gain_code[i] | (1 << 2));
1528                         } else
1529                                 data->delta_gain_code[i] = 0;
1530                 }
1531                 IWL_DEBUG_CALIB("delta_gain_codes: a %d b %d c %d\n",
1532                              data->delta_gain_code[0],
1533                              data->delta_gain_code[1],
1534                              data->delta_gain_code[2]);
1535
1536                 /* Differential gain gets sent to uCode only once */
1537                 if (!data->radio_write) {
1538                         struct iwl4965_calibration_cmd cmd;
1539                         data->radio_write = 1;
1540
1541                         memset(&cmd, 0, sizeof(cmd));
1542                         cmd.opCode = PHY_CALIBRATE_DIFF_GAIN_CMD;
1543                         cmd.diff_gain_a = data->delta_gain_code[0];
1544                         cmd.diff_gain_b = data->delta_gain_code[1];
1545                         cmd.diff_gain_c = data->delta_gain_code[2];
1546                         ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
1547                                               sizeof(cmd), &cmd);
1548                         if (ret)
1549                                 IWL_DEBUG_CALIB("fail sending cmd "
1550                                              "REPLY_PHY_CALIBRATION_CMD \n");
1551
1552                         /* TODO we might want recalculate
1553                          * rx_chain in rxon cmd */
1554
1555                         /* Mark so we run this algo only once! */
1556                         data->state = IWL_CHAIN_NOISE_CALIBRATED;
1557                 }
1558                 data->chain_noise_a = 0;
1559                 data->chain_noise_b = 0;
1560                 data->chain_noise_c = 0;
1561                 data->chain_signal_a = 0;
1562                 data->chain_signal_b = 0;
1563                 data->chain_signal_c = 0;
1564                 data->beacon_count = 0;
1565         }
1566         return;
1567 }
1568
1569 static void iwl4965_sensitivity_calibration(struct iwl_priv *priv,
1570                                             struct iwl4965_notif_statistics *resp)
1571 {
1572         u32 rx_enable_time;
1573         u32 fa_cck;
1574         u32 fa_ofdm;
1575         u32 bad_plcp_cck;
1576         u32 bad_plcp_ofdm;
1577         u32 norm_fa_ofdm;
1578         u32 norm_fa_cck;
1579         struct iwl4965_sensitivity_data *data = NULL;
1580         struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
1581         struct statistics_rx *statistics = &(resp->rx);
1582         unsigned long flags;
1583         struct statistics_general_data statis;
1584         int ret;
1585
1586         data = &(priv->sensitivity_data);
1587
1588         if (!iwl4965_is_associated(priv)) {
1589                 IWL_DEBUG_CALIB("<< - not associated\n");
1590                 return;
1591         }
1592
1593         spin_lock_irqsave(&priv->lock, flags);
1594         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
1595                 IWL_DEBUG_CALIB("<< invalid data.\n");
1596                 spin_unlock_irqrestore(&priv->lock, flags);
1597                 return;
1598         }
1599
1600         /* Extract Statistics: */
1601         rx_enable_time = le32_to_cpu(rx_info->channel_load);
1602         fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
1603         fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
1604         bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
1605         bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);
1606
1607         statis.beacon_silence_rssi_a =
1608                         le32_to_cpu(statistics->general.beacon_silence_rssi_a);
1609         statis.beacon_silence_rssi_b =
1610                         le32_to_cpu(statistics->general.beacon_silence_rssi_b);
1611         statis.beacon_silence_rssi_c =
1612                         le32_to_cpu(statistics->general.beacon_silence_rssi_c);
1613         statis.beacon_energy_a =
1614                         le32_to_cpu(statistics->general.beacon_energy_a);
1615         statis.beacon_energy_b =
1616                         le32_to_cpu(statistics->general.beacon_energy_b);
1617         statis.beacon_energy_c =
1618                         le32_to_cpu(statistics->general.beacon_energy_c);
1619
1620         spin_unlock_irqrestore(&priv->lock, flags);
1621
1622         IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);
1623
1624         if (!rx_enable_time) {
1625                 IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n");
1626                 return;
1627         }
1628
1629         /* These statistics increase monotonically, and do not reset
1630          *   at each beacon.  Calculate difference from last value, or just
1631          *   use the new statistics value if it has reset or wrapped around. */
1632         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
1633                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
1634         else {
1635                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
1636                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
1637         }
1638
1639         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
1640                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
1641         else {
1642                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
1643                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
1644         }
1645
1646         if (data->last_fa_cnt_ofdm > fa_ofdm)
1647                 data->last_fa_cnt_ofdm = fa_ofdm;
1648         else {
1649                 fa_ofdm -= data->last_fa_cnt_ofdm;
1650                 data->last_fa_cnt_ofdm += fa_ofdm;
1651         }
1652
1653         if (data->last_fa_cnt_cck > fa_cck)
1654                 data->last_fa_cnt_cck = fa_cck;
1655         else {
1656                 fa_cck -= data->last_fa_cnt_cck;
1657                 data->last_fa_cnt_cck += fa_cck;
1658         }
1659
1660         /* Total aborted signal locks */
1661         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
1662         norm_fa_cck = fa_cck + bad_plcp_cck;
1663
1664         IWL_DEBUG_CALIB("cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
1665                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
1666
1667         iwl4965_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
1668         iwl4965_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
1669         ret = iwl4965_sensitivity_write(priv, CMD_ASYNC);
1670
1671         return;
1672 }
1673
1674 static void iwl4965_bg_sensitivity_work(struct work_struct *work)
1675 {
1676         struct iwl_priv *priv = container_of(work, struct iwl_priv,
1677                         sensitivity_work);
1678
1679         mutex_lock(&priv->mutex);
1680
1681         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
1682             test_bit(STATUS_SCANNING, &priv->status)) {
1683                 mutex_unlock(&priv->mutex);
1684                 return;
1685         }
1686
1687         if (priv->start_calib) {
1688                 iwl4965_noise_calibration(priv, &priv->statistics);
1689
1690                 if (priv->sensitivity_data.state ==
1691                                         IWL_SENS_CALIB_NEED_REINIT) {
1692                         iwl4965_init_sensitivity(priv, CMD_ASYNC, 0);
1693                         priv->sensitivity_data.state = IWL_SENS_CALIB_ALLOWED;
1694                 } else
1695                         iwl4965_sensitivity_calibration(priv,
1696                                         &priv->statistics);
1697         }
1698
1699         mutex_unlock(&priv->mutex);
1700         return;
1701 }
1702 #endif /*CONFIG_IWL4965_SENSITIVITY*/
1703
1704 static void iwl4965_bg_txpower_work(struct work_struct *work)
1705 {
1706         struct iwl_priv *priv = container_of(work, struct iwl_priv,
1707                         txpower_work);
1708
1709         /* If a scan happened to start before we got here
1710          * then just return; the statistics notification will
1711          * kick off another scheduled work to compensate for
1712          * any temperature delta we missed here. */
1713         if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
1714             test_bit(STATUS_SCANNING, &priv->status))
1715                 return;
1716
1717         mutex_lock(&priv->mutex);
1718
1719         /* Regardless of if we are assocaited, we must reconfigure the
1720          * TX power since frames can be sent on non-radar channels while
1721          * not associated */
1722         iwl4965_hw_reg_send_txpower(priv);
1723
1724         /* Update last_temperature to keep is_calib_needed from running
1725          * when it isn't needed... */
1726         priv->last_temperature = priv->temperature;
1727
1728         mutex_unlock(&priv->mutex);
1729 }
1730
1731 /*
1732  * Acquire priv->lock before calling this function !
1733  */
1734 static void iwl4965_set_wr_ptrs(struct iwl_priv *priv, int txq_id, u32 index)
1735 {
1736         iwl4965_write_direct32(priv, HBUS_TARG_WRPTR,
1737                              (index & 0xff) | (txq_id << 8));
1738         iwl4965_write_prph(priv, KDR_SCD_QUEUE_RDPTR(txq_id), index);
1739 }
1740
1741 /**
1742  * iwl4965_tx_queue_set_status - (optionally) start Tx/Cmd queue
1743  * @tx_fifo_id: Tx DMA/FIFO channel (range 0-7) that the queue will feed
1744  * @scd_retry: (1) Indicates queue will be used in aggregation mode
1745  *
1746  * NOTE:  Acquire priv->lock before calling this function !
1747  */
1748 static void iwl4965_tx_queue_set_status(struct iwl_priv *priv,
1749                                         struct iwl4965_tx_queue *txq,
1750                                         int tx_fifo_id, int scd_retry)
1751 {
1752         int txq_id = txq->q.id;
1753
1754         /* Find out whether to activate Tx queue */
1755         int active = test_bit(txq_id, &priv->txq_ctx_active_msk)?1:0;
1756
1757         /* Set up and activate */
1758         iwl4965_write_prph(priv, KDR_SCD_QUEUE_STATUS_BITS(txq_id),
1759                                  (active << SCD_QUEUE_STTS_REG_POS_ACTIVE) |
1760                                  (tx_fifo_id << SCD_QUEUE_STTS_REG_POS_TXF) |
1761                                  (scd_retry << SCD_QUEUE_STTS_REG_POS_WSL) |
1762                                  (scd_retry << SCD_QUEUE_STTS_REG_POS_SCD_ACK) |
1763                                  SCD_QUEUE_STTS_REG_MSK);
1764
1765         txq->sched_retry = scd_retry;
1766
1767         IWL_DEBUG_INFO("%s %s Queue %d on AC %d\n",
1768                        active ? "Activate" : "Deactivate",
1769                        scd_retry ? "BA" : "AC", txq_id, tx_fifo_id);
1770 }
1771
1772 static const u16 default_queue_to_tx_fifo[] = {
1773         IWL_TX_FIFO_AC3,
1774         IWL_TX_FIFO_AC2,
1775         IWL_TX_FIFO_AC1,
1776         IWL_TX_FIFO_AC0,
1777         IWL_CMD_FIFO_NUM,
1778         IWL_TX_FIFO_HCCA_1,
1779         IWL_TX_FIFO_HCCA_2
1780 };
1781
1782 static inline void iwl4965_txq_ctx_activate(struct iwl_priv *priv, int txq_id)
1783 {
1784         set_bit(txq_id, &priv->txq_ctx_active_msk);
1785 }
1786
1787 static inline void iwl4965_txq_ctx_deactivate(struct iwl_priv *priv, int txq_id)
1788 {
1789         clear_bit(txq_id, &priv->txq_ctx_active_msk);
1790 }
1791
1792 int iwl4965_alive_notify(struct iwl_priv *priv)
1793 {
1794         u32 a;
1795         int i = 0;
1796         unsigned long flags;
1797         int ret;
1798
1799         spin_lock_irqsave(&priv->lock, flags);
1800
1801 #ifdef CONFIG_IWL4965_SENSITIVITY
1802         memset(&(priv->sensitivity_data), 0,
1803                sizeof(struct iwl4965_sensitivity_data));
1804         memset(&(priv->chain_noise_data), 0,
1805                sizeof(struct iwl4965_chain_noise_data));
1806         for (i = 0; i < NUM_RX_CHAINS; i++)
1807                 priv->chain_noise_data.delta_gain_code[i] =
1808                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
1809 #endif /* CONFIG_IWL4965_SENSITIVITY*/
1810         ret = iwl4965_grab_nic_access(priv);
1811         if (ret) {
1812                 spin_unlock_irqrestore(&priv->lock, flags);
1813                 return ret;
1814         }
1815
1816         /* Clear 4965's internal Tx Scheduler data base */
1817         priv->scd_base_addr = iwl4965_read_prph(priv, KDR_SCD_SRAM_BASE_ADDR);
1818         a = priv->scd_base_addr + SCD_CONTEXT_DATA_OFFSET;
1819         for (; a < priv->scd_base_addr + SCD_TX_STTS_BITMAP_OFFSET; a += 4)
1820                 iwl4965_write_targ_mem(priv, a, 0);
1821         for (; a < priv->scd_base_addr + SCD_TRANSLATE_TBL_OFFSET; a += 4)
1822                 iwl4965_write_targ_mem(priv, a, 0);
1823         for (; a < sizeof(u16) * priv->hw_setting.max_txq_num; a += 4)
1824                 iwl4965_write_targ_mem(priv, a, 0);
1825
1826         /* Tel 4965 where to find Tx byte count tables */
1827         iwl4965_write_prph(priv, KDR_SCD_DRAM_BASE_ADDR,
1828                 (priv->hw_setting.shared_phys +
1829                  offsetof(struct iwl4965_shared, queues_byte_cnt_tbls)) >> 10);
1830
1831         /* Disable chain mode for all queues */
1832         iwl4965_write_prph(priv, KDR_SCD_QUEUECHAIN_SEL, 0);
1833
1834         /* Initialize each Tx queue (including the command queue) */
1835         for (i = 0; i < priv->hw_setting.max_txq_num; i++) {
1836
1837                 /* TFD circular buffer read/write indexes */
1838                 iwl4965_write_prph(priv, KDR_SCD_QUEUE_RDPTR(i), 0);
1839                 iwl4965_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));
1840
1841                 /* Max Tx Window size for Scheduler-ACK mode */
1842                 iwl4965_write_targ_mem(priv, priv->scd_base_addr +
1843                                         SCD_CONTEXT_QUEUE_OFFSET(i),
1844                                         (SCD_WIN_SIZE <<
1845                                         SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
1846                                         SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);
1847
1848                 /* Frame limit */
1849                 iwl4965_write_targ_mem(priv, priv->scd_base_addr +
1850                                         SCD_CONTEXT_QUEUE_OFFSET(i) +
1851                                         sizeof(u32),
1852                                         (SCD_FRAME_LIMIT <<
1853                                         SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
1854                                         SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);
1855
1856         }
1857         iwl4965_write_prph(priv, KDR_SCD_INTERRUPT_MASK,
1858                                  (1 << priv->hw_setting.max_txq_num) - 1);
1859
1860         /* Activate all Tx DMA/FIFO channels */
1861         iwl4965_write_prph(priv, KDR_SCD_TXFACT,
1862                                  SCD_TXFACT_REG_TXFIFO_MASK(0, 7));
1863
1864         iwl4965_set_wr_ptrs(priv, IWL_CMD_QUEUE_NUM, 0);
1865
1866         /* Map each Tx/cmd queue to its corresponding fifo */
1867         for (i = 0; i < ARRAY_SIZE(default_queue_to_tx_fifo); i++) {
1868                 int ac = default_queue_to_tx_fifo[i];
1869                 iwl4965_txq_ctx_activate(priv, i);
1870                 iwl4965_tx_queue_set_status(priv, &priv->txq[i], ac, 0);
1871         }
1872
1873         iwl4965_release_nic_access(priv);
1874         spin_unlock_irqrestore(&priv->lock, flags);
1875
1876         return ret;
1877 }
1878
1879 /**
1880  * iwl4965_hw_set_hw_setting
1881  *
1882  * Called when initializing driver
1883  */
1884 int iwl4965_hw_set_hw_setting(struct iwl_priv *priv)
1885 {
1886         int ret = 0;
1887
1888         if ((priv->cfg->mod_params->num_of_queues > IWL_MAX_NUM_QUEUES) ||
1889             (priv->cfg->mod_params->num_of_queues < IWL_MIN_NUM_QUEUES)) {
1890                 IWL_ERROR("invalid queues_num, should be between %d and %d\n",
1891                           IWL_MIN_NUM_QUEUES, IWL_MAX_NUM_QUEUES);
1892                 ret = -EINVAL;
1893                 goto out;
1894         }
1895
1896         /* Allocate area for Tx byte count tables and Rx queue status */
1897         priv->hw_setting.shared_virt =
1898             pci_alloc_consistent(priv->pci_dev,
1899                                  sizeof(struct iwl4965_shared),
1900                                  &priv->hw_setting.shared_phys);
1901
1902         if (!priv->hw_setting.shared_virt) {
1903                 ret = -ENOMEM;
1904                 goto out;
1905         }
1906
1907         memset(priv->hw_setting.shared_virt, 0, sizeof(struct iwl4965_shared));
1908
1909         priv->hw_setting.max_txq_num = priv->cfg->mod_params->num_of_queues;
1910         priv->hw_setting.tx_cmd_len = sizeof(struct iwl4965_tx_cmd);
1911         priv->hw_setting.max_rxq_size = RX_QUEUE_SIZE;
1912         priv->hw_setting.max_rxq_log = RX_QUEUE_SIZE_LOG;
1913         if (priv->cfg->mod_params->amsdu_size_8K)
1914                 priv->hw_setting.rx_buf_size = IWL_RX_BUF_SIZE_8K;
1915         else
1916                 priv->hw_setting.rx_buf_size = IWL_RX_BUF_SIZE_4K;
1917         priv->hw_setting.max_pkt_size = priv->hw_setting.rx_buf_size - 256;
1918         priv->hw_setting.max_stations = IWL4965_STATION_COUNT;
1919         priv->hw_setting.bcast_sta_id = IWL4965_BROADCAST_ID;
1920
1921         priv->hw_setting.tx_ant_num = 2;
1922
1923 out:
1924         return ret;
1925 }
1926
1927 /**
1928  * iwl4965_hw_txq_ctx_free - Free TXQ Context
1929  *
1930  * Destroy all TX DMA queues and structures
1931  */
1932 void iwl4965_hw_txq_ctx_free(struct iwl_priv *priv)
1933 {
1934         int txq_id;
1935
1936         /* Tx queues */
1937         for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++)
1938                 iwl4965_tx_queue_free(priv, &priv->txq[txq_id]);
1939
1940         /* Keep-warm buffer */
1941         iwl4965_kw_free(priv);
1942 }
1943
1944 /**
1945  * iwl4965_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
1946  *
1947  * Does NOT advance any TFD circular buffer read/write indexes
1948  * Does NOT free the TFD itself (which is within circular buffer)
1949  */
1950 int iwl4965_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl4965_tx_queue *txq)
1951 {
1952         struct iwl4965_tfd_frame *bd_tmp = (struct iwl4965_tfd_frame *)&txq->bd[0];
1953         struct iwl4965_tfd_frame *bd = &bd_tmp[txq->q.read_ptr];
1954         struct pci_dev *dev = priv->pci_dev;
1955         int i;
1956         int counter = 0;
1957         int index, is_odd;
1958
1959         /* Host command buffers stay mapped in memory, nothing to clean */
1960         if (txq->q.id == IWL_CMD_QUEUE_NUM)
1961                 return 0;
1962
1963         /* Sanity check on number of chunks */
1964         counter = IWL_GET_BITS(*bd, num_tbs);
1965         if (counter > MAX_NUM_OF_TBS) {
1966                 IWL_ERROR("Too many chunks: %i\n", counter);
1967                 /* @todo issue fatal error, it is quite serious situation */
1968                 return 0;
1969         }
1970
1971         /* Unmap chunks, if any.
