root/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c

DEFINITIONS

1. iwl_nvm_write_chunk
2. iwl_nvm_read_chunk
3. iwl_nvm_write_section
4. iwl_nvm_read_section
5. iwl_parse_nvm_sections
6. iwl_mvm_load_nvm_to_nic
7. iwl_nvm_init
8. iwl_mvm_update_mcc
9. iwl_mvm_init_mcc
10. iwl_mvm_rx_chub_update_mcc

   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) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  11  * Copyright(c) 2018        Intel Corporation
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of version 2 of the GNU General Public License as
  15  * published by the Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * The full GNU General Public License is included in this distribution
  23  * in the file called COPYING.
  24  *
  25  * Contact Information:
  26  *  Intel Linux Wireless <linuxwifi@intel.com>
  27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28  *
  29  * BSD LICENSE
  30  *
  31  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  32  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  33  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  34  * Copyright(c) 2018        Intel Corporation
  35  * All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  *
  41  *  * Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  *  * Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in
  45  *    the documentation and/or other materials provided with the
  46  *    distribution.
  47  *  * Neither the name Intel Corporation nor the names of its
  48  *    contributors may be used to endorse or promote products derived
  49  *    from this software without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  52  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  53  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  54  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  55  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  56  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  57  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  59  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  61  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  *****************************************************************************/
  64 #include <linux/firmware.h>
  65 #include <linux/rtnetlink.h>
  66 #include "iwl-trans.h"
  67 #include "iwl-csr.h"
  68 #include "mvm.h"
  69 #include "iwl-eeprom-parse.h"
  70 #include "iwl-eeprom-read.h"
  71 #include "iwl-nvm-parse.h"
  72 #include "iwl-prph.h"
  73 #include "fw/acpi.h"
  74 
  75 /* Default NVM size to read */
  76 #define IWL_NVM_DEFAULT_CHUNK_SIZE (2 * 1024)
  77 
  78 #define NVM_WRITE_OPCODE 1
  79 #define NVM_READ_OPCODE 0
  80 
  81 /* load nvm chunk response */
  82 enum {
  83         READ_NVM_CHUNK_SUCCEED = 0,
  84         READ_NVM_CHUNK_NOT_VALID_ADDRESS = 1
  85 };
  86 
  87 /*
  88  * prepare the NVM host command w/ the pointers to the nvm buffer
  89  * and send it to fw
  90  */
  91 static int iwl_nvm_write_chunk(struct iwl_mvm *mvm, u16 section,
  92                                u16 offset, u16 length, const u8 *data)
  93 {
  94         struct iwl_nvm_access_cmd nvm_access_cmd = {
  95                 .offset = cpu_to_le16(offset),
  96                 .length = cpu_to_le16(length),
  97                 .type = cpu_to_le16(section),
  98                 .op_code = NVM_WRITE_OPCODE,
  99         };
 100         struct iwl_host_cmd cmd = {
 101                 .id = NVM_ACCESS_CMD,
 102                 .len = { sizeof(struct iwl_nvm_access_cmd), length },
 103                 .flags = CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
 104                 .data = { &nvm_access_cmd, data },
 105                 /* data may come from vmalloc, so use _DUP */
 106                 .dataflags = { 0, IWL_HCMD_DFL_DUP },
 107         };
 108         struct iwl_rx_packet *pkt;
 109         struct iwl_nvm_access_resp *nvm_resp;
 110         int ret;
 111 
 112         ret = iwl_mvm_send_cmd(mvm, &cmd);
 113         if (ret)
 114                 return ret;
 115 
 116         pkt = cmd.resp_pkt;
 117         /* Extract & check NVM write response */
 118         nvm_resp = (void *)pkt->data;
 119         if (le16_to_cpu(nvm_resp->status) != READ_NVM_CHUNK_SUCCEED) {
