drivers/net/wireless/iwlwifi/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 iwl_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 iwl_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 iwl_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 iwl_eeprom_band_3[] = { /* 5170-5320MHz */
 120         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
 121 };
 122
 123 static const u8 iwl_eeprom_band_4[] = { /* 5500-5700MHz */
 124         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
 125 };
 126
 127 static const u8 iwl_eeprom_band_5[] = { /* 5725-5825MHz */
 128         145, 149, 153, 157, 161, 165
 129 };
 130
 131 static const u8 iwl_eeprom_band_6[] = {       /* 2.4 ht40 channel */
 132         1, 2, 3, 4, 5, 6, 7
 133 };
 134
 135 static const u8 iwl_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 /*
 146  * The device's EEPROM semaphore prevents conflicts between driver and uCode
 147  * when accessing the EEPROM; each access is a series of pulses to/from the
 148  * EEPROM chip, not a single event, so even reads could conflict if they
 149  * weren't arbitrated by the semaphore.
 150  */
 151 static int iwl_eeprom_acquire_semaphore(struct iwl_priv *priv)
 152 {
 153         u16 count;
 154         int ret;
 155
 156         for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
 157                 /* Request semaphore */
 158                 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
 159                             CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 160
 161                 /* See if we got it */
 162                 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
 163                                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 164                                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 165                                 EEPROM_SEM_TIMEOUT);
 166                 if (ret >= 0) {
 167                         IWL_DEBUG_EEPROM(priv,
 168                                 "Acquired semaphore after %d tries.\n",
 169                                 count+1);
 170                         return ret;
 171                 }
 172         }
 173
 174         return ret;
 175 }
 176
 177 static void iwl_eeprom_release_semaphore(struct iwl_priv *priv)
 178 {
 179         iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
 180                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 181
 182 }
 183
 184 static int iwl_eeprom_verify_signature(struct iwl_priv *priv)
 185 {
 186         u32 gp = iwl_read32(priv, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
 187         int ret = 0;
 188
 189         IWL_DEBUG_EEPROM(priv, "EEPROM signature=0x%08x\n", gp);
 190         switch (gp) {
 191         case CSR_EEPROM_GP_BAD_SIG_EEP_GOOD_SIG_OTP:
 192                 if (priv->nvm_device_type != NVM_DEVICE_TYPE_OTP) {
 193                         IWL_ERR(priv, "EEPROM with bad signature: 0x%08x\n",
 194                                 gp);
 195                         ret = -ENOENT;
 196                 }
 197                 break;
 198         case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
 199         case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
 200                 if (priv->nvm_device_type != NVM_DEVICE_TYPE_EEPROM) {
 201                         IWL_ERR(priv, "OTP with bad signature: 0x%08x\n", gp);
 202                         ret = -ENOENT;
 203                 }
 204                 break;
 205         case CSR_EEPROM_GP_BAD_SIGNATURE_BOTH_EEP_AND_OTP:
 206         default:
 207                 IWL_ERR(priv, "bad EEPROM/OTP signature, type=%s, "
 208                         "EEPROM_GP=0x%08x\n",
 209                         (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP)
 210                         ? "OTP" : "EEPROM", gp);
 211                 ret = -ENOENT;
 212                 break;
 213         }
 214         return ret;
 215 }
 216
 217 static void iwl_set_otp_access(struct iwl_priv *priv, enum iwl_access_mode mode)
 218 {
 219         iwl_read32(priv, CSR_OTP_GP_REG);
 220
 221         if (mode == IWL_OTP_ACCESS_ABSOLUTE)
 222                 iwl_clear_bit(priv, CSR_OTP_GP_REG,
 223                               CSR_OTP_GP_REG_OTP_ACCESS_MODE);
 224         else
 225                 iwl_set_bit(priv, CSR_OTP_GP_REG,
 226                             CSR_OTP_GP_REG_OTP_ACCESS_MODE);
 227 }
 228
 229 static int iwlcore_get_nvm_type(struct iwl_priv *priv, u32 hw_rev)
 230 {
 231         u32 otpgp;
 232         int nvm_type;
 233
 234         /* OTP only valid for CP/PP and after */
 235         switch (hw_rev & CSR_HW_REV_TYPE_MSK) {
 236         case CSR_HW_REV_TYPE_NONE:
 237                 IWL_ERR(priv, "Unknown hardware type\n");
 238                 return -ENOENT;
 239         case CSR_HW_REV_TYPE_5300:
 240         case CSR_HW_REV_TYPE_5350:
 241         case CSR_HW_REV_TYPE_5100:
 242         case CSR_HW_REV_TYPE_5150:
 243                 nvm_type = NVM_DEVICE_TYPE_EEPROM;
 244                 break;
 245         default:
 246                 otpgp = iwl_read32(priv, CSR_OTP_GP_REG);
 247                 if (otpgp & CSR_OTP_GP_REG_DEVICE_SELECT)
 248                         nvm_type = NVM_DEVICE_TYPE_OTP;
 249                 else
 250                         nvm_type = NVM_DEVICE_TYPE_EEPROM;
 251                 break;
 252         }
 253         return  nvm_type;
 254 }
 255
 256 static int iwl_init_otp_access(struct iwl_priv *priv)
 257 {
 258         int ret;
 259
 260         /* Enable 40MHz radio clock */
 261         iwl_write32(priv, CSR_GP_CNTRL,
 262                     iwl_read32(priv, CSR_GP_CNTRL) |
 263                     CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 264
 265         /* wait for clock to be ready */
 266         ret = iwl_poll_bit(priv, CSR_GP_CNTRL,
 267                                  CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
 268                                  CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
 269                                  25000);
 270         if (ret < 0)
 271                 IWL_ERR(priv, "Time out access OTP\n");
 272         else {
 273                 iwl_set_bits_prph(priv, APMG_PS_CTRL_REG,
 274                                   APMG_PS_CTRL_VAL_RESET_REQ);
 275                 udelay(5);
 276                 iwl_clear_bits_prph(priv, APMG_PS_CTRL_REG,
 277                                     APMG_PS_CTRL_VAL_RESET_REQ);
 278
 279                 /*
 280                  * CSR auto clock gate disable bit -
 281                  * this is only applicable for HW with OTP shadow RAM
 282                  */
 283                 if (priv->cfg->base_params->shadow_ram_support)
 284                         iwl_set_bit(priv, CSR_DBG_LINK_PWR_MGMT_REG,
 285                                 CSR_RESET_LINK_PWR_MGMT_DISABLED);
 286         }
 287         return ret;
 288 }
 289
 290 static int iwl_read_otp_word(struct iwl_priv *priv, u16 addr, __le16 *eeprom_data)
 291 {
 292         int ret = 0;
 293         u32 r;
 294         u32 otpgp;
 295
 296         iwl_write32(priv, CSR_EEPROM_REG,
 297                     CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
 298         ret = iwl_poll_bit(priv, CSR_EEPROM_REG,
 299                                  CSR_EEPROM_REG_READ_VALID_MSK,
 300                                  CSR_EEPROM_REG_READ_VALID_MSK,
 301                                  IWL_EEPROM_ACCESS_TIMEOUT);
 302         if (ret < 0) {
 303                 IWL_ERR(priv, "Time out reading OTP[%d]\n", addr);
 304                 return ret;
 305         }
 306         r = iwl_read32(priv, CSR_EEPROM_REG);
 307         /* check for ECC errors: */
 308         otpgp = iwl_read32(priv, CSR_OTP_GP_REG);
 309         if (otpgp & CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK) {
 310                 /* stop in this case */
 311                 /* set the uncorrectable OTP ECC bit for acknowledgement */
 312                 iwl_set_bit(priv, CSR_OTP_GP_REG,
 313                         CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK);
 314                 IWL_ERR(priv, "Uncorrectable OTP ECC error, abort OTP read\n");
 315                 return -EINVAL;
 316         }
 317         if (otpgp & CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK) {
 318                 /* continue in this case */
 319                 /* set the correctable OTP ECC bit for acknowledgement */
 320                 iwl_set_bit(priv, CSR_OTP_GP_REG,
 321                                 CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK);
 322                 IWL_ERR(priv, "Correctable OTP ECC error, continue read\n");
 323         }
 324         *eeprom_data = cpu_to_le16(r >> 16);
 325         return 0;
 326 }
 327
 328 /*
 329  * iwl_is_otp_empty: check for empty OTP
 330  */
 331 static bool iwl_is_otp_empty(struct iwl_priv *priv)
 332 {
 333         u16 next_link_addr = 0;
 334         __le16 link_value;
 335         bool is_empty = false;
 336
 337         /* locate the beginning of OTP link list */
 338         if (!iwl_read_otp_word(priv, next_link_addr, &link_value)) {
 339                 if (!link_value) {
 340                         IWL_ERR(priv, "OTP is empty\n");
 341                         is_empty = true;
 342                 }
 343         } else {
 344                 IWL_ERR(priv, "Unable to read first block of OTP list.\n");
 345                 is_empty = true;
 346         }
 347
 348         return is_empty;
 349 }
 350
 351
 352 /*
 353  * iwl_find_otp_image: find EEPROM image in OTP
 354  *   finding the OTP block that contains the EEPROM image.