1972          * TFD info for odd chunks is different format than for even chunks. */
1973         for (i = 0; i < counter; i++) {
1974                 index = i / 2;
1975                 is_odd = i & 0x1;
1976
1977                 if (is_odd)
1978                         pci_unmap_single(
1979                                 dev,
1980                                 IWL_GET_BITS(bd->pa[index], tb2_addr_lo16) |
1981                                 (IWL_GET_BITS(bd->pa[index],
1982                                               tb2_addr_hi20) << 16),
1983                                 IWL_GET_BITS(bd->pa[index], tb2_len),
1984                                 PCI_DMA_TODEVICE);
1985
1986                 else if (i > 0)
1987                         pci_unmap_single(dev,
1988                                          le32_to_cpu(bd->pa[index].tb1_addr),
1989                                          IWL_GET_BITS(bd->pa[index], tb1_len),
1990                                          PCI_DMA_TODEVICE);
1991
1992                 /* Free SKB, if any, for this chunk */
1993                 if (txq->txb[txq->q.read_ptr].skb[i]) {
1994                         struct sk_buff *skb = txq->txb[txq->q.read_ptr].skb[i];
1995
1996                         dev_kfree_skb(skb);
1997                         txq->txb[txq->q.read_ptr].skb[i] = NULL;
1998                 }
1999         }
2000         return 0;
2001 }
2002
2003 int iwl4965_hw_reg_set_txpower(struct iwl_priv *priv, s8 power)
2004 {
2005         IWL_ERROR("TODO: Implement iwl4965_hw_reg_set_txpower!\n");
2006         return -EINVAL;
2007 }
2008
2009 static s32 iwl4965_math_div_round(s32 num, s32 denom, s32 *res)
2010 {
2011         s32 sign = 1;
2012
2013         if (num < 0) {
2014                 sign = -sign;
2015                 num = -num;
2016         }
2017         if (denom < 0) {
2018                 sign = -sign;
2019                 denom = -denom;
2020         }
2021         *res = 1;
2022         *res = ((num * 2 + denom) / (denom * 2)) * sign;
2023
2024         return 1;
2025 }
2026
2027 /**
2028  * iwl4965_get_voltage_compensation - Power supply voltage comp for txpower
2029  *
2030  * Determines power supply voltage compensation for txpower calculations.
2031  * Returns number of 1/2-dB steps to subtract from gain table index,
2032  * to compensate for difference between power supply voltage during
2033  * factory measurements, vs. current power supply voltage.
2034  *
2035  * Voltage indication is higher for lower voltage.
2036  * Lower voltage requires more gain (lower gain table index).
2037  */
2038 static s32 iwl4965_get_voltage_compensation(s32 eeprom_voltage,
2039                                             s32 current_voltage)
2040 {
2041         s32 comp = 0;
2042
2043         if ((TX_POWER_IWL_ILLEGAL_VOLTAGE == eeprom_voltage) ||
2044             (TX_POWER_IWL_ILLEGAL_VOLTAGE == current_voltage))
2045                 return 0;
2046
2047         iwl4965_math_div_round(current_voltage - eeprom_voltage,
2048                                TX_POWER_IWL_VOLTAGE_CODES_PER_03V, &comp);
2049
2050         if (current_voltage > eeprom_voltage)
2051                 comp *= 2;
2052         if ((comp < -2) || (comp > 2))
2053                 comp = 0;
2054
2055         return comp;
2056 }
2057
2058 static const struct iwl_channel_info *
2059 iwl4965_get_channel_txpower_info(struct iwl_priv *priv,
2060                                  enum ieee80211_band band, u16 channel)
2061 {
2062         const struct iwl_channel_info *ch_info;
2063
2064         ch_info = iwl_get_channel_info(priv, band, channel);
2065
2066         if (!is_channel_valid(ch_info))
2067                 return NULL;
2068
2069         return ch_info;
2070 }
2071
2072 static s32 iwl4965_get_tx_atten_grp(u16 channel)
2073 {
2074         if (channel >= CALIB_IWL_TX_ATTEN_GR5_FCH &&
2075             channel <= CALIB_IWL_TX_ATTEN_GR5_LCH)
2076                 return CALIB_CH_GROUP_5;
2077
2078         if (channel >= CALIB_IWL_TX_ATTEN_GR1_FCH &&
2079             channel <= CALIB_IWL_TX_ATTEN_GR1_LCH)
2080                 return CALIB_CH_GROUP_1;
2081
2082         if (channel >= CALIB_IWL_TX_ATTEN_GR2_FCH &&
2083             channel <= CALIB_IWL_TX_ATTEN_GR2_LCH)
2084                 return CALIB_CH_GROUP_2;
2085
2086         if (channel >= CALIB_IWL_TX_ATTEN_GR3_FCH &&
2087             channel <= CALIB_IWL_TX_ATTEN_GR3_LCH)
2088                 return CALIB_CH_GROUP_3;
2089
2090         if (channel >= CALIB_IWL_TX_ATTEN_GR4_FCH &&
2091             channel <= CALIB_IWL_TX_ATTEN_GR4_LCH)
2092                 return CALIB_CH_GROUP_4;
2093
2094         IWL_ERROR("Can't find txatten group for channel %d.\n", channel);
2095         return -1;
2096 }
2097
2098 static u32 iwl4965_get_sub_band(const struct iwl_priv *priv, u32 channel)
2099 {
2100         s32 b = -1;
2101
2102         for (b = 0; b < EEPROM_TX_POWER_BANDS; b++) {
2103                 if (priv->eeprom.calib_info.band_info[b].ch_from == 0)
2104                         continue;
2105
2106                 if ((channel >= priv->eeprom.calib_info.band_info[b].ch_from)
2107                     && (channel <= priv->eeprom.calib_info.band_info[b].ch_to))
2108                         break;
2109         }
2110
2111         return b;
2112 }
2113
2114 static s32 iwl4965_interpolate_value(s32 x, s32 x1, s32 y1, s32 x2, s32 y2)
2115 {
2116         s32 val;
2117
2118         if (x2 == x1)
2119                 return y1;
2120         else {
2121                 iwl4965_math_div_round((x2 - x) * (y1 - y2), (x2 - x1), &val);
2122                 return val + y2;
2123         }
2124 }
2125
2126 /**
2127  * iwl4965_interpolate_chan - Interpolate factory measurements for one channel
2128  *
2129  * Interpolates factory measurements from the two sample channels within a
2130  * sub-band, to apply to channel of interest.  Interpolation is proportional to
2131  * differences in channel frequencies, which is proportional to differences
2132  * in channel number.
2133  */
2134 static int iwl4965_interpolate_chan(struct iwl_priv *priv, u32 channel,
2135                                     struct iwl4965_eeprom_calib_ch_info *chan_info)
2136 {
2137         s32 s = -1;
2138         u32 c;
2139         u32 m;
2140         const struct iwl4965_eeprom_calib_measure *m1;
2141         const struct iwl4965_eeprom_calib_measure *m2;
2142         struct iwl4965_eeprom_calib_measure *omeas;
2143         u32 ch_i1;
2144         u32 ch_i2;
2145
2146         s = iwl4965_get_sub_band(priv, channel);
2147         if (s >= EEPROM_TX_POWER_BANDS) {
2148                 IWL_ERROR("Tx Power can not find channel %d ", channel);
2149                 return -1;
2150         }
2151
2152         ch_i1 = priv->eeprom.calib_info.band_info[s].ch1.ch_num;
2153         ch_i2 = priv->eeprom.calib_info.band_info[s].ch2.ch_num;
2154         chan_info->ch_num = (u8) channel;
2155
2156         IWL_DEBUG_TXPOWER("channel %d subband %d factory cal ch %d & %d\n",
2157                           channel, s, ch_i1, ch_i2);
2158
2159         for (c = 0; c < EEPROM_TX_POWER_TX_CHAINS; c++) {
2160                 for (m = 0; m < EEPROM_TX_POWER_MEASUREMENTS; m++) {
2161                         m1 = &(priv->eeprom.calib_info.band_info[s].ch1.
2162                                measurements[c][m]);
2163                         m2 = &(priv->eeprom.calib_info.band_info[s].ch2.
2164                                measurements[c][m]);
2165                         omeas = &(chan_info->measurements[c][m]);
2166
2167                         omeas->actual_pow =
2168                             (u8) iwl4965_interpolate_value(channel, ch_i1,
2169                                                            m1->actual_pow,
2170                                                            ch_i2,
2171                                                            m2->actual_pow);
2172                         omeas->gain_idx =
2173                             (u8) iwl4965_interpolate_value(channel, ch_i1,
2174                                                            m1->gain_idx, ch_i2,
2175                                                            m2->gain_idx);
2176                         omeas->temperature =
2177                             (u8) iwl4965_interpolate_value(channel, ch_i1,
2178                                                            m1->temperature,
2179                                                            ch_i2,
2180                                                            m2->temperature);
2181                         omeas->pa_det =
2182                             (s8) iwl4965_interpolate_value(channel, ch_i1,
2183                                                            m1->pa_det, ch_i2,
2184                                                            m2->pa_det);
2185
2186                         IWL_DEBUG_TXPOWER
2187                             ("chain %d meas %d AP1=%d AP2=%d AP=%d\n", c, m,
2188                              m1->actual_pow, m2->actual_pow, omeas->actual_pow);
2189                         IWL_DEBUG_TXPOWER
2190                             ("chain %d meas %d NI1=%d NI2=%d NI=%d\n", c, m,
2191                              m1->gain_idx, m2->gain_idx, omeas->gain_idx);
2192                         IWL_DEBUG_TXPOWER
2193                             ("chain %d meas %d PA1=%d PA2=%d PA=%d\n", c, m,
2194                              m1->pa_det, m2->pa_det, omeas->pa_det);
2195                         IWL_DEBUG_TXPOWER
2196                             ("chain %d meas %d  T1=%d  T2=%d  T=%d\n", c, m,
2197                              m1->temperature, m2->temperature,
2198                              omeas->temperature);
2199                 }
2200         }
2201
2202         return 0;
2203 }
2204
2205 /* bit-rate-dependent table to prevent Tx distortion, in half-dB units,
2206  * for OFDM 6, 12, 18, 24, 36, 48, 54, 60 MBit, and CCK all rates. */
2207 static s32 back_off_table[] = {
2208         10, 10, 10, 10, 10, 15, 17, 20, /* OFDM SISO 20 MHz */
2209         10, 10, 10, 10, 10, 15, 17, 20, /* OFDM MIMO 20 MHz */
2210         10, 10, 10, 10, 10, 15, 17, 20, /* OFDM SISO 40 MHz */
2211         10, 10, 10, 10, 10, 15, 17, 20, /* OFDM MIMO 40 MHz */
2212         10                      /* CCK */
2213 };
2214
2215 /* Thermal compensation values for txpower for various frequency ranges ...
2216  *   ratios from 3:1 to 4.5:1 of degrees (Celsius) per half-dB gain adjust */
2217 static struct iwl4965_txpower_comp_entry {
2218         s32 degrees_per_05db_a;
2219         s32 degrees_per_05db_a_denom;
2220 } tx_power_cmp_tble[CALIB_CH_GROUP_MAX] = {
2221         {9, 2},                 /* group 0 5.2, ch  34-43 */
2222         {4, 1},                 /* group 1 5.2, ch  44-70 */
2223         {4, 1},                 /* group 2 5.2, ch  71-124 */
2224         {4, 1},                 /* group 3 5.2, ch 125-200 */
2225         {3, 1}                  /* group 4 2.4, ch   all */
2226 };
2227
2228 static s32 get_min_power_index(s32 rate_power_index, u32 band)
2229 {
2230         if (!band) {
2231                 if ((rate_power_index & 7) <= 4)
2232                         return MIN_TX_GAIN_INDEX_52GHZ_EXT;
2233         }
2234         return MIN_TX_GAIN_INDEX;
2235 }
2236
2237 struct gain_entry {
2238         u8 dsp;
2239         u8 radio;
2240 };
2241
2242 static const struct gain_entry gain_table[2][108] = {
2243         /* 5.2GHz power gain index table */
2244         {
2245          {123, 0x3F},           /* highest txpower */
2246          {117, 0x3F},
2247          {110, 0x3F},
2248          {104, 0x3F},
2249          {98, 0x3F},
2250          {110, 0x3E},
2251          {104, 0x3E},
2252          {98, 0x3E},
2253          {110, 0x3D},
2254          {104, 0x3D},
2255          {98, 0x3D},
2256          {110, 0x3C},
2257          {104, 0x3C},
2258          {98, 0x3C},
2259          {110, 0x3B},
2260          {104, 0x3B},
2261          {98, 0x3B},
2262          {110, 0x3A},
2263          {104, 0x3A},
2264          {98, 0x3A},
2265          {110, 0x39},
2266          {104, 0x39},
2267          {98, 0x39},
2268          {110, 0x38},
2269          {104, 0x38},
2270          {98, 0x38},
2271          {110, 0x37},
2272          {104, 0x37},
2273          {98, 0x37},
2274          {110, 0x36},
2275          {104, 0x36},
2276          {98, 0x36},
2277          {110, 0x35},
2278          {104, 0x35},
2279          {98, 0x35},
2280          {110, 0x34},
2281          {104, 0x34},
2282          {98, 0x34},
2283          {110, 0x33},
2284          {104, 0x33},
2285          {98, 0x33},
2286          {110, 0x32},
2287          {104, 0x32},
2288          {98, 0x32},
2289          {110, 0x31},
2290          {104, 0x31},
2291          {98, 0x31},
2292          {110, 0x30},
2293          {104, 0x30},
2294          {98, 0x30},
2295          {110, 0x25},
2296          {104, 0x25},
2297          {98, 0x25},
2298          {110, 0x24},
2299          {104, 0x24},
2300          {98, 0x24},
2301          {110, 0x23},
2302          {104, 0x23},
2303          {98, 0x23},
2304          {110, 0x22},
2305          {104, 0x18},
2306          {98, 0x18},
2307          {110, 0x17},
2308          {104, 0x17},
2309          {98, 0x17},
2310          {110, 0x16},
2311          {104, 0x16},
2312          {98, 0x16},
2313          {110, 0x15},
2314          {104, 0x15},
2315          {98, 0x15},
2316          {110, 0x14},
2317          {104, 0x14},
2318          {98, 0x14},
2319          {110, 0x13},
2320          {104, 0x13},
2321          {98, 0x13},
2322          {110, 0x12},
2323          {104, 0x08},
2324          {98, 0x08},
2325          {110, 0x07},
2326          {104, 0x07},
2327          {98, 0x07},
2328          {110, 0x06},
2329          {104, 0x06},
2330          {98, 0x06},
2331          {110, 0x05},
2332          {104, 0x05},
2333          {98, 0x05},
2334          {110, 0x04},
2335          {104, 0x04},
2336          {98, 0x04},
2337          {110, 0x03},
2338          {104, 0x03},
2339          {98, 0x03},
2340          {110, 0x02},
2341          {104, 0x02},
2342          {98, 0x02},
2343          {110, 0x01},
2344          {104, 0x01},
2345          {98, 0x01},
2346          {110, 0x00},
2347          {104, 0x00},
2348          {98, 0x00},
2349          {93, 0x00},
2350          {88, 0x00},
2351          {83, 0x00},
2352          {78, 0x00},
2353          },
2354         /* 2.4GHz power gain index table */
2355         {
2356          {110, 0x3f},           /* highest txpower */
2357          {104, 0x3f},
2358          {98, 0x3f},
2359          {110, 0x3e},
2360          {104, 0x3e},
2361          {98, 0x3e},
2362          {110, 0x3d},
2363          {104, 0x3d},
2364          {98, 0x3d},
2365          {110, 0x3c},
2366          {104, 0x3c},
2367          {98, 0x3c},
2368          {110, 0x3b},
2369          {104, 0x3b},
2370          {98, 0x3b},
2371          {110, 0x3a},
2372          {104, 0x3a},
2373          {98, 0x3a},
2374          {110, 0x39},
2375          {104, 0x39},
2376          {98, 0x39},
2377          {110, 0x38},
2378          {104, 0x38},
2379          {98, 0x38},
2380          {110, 0x37},
2381          {104, 0x37},
2382          {98, 0x37},
2383          {110, 0x36},
2384          {104, 0x36},
2385          {98, 0x36},
2386          {110, 0x35},
2387          {104, 0x35},
2388          {98, 0x35},
2389          {110, 0x34},
2390          {104, 0x34},
2391          {98, 0x34},
2392          {110, 0x33},
2393          {104, 0x33},
2394          {98, 0x33},
2395          {110, 0x32},
2396          {104, 0x32},
2397          {98, 0x32},
2398          {110, 0x31},
2399          {104, 0x31},
2400          {98, 0x31},
2401          {110, 0x30},
2402          {104, 0x30},
2403          {98, 0x30},
2404          {110, 0x6},
2405          {104, 0x6},
2406          {98, 0x6},
2407          {110, 0x5},
2408          {104, 0x5},
2409          {98, 0x5},
2410          {110, 0x4},
2411          {104, 0x4},
2412          {98, 0x4},
2413          {110, 0x3},
2414          {104, 0x3},
2415          {98, 0x3},
2416          {110, 0x2},
2417          {104, 0x2},
2418          {98, 0x2},
2419          {110, 0x1},
2420          {104, 0x1},
2421          {98, 0x1},
2422          {110, 0x0},
2423          {104, 0x0},
2424          {98, 0x0},
2425          {97, 0},
2426          {96, 0},
2427          {95, 0},
2428          {94, 0},
2429          {93, 0},
2430          {92, 0},
2431          {91, 0},
2432          {90, 0},
2433          {89, 0},
2434          {88, 0},
2435          {87, 0},
2436          {86, 0},
2437          {85, 0},
2438          {84, 0},
2439          {83, 0},
2440          {82, 0},
2441          {81, 0},
2442          {80, 0},
2443          {79, 0},
2444          {78, 0},
2445          {77, 0},
2446          {76, 0},
2447          {75, 0},
2448          {74, 0},
2449          {73, 0},
2450          {72, 0},
2451          {71, 0},
2452          {70, 0},
2453          {69, 0},
2454          {68, 0},
2455          {67, 0},
2456          {66, 0},
2457          {65, 0},
2458          {64, 0},
2459          {63, 0},
2460          {62, 0},
2461          {61, 0},
2462          {60, 0},
2463          {59, 0},
2464          }
2465 };
2466
2467 static int iwl4965_fill_txpower_tbl(struct iwl_priv *priv, u8 band, u16 channel,
2468                                     u8 is_fat, u8 ctrl_chan_high,
2469                                     struct iwl4965_tx_power_db *tx_power_tbl)
2470 {
2471         u8 saturation_power;
2472         s32 target_power;
2473         s32 user_target_power;
2474         s32 power_limit;
2475         s32 current_temp;
2476         s32 reg_limit;
2477         s32 current_regulatory;
2478         s32 txatten_grp = CALIB_CH_GROUP_MAX;
2479         int i;
2480         int c;
2481         const struct iwl_channel_info *ch_info = NULL;
2482         struct iwl4965_eeprom_calib_ch_info ch_eeprom_info;
2483         const struct iwl4965_eeprom_calib_measure *measurement;
2484         s16 voltage;
2485         s32 init_voltage;
2486         s32 voltage_compensation;
2487         s32 degrees_per_05db_num;
2488         s32 degrees_per_05db_denom;
2489         s32 factory_temp;
2490         s32 temperature_comp[2];
2491         s32 factory_gain_index[2];
2492         s32 factory_actual_pwr[2];
2493         s32 power_index;
2494
2495         /* Sanity check requested level (dBm) */
2496         if (priv->user_txpower_limit < IWL_TX_POWER_TARGET_POWER_MIN) {
2497                 IWL_WARNING("Requested user TXPOWER %d below limit.\n",
2498                             priv->user_txpower_limit);
2499                 return -EINVAL;
2500         }
2501         if (priv->user_txpower_limit > IWL_TX_POWER_TARGET_POWER_MAX) {
2502                 IWL_WARNING("Requested user TXPOWER %d above limit.\n",
2503                             priv->user_txpower_limit);
2504                 return -EINVAL;
2505         }
2506
2507         /* user_txpower_limit is in dBm, convert to half-dBm (half-dB units
2508          *   are used for indexing into txpower table) */
2509         user_target_power = 2 * priv->user_txpower_limit;
2510
2511         /* Get current (RXON) channel, band, width */
2512         ch_info =
2513                 iwl4965_get_channel_txpower_info(priv, priv->band, channel);
2514
2515         IWL_DEBUG_TXPOWER("chan %d band %d is_fat %d\n", channel, band,
2516                           is_fat);
2517
2518         if (!ch_info)
2519                 return -EINVAL;
2520
2521         /* get txatten group, used to select 1) thermal txpower adjustment
2522          *   and 2) mimo txpower balance between Tx chains. */
2523         txatten_grp = iwl4965_get_tx_atten_grp(channel);
2524         if (txatten_grp < 0)
2525                 return -EINVAL;
2526
2527         IWL_DEBUG_TXPOWER("channel %d belongs to txatten group %d\n",
2528                           channel, txatten_grp);
2529
2530         if (is_fat) {
2531                 if (ctrl_chan_high)
2532                         channel -= 2;
2533                 else
2534                         channel += 2;
2535         }
2536
2537         /* hardware txpower limits ...
