drivers/net/wireless/iwlegacy/iwl-eeprom.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called LICENSE.GPL.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *****************************************************************************/
  62
  63
  64 #include <linux/kernel.h>
  65 #include <linux/module.h>
  66 #include <linux/slab.h>
  67 #include <linux/init.h>
  68
  69 #include <net/mac80211.h>
  70
  71 #include "iwl-commands.h"
  72 #include "iwl-dev.h"
  73 #include "iwl-core.h"
  74 #include "iwl-debug.h"
  75 #include "iwl-eeprom.h"
  76 #include "iwl-io.h"
  77
  78 /************************** EEPROM BANDS ****************************
  79  *
  80  * The iwlegacy_eeprom_band definitions below provide the mapping from the
  81  * EEPROM contents to the specific channel number supported for each
  82  * band.
  83  *
  84  * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
  85  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
  86  * The specific geography and calibration information for that channel
  87  * is contained in the eeprom map itself.
  88  *
  89  * During init, we copy the eeprom information and channel map
  90  * information into priv->channel_info_24/52 and priv->channel_map_24/52
  91  *
  92  * channel_map_24/52 provides the index in the channel_info array for a
  93  * given channel.  We have to have two separate maps as there is channel
  94  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
  95  * band_2
  96  *
  97  * A value of 0xff stored in the channel_map indicates that the channel
  98  * is not supported by the hardware at all.
  99  *
 100  * A value of 0xfe in the channel_map indicates that the channel is not
 101  * valid for Tx with the current hardware.  This means that
 102  * while the system can tune and receive on a given channel, it may not
 103  * be able to associate or transmit any frames on that
 104  * channel.  There is no corresponding channel information for that
 105  * entry.
 106  *
 107  *********************************************************************/
 108
 109 /* 2.4 GHz */
 110 const u8 iwlegacy_eeprom_band_1[14] = {
 111         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
 112 };
 113
 114 /* 5.2 GHz bands */
 115 static const u8 iwlegacy_eeprom_band_2[] = {    /* 4915-5080MHz */
 116         183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
 117 };
 118
 119 static const u8 iwlegacy_eeprom_band_3[] = {    /* 5170-5320MHz */
 120         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
 121 };
 122
 123 static const u8 iwlegacy_eeprom_band_4[] = {    /* 5500-5700MHz */
 124         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
 125 };
 126
 127 static const u8 iwlegacy_eeprom_band_5[] = {    /* 5725-5825MHz */
 128         145, 149, 153, 157, 161, 165
 129 };
 130
 131 static const u8 iwlegacy_eeprom_band_6[] = {       /* 2.4 ht40 channel */
 132         1, 2, 3, 4, 5, 6, 7
 133 };
 134
 135 static const u8 iwlegacy_eeprom_band_7[] = {       /* 5.2 ht40 channel */
 136         36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
 137 };
 138
 139 /******************************************************************************
 140  *
 141  * EEPROM related functions
 142  *
 143 ******************************************************************************/
 144
 145 static int iwl_legacy_eeprom_verify_signature(struct iwl_priv *priv)
 146 {
 147         u32 gp = iwl_read32(priv, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
 148         int ret = 0;
 149
 150         IWL_DEBUG_EEPROM(priv, "EEPROM signature=0x%08x\n", gp);
 151         switch (gp) {
 152         case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
 153         case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
 154                 break;
 155         default:
 156                 IWL_ERR(priv, "bad EEPROM signature,"
 157                         "EEPROM_GP=0x%08x\n", gp);
 158                 ret = -ENOENT;
 159                 break;
 160         }
 161         return ret;
 162 }
 163
 164 const u8
 165 *iwl_legacy_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
 166 {
 167         BUG_ON(offset >= priv->cfg->base_params->eeprom_size);
 168         return &priv->eeprom[offset];
 169 }
 170 EXPORT_SYMBOL(iwl_legacy_eeprom_query_addr);
 171
 172 u16 iwl_legacy_eeprom_query16(const struct iwl_priv *priv, size_t offset)
 173 {
 174         if (!priv->eeprom)
 175                 return 0;
 176         return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
 177 }
 178 EXPORT_SYMBOL(iwl_legacy_eeprom_query16);
 179
 180 /**
 181  * iwl_legacy_eeprom_init - read EEPROM contents
 182  *
 183  * Load the EEPROM contents from adapter into priv->eeprom
 184  *
 185  * NOTE:  This routine uses the non-debug IO access functions.