 120                 IWL_ERR(mvm,
 121                         "NVM access write command failed for section %u (status = 0x%x)\n",
 122                         section, le16_to_cpu(nvm_resp->status));
 123                 ret = -EIO;
 124         }
 125 
 126         iwl_free_resp(&cmd);
 127         return ret;
 128 }
 129 
 130 static int iwl_nvm_read_chunk(struct iwl_mvm *mvm, u16 section,
 131                               u16 offset, u16 length, u8 *data)
 132 {
 133         struct iwl_nvm_access_cmd nvm_access_cmd = {
 134                 .offset = cpu_to_le16(offset),
 135                 .length = cpu_to_le16(length),
 136                 .type = cpu_to_le16(section),
 137                 .op_code = NVM_READ_OPCODE,
 138         };
 139         struct iwl_nvm_access_resp *nvm_resp;
 140         struct iwl_rx_packet *pkt;
 141         struct iwl_host_cmd cmd = {
 142                 .id = NVM_ACCESS_CMD,
 143                 .flags = CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
 144                 .data = { &nvm_access_cmd, },
 145         };
 146         int ret, bytes_read, offset_read;
 147         u8 *resp_data;
 148 
 149         cmd.len[0] = sizeof(struct iwl_nvm_access_cmd);
 150 
 151         ret = iwl_mvm_send_cmd(mvm, &cmd);
 152         if (ret)
 153                 return ret;
 154 
 155         pkt = cmd.resp_pkt;
 156 
 157         /* Extract NVM response */
 158         nvm_resp = (void *)pkt->data;
 159         ret = le16_to_cpu(nvm_resp->status);
 160         bytes_read = le16_to_cpu(nvm_resp->length);
 161         offset_read = le16_to_cpu(nvm_resp->offset);
 162         resp_data = nvm_resp->data;
 163         if (ret) {
 164                 if ((offset != 0) &&
 165                     (ret == READ_NVM_CHUNK_NOT_VALID_ADDRESS)) {
 166                         /*
 167                          * meaning of NOT_VALID_ADDRESS:
 168                          * driver try to read chunk from address that is
 169                          * multiple of 2K and got an error since addr is empty.
 170                          * meaning of (offset != 0): driver already
 171                          * read valid data from another chunk so this case
 172                          * is not an error.
 173                          */
 174                         IWL_DEBUG_EEPROM(mvm->trans->dev,
 175                                          "NVM access command failed on offset 0x%x since that section size is multiple 2K\n",
 176                                          offset);
 177                         ret = 0;
 178                 } else {
 179                         IWL_DEBUG_EEPROM(mvm->trans->dev,
 180                                          "NVM access command failed with status %d (device: %s)\n",
 181                                          ret, mvm->cfg->name);
 182                         ret = -ENODATA;
 183                 }
 184                 goto exit;
 185         }
 186 
 187         if (offset_read != offset) {
 188                 IWL_ERR(mvm, "NVM ACCESS response with invalid offset %d\n",
 189                         offset_read);
 190                 ret = -EINVAL;
 191                 goto exit;
 192         }
 193 
 194         /* Write data to NVM */
 195         memcpy(data + offset, resp_data, bytes_read);
 196         ret = bytes_read;
 197 
 198 exit:
 199         iwl_free_resp(&cmd);
 200         return ret;
 201 }
 202 
 203 static int iwl_nvm_write_section(struct iwl_mvm *mvm, u16 section,
 204                                  const u8 *data, u16 length)
 205 {
 206         int offset = 0;
 207 
 208         /* copy data in chunks of 2k (and remainder if any) */
 209 
 210         while (offset < length) {
 211                 int chunk_size, ret;
 212 
 213                 chunk_size = min(IWL_NVM_DEFAULT_CHUNK_SIZE,
 214                                  length - offset);
 215 
 216                 ret = iwl_nvm_write_chunk(mvm, section, offset,
 217                                           chunk_size, data + offset);
 218                 if (ret < 0)
 219                         return ret;
 220 
 221                 offset += chunk_size;
 222         }
 223 
 224         return 0;
 225 }
 226 
 227 /*
 228  * Reads an NVM section completely.