 355  *   the last valid block on the link list (the block _before_ the last block)
 356  *   is the block we should read and used to configure the device.
 357  *   If all the available OTP blocks are full, the last block will be the block
 358  *   we should read and used to configure the device.
 359  *   only perform this operation if shadow RAM is disabled
 360  */
 361 static int iwl_find_otp_image(struct iwl_priv *priv,
 362                                         u16 *validblockaddr)
 363 {
 364         u16 next_link_addr = 0, valid_addr;
 365         __le16 link_value = 0;
 366         int usedblocks = 0;
 367
 368         /* set addressing mode to absolute to traverse the link list */
 369         iwl_set_otp_access(priv, IWL_OTP_ACCESS_ABSOLUTE);
 370
 371         /* checking for empty OTP or error */
 372         if (iwl_is_otp_empty(priv))
 373                 return -EINVAL;
 374
 375         /*
 376          * start traverse link list
 377          * until reach the max number of OTP blocks
 378          * different devices have different number of OTP blocks
 379          */
 380         do {
 381                 /* save current valid block address
 382                  * check for more block on the link list
 383                  */
 384                 valid_addr = next_link_addr;
 385                 next_link_addr = le16_to_cpu(link_value) * sizeof(u16);
 386                 IWL_DEBUG_EEPROM(priv, "OTP blocks %d addr 0x%x\n",
 387                                usedblocks, next_link_addr);
 388                 if (iwl_read_otp_word(priv, next_link_addr, &link_value))
 389                         return -EINVAL;
 390                 if (!link_value) {
 391                         /*
 392                          * reach the end of link list, return success and
 393                          * set address point to the starting address
 394                          * of the image
 395                          */
 396                         *validblockaddr = valid_addr;
 397                         /* skip first 2 bytes (link list pointer) */
 398                         *validblockaddr += 2;
 399                         return 0;
 400                 }
 401                 /* more in the link list, continue */
 402                 usedblocks++;
 403         } while (usedblocks <= priv->cfg->base_params->max_ll_items);
 404
 405         /* OTP has no valid blocks */
 406         IWL_DEBUG_EEPROM(priv, "OTP has no valid blocks\n");
 407         return -EINVAL;
 408 }
 409
 410 const u8 *iwl_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
 411 {
 412         return priv->cfg->ops->lib->eeprom_ops.query_addr(priv, offset);
 413 }
 414
 415 u16 iwl_eeprom_query16(const struct iwl_priv *priv, size_t offset)
 416 {
 417         if (!priv->eeprom)
 418                 return 0;
 419         return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
 420 }
 421
 422 /**
 423  * iwl_eeprom_init - read EEPROM contents
 424  *
 425  * Load the EEPROM contents from adapter into priv->eeprom
 426  *
 427  * NOTE:  This routine uses the non-debug IO access functions.