 186  */
 187 int iwl_legacy_eeprom_init(struct iwl_priv *priv)
 188 {
 189         __le16 *e;
 190         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
 191         int sz;
 192         int ret;
 193         u16 addr;
 194
 195         /* allocate eeprom */
 196         sz = priv->cfg->base_params->eeprom_size;
 197         IWL_DEBUG_EEPROM(priv, "NVM size = %d\n", sz);
 198         priv->eeprom = kzalloc(sz, GFP_KERNEL);
 199         if (!priv->eeprom) {
 200                 ret = -ENOMEM;
 201                 goto alloc_err;
 202         }
 203         e = (__le16 *)priv->eeprom;
 204
 205         priv->cfg->ops->lib->apm_ops.init(priv);
 206
 207         ret = iwl_legacy_eeprom_verify_signature(priv);
 208         if (ret < 0) {
 209                 IWL_ERR(priv, "EEPROM not found, EEPROM_GP=0x%08x\n", gp);
 210                 ret = -ENOENT;
 211                 goto err;
 212         }
 213
 214         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
 215         ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
 216         if (ret < 0) {
 217                 IWL_ERR(priv, "Failed to acquire EEPROM semaphore.\n");
 218                 ret = -ENOENT;
 219                 goto err;
 220         }
 221
 222         /* eeprom is an array of 16bit values */
 223         for (addr = 0; addr < sz; addr += sizeof(u16)) {
 224                 u32 r;
 225
 226                 _iwl_legacy_write32(priv, CSR_EEPROM_REG,
 227                              CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
 228
 229                 ret = iwl_poll_bit(priv, CSR_EEPROM_REG,
 230                                           CSR_EEPROM_REG_READ_VALID_MSK,
 231                                           CSR_EEPROM_REG_READ_VALID_MSK,
 232                                           IWL_EEPROM_ACCESS_TIMEOUT);
 233                 if (ret < 0) {
 234                         IWL_ERR(priv, "Time out reading EEPROM[%d]\n",
 235                                                         addr);
 236                         goto done;
 237                 }
 238                 r = _iwl_legacy_read_direct32(priv, CSR_EEPROM_REG);
 239                 e[addr / 2] = cpu_to_le16(r >> 16);
 240         }
 241
 242         IWL_DEBUG_EEPROM(priv, "NVM Type: %s, version: 0x%x\n",
 243                        "EEPROM",
 244                        iwl_legacy_eeprom_query16(priv, EEPROM_VERSION));
 245
 246         ret = 0;
 247 done:
 248         priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
 249
 250 err:
 251         if (ret)
 252                 iwl_legacy_eeprom_free(priv);
 253         /* Reset chip to save power until we load uCode during "up". */
 254         iwl_legacy_apm_stop(priv);
 255 alloc_err:
 256         return ret;
 257 }
 258 EXPORT_SYMBOL(iwl_legacy_eeprom_init);
 259
 260 void iwl_legacy_eeprom_free(struct iwl_priv *priv)
 261 {
 262         kfree(priv->eeprom);
 263         priv->eeprom = NULL;
 264 }
 265 EXPORT_SYMBOL(iwl_legacy_eeprom_free);
 266
 267 static void iwl_legacy_init_band_reference(const struct iwl_priv *priv,
 268                         int eep_band, int *eeprom_ch_count,
 269                         const struct iwl_eeprom_channel **eeprom_ch_info,
 270                         const u8 **eeprom_ch_index)
 271 {
 272         u32 offset = priv->cfg->ops->lib->
 273                         eeprom_ops.regulatory_bands[eep_band - 1];
 274         switch (eep_band) {
 275         case 1:         /* 2.4GHz band */
 276                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_1);