 229  * NICs prior to 7000 family doesn't have a real NVM, but just read
 230  * section 0 which is the EEPROM. Because the EEPROM reading is unlimited
 231  * by uCode, we need to manually check in this case that we don't
 232  * overflow and try to read more than the EEPROM size.
 233  * For 7000 family NICs, we supply the maximal size we can read, and
 234  * the uCode fills the response with as much data as we can,
 235  * without overflowing, so no check is needed.
 236  */
 237 static int iwl_nvm_read_section(struct iwl_mvm *mvm, u16 section,
 238                                 u8 *data, u32 size_read)
 239 {
 240         u16 length, offset = 0;
 241         int ret;
 242 
 243         /* Set nvm section read length */
 244         length = IWL_NVM_DEFAULT_CHUNK_SIZE;
 245 
 246         ret = length;
 247 
 248         /* Read the NVM until exhausted (reading less than requested) */
 249         while (ret == length) {
 250                 /* Check no memory assumptions fail and cause an overflow */
 251                 if ((size_read + offset + length) >
 252                     mvm->trans->trans_cfg->base_params->eeprom_size) {
 253                         IWL_ERR(mvm, "EEPROM size is too small for NVM\n");
 254                         return -ENOBUFS;
 255                 }
 256 
 257                 ret = iwl_nvm_read_chunk(mvm, section, offset, length, data);
 258                 if (ret < 0) {
 259                         IWL_DEBUG_EEPROM(mvm->trans->dev,
 260                                          "Cannot read NVM from section %d offset %d, length %d\n",
 261                                          section, offset, length);
 262                         return ret;
 263                 }
 264                 offset += ret;
 265         }
 266 
 267         iwl_nvm_fixups(mvm->trans->hw_id, section, data, offset);
 268 
 269         IWL_DEBUG_EEPROM(mvm->trans->dev,
 270                          "NVM section %d read completed\n", section);
 271         return offset;
 272 }
 273 
 274 static struct iwl_nvm_data *
 275 iwl_parse_nvm_sections(struct iwl_mvm *mvm)
 276 {
 277         struct iwl_nvm_section *sections = mvm->nvm_sections;
 278         const __be16 *hw;
 279         const __le16 *sw, *calib, *regulatory, *mac_override, *phy_sku;
 280         bool lar_enabled;
 281         int regulatory_type;
 282 
 283         /* Checking for required sections */
 284         if (mvm->trans->cfg->nvm_type == IWL_NVM) {
 285                 if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
 286                     !mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data) {
 287                         IWL_ERR(mvm, "Can't parse empty OTP/NVM sections\n");
 288                         return NULL;
 289                 }
 290         } else {
 291                 if (mvm->trans->cfg->nvm_type == IWL_NVM_SDP)
 292                         regulatory_type = NVM_SECTION_TYPE_REGULATORY_SDP;
 293                 else
 294                         regulatory_type = NVM_SECTION_TYPE_REGULATORY;
 295 
 296                 /* SW and REGULATORY sections are mandatory */
 297                 if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
 298                     !mvm->nvm_sections[regulatory_type].data) {
 299                         IWL_ERR(mvm,
 300                                 "Can't parse empty family 8000 OTP/NVM sections\n");
 301                         return NULL;
 302                 }
 303                 /* MAC_OVERRIDE or at least HW section must exist */
 304                 if (!mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data &&
 305                     !mvm->nvm_sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data) {
 306                         IWL_ERR(mvm,
 307                                 "Can't parse mac_address, empty sections\n");
 308                         return NULL;
 309                 }
 310 
 311                 /* PHY_SKU section is mandatory in B0 */
 312                 if (mvm->trans->cfg->nvm_type == IWL_NVM_EXT &&
 313                     !mvm->nvm_sections[NVM_SECTION_TYPE_PHY_SKU].data) {
 314                         IWL_ERR(mvm,
 315                                 "Can't parse phy_sku in B0, empty sections\n");
 316                         return NULL;
 317                 }
 318         }
 319 
 320         hw = (const __be16 *)sections[mvm->cfg->nvm_hw_section_num].data;
 321         sw = (const __le16 *)sections[NVM_SECTION_TYPE_SW].data;
 322         calib = (const __le16 *)sections[NVM_SECTION_TYPE_CALIBRATION].data;
 323         mac_override =
 324                 (const __le16 *)sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data;
 325         phy_sku = (const __le16 *)sections[NVM_SECTION_TYPE_PHY_SKU].data;
 326 
 327         regulatory = mvm->trans->cfg->nvm_type == IWL_NVM_SDP ?