2538          * saturation (clipping distortion) txpowers are in half-dBm */
2539         if (band)
2540                 saturation_power = priv->eeprom.calib_info.saturation_power24;
2541         else
2542                 saturation_power = priv->eeprom.calib_info.saturation_power52;
2543
2544         if (saturation_power < IWL_TX_POWER_SATURATION_MIN ||
2545             saturation_power > IWL_TX_POWER_SATURATION_MAX) {
2546                 if (band)
2547                         saturation_power = IWL_TX_POWER_DEFAULT_SATURATION_24;
2548                 else
2549                         saturation_power = IWL_TX_POWER_DEFAULT_SATURATION_52;
2550         }
2551
2552         /* regulatory txpower limits ... reg_limit values are in half-dBm,
2553          *   max_power_avg values are in dBm, convert * 2 */
2554         if (is_fat)
2555                 reg_limit = ch_info->fat_max_power_avg * 2;
2556         else
2557                 reg_limit = ch_info->max_power_avg * 2;
2558
2559         if ((reg_limit < IWL_TX_POWER_REGULATORY_MIN) ||
2560             (reg_limit > IWL_TX_POWER_REGULATORY_MAX)) {
2561                 if (band)
2562                         reg_limit = IWL_TX_POWER_DEFAULT_REGULATORY_24;
2563                 else
2564                         reg_limit = IWL_TX_POWER_DEFAULT_REGULATORY_52;
2565         }
2566
2567         /* Interpolate txpower calibration values for this channel,
2568          *   based on factory calibration tests on spaced channels. */
2569         iwl4965_interpolate_chan(priv, channel, &ch_eeprom_info);
2570
2571         /* calculate tx gain adjustment based on power supply voltage */
2572         voltage = priv->eeprom.calib_info.voltage;
2573         init_voltage = (s32)le32_to_cpu(priv->card_alive_init.voltage);
2574         voltage_compensation =
2575             iwl4965_get_voltage_compensation(voltage, init_voltage);
2576
2577         IWL_DEBUG_TXPOWER("curr volt %d eeprom volt %d volt comp %d\n",
2578                           init_voltage,
2579                           voltage, voltage_compensation);
2580
2581         /* get current temperature (Celsius) */
2582         current_temp = max(priv->temperature, IWL_TX_POWER_TEMPERATURE_MIN);
2583         current_temp = min(priv->temperature, IWL_TX_POWER_TEMPERATURE_MAX);
2584         current_temp = KELVIN_TO_CELSIUS(current_temp);
2585
2586         /* select thermal txpower adjustment params, based on channel group
2587          *   (same frequency group used for mimo txatten adjustment) */
2588         degrees_per_05db_num =
2589             tx_power_cmp_tble[txatten_grp].degrees_per_05db_a;
2590         degrees_per_05db_denom =
2591             tx_power_cmp_tble[txatten_grp].degrees_per_05db_a_denom;
2592
2593         /* get per-chain txpower values from factory measurements */
2594         for (c = 0; c < 2; c++) {
2595                 measurement = &ch_eeprom_info.measurements[c][1];
2596
2597                 /* txgain adjustment (in half-dB steps) based on difference
2598                  *   between factory and current temperature */
2599                 factory_temp = measurement->temperature;
2600                 iwl4965_math_div_round((current_temp - factory_temp) *
2601                                        degrees_per_05db_denom,
2602                                        degrees_per_05db_num,
2603                                        &temperature_comp[c]);
2604
2605                 factory_gain_index[c] = measurement->gain_idx;
2606                 factory_actual_pwr[c] = measurement->actual_pow;
2607
2608                 IWL_DEBUG_TXPOWER("chain = %d\n", c);
2609                 IWL_DEBUG_TXPOWER("fctry tmp %d, "
2610                                   "curr tmp %d, comp %d steps\n",
2611                                   factory_temp, current_temp,
2612                                   temperature_comp[c]);
2613
2614                 IWL_DEBUG_TXPOWER("fctry idx %d, fctry pwr %d\n",
2615                                   factory_gain_index[c],
2616                                   factory_actual_pwr[c]);
2617         }
2618
2619         /* for each of 33 bit-rates (including 1 for CCK) */
2620         for (i = 0; i < POWER_TABLE_NUM_ENTRIES; i++) {
2621                 u8 is_mimo_rate;
2622                 union iwl4965_tx_power_dual_stream tx_power;
2623
2624                 /* for mimo, reduce each chain's txpower by half
2625                  * (3dB, 6 steps), so total output power is regulatory
2626                  * compliant. */
2627                 if (i & 0x8) {
2628                         current_regulatory = reg_limit -
2629                             IWL_TX_POWER_MIMO_REGULATORY_COMPENSATION;
2630                         is_mimo_rate = 1;
2631                 } else {
2632                         current_regulatory = reg_limit;
2633                         is_mimo_rate = 0;
2634                 }
2635
2636                 /* find txpower limit, either hardware or regulatory */
2637                 power_limit = saturation_power - back_off_table[i];
2638                 if (power_limit > current_regulatory)
2639                         power_limit = current_regulatory;
2640
2641                 /* reduce user's txpower request if necessary
2642                  * for this rate on this channel */
2643                 target_power = user_target_power;
2644                 if (target_power > power_limit)
2645                         target_power = power_limit;
2646
2647                 IWL_DEBUG_TXPOWER("rate %d sat %d reg %d usr %d tgt %d\n",
2648                                   i, saturation_power - back_off_table[i],
2649                                   current_regulatory, user_target_power,
2650                                   target_power);
2651
2652                 /* for each of 2 Tx chains (radio transmitters) */
2653                 for (c = 0; c < 2; c++) {
2654                         s32 atten_value;
2655
2656                         if (is_mimo_rate)
2657                                 atten_value =
2658                                     (s32)le32_to_cpu(priv->card_alive_init.
2659                                     tx_atten[txatten_grp][c]);
2660                         else
2661                                 atten_value = 0;
2662
2663                         /* calculate index; higher index means lower txpower */
2664                         power_index = (u8) (factory_gain_index[c] -
2665                                             (target_power -
2666                                              factory_actual_pwr[c]) -
2667                                             temperature_comp[c] -
2668                                             voltage_compensation +
2669                                             atten_value);
2670
2671 /*                      IWL_DEBUG_TXPOWER("calculated txpower index %d\n",
2672                                                 power_index); */
2673
2674                         if (power_index < get_min_power_index(i, band))
2675                                 power_index = get_min_power_index(i, band);
2676
2677                         /* adjust 5 GHz index to support negative indexes */
2678                         if (!band)
2679                                 power_index += 9;
2680
2681                         /* CCK, rate 32, reduce txpower for CCK */
2682                         if (i == POWER_TABLE_CCK_ENTRY)
2683                                 power_index +=
2684                                     IWL_TX_POWER_CCK_COMPENSATION_C_STEP;
2685
2686                         /* stay within the table! */
2687                         if (power_index > 107) {
2688                                 IWL_WARNING("txpower index %d > 107\n",
2689                                             power_index);
2690                                 power_index = 107;
2691                         }
2692                         if (power_index < 0) {
2693                                 IWL_WARNING("txpower index %d < 0\n",
2694                                             power_index);
2695                                 power_index = 0;
2696                         }
2697
2698                         /* fill txpower command for this rate/chain */
2699                         tx_power.s.radio_tx_gain[c] =
2700                                 gain_table[band][power_index].radio;
2701                         tx_power.s.dsp_predis_atten[c] =
2702                                 gain_table[band][power_index].dsp;
2703
2704                         IWL_DEBUG_TXPOWER("chain %d mimo %d index %d "
2705                                           "gain 0x%02x dsp %d\n",
2706                                           c, atten_value, power_index,
2707                                         tx_power.s.radio_tx_gain[c],
2708                                         tx_power.s.dsp_predis_atten[c]);
2709                 }/* for each chain */
2710
2711                 tx_power_tbl->power_tbl[i].dw = cpu_to_le32(tx_power.dw);
2712
2713         }/* for each rate */
2714
2715         return 0;
2716 }
2717
2718 /**
2719  * iwl4965_hw_reg_send_txpower - Configure the TXPOWER level user limit
2720  *
2721  * Uses the active RXON for channel, band, and characteristics (fat, high)
2722  * The power limit is taken from priv->user_txpower_limit.
2723  */
2724 int iwl4965_hw_reg_send_txpower(struct iwl_priv *priv)
2725 {
2726         struct iwl4965_txpowertable_cmd cmd = { 0 };
2727         int ret;
2728         u8 band = 0;
2729         u8 is_fat = 0;
2730         u8 ctrl_chan_high = 0;
2731
2732         if (test_bit(STATUS_SCANNING, &priv->status)) {
2733                 /* If this gets hit a lot, switch it to a BUG() and catch
2734                  * the stack trace to find out who is calling this during
2735                  * a scan. */
2736                 IWL_WARNING("TX Power requested while scanning!\n");
2737                 return -EAGAIN;
2738         }
2739
2740         band = priv->band == IEEE80211_BAND_2GHZ;
2741
2742         is_fat =  is_fat_channel(priv->active_rxon.flags);
2743
2744         if (is_fat &&
2745             (priv->active_rxon.flags & RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK))
2746                 ctrl_chan_high = 1;
2747
2748         cmd.band = band;
2749         cmd.channel = priv->active_rxon.channel;
2750
2751         ret = iwl4965_fill_txpower_tbl(priv, band,
2752                                 le16_to_cpu(priv->active_rxon.channel),
2753                                 is_fat, ctrl_chan_high, &cmd.tx_power);
2754         if (ret)
2755                 goto out;
2756
2757         ret = iwl_send_cmd_pdu(priv, REPLY_TX_PWR_TABLE_CMD, sizeof(cmd), &cmd);
2758
2759 out:
2760         return ret;
2761 }
2762
2763 int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel)
2764 {
2765         int rc;
2766         u8 band = 0;
2767         u8 is_fat = 0;
2768         u8 ctrl_chan_high = 0;
2769         struct iwl4965_channel_switch_cmd cmd = { 0 };
2770         const struct iwl_channel_info *ch_info;
2771
2772         band = priv->band == IEEE80211_BAND_2GHZ;
2773
2774         ch_info = iwl_get_channel_info(priv, priv->band, channel);
2775
2776         is_fat = is_fat_channel(priv->staging_rxon.flags);
2777
2778         if (is_fat &&
2779             (priv->active_rxon.flags & RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK))
2780                 ctrl_chan_high = 1;
2781
2782         cmd.band = band;
2783         cmd.expect_beacon = 0;
2784         cmd.channel = cpu_to_le16(channel);
2785         cmd.rxon_flags = priv->active_rxon.flags;
2786         cmd.rxon_filter_flags = priv->active_rxon.filter_flags;
2787         cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
2788         if (ch_info)
2789                 cmd.expect_beacon = is_channel_radar(ch_info);
2790         else
2791                 cmd.expect_beacon = 1;
2792
2793         rc = iwl4965_fill_txpower_tbl(priv, band, channel, is_fat,
2794                                       ctrl_chan_high, &cmd.tx_power);
2795         if (rc) {
2796                 IWL_DEBUG_11H("error:%d  fill txpower_tbl\n", rc);
2797                 return rc;
2798         }
2799
2800         rc = iwl_send_cmd_pdu(priv, REPLY_CHANNEL_SWITCH, sizeof(cmd), &cmd);
2801         return rc;
2802 }
2803
2804 #define RTS_HCCA_RETRY_LIMIT            3
2805 #define RTS_DFAULT_RETRY_LIMIT          60
2806
2807 void iwl4965_hw_build_tx_cmd_rate(struct iwl_priv *priv,
2808                               struct iwl_cmd *cmd,
2809                               struct ieee80211_tx_control *ctrl,
2810                               struct ieee80211_hdr *hdr, int sta_id,
2811                               int is_hcca)
2812 {
2813         struct iwl4965_tx_cmd *tx = &cmd->cmd.tx;
2814         u8 rts_retry_limit = 0;
2815         u8 data_retry_limit = 0;
2816         u16 fc = le16_to_cpu(hdr->frame_control);
2817         u8 rate_plcp;
2818         u16 rate_flags = 0;
2819         int rate_idx = min(ctrl->tx_rate->hw_value & 0xffff, IWL_RATE_COUNT - 1);
2820
2821         rate_plcp = iwl4965_rates[rate_idx].plcp;
2822
2823         rts_retry_limit = (is_hcca) ?
2824             RTS_HCCA_RETRY_LIMIT : RTS_DFAULT_RETRY_LIMIT;
2825
2826         if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
2827                 rate_flags |= RATE_MCS_CCK_MSK;
2828
2829
2830         if (ieee80211_is_probe_response(fc)) {
2831                 data_retry_limit = 3;
2832                 if (data_retry_limit < rts_retry_limit)
2833                         rts_retry_limit = data_retry_limit;
2834         } else
2835                 data_retry_limit = IWL_DEFAULT_TX_RETRY;
2836
2837         if (priv->data_retry_limit != -1)
2838                 data_retry_limit = priv->data_retry_limit;
2839
2840
2841         if (ieee80211_is_data(fc)) {
2842                 tx->initial_rate_index = 0;
2843                 tx->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
2844         } else {
2845                 switch (fc & IEEE80211_FCTL_STYPE) {
2846                 case IEEE80211_STYPE_AUTH:
2847                 case IEEE80211_STYPE_DEAUTH:
2848                 case IEEE80211_STYPE_ASSOC_REQ:
2849                 case IEEE80211_STYPE_REASSOC_REQ:
2850                         if (tx->tx_flags & TX_CMD_FLG_RTS_MSK) {
2851                                 tx->tx_flags &= ~TX_CMD_FLG_RTS_MSK;
2852                                 tx->tx_flags |= TX_CMD_FLG_CTS_MSK;
2853                         }
2854                         break;
2855                 default:
2856                         break;
2857                 }
2858
2859                 /* Alternate between antenna A and B for successive frames */
2860                 if (priv->use_ant_b_for_management_frame) {
2861                         priv->use_ant_b_for_management_frame = 0;
2862                         rate_flags |= RATE_MCS_ANT_B_MSK;
2863                 } else {
2864                         priv->use_ant_b_for_management_frame = 1;
2865                         rate_flags |= RATE_MCS_ANT_A_MSK;
2866                 }
2867         }
2868
2869         tx->rts_retry_limit = rts_retry_limit;
2870         tx->data_retry_limit = data_retry_limit;
2871         tx->rate_n_flags = iwl4965_hw_set_rate_n_flags(rate_plcp, rate_flags);
2872 }
2873
2874 int iwl4965_hw_get_rx_read(struct iwl_priv *priv)
2875 {
2876         struct iwl4965_shared *shared_data = priv->hw_setting.shared_virt;
2877
2878         return IWL_GET_BITS(*shared_data, rb_closed_stts_rb_num);
2879 }
2880
2881 int iwl4965_hw_get_temperature(struct iwl_priv *priv)
2882 {
2883         return priv->temperature;
2884 }
2885
2886 unsigned int iwl4965_hw_get_beacon_cmd(struct iwl_priv *priv,
2887                           struct iwl4965_frame *frame, u8 rate)
2888 {
2889         struct iwl4965_tx_beacon_cmd *tx_beacon_cmd;
2890         unsigned int frame_size;
2891
2892         tx_beacon_cmd = &frame->u.beacon;
2893         memset(tx_beacon_cmd, 0, sizeof(*tx_beacon_cmd));
2894
2895         tx_beacon_cmd->tx.sta_id = priv->hw_setting.bcast_sta_id;
2896         tx_beacon_cmd->tx.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
2897
2898         frame_size = iwl4965_fill_beacon_frame(priv,
2899                                 tx_beacon_cmd->frame,
2900                                 iwl4965_broadcast_addr,
2901                                 sizeof(frame->u) - sizeof(*tx_beacon_cmd));
2902
2903         BUG_ON(frame_size > MAX_MPDU_SIZE);
2904         tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size);
2905
2906         if ((rate == IWL_RATE_1M_PLCP) || (rate >= IWL_RATE_2M_PLCP))
2907                 tx_beacon_cmd->tx.rate_n_flags =
2908                         iwl4965_hw_set_rate_n_flags(rate, RATE_MCS_CCK_MSK);
2909         else
2910                 tx_beacon_cmd->tx.rate_n_flags =
2911                         iwl4965_hw_set_rate_n_flags(rate, 0);
2912
2913         tx_beacon_cmd->tx.tx_flags = (TX_CMD_FLG_SEQ_CTL_MSK |
2914                                 TX_CMD_FLG_TSF_MSK | TX_CMD_FLG_STA_RATE_MSK);
2915         return (sizeof(*tx_beacon_cmd) + frame_size);
2916 }
2917
2918 /*
2919  * Tell 4965 where to find circular buffer of Tx Frame Descriptors for
2920  * given Tx queue, and enable the DMA channel used for that queue.