 277                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 278                                 iwl_legacy_eeprom_query_addr(priv, offset);
 279                 *eeprom_ch_index = iwlegacy_eeprom_band_1;
 280                 break;
 281         case 2:         /* 4.9GHz band */
 282                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_2);
 283                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 284                                 iwl_legacy_eeprom_query_addr(priv, offset);
 285                 *eeprom_ch_index = iwlegacy_eeprom_band_2;
 286                 break;
 287         case 3:         /* 5.2GHz band */
 288                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_3);
 289                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 290                                 iwl_legacy_eeprom_query_addr(priv, offset);
 291                 *eeprom_ch_index = iwlegacy_eeprom_band_3;
 292                 break;
 293         case 4:         /* 5.5GHz band */
 294                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_4);
 295                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 296                                 iwl_legacy_eeprom_query_addr(priv, offset);
 297                 *eeprom_ch_index = iwlegacy_eeprom_band_4;
 298                 break;
 299         case 5:         /* 5.7GHz band */
 300                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_5);
 301                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 302                                 iwl_legacy_eeprom_query_addr(priv, offset);
 303                 *eeprom_ch_index = iwlegacy_eeprom_band_5;
 304                 break;
 305         case 6:         /* 2.4GHz ht40 channels */
 306                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_6);
 307                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 308                                 iwl_legacy_eeprom_query_addr(priv, offset);
 309                 *eeprom_ch_index = iwlegacy_eeprom_band_6;
 310                 break;
 311         case 7:         /* 5 GHz ht40 channels */
 312                 *eeprom_ch_count = ARRAY_SIZE(iwlegacy_eeprom_band_7);
 313                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 314                                 iwl_legacy_eeprom_query_addr(priv, offset);
 315                 *eeprom_ch_index = iwlegacy_eeprom_band_7;
 316                 break;
 317         default:
 318                 BUG();
 319                 return;
 320         }
 321 }
 322
 323 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
 324                             ? # x " " : "")
 325 /**
 326  * iwl_legacy_mod_ht40_chan_info - Copy ht40 channel info into driver's priv.
 327  *
 328  * Does not set up a command, or touch hardware.
 329  */
 330 static int iwl_legacy_mod_ht40_chan_info(struct iwl_priv *priv,
 331                               enum ieee80211_band band, u16 channel,
 332                               const struct iwl_eeprom_channel *eeprom_ch,
 333                               u8 clear_ht40_extension_channel)
 334 {
 335         struct iwl_channel_info *ch_info;
 336
 337         ch_info = (struct iwl_channel_info *)
 338                         iwl_legacy_get_channel_info(priv, band, channel);
 339
 340         if (!iwl_legacy_is_channel_valid(ch_info))
 341                 return -1;
 342
 343         IWL_DEBUG_EEPROM(priv, "HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
 344                         " Ad-Hoc %ssupported\n",
 345                         ch_info->channel,
 346                         iwl_legacy_is_channel_a_band(ch_info) ?