 328                 (const __le16 *)sections[NVM_SECTION_TYPE_REGULATORY_SDP].data :
 329                 (const __le16 *)sections[NVM_SECTION_TYPE_REGULATORY].data;
 330 
 331         lar_enabled = !iwlwifi_mod_params.lar_disable &&
 332                       fw_has_capa(&mvm->fw->ucode_capa,
 333                                   IWL_UCODE_TLV_CAPA_LAR_SUPPORT);
 334 
 335         return iwl_parse_nvm_data(mvm->trans, mvm->cfg, hw, sw, calib,
 336                                   regulatory, mac_override, phy_sku,
 337                                   mvm->fw->valid_tx_ant, mvm->fw->valid_rx_ant,
 338                                   lar_enabled);
 339 }
 340 
 341 /* Loads the NVM data stored in mvm->nvm_sections into the NIC */
 342 int iwl_mvm_load_nvm_to_nic(struct iwl_mvm *mvm)
 343 {
 344         int i, ret = 0;
 345         struct iwl_nvm_section *sections = mvm->nvm_sections;
 346 
 347         IWL_DEBUG_EEPROM(mvm->trans->dev, "'Write to NVM\n");
 348 
 349         for (i = 0; i < ARRAY_SIZE(mvm->nvm_sections); i++) {
 350                 if (!mvm->nvm_sections[i].data || !mvm->nvm_sections[i].length)
 351                         continue;
 352                 ret = iwl_nvm_write_section(mvm, i, sections[i].data,
 353                                             sections[i].length);
 354                 if (ret < 0) {
 355                         IWL_ERR(mvm, "iwl_mvm_send_cmd failed: %d\n", ret);
 356                         break;
 357                 }
 358         }
 359         return ret;
 360 }
 361 
 362 int iwl_nvm_init(struct iwl_mvm *mvm)
 363 {
 364         int ret, section;
 365         u32 size_read = 0;
 366         u8 *nvm_buffer, *temp;
 367         const char *nvm_file_C = mvm->cfg->default_nvm_file_C_step;
 368 
 369         if (WARN_ON_ONCE(mvm->cfg->nvm_hw_section_num >= NVM_MAX_NUM_SECTIONS))
 370                 return -EINVAL;
 371 
 372         /* load NVM values from nic */
 373         /* Read From FW NVM */
 374         IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from NVM\n");
 375 
 376         nvm_buffer = kmalloc(mvm->trans->trans_cfg->base_params->eeprom_size,
 377                              GFP_KERNEL);
 378         if (!nvm_buffer)
 379                 return -ENOMEM;
 380         for (section = 0; section < NVM_MAX_NUM_SECTIONS; section++) {
 381                 /* we override the constness for initial read */
 382                 ret = iwl_nvm_read_section(mvm, section, nvm_buffer,
 383                                            size_read);
 384                 if (ret == -ENODATA) {
 385                         ret = 0;
 386                         continue;
 387                 }
 388                 if (ret < 0)
 389                         break;
 390                 size_read += ret;
 391                 temp = kmemdup(nvm_buffer, ret, GFP_KERNEL);
 392                 if (!temp) {
 393                         ret = -ENOMEM;
 394                         break;
 395                 }
 396 
 397                 iwl_nvm_fixups(mvm->trans->hw_id, section, temp, ret);
 398 
 399                 mvm->nvm_sections[section].data = temp;
 400                 mvm->nvm_sections[section].length = ret;
 401 
 402 #ifdef CONFIG_IWLWIFI_DEBUGFS
 403                 switch (section) {
 404                 case NVM_SECTION_TYPE_SW:
 405                         mvm->nvm_sw_blob.data = temp;
 406                         mvm->nvm_sw_blob.size  = ret;
 407                         break;
 408                 case NVM_SECTION_TYPE_CALIBRATION:
 409                         mvm->nvm_calib_blob.data = temp;
 410                         mvm->nvm_calib_blob.size  = ret;
 411                         break;