 428  */
 429 int iwl_eeprom_init(struct iwl_priv *priv, u32 hw_rev)
 430 {
 431         __le16 *e;
 432         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
 433         int sz;
 434         int ret;
 435         u16 addr;
 436         u16 validblockaddr = 0;
 437         u16 cache_addr = 0;
 438
 439         priv->nvm_device_type = iwlcore_get_nvm_type(priv, hw_rev);
 440         if (priv->nvm_device_type == -ENOENT)
 441                 return -ENOENT;
 442         /* allocate eeprom */
 443         sz = priv->cfg->base_params->eeprom_size;
 444         IWL_DEBUG_EEPROM(priv, "NVM size = %d\n", sz);
 445         priv->eeprom = kzalloc(sz, GFP_KERNEL);
 446         if (!priv->eeprom) {
 447                 ret = -ENOMEM;
 448                 goto alloc_err;
 449         }
 450         e = (__le16 *)priv->eeprom;
 451
 452         priv->cfg->ops->lib->apm_ops.init(priv);
 453
 454         ret = iwl_eeprom_verify_signature(priv);
 455         if (ret < 0) {
 456                 IWL_ERR(priv, "EEPROM not found, EEPROM_GP=0x%08x\n", gp);
 457                 ret = -ENOENT;
 458                 goto err;
 459         }
 460
 461         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
 462         ret = iwl_eeprom_acquire_semaphore(priv);
 463         if (ret < 0) {
 464                 IWL_ERR(priv, "Failed to acquire EEPROM semaphore.\n");
 465                 ret = -ENOENT;
 466                 goto err;
 467         }
 468
 469         if (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP) {
 470
 471                 ret = iwl_init_otp_access(priv);
 472                 if (ret) {
 473                         IWL_ERR(priv, "Failed to initialize OTP access.\n");
 474                         ret = -ENOENT;
 475                         goto done;
 476                 }
 477                 iwl_write32(priv, CSR_EEPROM_GP,
 478                             iwl_read32(priv, CSR_EEPROM_GP) &
 479                             ~CSR_EEPROM_GP_IF_OWNER_MSK);
 480
 481                 iwl_set_bit(priv, CSR_OTP_GP_REG,
 482                              CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK |
 483                              CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK);
 484                 /* traversing the linked list if no shadow ram supported */
 485                 if (!priv->cfg->base_params->shadow_ram_support) {
 486                         if (iwl_find_otp_image(priv, &validblockaddr)) {
 487                                 ret = -ENOENT;
 488                                 goto done;
 489                         }
 490                 }
 491                 for (addr = validblockaddr; addr < validblockaddr + sz;
 492                      addr += sizeof(u16)) {
 493                         __le16 eeprom_data;
 494
 495                         ret = iwl_read_otp_word(priv, addr, &eeprom_data);
 496                         if (ret)
 497                                 goto done;
 498                         e[cache_addr / 2] = eeprom_data;
 499                         cache_addr += sizeof(u16);
 500                 }
 501         } else {
 502                 /* eeprom is an array of 16bit values */
 503                 for (addr = 0; addr < sz; addr += sizeof(u16)) {
 504                         u32 r;
 505
 506                         iwl_write32(priv, CSR_EEPROM_REG,
 507                                     CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
 508
 509                         ret = iwl_poll_bit(priv, CSR_EEPROM_REG,
 510                                                   CSR_EEPROM_REG_READ_VALID_MSK,
 511                                                   CSR_EEPROM_REG_READ_VALID_MSK,
 512                                                   IWL_EEPROM_ACCESS_TIMEOUT);
 513                         if (ret < 0) {
 514                                 IWL_ERR(priv, "Time out reading EEPROM[%d]\n", addr);
 515                                 goto done;
 516                         }
 517                         r = iwl_read32(priv, CSR_EEPROM_REG);
 518                         e[addr / 2] = cpu_to_le16(r >> 16);
 519                 }
 520         }
 521
 522         IWL_DEBUG_EEPROM(priv, "NVM Type: %s, version: 0x%x\n",
 523                        (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP)
 524                        ? "OTP" : "EEPROM",
 525                        iwl_eeprom_query16(priv, EEPROM_VERSION));
 526
 527         ret = 0;
 528 done:
 529         iwl_eeprom_release_semaphore(priv);