 347                         "5.2" : "2.4",
 348                         CHECK_AND_PRINT(IBSS),
 349                         CHECK_AND_PRINT(ACTIVE),
 350                         CHECK_AND_PRINT(RADAR),
 351                         CHECK_AND_PRINT(WIDE),
 352                         CHECK_AND_PRINT(DFS),
 353                         eeprom_ch->flags,
 354                         eeprom_ch->max_power_avg,
 355                         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
 356                          && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
 357                         "" : "not ");
 358
 359         ch_info->ht40_eeprom = *eeprom_ch;
 360         ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
 361         ch_info->ht40_flags = eeprom_ch->flags;
 362         if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
 363                 ch_info->ht40_extension_channel &=
 364                                         ~clear_ht40_extension_channel;
 365
 366         return 0;
 367 }
 368
 369 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
 370                             ? # x " " : "")
 371
 372 /**
 373  * iwl_legacy_init_channel_map - Set up driver's info for all possible channels
 374  */
 375 int iwl_legacy_init_channel_map(struct iwl_priv *priv)
 376 {
 377         int eeprom_ch_count = 0;
 378         const u8 *eeprom_ch_index = NULL;
 379         const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
 380         int band, ch;
 381         struct iwl_channel_info *ch_info;
 382
 383         if (priv->channel_count) {
 384                 IWL_DEBUG_EEPROM(priv, "Channel map already initialized.\n");
 385                 return 0;
 386         }
 387
 388         IWL_DEBUG_EEPROM(priv, "Initializing regulatory info from EEPROM\n");
 389
 390         priv->channel_count =
 391             ARRAY_SIZE(iwlegacy_eeprom_band_1) +
 392             ARRAY_SIZE(iwlegacy_eeprom_band_2) +
 393             ARRAY_SIZE(iwlegacy_eeprom_band_3) +
 394             ARRAY_SIZE(iwlegacy_eeprom_band_4) +
 395             ARRAY_SIZE(iwlegacy_eeprom_band_5);
 396
 397         IWL_DEBUG_EEPROM(priv, "Parsing data for %d channels.\n",
 398                         priv->channel_count);
 399
 400         priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
 401                                      priv->channel_count, GFP_KERNEL);
 402         if (!priv->channel_info) {
 403                 IWL_ERR(priv, "Could not allocate channel_info\n");
 404                 priv->channel_count = 0;
 405                 return -ENOMEM;
 406         }
 407
 408         ch_info = priv->channel_info;
 409
 410         /* Loop through the 5 EEPROM bands adding them in order to the
 411          * channel map we maintain (that contains additional information than
 412          * what just in the EEPROM) */
 413         for (band = 1; band <= 5; band++) {
 414
 415                 iwl_legacy_init_band_reference(priv, band, &eeprom_ch_count,
 416                                         &eeprom_ch_info, &eeprom_ch_index);
 417
 418                 /* Loop through each band adding each of the channels */
 419                 for (ch = 0; ch < eeprom_ch_count; ch++) {
 420                         ch_info->channel = eeprom_ch_index[ch];
 421                         ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
 422                             IEEE80211_BAND_5GHZ;
 423
 424                         /* permanently store EEPROM's channel regulatory flags
 425                          *   and max power in channel info database. */
 426                         ch_info->eeprom = eeprom_ch_info[ch];
 427
 428                         /* Copy the run-time flags so they are there even on
 429                          * invalid channels */
 430                         ch_info->flags = eeprom_ch_info[ch].flags;
 431                         /* First write that ht40 is not enabled, and then enable
 432                          * one by one */
 433                         ch_info->ht40_extension_channel =
 434                                         IEEE80211_CHAN_NO_HT40;
 435
 436                         if (!(iwl_legacy_is_channel_valid(ch_info))) {
 437                                 IWL_DEBUG_EEPROM(priv,
 438                                                "Ch. %d Flags %x [%sGHz] - "
 439                                                "No traffic\n",
 440                                                ch_info->channel,
 441                                                ch_info->flags,
 442                                                iwl_legacy_is_channel_a_band(ch_info) ?
 443                                                "5.2" : "2.4");
 444                                 ch_info++;
 445                                 continue;
 446                         }
 447
 448                         /* Initialize regulatory-based run-time data */
 449                         ch_info->max_power_avg = ch_info->curr_txpow =
 450                             eeprom_ch_info[ch].max_power_avg;
 451                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
 452                         ch_info->min_power = 0;
 453
 454                         IWL_DEBUG_EEPROM(priv, "Ch. %d [%sGHz] "
 455                                        "%s%s%s%s%s%s(0x%02x %ddBm):"
 456                                        " Ad-Hoc %ssupported\n",
 457                                        ch_info->channel,
 458                                        iwl_legacy_is_channel_a_band(ch_info) ?