 412                 case NVM_SECTION_TYPE_PRODUCTION:
 413                         mvm->nvm_prod_blob.data = temp;
 414                         mvm->nvm_prod_blob.size  = ret;
 415                         break;
 416                 case NVM_SECTION_TYPE_PHY_SKU:
 417                         mvm->nvm_phy_sku_blob.data = temp;
 418                         mvm->nvm_phy_sku_blob.size  = ret;
 419                         break;
 420                 case NVM_SECTION_TYPE_REGULATORY_SDP:
 421                 case NVM_SECTION_TYPE_REGULATORY:
 422                         mvm->nvm_reg_blob.data = temp;
 423                         mvm->nvm_reg_blob.size  = ret;
 424                         break;
 425                 default:
 426                         if (section == mvm->cfg->nvm_hw_section_num) {
 427                                 mvm->nvm_hw_blob.data = temp;
 428                                 mvm->nvm_hw_blob.size = ret;
 429                                 break;
 430                         }
 431                 }
 432 #endif
 433         }
 434         if (!size_read)
 435                 IWL_ERR(mvm, "OTP is blank\n");
 436         kfree(nvm_buffer);
 437 
 438         /* Only if PNVM selected in the mod param - load external NVM  */
 439         if (mvm->nvm_file_name) {
 440                 /* read External NVM file from the mod param */
 441                 ret = iwl_read_external_nvm(mvm->trans, mvm->nvm_file_name,
 442                                             mvm->nvm_sections);
 443                 if (ret) {
 444                         mvm->nvm_file_name = nvm_file_C;
 445 
 446                         if ((ret == -EFAULT || ret == -ENOENT) &&
 447                             mvm->nvm_file_name) {
 448                                 /* in case nvm file was failed try again */
 449                                 ret = iwl_read_external_nvm(mvm->trans,
 450                                                             mvm->nvm_file_name,
 451                                                             mvm->nvm_sections);
 452                                 if (ret)
 453                                         return ret;
 454                         } else {
 455                                 return ret;
 456                         }
 457                 }
 458         }
 459 
 460         /* parse the relevant nvm sections */
 461         mvm->nvm_data = iwl_parse_nvm_sections(mvm);
 462         if (!mvm->nvm_data)
 463                 return -ENODATA;
 464         IWL_DEBUG_EEPROM(mvm->trans->dev, "nvm version = %x\n",
 465                          mvm->nvm_data->nvm_version);
 466 
 467         return ret < 0 ? ret : 0;
 468 }
 469 
 470 struct iwl_mcc_update_resp *
 471 iwl_mvm_update_mcc(struct iwl_mvm *mvm, const char *alpha2,
 472                    enum iwl_mcc_source src_id)
 473 {
 474         struct iwl_mcc_update_cmd mcc_update_cmd = {
 475                 .mcc = cpu_to_le16(alpha2[0] << 8 | alpha2[1]),
 476                 .source_id = (u8)src_id,
 477         };
 478         struct iwl_mcc_update_resp *resp_cp;
 479         struct iwl_rx_packet *pkt;
 480         struct iwl_host_cmd cmd = {
 481                 .id = MCC_UPDATE_CMD,
 482                 .flags = CMD_WANT_SKB,
 483                 .data = { &mcc_update_cmd },
 484         };
 485 
 486         int ret;
 487         u32 status;
 488         int resp_len, n_channels;
 489         u16 mcc;
 490 
 491         if (WARN_ON_ONCE(!iwl_mvm_is_lar_supported(mvm)))
 492                 return ERR_PTR(-EOPNOTSUPP);
 493 
 494         cmd.len[0] = sizeof(struct iwl_mcc_update_cmd);
 495 
 496         IWL_DEBUG_LAR(mvm, "send MCC update to FW with '%c%c' src = %d\n",
 497                       alpha2[0], alpha2[1], src_id);