 530
 531 err:
 532         if (ret)
 533                 iwl_eeprom_free(priv);
 534         /* Reset chip to save power until we load uCode during "up". */
 535         iwl_apm_stop(priv);
 536 alloc_err:
 537         return ret;
 538 }
 539
 540 void iwl_eeprom_free(struct iwl_priv *priv)
 541 {
 542         kfree(priv->eeprom);
 543         priv->eeprom = NULL;
 544 }
 545
 546 static void iwl_init_band_reference(const struct iwl_priv *priv,
 547                         int eep_band, int *eeprom_ch_count,
 548                         const struct iwl_eeprom_channel **eeprom_ch_info,
 549                         const u8 **eeprom_ch_index)
 550 {
 551         u32 offset = priv->cfg->ops->lib->
 552                         eeprom_ops.regulatory_bands[eep_band - 1];
 553         switch (eep_band) {
 554         case 1:         /* 2.4GHz band */
 555                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_1);
 556                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 557                                 iwl_eeprom_query_addr(priv, offset);
 558                 *eeprom_ch_index = iwl_eeprom_band_1;
 559                 break;
 560         case 2:         /* 4.9GHz band */
 561                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_2);
 562                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 563                                 iwl_eeprom_query_addr(priv, offset);
 564                 *eeprom_ch_index = iwl_eeprom_band_2;
 565                 break;
 566         case 3:         /* 5.2GHz band */
 567                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_3);
 568                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 569                                 iwl_eeprom_query_addr(priv, offset);
 570                 *eeprom_ch_index = iwl_eeprom_band_3;
 571                 break;
 572         case 4:         /* 5.5GHz band */
 573                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_4);
 574                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 575                                 iwl_eeprom_query_addr(priv, offset);
 576                 *eeprom_ch_index = iwl_eeprom_band_4;
 577                 break;
 578         case 5:         /* 5.7GHz band */
 579                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_5);
 580                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 581                                 iwl_eeprom_query_addr(priv, offset);
 582                 *eeprom_ch_index = iwl_eeprom_band_5;
 583                 break;
 584         case 6:         /* 2.4GHz ht40 channels */
 585                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_6);
 586                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 587                                 iwl_eeprom_query_addr(priv, offset);
 588                 *eeprom_ch_index = iwl_eeprom_band_6;
 589                 break;
 590         case 7:         /* 5 GHz ht40 channels */
 591                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_7);
 592                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
 593                                 iwl_eeprom_query_addr(priv, offset);
 594                 *eeprom_ch_index = iwl_eeprom_band_7;
 595                 break;
 596         default:
 597                 BUG();
 598                 return;
 599         }
 600 }
 601
 602 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
 603                             ? # x " " : "")
 604 /**
 605  * iwl_mod_ht40_chan_info - Copy ht40 channel info into driver's priv.
 606  *
 607  * Does not set up a command, or touch hardware.
 608  */
 609 static int iwl_mod_ht40_chan_info(struct iwl_priv *priv,
 610                               enum ieee80211_band band, u16 channel,
 611                               const struct iwl_eeprom_channel *eeprom_ch,
 612                               u8 clear_ht40_extension_channel)
 613 {
 614         struct iwl_channel_info *ch_info;
 615
 616         ch_info = (struct iwl_channel_info *)
 617                         iwl_get_channel_info(priv, band, channel);
 618
 619         if (!is_channel_valid(ch_info))
 620                 return -1;
 621
 622         IWL_DEBUG_EEPROM(priv, "HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
 623                         " Ad-Hoc %ssupported\n",
 624                         ch_info->channel,
 625                         is_channel_a_band(ch_info) ?