 459                                        "5.2" : "2.4",
 460                                        CHECK_AND_PRINT_I(VALID),
 461                                        CHECK_AND_PRINT_I(IBSS),
 462                                        CHECK_AND_PRINT_I(ACTIVE),
 463                                        CHECK_AND_PRINT_I(RADAR),
 464                                        CHECK_AND_PRINT_I(WIDE),
 465                                        CHECK_AND_PRINT_I(DFS),
 466                                        eeprom_ch_info[ch].flags,
 467                                        eeprom_ch_info[ch].max_power_avg,
 468                                        ((eeprom_ch_info[ch].
 469                                          flags & EEPROM_CHANNEL_IBSS)
 470                                         && !(eeprom_ch_info[ch].
 471                                              flags & EEPROM_CHANNEL_RADAR))
 472                                        ? "" : "not ");
 473
 474                         /* Set the tx_power_user_lmt to the highest power
 475                          * supported by any channel */
 476                         if (eeprom_ch_info[ch].max_power_avg >
 477                                                 priv->tx_power_user_lmt)
 478                                 priv->tx_power_user_lmt =
 479                                     eeprom_ch_info[ch].max_power_avg;
 480
 481                         ch_info++;
 482                 }
 483         }
 484
 485         /* Check if we do have HT40 channels */
 486         if (priv->cfg->ops->lib->eeprom_ops.regulatory_bands[5] ==
 487             EEPROM_REGULATORY_BAND_NO_HT40 &&
 488             priv->cfg->ops->lib->eeprom_ops.regulatory_bands[6] ==
 489             EEPROM_REGULATORY_BAND_NO_HT40)
 490                 return 0;
 491
 492         /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
 493         for (band = 6; band <= 7; band++) {
 494                 enum ieee80211_band ieeeband;
 495
 496                 iwl_legacy_init_band_reference(priv, band, &eeprom_ch_count,
 497                                         &eeprom_ch_info, &eeprom_ch_index);
 498
 499                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
 500                 ieeeband =
 501                         (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 502
 503                 /* Loop through each band adding each of the channels */
 504                 for (ch = 0; ch < eeprom_ch_count; ch++) {
 505                         /* Set up driver's info for lower half */
 506                         iwl_legacy_mod_ht40_chan_info(priv, ieeeband,
 507                                                 eeprom_ch_index[ch],
 508                                                 &eeprom_ch_info[ch],
 509                                                 IEEE80211_CHAN_NO_HT40PLUS);
 510
 511                         /* Set up driver's info for upper half */
 512                         iwl_legacy_mod_ht40_chan_info(priv, ieeeband,
 513                                                 eeprom_ch_index[ch] + 4,
 514                                                 &eeprom_ch_info[ch],
 515                                                 IEEE80211_CHAN_NO_HT40MINUS);
 516                 }
 517         }
 518
 519         return 0;
 520 }
 521 EXPORT_SYMBOL(iwl_legacy_init_channel_map);
 522
 523 /*
 524  * iwl_legacy_free_channel_map - undo allocations in iwl_legacy_init_channel_map
 525  */
 526 void iwl_legacy_free_channel_map(struct iwl_priv *priv)
 527 {
 528         kfree(priv->channel_info);
 529         priv->channel_count = 0;
 530 }
 531 EXPORT_SYMBOL(iwl_legacy_free_channel_map);
 532
 533 /**
 534  * iwl_legacy_get_channel_info - Find driver's private channel info
 535  *
 536  * Based on band and channel number.
 537  */
 538 const struct
 539 iwl_channel_info *iwl_legacy_get_channel_info(const struct iwl_priv *priv,
 540                                         enum ieee80211_band band, u16 channel)
 541 {
 542         int i;
 543
 544         switch (band) {
 545         case IEEE80211_BAND_5GHZ:
 546                 for (i = 14; i < priv->channel_count; i++) {
 547                         if (priv->channel_info[i].channel == channel)
 548                                 return &priv->channel_info[i];
 549                 }
 550                 break;
 551         case IEEE80211_BAND_2GHZ:
 552                 if (channel >= 1 && channel <= 14)
 553                         return &priv->channel_info[channel - 1];
 554                 break;
 555         default:
 556                 BUG();
 557         }
 558
 559         return NULL;
 560 }
 561 EXPORT_SYMBOL(iwl_legacy_get_channel_info);