drivers/net/wireless/iwlwifi/mvm/nvm.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) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  23  * USA
  24  *
  25  * The full GNU General Public License is included in this distribution
  26  * in the file called COPYING.
  27  *
  28  * Contact Information:
  29  *  Intel Linux Wireless <ilw@linux.intel.com>
  30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  31  *
  32  * BSD LICENSE
  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  36  * All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  *
  42  *  * Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  *  * Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in
  46  *    the documentation and/or other materials provided with the
  47  *    distribution.
  48  *  * Neither the name Intel Corporation nor the names of its
  49  *    contributors may be used to endorse or promote products derived
  50  *    from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  57  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  58  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  59  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  60  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  61  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  63  *
  64  *****************************************************************************/
  65 #include <linux/firmware.h>
  66 #include <linux/rtnetlink.h>
  67 #include "iwl-trans.h"
  68 #include "iwl-csr.h"
  69 #include "mvm.h"
  70 #include "iwl-eeprom-parse.h"
  71 #include "iwl-eeprom-read.h"
  72 #include "iwl-nvm-parse.h"
  73
  74 /* Default NVM size to read */
  75 #define IWL_NVM_DEFAULT_CHUNK_SIZE (2*1024)
  76 #define IWL_MAX_NVM_SECTION_SIZE        0x1b58
  77 #define IWL_MAX_NVM_8000A_SECTION_SIZE  0xffc
  78 #define IWL_MAX_NVM_8000B_SECTION_SIZE  0x1ffc
  79
  80 #define NVM_WRITE_OPCODE 1
  81 #define NVM_READ_OPCODE 0
  82
  83 /* load nvm chunk response */
  84 enum {
  85         READ_NVM_CHUNK_SUCCEED = 0,
  86         READ_NVM_CHUNK_NOT_VALID_ADDRESS = 1
  87 };
  88
  89 /*
  90  * prepare the NVM host command w/ the pointers to the nvm buffer
  91  * and send it to fw
  92  */
  93 static int iwl_nvm_write_chunk(struct iwl_mvm *mvm, u16 section,
  94                                u16 offset, u16 length, const u8 *data)
  95 {
  96         struct iwl_nvm_access_cmd nvm_access_cmd = {
  97                 .offset = cpu_to_le16(offset),
  98                 .length = cpu_to_le16(length),
  99                 .type = cpu_to_le16(section),
 100                 .op_code = NVM_WRITE_OPCODE,
 101         };
 102         struct iwl_host_cmd cmd = {
 103                 .id = NVM_ACCESS_CMD,
 104                 .len = { sizeof(struct iwl_nvm_access_cmd), length },
 105                 .flags = CMD_SEND_IN_RFKILL,
 106                 .data = { &nvm_access_cmd, data },
 107                 /* data may come from vmalloc, so use _DUP */
 108                 .dataflags = { 0, IWL_HCMD_DFL_DUP },
 109         };
 110
 111         return iwl_mvm_send_cmd(mvm, &cmd);
 112 }
 113
 114 static int iwl_nvm_read_chunk(struct iwl_mvm *mvm, u16 section,
 115                               u16 offset, u16 length, u8 *data)
 116 {
 117         struct iwl_nvm_access_cmd nvm_access_cmd = {
 118                 .offset = cpu_to_le16(offset),
 119                 .length = cpu_to_le16(length),
 120                 .type = cpu_to_le16(section),
 121                 .op_code = NVM_READ_OPCODE,
 122         };
 123         struct iwl_nvm_access_resp *nvm_resp;
 124         struct iwl_rx_packet *pkt;
 125         struct iwl_host_cmd cmd = {
 126                 .id = NVM_ACCESS_CMD,
 127                 .flags = CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
 128                 .data = { &nvm_access_cmd, },
 129         };
 130         int ret, bytes_read, offset_read;
 131         u8 *resp_data;
 132
 133         cmd.len[0] = sizeof(struct iwl_nvm_access_cmd);
 134
 135         ret = iwl_mvm_send_cmd(mvm, &cmd);
 136         if (ret)
 137                 return ret;
 138
 139         pkt = cmd.resp_pkt;
 140         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 141                 IWL_ERR(mvm, "Bad return from NVM_ACCES_COMMAND (0x%08X)\n",
 142                         pkt->hdr.flags);
 143                 ret = -EIO;
 144                 goto exit;
 145         }
 146
 147         /* Extract NVM response */
 148         nvm_resp = (void *)pkt->data;
 149         ret = le16_to_cpu(nvm_resp->status);
 150         bytes_read = le16_to_cpu(nvm_resp->length);
 151         offset_read = le16_to_cpu(nvm_resp->offset);
 152         resp_data = nvm_resp->data;
 153         if (ret) {
 154                 if ((offset != 0) &&
 155                     (ret == READ_NVM_CHUNK_NOT_VALID_ADDRESS)) {
 156                         /*
 157                          * meaning of NOT_VALID_ADDRESS:
 158                          * driver try to read chunk from address that is
 159                          * multiple of 2K and got an error since addr is empty.