2921  *
2922  * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA
2923  * channels supported in hardware.
2924  */
2925 int iwl4965_hw_tx_queue_init(struct iwl_priv *priv, struct iwl4965_tx_queue *txq)
2926 {
2927         int rc;
2928         unsigned long flags;
2929         int txq_id = txq->q.id;
2930
2931         spin_lock_irqsave(&priv->lock, flags);
2932         rc = iwl4965_grab_nic_access(priv);
2933         if (rc) {
2934                 spin_unlock_irqrestore(&priv->lock, flags);
2935                 return rc;
2936         }
2937
2938         /* Circular buffer (TFD queue in DRAM) physical base address */
2939         iwl4965_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
2940                              txq->q.dma_addr >> 8);
2941
2942         /* Enable DMA channel, using same id as for TFD queue */
2943         iwl4965_write_direct32(
2944                 priv, IWL_FH_TCSR_CHNL_TX_CONFIG_REG(txq_id),
2945                 IWL_FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
2946                 IWL_FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL);
2947         iwl4965_release_nic_access(priv);
2948         spin_unlock_irqrestore(&priv->lock, flags);
2949
2950         return 0;
2951 }
2952
2953 int iwl4965_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv, void *ptr,
2954                                  dma_addr_t addr, u16 len)
2955 {
2956         int index, is_odd;
2957         struct iwl4965_tfd_frame *tfd = ptr;
2958         u32 num_tbs = IWL_GET_BITS(*tfd, num_tbs);
2959
2960         /* Each TFD can point to a maximum 20 Tx buffers */
2961         if ((num_tbs >= MAX_NUM_OF_TBS) || (num_tbs < 0)) {
2962                 IWL_ERROR("Error can not send more than %d chunks\n",
2963                           MAX_NUM_OF_TBS);
2964                 return -EINVAL;
2965         }
2966
2967         index = num_tbs / 2;
2968         is_odd = num_tbs & 0x1;
2969
2970         if (!is_odd) {
2971                 tfd->pa[index].tb1_addr = cpu_to_le32(addr);
2972                 IWL_SET_BITS(tfd->pa[index], tb1_addr_hi,
2973                              iwl_get_dma_hi_address(addr));
2974                 IWL_SET_BITS(tfd->pa[index], tb1_len, len);
2975         } else {
2976                 IWL_SET_BITS(tfd->pa[index], tb2_addr_lo16,
2977                              (u32) (addr & 0xffff));
2978                 IWL_SET_BITS(tfd->pa[index], tb2_addr_hi20, addr >> 16);
2979                 IWL_SET_BITS(tfd->pa[index], tb2_len, len);
2980         }
2981
2982         IWL_SET_BITS(*tfd, num_tbs, num_tbs + 1);
2983
2984         return 0;
2985 }
2986
2987 static void iwl4965_hw_card_show_info(struct iwl_priv *priv)
2988 {
2989         u16 hw_version = priv->eeprom.board_revision_4965;
2990
2991         IWL_DEBUG_INFO("4965ABGN HW Version %u.%u.%u\n",
2992                        ((hw_version >> 8) & 0x0F),
2993                        ((hw_version >> 8) >> 4), (hw_version & 0x00FF));
2994
2995         IWL_DEBUG_INFO("4965ABGN PBA Number %.16s\n",
2996                        priv->eeprom.board_pba_number_4965);
2997 }
2998
2999 #define IWL_TX_CRC_SIZE         4
3000 #define IWL_TX_DELIMITER_SIZE   4
3001
3002 /**
3003  * iwl4965_tx_queue_update_wr_ptr - Set up entry in Tx byte-count array
3004  */
3005 int iwl4965_tx_queue_update_wr_ptr(struct iwl_priv *priv,
3006                                    struct iwl4965_tx_queue *txq, u16 byte_cnt)
3007 {
3008         int len;
3009         int txq_id = txq->q.id;
3010         struct iwl4965_shared *shared_data = priv->hw_setting.shared_virt;
3011
3012         if (txq->need_update == 0)
3013                 return 0;
3014
3015         len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
3016
3017         /* Set up byte count within first 256 entries */
3018         IWL_SET_BITS16(shared_data->queues_byte_cnt_tbls[txq_id].
3019                        tfd_offset[txq->q.write_ptr], byte_cnt, len);
3020
3021         /* If within first 64 entries, duplicate at end */
3022         if (txq->q.write_ptr < IWL4965_MAX_WIN_SIZE)
3023                 IWL_SET_BITS16(shared_data->queues_byte_cnt_tbls[txq_id].
3024                         tfd_offset[IWL4965_QUEUE_SIZE + txq->q.write_ptr],
3025                         byte_cnt, len);
3026
3027         return 0;
3028 }
3029
3030 /**
3031  * iwl4965_set_rxon_chain - Set up Rx chain usage in "staging" RXON image
3032  *
3033  * Selects how many and which Rx receivers/antennas/chains to use.
3034  * This should not be used for scan command ... it puts data in wrong place.
3035  */
3036 void iwl4965_set_rxon_chain(struct iwl_priv *priv)
3037 {
3038         u8 is_single = is_single_stream(priv);
3039         u8 idle_state, rx_state;
3040
3041         priv->staging_rxon.rx_chain = 0;
3042         rx_state = idle_state = 3;
3043
3044         /* Tell uCode which antennas are actually connected.
3045          * Before first association, we assume all antennas are connected.
3046          * Just after first association, iwl4965_noise_calibration()
3047          *    checks which antennas actually *are* connected. */
3048         priv->staging_rxon.rx_chain |=
3049             cpu_to_le16(priv->valid_antenna << RXON_RX_CHAIN_VALID_POS);
3050
3051         /* How many receivers should we use? */
3052         iwl4965_get_rx_chain_counter(priv, &idle_state, &rx_state);
3053         priv->staging_rxon.rx_chain |=
3054                 cpu_to_le16(rx_state << RXON_RX_CHAIN_MIMO_CNT_POS);
3055         priv->staging_rxon.rx_chain |=
3056                 cpu_to_le16(idle_state << RXON_RX_CHAIN_CNT_POS);
3057
3058         if (!is_single && (rx_state >= 2) &&
3059             !test_bit(STATUS_POWER_PMI, &priv->status))
3060                 priv->staging_rxon.rx_chain |= RXON_RX_CHAIN_MIMO_FORCE_MSK;
3061         else
3062                 priv->staging_rxon.rx_chain &= ~RXON_RX_CHAIN_MIMO_FORCE_MSK;
3063
3064         IWL_DEBUG_ASSOC("rx chain %X\n", priv->staging_rxon.rx_chain);
3065 }
3066
3067 /**
3068  * sign_extend - Sign extend a value using specified bit as sign-bit
3069  *
3070  * Example: sign_extend(9, 3) would return -7 as bit3 of 1001b is 1
3071  * and bit0..2 is 001b which when sign extended to 1111111111111001b is -7.
3072  *
3073  * @param oper value to sign extend
3074  * @param index 0 based bit index (0<=index<32) to sign bit
3075  */
3076 static s32 sign_extend(u32 oper, int index)
3077 {
3078         u8 shift = 31 - index;
3079
3080         return (s32)(oper << shift) >> shift;
3081 }
3082
3083 /**
3084  * iwl4965_get_temperature - return the calibrated temperature (in Kelvin)
3085  * @statistics: Provides the temperature reading from the uCode
3086  *
3087  * A return of <0 indicates bogus data in the statistics
3088  */
3089 int iwl4965_get_temperature(const struct iwl_priv *priv)
3090 {
3091         s32 temperature;
3092         s32 vt;
3093         s32 R1, R2, R3;
3094         u32 R4;
3095
3096         if (test_bit(STATUS_TEMPERATURE, &priv->status) &&
3097                 (priv->statistics.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)) {
3098                 IWL_DEBUG_TEMP("Running FAT temperature calibration\n");
3099                 R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[1]);
3100                 R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[1]);
3101                 R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[1]);
3102                 R4 = le32_to_cpu(priv->card_alive_init.therm_r4[1]);
3103         } else {
3104                 IWL_DEBUG_TEMP("Running temperature calibration\n");
3105                 R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[0]);
3106                 R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[0]);
3107                 R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[0]);
3108                 R4 = le32_to_cpu(priv->card_alive_init.therm_r4[0]);
3109         }
3110
3111         /*
3112          * Temperature is only 23 bits, so sign extend out to 32.
3113          *
3114          * NOTE If we haven't received a statistics notification yet
3115          * with an updated temperature, use R4 provided to us in the
3116          * "initialize" ALIVE response.
3117          */
3118         if (!test_bit(STATUS_TEMPERATURE, &priv->status))
3119                 vt = sign_extend(R4, 23);
3120         else
3121                 vt = sign_extend(
3122                         le32_to_cpu(priv->statistics.general.temperature), 23);
3123
3124         IWL_DEBUG_TEMP("Calib values R[1-3]: %d %d %d R4: %d\n",
3125                        R1, R2, R3, vt);
3126
3127         if (R3 == R1) {
3128                 IWL_ERROR("Calibration conflict R1 == R3\n");
3129                 return -1;
3130         }
3131
3132         /* Calculate temperature in degrees Kelvin, adjust by 97%.
3133          * Add offset to center the adjustment around 0 degrees Centigrade. */
3134         temperature = TEMPERATURE_CALIB_A_VAL * (vt - R2);
3135         temperature /= (R3 - R1);
3136         temperature = (temperature * 97) / 100 +
3137             TEMPERATURE_CALIB_KELVIN_OFFSET;
3138
3139         IWL_DEBUG_TEMP("Calibrated temperature: %dK, %dC\n", temperature,
3140             KELVIN_TO_CELSIUS(temperature));
3141
3142         return temperature;
3143 }
3144
3145 /* Adjust Txpower only if temperature variance is greater than threshold. */
3146 #define IWL_TEMPERATURE_THRESHOLD   3
3147
3148 /**
3149  * iwl4965_is_temp_calib_needed - determines if new calibration is needed
3150  *
3151  * If the temperature changed has changed sufficiently, then a recalibration
3152  * is needed.
3153  *
3154  * Assumes caller will replace priv->last_temperature once calibration
3155  * executed.
3156  */
3157 static int iwl4965_is_temp_calib_needed(struct iwl_priv *priv)
3158 {
3159         int temp_diff;
3160
3161         if (!test_bit(STATUS_STATISTICS, &priv->status)) {
3162                 IWL_DEBUG_TEMP("Temperature not updated -- no statistics.\n");
3163                 return 0;
3164         }
3165
3166         temp_diff = priv->temperature - priv->last_temperature;
3167
3168         /* get absolute value */
3169         if (temp_diff < 0) {
3170                 IWL_DEBUG_POWER("Getting cooler, delta %d, \n", temp_diff);
3171                 temp_diff = -temp_diff;
3172         } else if (temp_diff == 0)
3173                 IWL_DEBUG_POWER("Same temp, \n");
3174         else
3175                 IWL_DEBUG_POWER("Getting warmer, delta %d, \n", temp_diff);
3176
3177         if (temp_diff < IWL_TEMPERATURE_THRESHOLD) {
3178                 IWL_DEBUG_POWER("Thermal txpower calib not needed\n");
3179                 return 0;
3180         }
3181
3182         IWL_DEBUG_POWER("Thermal txpower calib needed\n");
3183
3184         return 1;
3185 }
3186
3187 /* Calculate noise level, based on measurements during network silence just
3188  *   before arriving beacon.  This measurement can be done only if we know
3189  *   exactly when to expect beacons, therefore only when we're associated. */
3190 static void iwl4965_rx_calc_noise(struct iwl_priv *priv)
3191 {
3192         struct statistics_rx_non_phy *rx_info
3193                                 = &(priv->statistics.rx.general);
3194         int num_active_rx = 0;
3195         int total_silence = 0;
3196         int bcn_silence_a =
3197                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
3198         int bcn_silence_b =
3199                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
3200         int bcn_silence_c =
3201                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
3202
3203         if (bcn_silence_a) {
3204                 total_silence += bcn_silence_a;
3205                 num_active_rx++;
3206         }
3207         if (bcn_silence_b) {
3208                 total_silence += bcn_silence_b;
3209                 num_active_rx++;
3210         }
3211         if (bcn_silence_c) {
3212                 total_silence += bcn_silence_c;
3213                 num_active_rx++;
3214         }
3215
3216         /* Average among active antennas */
3217         if (num_active_rx)
3218                 priv->last_rx_noise = (total_silence / num_active_rx) - 107;
3219         else
3220                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
3221
3222         IWL_DEBUG_CALIB("inband silence a %u, b %u, c %u, dBm %d\n",
3223                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
3224                         priv->last_rx_noise);
3225 }
3226
3227 void iwl4965_hw_rx_statistics(struct iwl_priv *priv, struct iwl4965_rx_mem_buffer *rxb)
3228 {
3229         struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
3230         int change;
3231         s32 temp;
3232
3233         IWL_DEBUG_RX("Statistics notification received (%d vs %d).\n",
3234                      (int)sizeof(priv->statistics), pkt->len);
3235
3236         change = ((priv->statistics.general.temperature !=
3237                    pkt->u.stats.general.temperature) ||
3238                   ((priv->statistics.flag &
3239                     STATISTICS_REPLY_FLG_FAT_MODE_MSK) !=
3240                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK)));
3241
3242         memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
3243
3244         set_bit(STATUS_STATISTICS, &priv->status);
3245
3246         /* Reschedule the statistics timer to occur in
3247          * REG_RECALIB_PERIOD seconds to ensure we get a
3248          * thermal update even if the uCode doesn't give
3249          * us one */
3250         mod_timer(&priv->statistics_periodic, jiffies +
3251                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
3252
3253         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
3254             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
3255                 iwl4965_rx_calc_noise(priv);
3256 #ifdef CONFIG_IWL4965_SENSITIVITY
3257                 queue_work(priv->workqueue, &priv->sensitivity_work);
3258 #endif
3259         }
3260
3261         /* If the hardware hasn't reported a change in
3262          * temperature then don't bother computing a
3263          * calibrated temperature value */
3264         if (!change)
3265                 return;
3266
3267         temp = iwl4965_get_temperature(priv);
3268         if (temp < 0)
3269                 return;
3270
3271         if (priv->temperature != temp) {
3272                 if (priv->temperature)
3273                         IWL_DEBUG_TEMP("Temperature changed "
3274                                        "from %dC to %dC\n",
3275                                        KELVIN_TO_CELSIUS(priv->temperature),
3276                                        KELVIN_TO_CELSIUS(temp));
3277                 else
3278                         IWL_DEBUG_TEMP("Temperature "
3279                                        "initialized to %dC\n",
3280                                        KELVIN_TO_CELSIUS(temp));
3281         }
3282
3283         priv->temperature = temp;
3284         set_bit(STATUS_TEMPERATURE, &priv->status);
3285
3286         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
3287                      iwl4965_is_temp_calib_needed(priv))
3288                 queue_work(priv->workqueue, &priv->txpower_work);
3289 }
3290
3291 static void iwl4965_add_radiotap(struct iwl_priv *priv,
3292                                  struct sk_buff *skb,
3293                                  struct iwl4965_rx_phy_res *rx_start,
3294                                  struct ieee80211_rx_status *stats,
3295                                  u32 ampdu_status)
3296 {
3297         s8 signal = stats->ssi;
3298         s8 noise = 0;
3299         int rate = stats->rate_idx;
3300         u64 tsf = stats->mactime;
3301         __le16 phy_flags_hw = rx_start->phy_flags;
3302         struct iwl4965_rt_rx_hdr {
3303                 struct ieee80211_radiotap_header rt_hdr;
3304                 __le64 rt_tsf;          /* TSF */
3305                 u8 rt_flags;            /* radiotap packet flags */
3306                 u8 rt_rate;             /* rate in 500kb/s */
3307                 __le16 rt_channelMHz;   /* channel in MHz */
3308                 __le16 rt_chbitmask;    /* channel bitfield */
3309                 s8 rt_dbmsignal;        /* signal in dBm, kluged to signed */
3310                 s8 rt_dbmnoise;
3311                 u8 rt_antenna;          /* antenna number */
3312         } __attribute__ ((packed)) *iwl4965_rt;
3313
3314         /* TODO: We won't have enough headroom for HT frames. Fix it later. */
3315         if (skb_headroom(skb) < sizeof(*iwl4965_rt)) {
3316                 if (net_ratelimit())
3317                         printk(KERN_ERR "not enough headroom [%d] for "
3318                                "radiotap head [%zd]\n",
3319                                skb_headroom(skb), sizeof(*iwl4965_rt));
3320                 return;
3321         }
3322
3323         /* put radiotap header in front of 802.11 header and data */
3324         iwl4965_rt = (void *)skb_push(skb, sizeof(*iwl4965_rt));
3325
3326         /* initialise radiotap header */
3327         iwl4965_rt->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
3328         iwl4965_rt->rt_hdr.it_pad = 0;
3329
3330         /* total header + data */
3331         put_unaligned(cpu_to_le16(sizeof(*iwl4965_rt)),
3332                       &iwl4965_rt->rt_hdr.it_len);
3333
3334         /* Indicate all the fields we add to the radiotap header */
3335         put_unaligned(cpu_to_le32((1 << IEEE80211_RADIOTAP_TSFT) |
3336                                   (1 << IEEE80211_RADIOTAP_FLAGS) |
3337                                   (1 << IEEE80211_RADIOTAP_RATE) |
3338                                   (1 << IEEE80211_RADIOTAP_CHANNEL) |
3339                                   (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL) |
3340                                   (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE) |
3341                                   (1 << IEEE80211_RADIOTAP_ANTENNA)),
3342                       &iwl4965_rt->rt_hdr.it_present);
3343
3344         /* Zero the flags, we'll add to them as we go */
3345         iwl4965_rt->rt_flags = 0;
3346
3347         put_unaligned(cpu_to_le64(tsf), &iwl4965_rt->rt_tsf);
3348
3349         iwl4965_rt->rt_dbmsignal = signal;
3350         iwl4965_rt->rt_dbmnoise = noise;
3351
3352         /* Convert the channel frequency and set the flags */
3353         put_unaligned(cpu_to_le16(stats->freq), &iwl4965_rt->rt_channelMHz);
3354         if (!(phy_flags_hw & RX_RES_PHY_FLAGS_BAND_24_MSK))
3355                 put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
3356                                           IEEE80211_CHAN_5GHZ),
3357                               &iwl4965_rt->rt_chbitmask);
3358         else if (phy_flags_hw & RX_RES_PHY_FLAGS_MOD_CCK_MSK)
3359                 put_unaligned(cpu_to_le16(IEEE80211_CHAN_CCK |
3360                                           IEEE80211_CHAN_2GHZ),
3361                               &iwl4965_rt->rt_chbitmask);
3362         else    /* 802.11g */
3363                 put_unaligned(cpu_to_le16(IEEE80211_CHAN_OFDM |
3364                                           IEEE80211_CHAN_2GHZ),
3365                               &iwl4965_rt->rt_chbitmask);
3366
3367         if (rate == -1)
3368                 iwl4965_rt->rt_rate = 0;
3369         else
3370                 iwl4965_rt->rt_rate = iwl4965_rates[rate].ieee;
3371
3372         /*
3373          * "antenna number"
3374          *
3375          * It seems that the antenna field in the phy flags value
3376          * is actually a bitfield. This is undefined by radiotap,
3377          * it wants an actual antenna number but I always get "7"
3378          * for most legacy frames I receive indicating that the
3379          * same frame was received on all three RX chains.