 498 
 499         ret = iwl_mvm_send_cmd(mvm, &cmd);
 500         if (ret)
 501                 return ERR_PTR(ret);
 502 
 503         pkt = cmd.resp_pkt;
 504 
 505         /* Extract MCC response */
 506         if (fw_has_capa(&mvm->fw->ucode_capa,
 507                         IWL_UCODE_TLV_CAPA_MCC_UPDATE_11AX_SUPPORT)) {
 508                 struct iwl_mcc_update_resp *mcc_resp = (void *)pkt->data;
 509 
 510                 n_channels =  __le32_to_cpu(mcc_resp->n_channels);
 511                 resp_len = sizeof(struct iwl_mcc_update_resp) +
 512                            n_channels * sizeof(__le32);
 513                 resp_cp = kmemdup(mcc_resp, resp_len, GFP_KERNEL);
 514                 if (!resp_cp) {
 515                         resp_cp = ERR_PTR(-ENOMEM);
 516                         goto exit;
 517                 }
 518         } else {
 519                 struct iwl_mcc_update_resp_v3 *mcc_resp_v3 = (void *)pkt->data;
 520 
 521                 n_channels =  __le32_to_cpu(mcc_resp_v3->n_channels);
 522                 resp_len = sizeof(struct iwl_mcc_update_resp) +
 523                            n_channels * sizeof(__le32);
 524                 resp_cp = kzalloc(resp_len, GFP_KERNEL);
 525                 if (!resp_cp) {
 526                         resp_cp = ERR_PTR(-ENOMEM);
 527                         goto exit;
 528                 }
 529 
 530                 resp_cp->status = mcc_resp_v3->status;
 531                 resp_cp->mcc = mcc_resp_v3->mcc;
 532                 resp_cp->cap = cpu_to_le16(mcc_resp_v3->cap);
 533                 resp_cp->source_id = mcc_resp_v3->source_id;
 534                 resp_cp->time = mcc_resp_v3->time;
 535                 resp_cp->geo_info = mcc_resp_v3->geo_info;
 536                 resp_cp->n_channels = mcc_resp_v3->n_channels;
 537                 memcpy(resp_cp->channels, mcc_resp_v3->channels,
 538                        n_channels * sizeof(__le32));
 539         }
 540 
 541         status = le32_to_cpu(resp_cp->status);
 542 
 543         mcc = le16_to_cpu(resp_cp->mcc);
 544 
 545         /* W/A for a FW/NVM issue - returns 0x00 for the world domain */
 546         if (mcc == 0) {
 547                 mcc = 0x3030;  /* "00" - world */
 548                 resp_cp->mcc = cpu_to_le16(mcc);
 549         }
 550 
 551         IWL_DEBUG_LAR(mvm,
 552                       "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') n_chans: %d\n",
 553                       status, mcc, mcc >> 8, mcc & 0xff, n_channels);
 554 
 555 exit:
 556         iwl_free_resp(&cmd);
 557         return resp_cp;
 558 }
 559 
 560 int iwl_mvm_init_mcc(struct iwl_mvm *mvm)
 561 {
 562         bool tlv_lar;
 563         bool nvm_lar;
 564         int retval;
 565         struct ieee80211_regdomain *regd;
 566         char mcc[3];
 567 
 568         if (mvm->cfg->nvm_type == IWL_NVM_EXT) {
 569                 tlv_lar = fw_has_capa(&mvm->fw->ucode_capa,
 570                                       IWL_UCODE_TLV_CAPA_LAR_SUPPORT);
 571                 nvm_lar = mvm->nvm_data->lar_enabled;
 572                 if (tlv_lar != nvm_lar)
 573                         IWL_INFO(mvm,
 574                                  "Conflict between TLV & NVM regarding enabling LAR (TLV = %s NVM =%s)\n",
 575                                  tlv_lar ? "enabled" : "disabled",
 576                                  nvm_lar ? "enabled" : "disabled");
 577         }
 578 
 579         if (!iwl_mvm_is_lar_supported(mvm))
 580                 return 0;
 581 
 582         /*
 583          * try to replay the last set MCC to FW. If it doesn't exist,
 584          * queue an update to cfg80211 to retrieve the default alpha2 from FW.