 160                          * meaning of (offset != 0): driver already
 161                          * read valid data from another chunk so this case
 162                          * is not an error.
 163                          */
 164                         IWL_DEBUG_EEPROM(mvm->trans->dev,
 165                                          "NVM access command failed on offset 0x%x since that section size is multiple 2K\n",
 166                                          offset);
 167                         ret = 0;
 168                 } else {
 169                         IWL_DEBUG_EEPROM(mvm->trans->dev,
 170                                          "NVM access command failed with status %d (device: %s)\n",
 171                                          ret, mvm->cfg->name);
 172                         ret = -EIO;
 173                 }
 174                 goto exit;
 175         }
 176
 177         if (offset_read != offset) {
 178                 IWL_ERR(mvm, "NVM ACCESS response with invalid offset %d\n",
 179                         offset_read);
 180                 ret = -EINVAL;
 181                 goto exit;
 182         }
 183
 184         /* Write data to NVM */
 185         memcpy(data + offset, resp_data, bytes_read);
 186         ret = bytes_read;
 187
 188 exit:
 189         iwl_free_resp(&cmd);
 190         return ret;
 191 }
 192
 193 static int iwl_nvm_write_section(struct iwl_mvm *mvm, u16 section,
 194                                  const u8 *data, u16 length)
 195 {
 196         int offset = 0;
 197
 198         /* copy data in chunks of 2k (and remainder if any) */
 199
 200         while (offset < length) {
 201                 int chunk_size, ret;
 202
 203                 chunk_size = min(IWL_NVM_DEFAULT_CHUNK_SIZE,
 204                                  length - offset);
 205
 206                 ret = iwl_nvm_write_chunk(mvm, section, offset,
 207                                           chunk_size, data + offset);
 208                 if (ret < 0)
 209                         return ret;
 210
 211                 offset += chunk_size;
 212         }
 213
 214         return 0;
 215 }
 216
 217 /*
 218  * Reads an NVM section completely.
 219  * NICs prior to 7000 family doesn't have a real NVM, but just read
 220  * section 0 which is the EEPROM. Because the EEPROM reading is unlimited
 221  * by uCode, we need to manually check in this case that we don't
 222  * overflow and try to read more than the EEPROM size.
 223  * For 7000 family NICs, we supply the maximal size we can read, and
 224  * the uCode fills the response with as much data as we can,
 225  * without overflowing, so no check is needed.