3380          *
3381          * I think this field should be removed in favour of a
3382          * new 802.11n radiotap field "RX chains" that is defined
3383          * as a bitmask.
3384          */
3385         iwl4965_rt->rt_antenna =
3386                 le16_to_cpu(phy_flags_hw & RX_RES_PHY_FLAGS_ANTENNA_MSK) >> 4;
3387
3388         /* set the preamble flag if appropriate */
3389         if (phy_flags_hw & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
3390                 iwl4965_rt->rt_flags |= IEEE80211_RADIOTAP_F_SHORTPRE;
3391
3392         stats->flag |= RX_FLAG_RADIOTAP;
3393 }
3394
3395 static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
3396 {
3397         /* 0 - mgmt, 1 - cnt, 2 - data */
3398         int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
3399         priv->rx_stats[idx].cnt++;
3400         priv->rx_stats[idx].bytes += len;
3401 }
3402
3403 static u32 iwl4965_translate_rx_status(u32 decrypt_in)
3404 {
3405         u32 decrypt_out = 0;
3406
3407         if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
3408                                         RX_RES_STATUS_STATION_FOUND)
3409                 decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
3410                                 RX_RES_STATUS_NO_STATION_INFO_MISMATCH);
3411
3412         decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);
3413
3414         /* packet was not encrypted */
3415         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
3416                                         RX_RES_STATUS_SEC_TYPE_NONE)
3417                 return decrypt_out;
3418
3419         /* packet was encrypted with unknown alg */
3420         if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
3421                                         RX_RES_STATUS_SEC_TYPE_ERR)
3422                 return decrypt_out;
3423
3424         /* decryption was not done in HW */
3425         if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
3426                                         RX_MPDU_RES_STATUS_DEC_DONE_MSK)
3427                 return decrypt_out;
3428
3429         switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {
3430
3431         case RX_RES_STATUS_SEC_TYPE_CCMP:
3432                 /* alg is CCM: check MIC only */
3433                 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
3434                         /* Bad MIC */
3435                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
3436                 else
3437                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
3438
3439                 break;
3440
3441         case RX_RES_STATUS_SEC_TYPE_TKIP:
3442                 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
3443                         /* Bad TTAK */
3444                         decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
3445                         break;
3446                 }
3447                 /* fall through if TTAK OK */
3448         default:
3449                 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
3450                         decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
3451                 else
3452                         decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
3453                 break;
3454         };
3455
3456         IWL_DEBUG_RX("decrypt_in:0x%x  decrypt_out = 0x%x\n",
3457                                         decrypt_in, decrypt_out);
3458
3459         return decrypt_out;
3460 }
3461
3462 static void iwl4965_handle_data_packet(struct iwl_priv *priv, int is_data,
3463                                        int include_phy,
3464                                        struct iwl4965_rx_mem_buffer *rxb,
3465                                        struct ieee80211_rx_status *stats)
3466 {
3467         struct iwl4965_rx_packet *pkt = (struct iwl4965_rx_packet *)rxb->skb->data;
3468         struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
3469             (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) : NULL;
3470         struct ieee80211_hdr *hdr;
3471         u16 len;
3472         __le32 *rx_end;
3473         unsigned int skblen;
3474         u32 ampdu_status;
3475         u32 ampdu_status_legacy;
3476
3477         if (!include_phy && priv->last_phy_res[0])
3478                 rx_start = (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
3479
3480         if (!rx_start) {
3481                 IWL_ERROR("MPDU frame without a PHY data\n");
3482                 return;
3483         }
3484         if (include_phy) {
3485                 hdr = (struct ieee80211_hdr *)((u8 *) & rx_start[1] +
3486                                                rx_start->cfg_phy_cnt);
3487
3488                 len = le16_to_cpu(rx_start->byte_count);
3489
3490                 rx_end = (__le32 *) ((u8 *) & pkt->u.raw[0] +
3491                                   sizeof(struct iwl4965_rx_phy_res) +
3492                                   rx_start->cfg_phy_cnt + len);
3493
3494         } else {
3495                 struct iwl4965_rx_mpdu_res_start *amsdu =
3496                     (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
3497
3498                 hdr = (struct ieee80211_hdr *)(pkt->u.raw +
3499                                sizeof(struct iwl4965_rx_mpdu_res_start));
3500                 len =  le16_to_cpu(amsdu->byte_count);
3501                 rx_start->byte_count = amsdu->byte_count;
3502                 rx_end = (__le32 *) (((u8 *) hdr) + len);
3503         }
3504         if (len > priv->hw_setting.max_pkt_size || len < 16) {
3505                 IWL_WARNING("byte count out of range [16,4K] : %d\n", len);
3506                 return;
3507         }
3508
3509         ampdu_status = le32_to_cpu(*rx_end);
3510         skblen = ((u8 *) rx_end - (u8 *) & pkt->u.raw[0]) + sizeof(u32);
3511
3512         if (!include_phy) {
3513                 /* New status scheme, need to translate */
3514                 ampdu_status_legacy = ampdu_status;
3515                 ampdu_status = iwl4965_translate_rx_status(ampdu_status);
3516         }
3517
3518         /* start from MAC */
3519         skb_reserve(rxb->skb, (void *)hdr - (void *)pkt);
3520         skb_put(rxb->skb, len); /* end where data ends */
3521
3522         /* We only process data packets if the interface is open */
3523         if (unlikely(!priv->is_open)) {
3524                 IWL_DEBUG_DROP_LIMIT
3525                     ("Dropping packet while interface is not open.\n");
3526                 return;
3527         }
3528
3529         stats->flag = 0;
3530         hdr = (struct ieee80211_hdr *)rxb->skb->data;
3531
3532         if (priv->cfg->mod_params->hw_crypto)
3533                 iwl4965_set_decrypted_flag(priv, rxb->skb, ampdu_status, stats);
3534
3535         if (priv->add_radiotap)
3536                 iwl4965_add_radiotap(priv, rxb->skb, rx_start, stats, ampdu_status);
3537
3538         iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
3539         ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
3540         priv->alloc_rxb_skb--;
3541         rxb->skb = NULL;
3542 #ifdef LED
3543         priv->led_packets += len;
3544         iwl4965_setup_activity_timer(priv);
3545 #endif
3546 }
3547
3548 /* Calc max signal level (dBm) among 3 possible receivers */
3549 static int iwl4965_calc_rssi(struct iwl4965_rx_phy_res *rx_resp)
3550 {
3551         /* data from PHY/DSP regarding signal strength, etc.,
3552          *   contents are always there, not configurable by host.  */
3553         struct iwl4965_rx_non_cfg_phy *ncphy =
3554             (struct iwl4965_rx_non_cfg_phy *)rx_resp->non_cfg_phy;
3555         u32 agc = (le16_to_cpu(ncphy->agc_info) & IWL_AGC_DB_MASK)
3556                         >> IWL_AGC_DB_POS;
3557
3558         u32 valid_antennae =
3559             (le16_to_cpu(rx_resp->phy_flags) & RX_PHY_FLAGS_ANTENNAE_MASK)
3560                         >> RX_PHY_FLAGS_ANTENNAE_OFFSET;
3561         u8 max_rssi = 0;
3562         u32 i;
3563
3564         /* Find max rssi among 3 possible receivers.
3565          * These values are measured by the digital signal processor (DSP).
3566          * They should stay fairly constant even as the signal strength varies,
3567          *   if the radio's automatic gain control (AGC) is working right.
3568          * AGC value (see below) will provide the "interesting" info. */
3569         for (i = 0; i < 3; i++)
3570                 if (valid_antennae & (1 << i))
3571                         max_rssi = max(ncphy->rssi_info[i << 1], max_rssi);
3572
3573         IWL_DEBUG_STATS("Rssi In A %d B %d C %d Max %d AGC dB %d\n",
3574                 ncphy->rssi_info[0], ncphy->rssi_info[2], ncphy->rssi_info[4],
3575                 max_rssi, agc);
3576
3577         /* dBm = max_rssi dB - agc dB - constant.
3578          * Higher AGC (higher radio gain) means lower signal. */
3579         return (max_rssi - agc - IWL_RSSI_OFFSET);
3580 }
3581
3582 #ifdef CONFIG_IWL4965_HT
3583
3584 /* Parsed Information Elements */
3585 struct ieee802_11_elems {
3586         u8 *ds_params;
3587         u8 ds_params_len;
3588         u8 *tim;
3589         u8 tim_len;
3590         u8 *ibss_params;
3591         u8 ibss_params_len;
3592         u8 *erp_info;
3593         u8 erp_info_len;
3594         u8 *ht_cap_param;
3595         u8 ht_cap_param_len;
3596         u8 *ht_extra_param;
3597         u8 ht_extra_param_len;
3598 };
3599
3600 static int parse_elems(u8 *start, size_t len, struct ieee802_11_elems *elems)
3601 {
3602         size_t left = len;
3603         u8 *pos = start;
3604         int unknown = 0;
3605
3606         memset(elems, 0, sizeof(*elems));
3607
3608         while (left >= 2) {
3609                 u8 id, elen;
3610
3611                 id = *pos++;
3612                 elen = *pos++;
3613                 left -= 2;
3614
3615                 if (elen > left)
3616                         return -1;
3617
3618                 switch (id) {
3619                 case WLAN_EID_DS_PARAMS:
3620                         elems->ds_params = pos;
3621                         elems->ds_params_len = elen;
3622                         break;
3623                 case WLAN_EID_TIM:
3624                         elems->tim = pos;
3625                         elems->tim_len = elen;
3626                         break;
3627                 case WLAN_EID_IBSS_PARAMS:
3628                         elems->ibss_params = pos;
3629                         elems->ibss_params_len = elen;
3630                         break;
3631                 case WLAN_EID_ERP_INFO:
3632                         elems->erp_info = pos;
3633                         elems->erp_info_len = elen;
3634                         break;
3635                 case WLAN_EID_HT_CAPABILITY:
3636                         elems->ht_cap_param = pos;
3637                         elems->ht_cap_param_len = elen;
3638                         break;
3639                 case WLAN_EID_HT_EXTRA_INFO:
3640                         elems->ht_extra_param = pos;
3641                         elems->ht_extra_param_len = elen;
3642                         break;
3643                 default:
3644                         unknown++;
3645                         break;
3646                 }
3647
3648                 left -= elen;
3649                 pos += elen;
3650         }
3651
3652         return 0;
3653 }
3654
3655 void iwl4965_init_ht_hw_capab(struct iwl_priv *priv,
3656                               struct ieee80211_ht_info *ht_info,
3657                               enum ieee80211_band band)
3658 {
3659         ht_info->cap = 0;
3660         memset(ht_info->supp_mcs_set, 0, 16);
3661
3662         ht_info->ht_supported = 1;
3663
3664         if (band == IEEE80211_BAND_5GHZ) {
3665                 ht_info->cap |= (u16)IEEE80211_HT_CAP_SUP_WIDTH;
3666                 ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_40;
3667                 ht_info->supp_mcs_set[4] = 0x01;
3668         }
3669         ht_info->cap |= (u16)IEEE80211_HT_CAP_GRN_FLD;
3670         ht_info->cap |= (u16)IEEE80211_HT_CAP_SGI_20;
3671         ht_info->cap |= (u16)(IEEE80211_HT_CAP_MIMO_PS &
3672                              (IWL_MIMO_PS_NONE << 2));
3673
3674         if (priv->cfg->mod_params->amsdu_size_8K)
3675                 ht_info->cap |= (u16)IEEE80211_HT_CAP_MAX_AMSDU;
3676
3677         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
3678         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
3679
3680         ht_info->supp_mcs_set[0] = 0xFF;
3681         ht_info->supp_mcs_set[1] = 0xFF;
3682 }
3683 #endif /* CONFIG_IWL4965_HT */
3684
3685 static void iwl4965_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
3686 {
3687         unsigned long flags;
3688
3689         spin_lock_irqsave(&priv->sta_lock, flags);
3690         priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
3691         priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
3692         priv->stations[sta_id].sta.sta.modify_mask = 0;
3693         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
3694         spin_unlock_irqrestore(&priv->sta_lock, flags);
3695
3696         iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
3697 }
3698
3699 static void iwl4965_update_ps_mode(struct iwl_priv *priv, u16 ps_bit, u8 *addr)
3700 {
3701         /* FIXME: need locking over ps_status ??? */
3702         u8 sta_id = iwl4965_hw_find_station(priv, addr);
3703
3704         if (sta_id != IWL_INVALID_STATION) {
3705                 u8 sta_awake = priv->stations[sta_id].
3706                                 ps_status == STA_PS_STATUS_WAKE;
3707
3708                 if (sta_awake && ps_bit)
3709                         priv->stations[sta_id].ps_status = STA_PS_STATUS_SLEEP;
3710                 else if (!sta_awake && !ps_bit) {
3711                         iwl4965_sta_modify_ps_wake(priv, sta_id);
3712                         priv->stations[sta_id].ps_status = STA_PS_STATUS_WAKE;
3713                 }
3714         }
3715 }
3716 #ifdef CONFIG_IWLWIFI_DEBUG
3717
3718 /**
3719  * iwl4965_dbg_report_frame - dump frame to syslog during debug sessions
3720  *
3721  * You may hack this function to show different aspects of received frames,
3722  * including selective frame dumps.
3723  * group100 parameter selects whether to show 1 out of 100 good frames.
3724  *
3725  * TODO:  This was originally written for 3945, need to audit for
3726  *        proper operation with 4965.