 585          */
 586         retval = iwl_mvm_init_fw_regd(mvm);
 587         if (retval != -ENOENT)
 588                 return retval;
 589 
 590         /*
 591          * Driver regulatory hint for initial update, this also informs the
 592          * firmware we support wifi location updates.
 593          * Disallow scans that might crash the FW while the LAR regdomain
 594          * is not set.
 595          */
 596         mvm->lar_regdom_set = false;
 597 
 598         regd = iwl_mvm_get_current_regdomain(mvm, NULL);
 599         if (IS_ERR_OR_NULL(regd))
 600                 return -EIO;
 601 
 602         if (iwl_mvm_is_wifi_mcc_supported(mvm) &&
 603             !iwl_acpi_get_mcc(mvm->dev, mcc)) {
 604                 kfree(regd);
 605                 regd = iwl_mvm_get_regdomain(mvm->hw->wiphy, mcc,
 606                                              MCC_SOURCE_BIOS, NULL);
 607                 if (IS_ERR_OR_NULL(regd))
 608                         return -EIO;
 609         }
 610 
 611         retval = regulatory_set_wiphy_regd_sync_rtnl(mvm->hw->wiphy, regd);
 612         kfree(regd);
 613         return retval;
 614 }
 615 
 616 void iwl_mvm_rx_chub_update_mcc(struct iwl_mvm *mvm,
 617                                 struct iwl_rx_cmd_buffer *rxb)
 618 {
 619         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 620         struct iwl_mcc_chub_notif *notif = (void *)pkt->data;
 621         enum iwl_mcc_source src;
 622         char mcc[3];
 623         struct ieee80211_regdomain *regd;
 624         int wgds_tbl_idx;
 625 
 626         lockdep_assert_held(&mvm->mutex);
 627 
 628         if (iwl_mvm_is_vif_assoc(mvm) && notif->source_id == MCC_SOURCE_WIFI) {
 629                 IWL_DEBUG_LAR(mvm, "Ignore mcc update while associated\n");
 630                 return;
 631         }
 632 
 633         if (WARN_ON_ONCE(!iwl_mvm_is_lar_supported(mvm)))
 634                 return;
 635 
 636         mcc[0] = le16_to_cpu(notif->mcc) >> 8;
 637         mcc[1] = le16_to_cpu(notif->mcc) & 0xff;
 638         mcc[2] = '\0';
 639         src = notif->source_id;
 640 
 641         IWL_DEBUG_LAR(mvm,
 642                       "RX: received chub update mcc cmd (mcc '%s' src %d)\n",
 643                       mcc, src);
 644         regd = iwl_mvm_get_regdomain(mvm->hw->wiphy, mcc, src, NULL);
 645         if (IS_ERR_OR_NULL(regd))
 646                 return;
 647 
 648         wgds_tbl_idx = iwl_mvm_get_sar_geo_profile(mvm);
 649         if (wgds_tbl_idx < 0)
 650                 IWL_DEBUG_INFO(mvm, "SAR WGDS is disabled (%d)\n",
 651                                wgds_tbl_idx);
 652         else
 653                 IWL_DEBUG_INFO(mvm, "SAR WGDS: geo profile %d is configured\n",
 654                                wgds_tbl_idx);
 655 
 656         regulatory_set_wiphy_regd(mvm->hw->wiphy, regd);
 657         kfree(regd);
 658 }