 226  */
 227 static int iwl_nvm_read_section(struct iwl_mvm *mvm, u16 section,
 228                                 u8 *data, u32 size_read)
 229 {
 230         u16 length, offset = 0;
 231         int ret;
 232
 233         /* Set nvm section read length */
 234         length = IWL_NVM_DEFAULT_CHUNK_SIZE;
 235
 236         ret = length;
 237
 238         /* Read the NVM until exhausted (reading less than requested) */
 239         while (ret == length) {
 240                 /* Check no memory assumptions fail and cause an overflow */
 241                 if ((size_read + offset + length) >
 242                     mvm->cfg->base_params->eeprom_size) {
 243                         IWL_ERR(mvm, "EEPROM size is too small for NVM\n");
 244                         return -ENOBUFS;
 245                 }
 246
 247                 ret = iwl_nvm_read_chunk(mvm, section, offset, length, data);
 248                 if (ret < 0) {
 249                         IWL_DEBUG_EEPROM(mvm->trans->dev,
 250                                          "Cannot read NVM from section %d offset %d, length %d\n",
 251                                          section, offset, length);
 252                         return ret;
 253                 }
 254                 offset += ret;
 255         }
 256
 257         IWL_DEBUG_EEPROM(mvm->trans->dev,
 258                          "NVM section %d read completed\n", section);
 259         return offset;
 260 }
 261
 262 static struct iwl_nvm_data *
 263 iwl_parse_nvm_sections(struct iwl_mvm *mvm)
 264 {
 265         struct iwl_nvm_section *sections = mvm->nvm_sections;
 266         const __le16 *hw, *sw, *calib, *regulatory, *mac_override;
 267
 268         /* Checking for required sections */
 269         if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
 270                 if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
 271                     !mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data) {
 272                         IWL_ERR(mvm, "Can't parse empty OTP/NVM sections\n");
 273                         return NULL;
 274                 }
 275         } else {
 276                 /* SW and REGULATORY sections are mandatory */
 277                 if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
 278                     !mvm->nvm_sections[NVM_SECTION_TYPE_REGULATORY].data) {
 279                         IWL_ERR(mvm,
 280                                 "Can't parse empty family 8000 OTP/NVM sections\n");
 281                         return NULL;
 282                 }
 283                 /* MAC_OVERRIDE or at least HW section must exist */
 284                 if (!mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data &&
 285                     !mvm->nvm_sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data) {
 286                         IWL_ERR(mvm,
 287                                 "Can't parse mac_address, empty sections\n");
 288                         return NULL;
 289                 }
 290         }
 291
 292         if (WARN_ON(!mvm->cfg))
 293                 return NULL;
 294
 295         hw = (const __le16 *)sections[mvm->cfg->nvm_hw_section_num].data;
 296         sw = (const __le16 *)sections[NVM_SECTION_TYPE_SW].data;
 297         calib = (const __le16 *)sections[NVM_SECTION_TYPE_CALIBRATION].data;
 298         regulatory = (const __le16 *)sections[NVM_SECTION_TYPE_REGULATORY].data;
 299         mac_override =
 300                 (const __le16 *)sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data;
 301
 302         return iwl_parse_nvm_data(mvm->trans->dev, mvm->cfg, hw, sw, calib,
 303                                   regulatory, mac_override,
 304                                   mvm->fw->valid_tx_ant,
 305                                   mvm->fw->valid_rx_ant,
 306                                   mvm->fw->ucode_capa.capa[0] &
 307                                   IWL_UCODE_TLV_CAPA_LAR_SUPPORT);
 308 }
 309
 310 #define MAX_NVM_FILE_LEN        16384
 311
 312 /*
 313  * Reads external NVM from a file into mvm->nvm_sections
 314  *
 315  * HOW TO CREATE THE NVM FILE FORMAT:
 316  * ------------------------------
 317  * 1. create hex file, format:
 318  *      3800 -> header