3727  */
3728 static void iwl4965_dbg_report_frame(struct iwl_priv *priv,
3729                       struct iwl4965_rx_packet *pkt,
3730                       struct ieee80211_hdr *header, int group100)
3731 {
3732         u32 to_us;
3733         u32 print_summary = 0;
3734         u32 print_dump = 0;     /* set to 1 to dump all frames' contents */
3735         u32 hundred = 0;
3736         u32 dataframe = 0;
3737         u16 fc;
3738         u16 seq_ctl;
3739         u16 channel;
3740         u16 phy_flags;
3741         int rate_sym;
3742         u16 length;
3743         u16 status;
3744         u16 bcn_tmr;
3745         u32 tsf_low;
3746         u64 tsf;
3747         u8 rssi;
3748         u8 agc;
3749         u16 sig_avg;
3750         u16 noise_diff;
3751         struct iwl4965_rx_frame_stats *rx_stats = IWL_RX_STATS(pkt);
3752         struct iwl4965_rx_frame_hdr *rx_hdr = IWL_RX_HDR(pkt);
3753         struct iwl4965_rx_frame_end *rx_end = IWL_RX_END(pkt);
3754         u8 *data = IWL_RX_DATA(pkt);
3755
3756         if (likely(!(iwl_debug_level & IWL_DL_RX)))
3757                 return;
3758
3759         /* MAC header */
3760         fc = le16_to_cpu(header->frame_control);
3761         seq_ctl = le16_to_cpu(header->seq_ctrl);
3762
3763         /* metadata */
3764         channel = le16_to_cpu(rx_hdr->channel);
3765         phy_flags = le16_to_cpu(rx_hdr->phy_flags);
3766         rate_sym = rx_hdr->rate;
3767         length = le16_to_cpu(rx_hdr->len);
3768
3769         /* end-of-frame status and timestamp */
3770         status = le32_to_cpu(rx_end->status);
3771         bcn_tmr = le32_to_cpu(rx_end->beacon_timestamp);
3772         tsf_low = le64_to_cpu(rx_end->timestamp) & 0x0ffffffff;
3773         tsf = le64_to_cpu(rx_end->timestamp);
3774
3775         /* signal statistics */
3776         rssi = rx_stats->rssi;
3777         agc = rx_stats->agc;
3778         sig_avg = le16_to_cpu(rx_stats->sig_avg);
3779         noise_diff = le16_to_cpu(rx_stats->noise_diff);
3780
3781         to_us = !compare_ether_addr(header->addr1, priv->mac_addr);
3782
3783         /* if data frame is to us and all is good,
3784          *   (optionally) print summary for only 1 out of every 100 */
3785         if (to_us && (fc & ~IEEE80211_FCTL_PROTECTED) ==
3786             (IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) {
3787                 dataframe = 1;
3788                 if (!group100)
3789                         print_summary = 1;      /* print each frame */
3790                 else if (priv->framecnt_to_us < 100) {
3791                         priv->framecnt_to_us++;
3792                         print_summary = 0;
3793                 } else {
3794                         priv->framecnt_to_us = 0;
3795                         print_summary = 1;
3796                         hundred = 1;
3797                 }
3798         } else {
3799                 /* print summary for all other frames */
3800                 print_summary = 1;
3801         }
3802
3803         if (print_summary) {
3804                 char *title;
3805                 int rate_idx;
3806                 u32 bitrate;
3807
3808                 if (hundred)
3809                         title = "100Frames";
3810                 else if (fc & IEEE80211_FCTL_RETRY)
3811                         title = "Retry";
3812                 else if (ieee80211_is_assoc_response(fc))
3813                         title = "AscRsp";
3814                 else if (ieee80211_is_reassoc_response(fc))
3815                         title = "RasRsp";
3816                 else if (ieee80211_is_probe_response(fc)) {
3817                         title = "PrbRsp";
3818                         print_dump = 1; /* dump frame contents */
3819                 } else if (ieee80211_is_beacon(fc)) {
3820                         title = "Beacon";
3821                         print_dump = 1; /* dump frame contents */
3822                 } else if (ieee80211_is_atim(fc))
3823                         title = "ATIM";
3824                 else if (ieee80211_is_auth(fc))
3825                         title = "Auth";
3826                 else if (ieee80211_is_deauth(fc))
3827                         title = "DeAuth";
3828                 else if (ieee80211_is_disassoc(fc))
3829                         title = "DisAssoc";
3830                 else
3831                         title = "Frame";
3832
3833                 rate_idx = iwl4965_hwrate_to_plcp_idx(rate_sym);
3834                 if (unlikely(rate_idx == -1))
3835                         bitrate = 0;
3836                 else
3837                         bitrate = iwl4965_rates[rate_idx].ieee / 2;
3838
3839                 /* print frame summary.
3840                  * MAC addresses show just the last byte (for brevity),
3841                  *    but you can hack it to show more, if you'd like to. */
3842                 if (dataframe)
3843                         IWL_DEBUG_RX("%s: mhd=0x%04x, dst=0x%02x, "
3844                                      "len=%u, rssi=%d, chnl=%d, rate=%u, \n",
3845                                      title, fc, header->addr1[5],
3846                                      length, rssi, channel, bitrate);
3847                 else {
3848                         /* src/dst addresses assume managed mode */
3849                         IWL_DEBUG_RX("%s: 0x%04x, dst=0x%02x, "
3850                                      "src=0x%02x, rssi=%u, tim=%lu usec, "
3851                                      "phy=0x%02x, chnl=%d\n",
3852                                      title, fc, header->addr1[5],
3853                                      header->addr3[5], rssi,
3854                                      tsf_low - priv->scan_start_tsf,
3855                                      phy_flags, channel);
3856                 }
3857         }
3858         if (print_dump)
3859                 iwl_print_hex_dump(IWL_DL_RX, data, length);
3860 }
3861 #else
3862 static inline void iwl4965_dbg_report_frame(struct iwl_priv *priv,
3863                                             struct iwl4965_rx_packet *pkt,
3864                                             struct ieee80211_hdr *header,
3865                                             int group100)
3866 {
3867 }
3868 #endif
3869
3870
3871 #define IWL_DELAY_NEXT_SCAN_AFTER_ASSOC (HZ*6)
3872
3873 /* Called for REPLY_RX (legacy ABG frames), or
3874  * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
3875 static void iwl4965_rx_reply_rx(struct iwl_priv *priv,
3876                                 struct iwl4965_rx_mem_buffer *rxb)
3877 {
3878         struct ieee80211_hdr *header;
3879         struct ieee80211_rx_status rx_status;
3880         struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
3881         /* Use phy data (Rx signal strength, etc.) contained within
3882          *   this rx packet for legacy frames,
3883          *   or phy data cached from REPLY_RX_PHY_CMD for HT frames. */
3884         int include_phy = (pkt->hdr.cmd == REPLY_RX);
3885         struct iwl4965_rx_phy_res *rx_start = (include_phy) ?
3886                 (struct iwl4965_rx_phy_res *)&(pkt->u.raw[0]) :
3887                 (struct iwl4965_rx_phy_res *)&priv->last_phy_res[1];
3888         __le32 *rx_end;
3889         unsigned int len = 0;
3890         u16 fc;
3891         u8 network_packet;
3892
3893         rx_status.mactime = le64_to_cpu(rx_start->timestamp);
3894         rx_status.freq = ieee80211chan2mhz(le16_to_cpu(rx_start->channel));
3895         rx_status.band = (rx_start->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
3896                                 IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
3897         rx_status.rate_idx = iwl4965_hwrate_to_plcp_idx(
3898                                         le32_to_cpu(rx_start->rate_n_flags));
3899
3900         if (rx_status.band == IEEE80211_BAND_5GHZ)
3901                 rx_status.rate_idx -= IWL_FIRST_OFDM_RATE;
3902
3903         rx_status.antenna = 0;
3904         rx_status.flag = 0;
3905
3906         if ((unlikely(rx_start->cfg_phy_cnt > 20))) {
3907                 IWL_DEBUG_DROP
3908                         ("dsp size out of range [0,20]: "
3909                          "%d/n", rx_start->cfg_phy_cnt);
3910                 return;
3911         }
3912
3913         if (!include_phy) {
3914                 if (priv->last_phy_res[0])
3915                         rx_start = (struct iwl4965_rx_phy_res *)
3916                                 &priv->last_phy_res[1];
3917                 else
3918                         rx_start = NULL;
3919         }
3920
3921         if (!rx_start) {
3922                 IWL_ERROR("MPDU frame without a PHY data\n");
3923                 return;
3924         }
3925
3926         if (include_phy) {
3927                 header = (struct ieee80211_hdr *)((u8 *) & rx_start[1]
3928                                                   + rx_start->cfg_phy_cnt);
3929
3930                 len = le16_to_cpu(rx_start->byte_count);
3931                 rx_end = (__le32 *)(pkt->u.raw + rx_start->cfg_phy_cnt +
3932                                   sizeof(struct iwl4965_rx_phy_res) + len);
3933         } else {
3934                 struct iwl4965_rx_mpdu_res_start *amsdu =
3935                         (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw;
3936
3937                 header = (void *)(pkt->u.raw +
3938                         sizeof(struct iwl4965_rx_mpdu_res_start));
3939                 len = le16_to_cpu(amsdu->byte_count);
3940                 rx_end = (__le32 *) (pkt->u.raw +
3941                         sizeof(struct iwl4965_rx_mpdu_res_start) + len);
3942         }
3943
3944         if (!(*rx_end & RX_RES_STATUS_NO_CRC32_ERROR) ||
3945             !(*rx_end & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
3946                 IWL_DEBUG_RX("Bad CRC or FIFO: 0x%08X.\n",
3947                                 le32_to_cpu(*rx_end));
3948                 return;
3949         }
3950
3951         priv->ucode_beacon_time = le32_to_cpu(rx_start->beacon_time_stamp);
3952
3953         /* Find max signal strength (dBm) among 3 antenna/receiver chains */
3954         rx_status.ssi = iwl4965_calc_rssi(rx_start);
3955
3956         /* Meaningful noise values are available only from beacon statistics,
3957          *   which are gathered only when associated, and indicate noise
3958          *   only for the associated network channel ...
3959          * Ignore these noise values while scanning (other channels) */
3960         if (iwl4965_is_associated(priv) &&
3961             !test_bit(STATUS_SCANNING, &priv->status)) {
3962                 rx_status.noise = priv->last_rx_noise;
3963                 rx_status.signal = iwl4965_calc_sig_qual(rx_status.ssi,
3964                                                          rx_status.noise);
3965         } else {
3966                 rx_status.noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
3967                 rx_status.signal = iwl4965_calc_sig_qual(rx_status.ssi, 0);
3968         }
3969
3970         /* Reset beacon noise level if not associated. */
3971         if (!iwl4965_is_associated(priv))
3972                 priv->last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
3973
3974         /* Set "1" to report good data frames in groups of 100 */
3975         /* FIXME: need to optimze the call: */
3976         iwl4965_dbg_report_frame(priv, pkt, header, 1);
3977
3978         IWL_DEBUG_STATS_LIMIT("Rssi %d, noise %d, qual %d, TSF %llu\n",
3979                               rx_status.ssi, rx_status.noise, rx_status.signal,
3980                               rx_status.mactime);
3981
3982         network_packet = iwl4965_is_network_packet(priv, header);
3983         if (network_packet) {
3984                 priv->last_rx_rssi = rx_status.ssi;
3985                 priv->last_beacon_time =  priv->ucode_beacon_time;
3986                 priv->last_tsf = le64_to_cpu(rx_start->timestamp);
3987         }
3988
3989         fc = le16_to_cpu(header->frame_control);
3990         switch (fc & IEEE80211_FCTL_FTYPE) {
3991         case IEEE80211_FTYPE_MGMT:
3992
3993                 if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
3994                         iwl4965_update_ps_mode(priv, fc  & IEEE80211_FCTL_PM,
3995                                                 header->addr2);
3996                 switch (fc & IEEE80211_FCTL_STYPE) {
3997                 case IEEE80211_STYPE_PROBE_RESP:
3998                 case IEEE80211_STYPE_BEACON:
3999                         if ((priv->iw_mode == IEEE80211_IF_TYPE_STA &&
4000                              !compare_ether_addr(header->addr2, priv->bssid)) ||
4001                             (priv->iw_mode == IEEE80211_IF_TYPE_IBSS &&
4002                              !compare_ether_addr(header->addr3, priv->bssid))) {
4003                                 struct ieee80211_mgmt *mgmt =
4004                                         (struct ieee80211_mgmt *)header;
4005                                 u64 timestamp =
4006                                         le64_to_cpu(mgmt->u.beacon.timestamp);
4007
4008                                 priv->timestamp0 = timestamp & 0xFFFFFFFF;
4009                                 priv->timestamp1 =
4010                                         (timestamp >> 32) & 0xFFFFFFFF;
4011                                 priv->beacon_int = le16_to_cpu(
4012                                     mgmt->u.beacon.beacon_int);
4013                                 if (priv->call_post_assoc_from_beacon &&
4014                                     (priv->iw_mode == IEEE80211_IF_TYPE_STA)) {
4015                                         priv->call_post_assoc_from_beacon = 0;
4016                                         queue_work(priv->workqueue,
4017                                             &priv->post_associate.work);
4018                                 }
4019                         }
4020                         break;
4021
4022                 case IEEE80211_STYPE_ACTION:
4023                         break;
4024
4025                         /*
4026                          * TODO: Use the new callback function from
4027                          * mac80211 instead of sniffing these packets.
4028                          */
4029                 case IEEE80211_STYPE_ASSOC_RESP:
4030                 case IEEE80211_STYPE_REASSOC_RESP:
4031                         if (network_packet) {
4032 #ifdef CONFIG_IWL4965_HT
4033                                 u8 *pos = NULL;
4034                                 struct ieee802_11_elems elems;
4035 #endif                          /*CONFIG_IWL4965_HT */
4036                                 struct ieee80211_mgmt *mgnt =
4037                                         (struct ieee80211_mgmt *)header;
4038
4039                                 /* We have just associated, give some
4040                                  * time for the 4-way handshake if
4041                                  * any. Don't start scan too early. */
4042                                 priv->next_scan_jiffies = jiffies +
4043                                         IWL_DELAY_NEXT_SCAN_AFTER_ASSOC;
4044
4045                                 priv->assoc_id = (~((1 << 15) | (1 << 14))
4046                                         & le16_to_cpu(mgnt->u.assoc_resp.aid));
4047                                 priv->assoc_capability =
4048                                         le16_to_cpu(
4049                                                 mgnt->u.assoc_resp.capab_info);
4050 #ifdef CONFIG_IWL4965_HT
4051                                 pos = mgnt->u.assoc_resp.variable;
4052                                 if (!parse_elems(pos,
4053                                                  len - (pos - (u8 *) mgnt),
4054                                                  &elems)) {
4055                                         if (elems.ht_extra_param &&
4056                                             elems.ht_cap_param)
4057                                                 break;
4058                                 }
4059 #endif                          /*CONFIG_IWL4965_HT */
4060                                 /* assoc_id is 0 no association */
4061                                 if (!priv->assoc_id)
4062                                         break;
4063                                 if (priv->beacon_int)
4064                                         queue_work(priv->workqueue,
4065                                             &priv->post_associate.work);
4066                                 else
4067                                         priv->call_post_assoc_from_beacon = 1;
4068                         }
4069
4070                         break;
4071
4072                 case IEEE80211_STYPE_PROBE_REQ:
4073                         if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
4074                             !iwl4965_is_associated(priv)) {
4075                                 DECLARE_MAC_BUF(mac1);
4076                                 DECLARE_MAC_BUF(mac2);
4077                                 DECLARE_MAC_BUF(mac3);
4078
4079                                 IWL_DEBUG_DROP("Dropping (non network): "
4080                                                "%s, %s, %s\n",
4081                                                print_mac(mac1, header->addr1),
4082                                                print_mac(mac2, header->addr2),
4083                                                print_mac(mac3, header->addr3));
4084                                 return;
4085                         }
4086                 }
4087                 iwl4965_handle_data_packet(priv, 0, include_phy, rxb, &rx_status);
4088                 break;
4089
4090         case IEEE80211_FTYPE_CTL:
4091 #ifdef CONFIG_IWL4965_HT
4092                 switch (fc & IEEE80211_FCTL_STYPE) {
4093                 case IEEE80211_STYPE_BACK_REQ:
4094                         IWL_DEBUG_HT("IEEE80211_STYPE_BACK_REQ arrived\n");
4095                         iwl4965_handle_data_packet(priv, 0, include_phy,
4096                                                 rxb, &rx_status);
4097                         break;
4098                 default:
4099                         break;
4100                 }
4101 #endif
4102                 break;
4103
4104         case IEEE80211_FTYPE_DATA: {
4105                 DECLARE_MAC_BUF(mac1);
4106                 DECLARE_MAC_BUF(mac2);
4107                 DECLARE_MAC_BUF(mac3);
4108
4109                 if (priv->iw_mode == IEEE80211_IF_TYPE_AP)
4110                         iwl4965_update_ps_mode(priv, fc  & IEEE80211_FCTL_PM,
4111                                                 header->addr2);
4112
4113                 if (unlikely(!network_packet))
4114                         IWL_DEBUG_DROP("Dropping (non network): "
4115                                        "%s, %s, %s\n",
4116                                        print_mac(mac1, header->addr1),
4117                                        print_mac(mac2, header->addr2),
4118                                        print_mac(mac3, header->addr3));
4119                 else if (unlikely(iwl4965_is_duplicate_packet(priv, header)))
4120                         IWL_DEBUG_DROP("Dropping (dup): %s, %s, %s\n",
4121                                        print_mac(mac1, header->addr1),
4122                                        print_mac(mac2, header->addr2),
4123                                        print_mac(mac3, header->addr3));
4124                 else
4125                         iwl4965_handle_data_packet(priv, 1, include_phy, rxb,
4126                                                    &rx_status);
4127                 break;
4128         }
4129         default:
4130                 break;
4131
4132         }
4133 }
4134
4135 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
4136  * This will be used later in iwl4965_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
4137 static void iwl4965_rx_reply_rx_phy(struct iwl_priv *priv,
4138                                     struct iwl4965_rx_mem_buffer *rxb)
4139 {
4140         struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
4141         priv->last_phy_res[0] = 1;
4142         memcpy(&priv->last_phy_res[1], &(pkt->u.raw[0]),
4143                sizeof(struct iwl4965_rx_phy_res));
4144 }
4145
4146 static void iwl4965_rx_missed_beacon_notif(struct iwl_priv *priv,
4147                                            struct iwl4965_rx_mem_buffer *rxb)
4148
4149 {
4150 #ifdef CONFIG_IWL4965_SENSITIVITY
4151         struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
4152         struct iwl4965_missed_beacon_notif *missed_beacon;
4153
4154         missed_beacon = &pkt->u.missed_beacon;
4155         if (le32_to_cpu(missed_beacon->consequtive_missed_beacons) > 5) {
4156                 IWL_DEBUG_CALIB("missed bcn cnsq %d totl %d rcd %d expctd %d\n",
4157                     le32_to_cpu(missed_beacon->consequtive_missed_beacons),
4158                     le32_to_cpu(missed_beacon->total_missed_becons),
4159                     le32_to_cpu(missed_beacon->num_recvd_beacons),
4160                     le32_to_cpu(missed_beacon->num_expected_beacons));
4161                 priv->sensitivity_data.state = IWL_SENS_CALIB_NEED_REINIT;
4162                 if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)))
4163                         queue_work(priv->workqueue, &priv->sensitivity_work);
4164         }
4165 #endif /*CONFIG_IWL4965_SENSITIVITY*/
4166 }
4167
4168 #ifdef CONFIG_IWL4965_HT
4169
4170 /**
4171  * iwl4965_sta_modify_enable_tid_tx - Enable Tx for this TID in station table
4172  */
4173 static void iwl4965_sta_modify_enable_tid_tx(struct iwl_priv *priv,
4174                                          int sta_id, int tid)
4175 {
4176         unsigned long flags;
4177
4178         /* Remove "disable" flag, to enable Tx for this TID */
4179         spin_lock_irqsave(&priv->sta_lock, flags);
4180         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
4181         priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
4182         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
4183         spin_unlock_irqrestore(&priv->sta_lock, flags);
4184
4185         iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
4186 }
4187
4188 /**
4189  * iwl4965_tx_status_reply_compressed_ba - Update tx status from block-ack
4190  *
4191  * Go through block-ack's bitmap of ACK'd frames, update driver's record of
4192  * ACK vs. not.  This gets sent to mac80211, then to rate scaling algo.