 626                         "5.2" : "2.4",
 627                         CHECK_AND_PRINT(IBSS),
 628                         CHECK_AND_PRINT(ACTIVE),
 629                         CHECK_AND_PRINT(RADAR),
 630                         CHECK_AND_PRINT(WIDE),
 631                         CHECK_AND_PRINT(DFS),
 632                         eeprom_ch->flags,
 633                         eeprom_ch->max_power_avg,
 634                         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
 635                          && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
 636                         "" : "not ");
 637
 638         ch_info->ht40_eeprom = *eeprom_ch;
 639         ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
 640         ch_info->ht40_flags = eeprom_ch->flags;
 641         if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
 642                 ch_info->ht40_extension_channel &= ~clear_ht40_extension_channel;
 643
 644         return 0;
 645 }
 646
 647 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
 648                             ? # x " " : "")
 649
 650 /**
 651  * iwl_init_channel_map - Set up driver's info for all possible channels
 652  */
 653 int iwl_init_channel_map(struct iwl_priv *priv)
 654 {
 655         int eeprom_ch_count = 0;
 656         const u8 *eeprom_ch_index = NULL;
 657         const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
 658         int band, ch;
 659         struct iwl_channel_info *ch_info;
 660
 661         if (priv->channel_count) {
 662                 IWL_DEBUG_EEPROM(priv, "Channel map already initialized.\n");
 663                 return 0;
 664         }
 665
 666         IWL_DEBUG_EEPROM(priv, "Initializing regulatory info from EEPROM\n");
 667
 668         priv->channel_count =
 669             ARRAY_SIZE(iwl_eeprom_band_1) +
 670             ARRAY_SIZE(iwl_eeprom_band_2) +
 671             ARRAY_SIZE(iwl_eeprom_band_3) +
 672             ARRAY_SIZE(iwl_eeprom_band_4) +
 673             ARRAY_SIZE(iwl_eeprom_band_5);
 674
 675         IWL_DEBUG_EEPROM(priv, "Parsing data for %d channels.\n",
 676                         priv->channel_count);
 677
 678         priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
 679                                      priv->channel_count, GFP_KERNEL);
 680         if (!priv->channel_info) {
 681                 IWL_ERR(priv, "Could not allocate channel_info\n");
 682                 priv->channel_count = 0;
 683                 return -ENOMEM;
 684         }
 685
 686         ch_info = priv->channel_info;
 687
 688         /* Loop through the 5 EEPROM bands adding them in order to the
 689          * channel map we maintain (that contains additional information than
 690          * what just in the EEPROM) */
 691         for (band = 1; band <= 5; band++) {
 692
 693                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
 694                                         &eeprom_ch_info, &eeprom_ch_index);
 695
 696                 /* Loop through each band adding each of the channels */
 697                 for (ch = 0; ch < eeprom_ch_count; ch++) {
 698                         ch_info->channel = eeprom_ch_index[ch];
 699                         ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
 700                             IEEE80211_BAND_5GHZ;
 701
 702                         /* permanently store EEPROM's channel regulatory flags
 703                          *   and max power in channel info database. */
 704                         ch_info->eeprom = eeprom_ch_info[ch];
 705
 706                         /* Copy the run-time flags so they are there even on
 707                          * invalid channels */
 708                         ch_info->flags = eeprom_ch_info[ch].flags;
 709                         /* First write that ht40 is not enabled, and then enable
 710                          * one by one */
 711                         ch_info->ht40_extension_channel =
 712                                         IEEE80211_CHAN_NO_HT40;
 713
 714                         if (!(is_channel_valid(ch_info))) {
 715                                 IWL_DEBUG_EEPROM(priv,
 716                                                "Ch. %d Flags %x [%sGHz] - "
 717                                                "No traffic\n",
 718                                                ch_info->channel,
 719                                                ch_info->flags,
 720                                                is_channel_a_band(ch_info) ?
 721                                                "5.2" : "2.4");
 722                                 ch_info++;
 723                                 continue;
 724                         }
 725
 726                         /* Initialize regulatory-based run-time data */
 727                         ch_info->max_power_avg = ch_info->curr_txpow =
 728                             eeprom_ch_info[ch].max_power_avg;
 729                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
 730                         ch_info->min_power = 0;
 731
 732                         IWL_DEBUG_EEPROM(priv, "Ch. %d [%sGHz] "
 733                                        "%s%s%s%s%s%s(0x%02x %ddBm):"
 734                                        " Ad-Hoc %ssupported\n",
 735                                        ch_info->channel,
 736                                        is_channel_a_band(ch_info) ?