 319  *      0000 -> header
 320  *      5a40 -> data
 321  *
 322  *   rev - 6 bit (word1)
 323  *   len - 10 bit (word1)
 324  *   id - 4 bit (word2)
 325  *   rsv - 12 bit (word2)
 326  *
 327  * 2. flip 8bits with 8 bits per line to get the right NVM file format
 328  *
 329  * 3. create binary file from the hex file
 330  *
 331  * 4. save as "iNVM_xxx.bin" under /lib/firmware
 332  */
 333 static int iwl_mvm_read_external_nvm(struct iwl_mvm *mvm)
 334 {
 335         int ret, section_size;
 336         u16 section_id;
 337         const struct firmware *fw_entry;
 338         const struct {
 339                 __le16 word1;
 340                 __le16 word2;
 341                 u8 data[];
 342         } *file_sec;
 343         const u8 *eof, *temp;
 344         int max_section_size;
 345         const __le32 *dword_buff;
 346
 347 #define NVM_WORD1_LEN(x) (8 * (x & 0x03FF))
 348 #define NVM_WORD2_ID(x) (x >> 12)
 349 #define NVM_WORD2_LEN_FAMILY_8000(x) (2 * ((x & 0xFF) << 8 | x >> 8))
 350 #define NVM_WORD1_ID_FAMILY_8000(x) (x >> 4)
 351 #define NVM_HEADER_0    (0x2A504C54)
 352 #define NVM_HEADER_1    (0x4E564D2A)
 353 #define NVM_HEADER_SIZE (4 * sizeof(u32))
 354
 355         IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from external NVM\n");
 356
 357         /* Maximal size depends on HW family and step */
 358         if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
 359                 max_section_size = IWL_MAX_NVM_SECTION_SIZE;
 360         else if (CSR_HW_REV_STEP(mvm->trans->hw_rev) == SILICON_A_STEP)
 361                 max_section_size = IWL_MAX_NVM_8000A_SECTION_SIZE;
 362         else /* Family 8000 B-step or C-step */
 363                 max_section_size = IWL_MAX_NVM_8000B_SECTION_SIZE;
 364
 365         /*
 366          * Obtain NVM image via request_firmware. Since we already used
 367          * request_firmware_nowait() for the firmware binary load and only
 368          * get here after that we assume the NVM request can be satisfied
 369          * synchronously.
 370          */
 371         ret = request_firmware(&fw_entry, mvm->nvm_file_name,
 372                                mvm->trans->dev);
 373         if (ret) {
 374                 IWL_ERR(mvm, "ERROR: %s isn't available %d\n",
 375                         mvm->nvm_file_name, ret);
 376                 return ret;
 377         }
 378
 379         IWL_INFO(mvm, "Loaded NVM file %s (%zu bytes)\n",
 380                  mvm->nvm_file_name, fw_entry->size);
 381
 382         if (fw_entry->size > MAX_NVM_FILE_LEN) {
 383                 IWL_ERR(mvm, "NVM file too large\n");
 384                 ret = -EINVAL;
 385                 goto out;
 386         }
 387
 388         eof = fw_entry->data + fw_entry->size;
 389         dword_buff = (__le32 *)fw_entry->data;
 390
 391         /* some NVM file will contain a header.
 392          * The header is identified by 2 dwords header as follow:
 393          * dword[0] = 0x2A504C54
 394          * dword[1] = 0x4E564D2A
 395          *
 396          * This header must be skipped when providing the NVM data to the FW.
 397          */
 398         if (fw_entry->size > NVM_HEADER_SIZE &&
 399             dword_buff[0] == cpu_to_le32(NVM_HEADER_0) &&
 400             dword_buff[1] == cpu_to_le32(NVM_HEADER_1)) {
 401                 file_sec = (void *)(fw_entry->data + NVM_HEADER_SIZE);
 402                 IWL_INFO(mvm, "NVM Version %08X\n", le32_to_cpu(dword_buff[2]));
 403                 IWL_INFO(mvm, "NVM Manufacturing date %08X\n",
 404                          le32_to_cpu(dword_buff[3]));
 405         } else {
 406                 file_sec = (void *)fw_entry->data;
 407         }
 408
 409         while (true) {
 410                 if (file_sec->data > eof) {
 411                         IWL_ERR(mvm,
 412                                 "ERROR - NVM file too short for section header\n");
 413                         ret = -EINVAL;
 414                         break;
 415                 }
 416
 417                 /* check for EOF marker */
 418                 if (!file_sec->word1 && !file_sec->word2) {
 419                         ret = 0;
 420                         break;
 421                 }
 422