4193  */
4194 static int iwl4965_tx_status_reply_compressed_ba(struct iwl_priv *priv,
4195                                                  struct iwl4965_ht_agg *agg,
4196                                                  struct iwl4965_compressed_ba_resp*
4197                                                  ba_resp)
4198
4199 {
4200         int i, sh, ack;
4201         u16 seq_ctl = le16_to_cpu(ba_resp->seq_ctl);
4202         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
4203         u64 bitmap;
4204         int successes = 0;
4205         struct ieee80211_tx_status *tx_status;
4206
4207         if (unlikely(!agg->wait_for_ba))  {
4208                 IWL_ERROR("Received BA when not expected\n");
4209                 return -EINVAL;
4210         }
4211
4212         /* Mark that the expected block-ack response arrived */
4213         agg->wait_for_ba = 0;
4214         IWL_DEBUG_TX_REPLY("BA %d %d\n", agg->start_idx, ba_resp->seq_ctl);
4215
4216         /* Calculate shift to align block-ack bits with our Tx window bits */
4217         sh = agg->start_idx - SEQ_TO_INDEX(seq_ctl>>4);
4218         if (sh < 0) /* tbw something is wrong with indices */
4219                 sh += 0x100;
4220
4221         /* don't use 64-bit values for now */
4222         bitmap = le64_to_cpu(ba_resp->bitmap) >> sh;
4223
4224         if (agg->frame_count > (64 - sh)) {
4225                 IWL_DEBUG_TX_REPLY("more frames than bitmap size");
4226                 return -1;
4227         }
4228
4229         /* check for success or failure according to the
4230          * transmitted bitmap and block-ack bitmap */
4231         bitmap &= agg->bitmap;
4232
4233         /* For each frame attempted in aggregation,
4234          * update driver's record of tx frame's status. */
4235         for (i = 0; i < agg->frame_count ; i++) {
4236                 ack = bitmap & (1 << i);
4237                 successes += !!ack;
4238                 IWL_DEBUG_TX_REPLY("%s ON i=%d idx=%d raw=%d\n",
4239                         ack? "ACK":"NACK", i, (agg->start_idx + i) & 0xff,
4240                         agg->start_idx + i);
4241         }
4242
4243         tx_status = &priv->txq[scd_flow].txb[agg->start_idx].status;
4244         tx_status->flags = IEEE80211_TX_STATUS_ACK;
4245         tx_status->flags |= IEEE80211_TX_STATUS_AMPDU;
4246         tx_status->ampdu_ack_map = successes;
4247         tx_status->ampdu_ack_len = agg->frame_count;
4248         iwl4965_hwrate_to_tx_control(priv, agg->rate_n_flags,
4249                                      &tx_status->control);
4250
4251         IWL_DEBUG_TX_REPLY("Bitmap %llx\n", (unsigned long long)bitmap);
4252
4253         return 0;
4254 }
4255
4256 /**
4257  * iwl4965_tx_queue_stop_scheduler - Stop queue, but keep configuration
4258  */
4259 static void iwl4965_tx_queue_stop_scheduler(struct iwl_priv *priv,
4260                                             u16 txq_id)
4261 {
4262         /* Simply stop the queue, but don't change any configuration;
4263          * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
4264         iwl4965_write_prph(priv,
4265                 KDR_SCD_QUEUE_STATUS_BITS(txq_id),
4266                 (0 << SCD_QUEUE_STTS_REG_POS_ACTIVE)|
4267                 (1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
4268 }
4269
4270 /**
4271  * txq_id must be greater than IWL_BACK_QUEUE_FIRST_ID
4272  * priv->lock must be held by the caller
4273  */
4274 static int iwl4965_tx_queue_agg_disable(struct iwl_priv *priv, u16 txq_id,
4275                                         u16 ssn_idx, u8 tx_fifo)
4276 {
4277         int ret = 0;
4278
4279         if (IWL_BACK_QUEUE_FIRST_ID > txq_id) {
4280                 IWL_WARNING("queue number too small: %d, must be > %d\n",
4281                                 txq_id, IWL_BACK_QUEUE_FIRST_ID);
4282                 return -EINVAL;
4283         }
4284
4285         ret = iwl4965_grab_nic_access(priv);
4286         if (ret)
4287                 return ret;
4288
4289         iwl4965_tx_queue_stop_scheduler(priv, txq_id);
4290
4291         iwl4965_clear_bits_prph(priv, KDR_SCD_QUEUECHAIN_SEL, (1 << txq_id));
4292
4293         priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
4294         priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
4295         /* supposes that ssn_idx is valid (!= 0xFFF) */
4296         iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);
4297
4298         iwl4965_clear_bits_prph(priv, KDR_SCD_INTERRUPT_MASK, (1 << txq_id));
4299         iwl4965_txq_ctx_deactivate(priv, txq_id);
4300         iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);
4301
4302         iwl4965_release_nic_access(priv);
4303
4304         return 0;
4305 }
4306
4307 int iwl4965_check_empty_hw_queue(struct iwl_priv *priv, int sta_id,
4308                                          u8 tid, int txq_id)
4309 {
4310         struct iwl4965_queue *q = &priv->txq[txq_id].q;
4311         u8 *addr = priv->stations[sta_id].sta.sta.addr;
4312         struct iwl4965_tid_data *tid_data = &priv->stations[sta_id].tid[tid];
4313
4314         switch (priv->stations[sta_id].tid[tid].agg.state) {
4315         case IWL_EMPTYING_HW_QUEUE_DELBA:
4316                 /* We are reclaiming the last packet of the */
4317                 /* aggregated HW queue */
4318                 if (txq_id  == tid_data->agg.txq_id &&
4319                     q->read_ptr == q->write_ptr) {
4320                         u16 ssn = SEQ_TO_SN(tid_data->seq_number);
4321                         int tx_fifo = default_tid_to_tx_fifo[tid];
4322                         IWL_DEBUG_HT("HW queue empty: continue DELBA flow\n");
4323                         iwl4965_tx_queue_agg_disable(priv, txq_id,
4324                                                      ssn, tx_fifo);
4325                         tid_data->agg.state = IWL_AGG_OFF;
4326                         ieee80211_stop_tx_ba_cb_irqsafe(priv->hw, addr, tid);
4327                 }
4328                 break;
4329         case IWL_EMPTYING_HW_QUEUE_ADDBA:
4330                 /* We are reclaiming the last packet of the queue */
4331                 if (tid_data->tfds_in_queue == 0) {
4332                         IWL_DEBUG_HT("HW queue empty: continue ADDBA flow\n");
4333                         tid_data->agg.state = IWL_AGG_ON;
4334                         ieee80211_start_tx_ba_cb_irqsafe(priv->hw, addr, tid);
4335                 }
4336                 break;
4337         }
4338         return 0;
4339 }
4340
4341 /**
4342  * iwl4965_queue_dec_wrap - Decrement queue index, wrap back to end if needed
4343  * @index -- current index
4344  * @n_bd -- total number of entries in queue (s/b power of 2)
4345  */
4346 static inline int iwl4965_queue_dec_wrap(int index, int n_bd)
4347 {
4348         return (index == 0) ? n_bd - 1 : index - 1;
4349 }
4350
4351 /**
4352  * iwl4965_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
4353  *
4354  * Handles block-acknowledge notification from device, which reports success
4355  * of frames sent via aggregation.
4356  */
4357 static void iwl4965_rx_reply_compressed_ba(struct iwl_priv *priv,
4358                                            struct iwl4965_rx_mem_buffer *rxb)
4359 {
4360         struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
4361         struct iwl4965_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
4362         int index;
4363         struct iwl4965_tx_queue *txq = NULL;
4364         struct iwl4965_ht_agg *agg;
4365         DECLARE_MAC_BUF(mac);
4366
4367         /* "flow" corresponds to Tx queue */
4368         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
4369
4370         /* "ssn" is start of block-ack Tx window, corresponds to index
4371          * (in Tx queue's circular buffer) of first TFD/frame in window */
4372         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
4373
4374         if (scd_flow >= ARRAY_SIZE(priv->txq)) {
4375                 IWL_ERROR("BUG_ON scd_flow is bigger than number of queues");
4376                 return;
4377         }
4378
4379         txq = &priv->txq[scd_flow];
4380         agg = &priv->stations[ba_resp->sta_id].tid[ba_resp->tid].agg;
4381
4382         /* Find index just before block-ack window */
4383         index = iwl4965_queue_dec_wrap(ba_resp_scd_ssn & 0xff, txq->q.n_bd);
4384
4385         /* TODO: Need to get this copy more safely - now good for debug */
4386
4387         IWL_DEBUG_TX_REPLY("REPLY_COMPRESSED_BA [%d]Received from %s, "
4388                            "sta_id = %d\n",
4389                            agg->wait_for_ba,
4390                            print_mac(mac, (u8*) &ba_resp->sta_addr_lo32),
4391                            ba_resp->sta_id);
4392         IWL_DEBUG_TX_REPLY("TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = "
4393                            "%d, scd_ssn = %d\n",
4394                            ba_resp->tid,
4395                            ba_resp->seq_ctl,
4396                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
4397                            ba_resp->scd_flow,
4398                            ba_resp->scd_ssn);
4399         IWL_DEBUG_TX_REPLY("DAT start_idx = %d, bitmap = 0x%llx \n",
4400                            agg->start_idx,
4401                            (unsigned long long)agg->bitmap);
4402
4403         /* Update driver's record of ACK vs. not for each frame in window */
4404         iwl4965_tx_status_reply_compressed_ba(priv, agg, ba_resp);
4405
4406         /* Release all TFDs before the SSN, i.e. all TFDs in front of
4407          * block-ack window (we assume that they've been successfully
4408          * transmitted ... if not, it's too late anyway). */
4409         if (txq->q.read_ptr != (ba_resp_scd_ssn & 0xff)) {
4410                 int freed = iwl4965_tx_queue_reclaim(priv, scd_flow, index);
4411                 priv->stations[ba_resp->sta_id].
4412                         tid[ba_resp->tid].tfds_in_queue -= freed;
4413                 if (iwl4965_queue_space(&txq->q) > txq->q.low_mark &&
4414                         priv->mac80211_registered &&
4415                         agg->state != IWL_EMPTYING_HW_QUEUE_DELBA)
4416                         ieee80211_wake_queue(priv->hw, scd_flow);
4417                 iwl4965_check_empty_hw_queue(priv, ba_resp->sta_id,
4418                         ba_resp->tid, scd_flow);
4419         }
4420 }
4421
4422 /**
4423  * iwl4965_tx_queue_set_q2ratid - Map unique receiver/tid combination to a queue
4424  */
4425 static int iwl4965_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
4426                                         u16 txq_id)
4427 {
4428         u32 tbl_dw_addr;
4429         u32 tbl_dw;
4430         u16 scd_q2ratid;
4431
4432         scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK;
4433
4434         tbl_dw_addr = priv->scd_base_addr +
4435                         SCD_TRANSLATE_TBL_OFFSET_QUEUE(txq_id);
4436
4437         tbl_dw = iwl4965_read_targ_mem(priv, tbl_dw_addr);
4438
4439         if (txq_id & 0x1)
4440                 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
4441         else
4442                 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
4443
4444         iwl4965_write_targ_mem(priv, tbl_dw_addr, tbl_dw);
4445
4446         return 0;
4447 }
4448
4449
4450 /**
4451  * iwl4965_tx_queue_agg_enable - Set up & enable aggregation for selected queue
4452  *
4453  * NOTE:  txq_id must be greater than IWL_BACK_QUEUE_FIRST_ID,
4454  *        i.e. it must be one of the higher queues used for aggregation
4455  */
4456 static int iwl4965_tx_queue_agg_enable(struct iwl_priv *priv, int txq_id,
4457                                        int tx_fifo, int sta_id, int tid,
4458                                        u16 ssn_idx)
4459 {
4460         unsigned long flags;
4461         int rc;
4462         u16 ra_tid;
4463
4464         if (IWL_BACK_QUEUE_FIRST_ID > txq_id)
4465                 IWL_WARNING("queue number too small: %d, must be > %d\n",
4466                         txq_id, IWL_BACK_QUEUE_FIRST_ID);
4467
4468         ra_tid = BUILD_RAxTID(sta_id, tid);
4469
4470         /* Modify device's station table to Tx this TID */
4471         iwl4965_sta_modify_enable_tid_tx(priv, sta_id, tid);
4472
4473         spin_lock_irqsave(&priv->lock, flags);
4474         rc = iwl4965_grab_nic_access(priv);
4475         if (rc) {
4476                 spin_unlock_irqrestore(&priv->lock, flags);
4477                 return rc;
4478         }
4479
4480         /* Stop this Tx queue before configuring it */
4481         iwl4965_tx_queue_stop_scheduler(priv, txq_id);
4482
4483         /* Map receiver-address / traffic-ID to this queue */
4484         iwl4965_tx_queue_set_q2ratid(priv, ra_tid, txq_id);
4485
4486         /* Set this queue as a chain-building queue */
4487         iwl4965_set_bits_prph(priv, KDR_SCD_QUEUECHAIN_SEL, (1 << txq_id));
4488
4489         /* Place first TFD at index corresponding to start sequence number.
4490          * Assumes that ssn_idx is valid (!= 0xFFF) */
4491         priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
4492         priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
4493         iwl4965_set_wr_ptrs(priv, txq_id, ssn_idx);
4494
4495         /* Set up Tx window size and frame limit for this queue */
4496         iwl4965_write_targ_mem(priv,
4497                         priv->scd_base_addr + SCD_CONTEXT_QUEUE_OFFSET(txq_id),
4498                         (SCD_WIN_SIZE << SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
4499                         SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);
4500
4501         iwl4965_write_targ_mem(priv, priv->scd_base_addr +
4502                         SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
4503                         (SCD_FRAME_LIMIT << SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS)
4504                         & SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);
4505
4506         iwl4965_set_bits_prph(priv, KDR_SCD_INTERRUPT_MASK, (1 << txq_id));
4507
4508         /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
4509         iwl4965_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);
4510
4511         iwl4965_release_nic_access(priv);
4512         spin_unlock_irqrestore(&priv->lock, flags);
4513
4514         return 0;
4515 }
4516
4517 #endif /* CONFIG_IWL4965_HT */
4518
4519 /**
4520  * iwl4965_add_station - Initialize a station's hardware rate table
4521  *
4522  * The uCode's station table contains a table of fallback rates
4523  * for automatic fallback during transmission.
4524  *
4525  * NOTE: This sets up a default set of values.  These will be replaced later
4526  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
4527  *       rc80211_simple.
4528  *
4529  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
4530  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
4531  *       which requires station table entry to exist).