 737                                        "5.2" : "2.4",
 738                                        CHECK_AND_PRINT_I(VALID),
 739                                        CHECK_AND_PRINT_I(IBSS),
 740                                        CHECK_AND_PRINT_I(ACTIVE),
 741                                        CHECK_AND_PRINT_I(RADAR),
 742                                        CHECK_AND_PRINT_I(WIDE),
 743                                        CHECK_AND_PRINT_I(DFS),
 744                                        eeprom_ch_info[ch].flags,
 745                                        eeprom_ch_info[ch].max_power_avg,
 746                                        ((eeprom_ch_info[ch].
 747                                          flags & EEPROM_CHANNEL_IBSS)
 748                                         && !(eeprom_ch_info[ch].
 749                                              flags & EEPROM_CHANNEL_RADAR))
 750                                        ? "" : "not ");
 751
 752                         ch_info++;
 753                 }
 754         }
 755
 756         /* Check if we do have HT40 channels */
 757         if (priv->cfg->ops->lib->eeprom_ops.regulatory_bands[5] ==
 758             EEPROM_REGULATORY_BAND_NO_HT40 &&
 759             priv->cfg->ops->lib->eeprom_ops.regulatory_bands[6] ==
 760             EEPROM_REGULATORY_BAND_NO_HT40)
 761                 return 0;
 762
 763         /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
 764         for (band = 6; band <= 7; band++) {
 765                 enum ieee80211_band ieeeband;
 766
 767                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
 768                                         &eeprom_ch_info, &eeprom_ch_index);
 769
 770                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
 771                 ieeeband =
 772                         (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
 773
 774                 /* Loop through each band adding each of the channels */
 775                 for (ch = 0; ch < eeprom_ch_count; ch++) {
 776                         /* Set up driver's info for lower half */
 777                         iwl_mod_ht40_chan_info(priv, ieeeband,
 778                                                 eeprom_ch_index[ch],
 779                                                 &eeprom_ch_info[ch],
 780                                                 IEEE80211_CHAN_NO_HT40PLUS);
 781
 782                         /* Set up driver's info for upper half */
 783                         iwl_mod_ht40_chan_info(priv, ieeeband,
 784                                                 eeprom_ch_index[ch] + 4,
 785                                                 &eeprom_ch_info[ch],
 786                                                 IEEE80211_CHAN_NO_HT40MINUS);
 787                 }
 788         }
 789
 790         /* for newer device (6000 series and up)
 791          * EEPROM contain enhanced tx power information
 792          * driver need to process addition information
 793          * to determine the max channel tx power limits
 794          */
 795         if (priv->cfg->ops->lib->eeprom_ops.update_enhanced_txpower)
 796                 priv->cfg->ops->lib->eeprom_ops.update_enhanced_txpower(priv);
 797
 798         return 0;
 799 }
 800
 801 /*
 802  * iwl_free_channel_map - undo allocations in iwl_init_channel_map
 803  */
 804 void iwl_free_channel_map(struct iwl_priv *priv)
 805 {
 806         kfree(priv->channel_info);
 807         priv->channel_count = 0;
 808 }
 809
 810 /**
 811  * iwl_get_channel_info - Find driver's private channel info
 812  *
 813  * Based on band and channel number.
 814  */
 815 const struct iwl_channel_info *iwl_get_channel_info(const struct iwl_priv *priv,
 816                                         enum ieee80211_band band, u16 channel)
 817 {
 818         int i;
 819
 820         switch (band) {
 821         case IEEE80211_BAND_5GHZ:
 822                 for (i = 14; i < priv->channel_count; i++) {
 823                         if (priv->channel_info[i].channel == channel)
 824                                 return &priv->channel_info[i];
 825                 }
 826                 break;
 827         case IEEE80211_BAND_2GHZ:
 828                 if (channel >= 1 && channel <= 14)
 829                         return &priv->channel_info[channel - 1];
 830                 break;
 831         default:
 832                 BUG();
 833         }
 834
 835         return NULL;
 836 }