 423                 if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
 424                         section_size =
 425                                 2 * NVM_WORD1_LEN(le16_to_cpu(file_sec->word1));
 426                         section_id = NVM_WORD2_ID(le16_to_cpu(file_sec->word2));
 427                 } else {
 428                         section_size = 2 * NVM_WORD2_LEN_FAMILY_8000(
 429                                                 le16_to_cpu(file_sec->word2));
 430                         section_id = NVM_WORD1_ID_FAMILY_8000(
 431                                                 le16_to_cpu(file_sec->word1));
 432                 }
 433
 434                 if (section_size > max_section_size) {
 435                         IWL_ERR(mvm, "ERROR - section too large (%d)\n",
 436                                 section_size);
 437                         ret = -EINVAL;
 438                         break;
 439                 }
 440
 441                 if (!section_size) {
 442                         IWL_ERR(mvm, "ERROR - section empty\n");
 443                         ret = -EINVAL;
 444                         break;
 445                 }
 446
 447                 if (file_sec->data + section_size > eof) {
 448                         IWL_ERR(mvm,
 449                                 "ERROR - NVM file too short for section (%d bytes)\n",
 450                                 section_size);
 451                         ret = -EINVAL;
 452                         break;
 453                 }
 454
 455                 if (WARN(section_id >= NVM_MAX_NUM_SECTIONS,
 456                          "Invalid NVM section ID %d\n", section_id)) {
 457                         ret = -EINVAL;
 458                         break;
 459                 }
 460
 461                 temp = kmemdup(file_sec->data, section_size, GFP_KERNEL);
 462                 if (!temp) {
 463                         ret = -ENOMEM;
 464                         break;
 465                 }
 466                 mvm->nvm_sections[section_id].data = temp;
 467                 mvm->nvm_sections[section_id].length = section_size;
 468
 469                 /* advance to the next section */
 470                 file_sec = (void *)(file_sec->data + section_size);
 471         }
 472 out:
 473         release_firmware(fw_entry);
 474         return ret;
 475 }
 476
 477 /* Loads the NVM data stored in mvm->nvm_sections into the NIC */
 478 int iwl_mvm_load_nvm_to_nic(struct iwl_mvm *mvm)
 479 {
 480         int i, ret = 0;
 481         struct iwl_nvm_section *sections = mvm->nvm_sections;
 482
 483         IWL_DEBUG_EEPROM(mvm->trans->dev, "'Write to NVM\n");
 484
 485         for (i = 0; i < ARRAY_SIZE(mvm->nvm_sections); i++) {
 486                 if (!mvm->nvm_sections[i].data || !mvm->nvm_sections[i].length)
 487                         continue;
 488                 ret = iwl_nvm_write_section(mvm, i, sections[i].data,
 489                                             sections[i].length);
 490                 if (ret < 0) {
 491                         IWL_ERR(mvm, "iwl_mvm_send_cmd failed: %d\n", ret);
 492                         break;
 493                 }
 494         }
 495         return ret;
 496 }
 497
 498 int iwl_nvm_init(struct iwl_mvm *mvm, bool read_nvm_from_nic)
 499 {
 500         int ret, section;
 501         u32 size_read = 0;
 502         u8 *nvm_buffer, *temp;
 503
 504         if (WARN_ON_ONCE(mvm->cfg->nvm_hw_section_num >= NVM_MAX_NUM_SECTIONS))
 505                 return -EINVAL;
 506
 507         /* load NVM values from nic */
 508         if (read_nvm_from_nic) {
 509                 /* Read From FW NVM */
 510                 IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from NVM\n");
 511
 512                 nvm_buffer = kmalloc(mvm->cfg->base_params->eeprom_size,
 513                                      GFP_KERNEL);
 514                 if (!nvm_buffer)
 515                         return -ENOMEM;
 516                 for (section = 0; section < NVM_MAX_NUM_SECTIONS; section++) {
 517                         /* we override the constness for initial read */
 518                         ret = iwl_nvm_read_section(mvm, section, nvm_buffer,
 519                                                    size_read);