4532  */
4533 void iwl4965_add_station(struct iwl_priv *priv, const u8 *addr, int is_ap)
4534 {
4535         int i, r;
4536         struct iwl4965_link_quality_cmd link_cmd = {
4537                 .reserved1 = 0,
4538         };
4539         u16 rate_flags;
4540
4541         /* Set up the rate scaling to start at selected rate, fall back
4542          * all the way down to 1M in IEEE order, and then spin on 1M */
4543         if (is_ap)
4544                 r = IWL_RATE_54M_INDEX;
4545         else if (priv->band == IEEE80211_BAND_5GHZ)
4546                 r = IWL_RATE_6M_INDEX;
4547         else
4548                 r = IWL_RATE_1M_INDEX;
4549
4550         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
4551                 rate_flags = 0;
4552                 if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
4553                         rate_flags |= RATE_MCS_CCK_MSK;
4554
4555                 /* Use Tx antenna B only */
4556                 rate_flags |= RATE_MCS_ANT_B_MSK;
4557                 rate_flags &= ~RATE_MCS_ANT_A_MSK;
4558
4559                 link_cmd.rs_table[i].rate_n_flags =
4560                         iwl4965_hw_set_rate_n_flags(iwl4965_rates[r].plcp, rate_flags);
4561                 r = iwl4965_get_prev_ieee_rate(r);
4562         }
4563
4564         link_cmd.general_params.single_stream_ant_msk = 2;
4565         link_cmd.general_params.dual_stream_ant_msk = 3;
4566         link_cmd.agg_params.agg_dis_start_th = 3;
4567         link_cmd.agg_params.agg_time_limit = cpu_to_le16(4000);
4568
4569         /* Update the rate scaling for control frame Tx to AP */
4570         link_cmd.sta_id = is_ap ? IWL_AP_ID : priv->hw_setting.bcast_sta_id;
4571
4572         iwl_send_cmd_pdu(priv, REPLY_TX_LINK_QUALITY_CMD, sizeof(link_cmd),
4573                          &link_cmd);
4574 }
4575
4576 #ifdef CONFIG_IWL4965_HT
4577
4578 static u8 iwl4965_is_channel_extension(struct iwl_priv *priv,
4579                                        enum ieee80211_band band,
4580                                        u16 channel, u8 extension_chan_offset)
4581 {
4582         const struct iwl_channel_info *ch_info;
4583
4584         ch_info = iwl_get_channel_info(priv, band, channel);
4585         if (!is_channel_valid(ch_info))
4586                 return 0;
4587
4588         if (extension_chan_offset == IWL_EXT_CHANNEL_OFFSET_NONE)
4589                 return 0;
4590
4591         if ((ch_info->fat_extension_channel == extension_chan_offset) ||
4592             (ch_info->fat_extension_channel == HT_IE_EXT_CHANNEL_MAX))
4593                 return 1;
4594
4595         return 0;
4596 }
4597
4598 static u8 iwl4965_is_fat_tx_allowed(struct iwl_priv *priv,
4599                                 struct ieee80211_ht_info *sta_ht_inf)
4600 {
4601         struct iwl_ht_info *iwl_ht_conf = &priv->current_ht_config;
4602
4603         if ((!iwl_ht_conf->is_ht) ||
4604            (iwl_ht_conf->supported_chan_width != IWL_CHANNEL_WIDTH_40MHZ) ||
4605            (iwl_ht_conf->extension_chan_offset == IWL_EXT_CHANNEL_OFFSET_NONE))
4606                 return 0;
4607
4608         if (sta_ht_inf) {
4609                 if ((!sta_ht_inf->ht_supported) ||
4610                    (!(sta_ht_inf->cap & IEEE80211_HT_CAP_SUP_WIDTH)))
4611                         return 0;
4612         }
4613
4614         return (iwl4965_is_channel_extension(priv, priv->band,
4615                                          iwl_ht_conf->control_channel,
4616                                          iwl_ht_conf->extension_chan_offset));
4617 }
4618
4619 void iwl4965_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_info *ht_info)
4620 {
4621         struct iwl4965_rxon_cmd *rxon = &priv->staging_rxon;
4622         u32 val;
4623
4624         if (!ht_info->is_ht)
4625                 return;
4626
4627         /* Set up channel bandwidth:  20 MHz only, or 20/40 mixed if fat ok */
4628         if (iwl4965_is_fat_tx_allowed(priv, NULL))
4629                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED_MSK;
4630         else
4631                 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED_MSK |
4632                                  RXON_FLG_CHANNEL_MODE_PURE_40_MSK);
4633
4634         if (le16_to_cpu(rxon->channel) != ht_info->control_channel) {
4635                 IWL_DEBUG_ASSOC("control diff than current %d %d\n",
4636                                 le16_to_cpu(rxon->channel),
4637                                 ht_info->control_channel);
4638                 rxon->channel = cpu_to_le16(ht_info->control_channel);
4639                 return;
4640         }
4641
4642         /* Note: control channel is opposite of extension channel */
4643         switch (ht_info->extension_chan_offset) {
4644         case IWL_EXT_CHANNEL_OFFSET_ABOVE:
4645                 rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
4646                 break;
4647         case IWL_EXT_CHANNEL_OFFSET_BELOW:
4648                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
4649                 break;
4650         case IWL_EXT_CHANNEL_OFFSET_NONE:
4651         default:
4652                 rxon->flags &= ~RXON_FLG_CHANNEL_MODE_MIXED_MSK;
4653                 break;
4654         }
4655
4656         val = ht_info->ht_protection;
4657
4658         rxon->flags |= cpu_to_le32(val << RXON_FLG_HT_OPERATING_MODE_POS);
4659
4660         iwl4965_set_rxon_chain(priv);
4661
4662         IWL_DEBUG_ASSOC("supported HT rate 0x%X %X "
4663                         "rxon flags 0x%X operation mode :0x%X "
4664                         "extension channel offset 0x%x "
4665                         "control chan %d\n",
4666                         ht_info->supp_mcs_set[0], ht_info->supp_mcs_set[1],
4667                         le32_to_cpu(rxon->flags), ht_info->ht_protection,
4668                         ht_info->extension_chan_offset,
4669                         ht_info->control_channel);
4670         return;
4671 }
4672
4673 void iwl4965_set_ht_add_station(struct iwl_priv *priv, u8 index,
4674                                 struct ieee80211_ht_info *sta_ht_inf)
4675 {
4676         __le32 sta_flags;
4677         u8 mimo_ps_mode;
4678
4679         if (!sta_ht_inf || !sta_ht_inf->ht_supported)
4680                 goto done;
4681
4682         mimo_ps_mode = (sta_ht_inf->cap & IEEE80211_HT_CAP_MIMO_PS) >> 2;
4683
4684         sta_flags = priv->stations[index].sta.station_flags;
4685
4686         sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
4687
4688         switch (mimo_ps_mode) {
4689         case WLAN_HT_CAP_MIMO_PS_STATIC:
4690                 sta_flags |= STA_FLG_MIMO_DIS_MSK;
4691                 break;
4692         case WLAN_HT_CAP_MIMO_PS_DYNAMIC:
4693                 sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
4694                 break;
4695         case WLAN_HT_CAP_MIMO_PS_DISABLED:
4696                 break;
4697         default:
4698                 IWL_WARNING("Invalid MIMO PS mode %d", mimo_ps_mode);
4699                 break;
4700         }
4701
4702         sta_flags |= cpu_to_le32(
4703               (u32)sta_ht_inf->ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
4704
4705         sta_flags |= cpu_to_le32(
4706               (u32)sta_ht_inf->ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
4707
4708         if (iwl4965_is_fat_tx_allowed(priv, sta_ht_inf))
4709                 sta_flags |= STA_FLG_FAT_EN_MSK;
4710         else
4711                 sta_flags &= ~STA_FLG_FAT_EN_MSK;
4712
4713         priv->stations[index].sta.station_flags = sta_flags;
4714  done:
4715         return;
4716 }
4717
4718 static void iwl4965_sta_modify_add_ba_tid(struct iwl_priv *priv,
4719                                           int sta_id, int tid, u16 ssn)
4720 {
4721         unsigned long flags;
4722
4723         spin_lock_irqsave(&priv->sta_lock, flags);
4724         priv->stations[sta_id].sta.station_flags_msk = 0;
4725         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
4726         priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
4727         priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
4728         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
4729         spin_unlock_irqrestore(&priv->sta_lock, flags);
4730
4731         iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
4732 }
4733
4734 static void iwl4965_sta_modify_del_ba_tid(struct iwl_priv *priv,
4735                                           int sta_id, int tid)
4736 {
4737         unsigned long flags;
4738
4739         spin_lock_irqsave(&priv->sta_lock, flags);
4740         priv->stations[sta_id].sta.station_flags_msk = 0;
4741         priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
4742         priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
4743         priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
4744         spin_unlock_irqrestore(&priv->sta_lock, flags);
4745
4746         iwl4965_send_add_station(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
4747 }
4748
4749 /*
4750  * Find first available (lowest unused) Tx Queue, mark it "active".
4751  * Called only when finding queue for aggregation.
4752  * Should never return anything < 7, because they should already
4753  * be in use as EDCA AC (0-3), Command (4), HCCA (5, 6).
4754  */
4755 static int iwl4965_txq_ctx_activate_free(struct iwl_priv *priv)
4756 {
4757         int txq_id;
4758
4759         for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++)
4760                 if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk))
4761                         return txq_id;
4762         return -1;
4763 }
4764
4765 static int iwl4965_mac_ht_tx_agg_start(struct ieee80211_hw *hw, const u8 *da,
4766                                        u16 tid, u16 *start_seq_num)
4767 {
4768         struct iwl_priv *priv = hw->priv;
4769         int sta_id;
4770         int tx_fifo;
4771         int txq_id;
4772         int ssn = -1;
4773         int ret = 0;
4774         unsigned long flags;
4775         struct iwl4965_tid_data *tid_data;
4776         DECLARE_MAC_BUF(mac);
4777
4778         if (likely(tid < ARRAY_SIZE(default_tid_to_tx_fifo)))
4779                 tx_fifo = default_tid_to_tx_fifo[tid];
4780         else
4781                 return -EINVAL;
4782
4783         IWL_WARNING("%s on da = %s tid = %d\n",
4784                         __func__, print_mac(mac, da), tid);
4785
4786         sta_id = iwl4965_hw_find_station(priv, da);
4787         if (sta_id == IWL_INVALID_STATION)
4788                 return -ENXIO;
4789
4790         if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) {
4791                 IWL_ERROR("Start AGG when state is not IWL_AGG_OFF !\n");
4792                 return -ENXIO;
4793         }
4794
4795         txq_id = iwl4965_txq_ctx_activate_free(priv);
4796         if (txq_id == -1)
4797                 return -ENXIO;
4798
4799         spin_lock_irqsave(&priv->sta_lock, flags);
4800         tid_data = &priv->stations[sta_id].tid[tid];
4801         ssn = SEQ_TO_SN(tid_data->seq_number);
4802         tid_data->agg.txq_id = txq_id;
4803         spin_unlock_irqrestore(&priv->sta_lock, flags);
4804
4805         *start_seq_num = ssn;
4806         ret = iwl4965_tx_queue_agg_enable(priv, txq_id, tx_fifo,
4807                                           sta_id, tid, ssn);
4808         if (ret)
4809                 return ret;
4810
4811         ret = 0;
4812         if (tid_data->tfds_in_queue == 0) {
4813                 printk(KERN_ERR "HW queue is empty\n");
4814                 tid_data->agg.state = IWL_AGG_ON;
4815                 ieee80211_start_tx_ba_cb_irqsafe(hw, da, tid);
4816         } else {
4817                 IWL_DEBUG_HT("HW queue is NOT empty: %d packets in HW queue\n",
4818                                 tid_data->tfds_in_queue);
4819                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
4820         }
4821         return ret;
4822 }
4823
4824 static int iwl4965_mac_ht_tx_agg_stop(struct ieee80211_hw *hw, const u8 *da,
4825                                       u16 tid)
4826 {
4827
4828         struct iwl_priv *priv = hw->priv;
4829         int tx_fifo_id, txq_id, sta_id, ssn = -1;
4830         struct iwl4965_tid_data *tid_data;
4831         int ret, write_ptr, read_ptr;
4832         unsigned long flags;
4833         DECLARE_MAC_BUF(mac);
4834
4835         if (!da) {
4836                 IWL_ERROR("da = NULL\n");
4837                 return -EINVAL;
4838         }
4839
4840         if (likely(tid < ARRAY_SIZE(default_tid_to_tx_fifo)))
4841                 tx_fifo_id = default_tid_to_tx_fifo[tid];
4842         else
4843                 return -EINVAL;
4844
4845         sta_id = iwl4965_hw_find_station(priv, da);
4846
4847         if (sta_id == IWL_INVALID_STATION)
4848                 return -ENXIO;
4849
4850         if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_ON)
4851                 IWL_WARNING("Stopping AGG while state not IWL_AGG_ON\n");
4852
4853         tid_data = &priv->stations[sta_id].tid[tid];
4854         ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;
4855         txq_id = tid_data->agg.txq_id;
4856         write_ptr = priv->txq[txq_id].q.write_ptr;
4857         read_ptr = priv->txq[txq_id].q.read_ptr;
4858
4859         /* The queue is not empty */
4860         if (write_ptr != read_ptr) {
4861                 IWL_DEBUG_HT("Stopping a non empty AGG HW QUEUE\n");
4862                 priv->stations[sta_id].tid[tid].agg.state =
4863                                 IWL_EMPTYING_HW_QUEUE_DELBA;
4864                 return 0;
4865         }
4866
4867         IWL_DEBUG_HT("HW queue empty\n");;
4868         priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
4869
4870         spin_lock_irqsave(&priv->lock, flags);
4871         ret = iwl4965_tx_queue_agg_disable(priv, txq_id, ssn, tx_fifo_id);
4872         spin_unlock_irqrestore(&priv->lock, flags);
4873
4874         if (ret)
4875                 return ret;
4876
4877         ieee80211_stop_tx_ba_cb_irqsafe(priv->hw, da, tid);
4878
4879         IWL_DEBUG_INFO("iwl4965_mac_ht_tx_agg_stop on da=%s tid=%d\n",
4880                         print_mac(mac, da), tid);
4881
4882         return 0;
4883 }
4884
4885 int iwl4965_mac_ampdu_action(struct ieee80211_hw *hw,
4886                              enum ieee80211_ampdu_mlme_action action,
4887                              const u8 *addr, u16 tid, u16 *ssn)
4888 {
4889         struct iwl_priv *priv = hw->priv;
4890         int sta_id;
4891         DECLARE_MAC_BUF(mac);
4892
4893         IWL_DEBUG_HT("A-MPDU action on da=%s tid=%d ",
4894                         print_mac(mac, addr), tid);
4895         sta_id = iwl4965_hw_find_station(priv, addr);
4896         switch (action) {
4897         case IEEE80211_AMPDU_RX_START:
4898                 IWL_DEBUG_HT("start Rx\n");
4899                 iwl4965_sta_modify_add_ba_tid(priv, sta_id, tid, *ssn);
4900                 break;
4901         case IEEE80211_AMPDU_RX_STOP:
4902                 IWL_DEBUG_HT("stop Rx\n");
4903                 iwl4965_sta_modify_del_ba_tid(priv, sta_id, tid);
4904                 break;
4905         case IEEE80211_AMPDU_TX_START:
4906                 IWL_DEBUG_HT("start Tx\n");
4907                 return iwl4965_mac_ht_tx_agg_start(hw, addr, tid, ssn);
4908         case IEEE80211_AMPDU_TX_STOP:
4909                 IWL_DEBUG_HT("stop Tx\n");
4910                 return iwl4965_mac_ht_tx_agg_stop(hw, addr, tid);
4911         default:
4912                 IWL_DEBUG_HT("unknown\n");
4913                 return -EINVAL;
4914                 break;
4915         }
4916         return 0;
4917 }
4918
4919 #endif /* CONFIG_IWL4965_HT */
4920
4921 /* Set up 4965-specific Rx frame reply handlers */
4922 void iwl4965_hw_rx_handler_setup(struct iwl_priv *priv)
4923 {
4924         /* Legacy Rx frames */
4925         priv->rx_handlers[REPLY_RX] = iwl4965_rx_reply_rx;
4926
4927         /* High-throughput (HT) Rx frames */
4928         priv->rx_handlers[REPLY_RX_PHY_CMD] = iwl4965_rx_reply_rx_phy;
4929         priv->rx_handlers[REPLY_RX_MPDU_CMD] = iwl4965_rx_reply_rx;
4930
4931         priv->rx_handlers[MISSED_BEACONS_NOTIFICATION] =
4932             iwl4965_rx_missed_beacon_notif;
4933
4934 #ifdef CONFIG_IWL4965_HT
4935         priv->rx_handlers[REPLY_COMPRESSED_BA] = iwl4965_rx_reply_compressed_ba;
4936 #endif /* CONFIG_IWL4965_HT */
4937 }
4938
4939 void iwl4965_hw_setup_deferred_work(struct iwl_priv *priv)
4940 {
4941         INIT_WORK(&priv->txpower_work, iwl4965_bg_txpower_work);
4942         INIT_WORK(&priv->statistics_work, iwl4965_bg_statistics_work);
4943 #ifdef CONFIG_IWL4965_SENSITIVITY
4944         INIT_WORK(&priv->sensitivity_work, iwl4965_bg_sensitivity_work);
4945 #endif
4946         init_timer(&priv->statistics_periodic);
4947         priv->statistics_periodic.data = (unsigned long)priv;
4948         priv->statistics_periodic.function = iwl4965_bg_statistics_periodic;
4949 }
4950
4951 void iwl4965_hw_cancel_deferred_work(struct iwl_priv *priv)
4952 {
4953         del_timer_sync(&priv->statistics_periodic);
4954
4955         cancel_delayed_work(&priv->init_alive_start);
4956 }
4957
4958 static struct iwl_hcmd_utils_ops iwl4965_hcmd_utils = {
4959         .enqueue_hcmd = iwl4965_enqueue_hcmd,
4960 };
4961
4962 static struct iwl_lib_ops iwl4965_lib = {
4963         .init_drv = iwl4965_init_drv,
4964         .eeprom_ops = {
4965                 .verify_signature  = iwlcore_eeprom_verify_signature,
4966                 .acquire_semaphore = iwlcore_eeprom_acquire_semaphore,
4967                 .release_semaphore = iwlcore_eeprom_release_semaphore,
4968         },
4969 };
4970
4971 static struct iwl_ops iwl4965_ops = {
4972         .lib = &iwl4965_lib,
4973         .utils = &iwl4965_hcmd_utils,
4974 };
4975
4976 static struct iwl_cfg iwl4965_agn_cfg = {
4977         .name = "4965AGN",
4978         .fw_name = "iwlwifi-4965" IWL4965_UCODE_API ".ucode",
4979         .sku = IWL_SKU_A|IWL_SKU_G|IWL_SKU_N,
4980         .ops = &iwl4965_ops,
4981         .mod_params = &iwl4965_mod_params,
4982 };
4983
4984 struct pci_device_id iwl4965_hw_card_ids[] = {
4985         {IWL_PCI_DEVICE(0x4229, PCI_ANY_ID, iwl4965_agn_cfg)},
4986         {IWL_PCI_DEVICE(0x4230, PCI_ANY_ID, iwl4965_agn_cfg)},
4987         {0}
4988 };
4989
4990 MODULE_DEVICE_TABLE(pci, iwl4965_hw_card_ids);
4991
4992 module_param_named(antenna, iwl4965_mod_params.antenna, int, 0444);
4993 MODULE_PARM_DESC(antenna, "select antenna (1=Main, 2=Aux, default 0 [both])");
4994 module_param_named(disable, iwl4965_mod_params.disable, int, 0444);
4995 MODULE_PARM_DESC(disable, "manually disable the radio (default 0 [radio on])");
4996 module_param_named(hwcrypto, iwl4965_mod_params.hw_crypto, int, 0444);
4997 MODULE_PARM_DESC(hwcrypto,
4998                  "using hardware crypto engine (default 0 [software])\n");
4999 module_param_named(debug, iwl4965_mod_params.debug, int, 0444);
5000 MODULE_PARM_DESC(debug, "debug output mask");
5001 module_param_named(
5002         disable_hw_scan, iwl4965_mod_params.disable_hw_scan, int, 0444);
5003 MODULE_PARM_DESC(disable_hw_scan, "disable hardware scanning (default 0)");
5004
5005 module_param_named(queues_num, iwl4965_mod_params.num_of_queues, int, 0444);
5006 MODULE_PARM_DESC(queues_num, "number of hw queues.");
5007
5008 /* QoS */
5009 module_param_named(qos_enable, iwl4965_mod_params.enable_qos, int, 0444);
5010 MODULE_PARM_DESC(qos_enable, "enable all QoS functionality");
5011 module_param_named(amsdu_size_8K, iwl4965_mod_params.amsdu_size_8K, int, 0444);
5012 MODULE_PARM_DESC(amsdu_size_8K, "enable 8K amsdu size");
5013