 520                         if (ret < 0)
 521                                 continue;
 522                         size_read += ret;
 523                         temp = kmemdup(nvm_buffer, ret, GFP_KERNEL);
 524                         if (!temp) {
 525                                 ret = -ENOMEM;
 526                                 break;
 527                         }
 528                         mvm->nvm_sections[section].data = temp;
 529                         mvm->nvm_sections[section].length = ret;
 530
 531 #ifdef CONFIG_IWLWIFI_DEBUGFS
 532                         switch (section) {
 533                         case NVM_SECTION_TYPE_SW:
 534                                 mvm->nvm_sw_blob.data = temp;
 535                                 mvm->nvm_sw_blob.size  = ret;
 536                                 break;
 537                         case NVM_SECTION_TYPE_CALIBRATION:
 538                                 mvm->nvm_calib_blob.data = temp;
 539                                 mvm->nvm_calib_blob.size  = ret;
 540                                 break;
 541                         case NVM_SECTION_TYPE_PRODUCTION:
 542                                 mvm->nvm_prod_blob.data = temp;
 543                                 mvm->nvm_prod_blob.size  = ret;
 544                                 break;
 545                         default:
 546                                 if (section == mvm->cfg->nvm_hw_section_num) {
 547                                         mvm->nvm_hw_blob.data = temp;
 548                                         mvm->nvm_hw_blob.size = ret;
 549                                         break;
 550                                 }
 551                         }
 552 #endif
 553                 }
 554                 if (!size_read)
 555                         IWL_ERR(mvm, "OTP is blank\n");
 556                 kfree(nvm_buffer);
 557         }
 558
 559         /* load external NVM if configured */
 560         if (mvm->nvm_file_name) {
 561                 /* move to External NVM flow */
 562                 ret = iwl_mvm_read_external_nvm(mvm);
 563                 if (ret)
 564                         return ret;
 565         }
 566
 567         /* parse the relevant nvm sections */
 568         mvm->nvm_data = iwl_parse_nvm_sections(mvm);
 569         if (!mvm->nvm_data)
 570                 return -ENODATA;
 571         IWL_DEBUG_EEPROM(mvm->trans->dev, "nvm version = %x\n",
 572                          mvm->nvm_data->nvm_version);
 573
 574         return 0;
 575 }
 576
 577 struct iwl_mcc_update_resp *
 578 iwl_mvm_update_mcc(struct iwl_mvm *mvm, const char *alpha2)
 579 {
 580         struct iwl_mcc_update_cmd mcc_update_cmd = {
 581                 .mcc = cpu_to_le16(alpha2[0] << 8 | alpha2[1]),
 582         };
 583         struct iwl_mcc_update_resp *mcc_resp, *resp_cp = NULL;
 584         struct iwl_rx_packet *pkt;
 585         struct iwl_host_cmd cmd = {
 586                 .id = MCC_UPDATE_CMD,
 587                 .flags = CMD_WANT_SKB,
 588                 .data = { &mcc_update_cmd },
 589         };
 590
 591         int ret;
 592         u32 status;
 593         int resp_len, n_channels;
 594         u16 mcc;
 595
 596         if (WARN_ON_ONCE(!iwl_mvm_is_lar_supported(mvm)))
 597                 return ERR_PTR(-EOPNOTSUPP);
 598
 599         cmd.len[0] = sizeof(struct iwl_mcc_update_cmd);
 600
 601         IWL_DEBUG_LAR(mvm, "send MCC update to FW with '%c%c'\n",
 602                       alpha2[0], alpha2[1]);
 603
 604         ret = iwl_mvm_send_cmd(mvm, &cmd);
 605         if (ret)
 606                 return ERR_PTR(ret);
 607
 608         pkt = cmd.resp_pkt;
 609         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 610                 IWL_ERR(mvm, "Bad return from MCC_UPDATE_COMMAND (0x%08X)\n",
 611                         pkt->hdr.flags);
 612                 ret = -EIO;
 613                 goto exit;
 614         }
 615
 616         /* Extract MCC response */
 617         mcc_resp = (void *)pkt->data;
 618         status = le32_to_cpu(mcc_resp->status);
 619
 620         if (status == MCC_RESP_INVALID) {
 621                 IWL_ERR(mvm,
 622                         "FW ERROR: MCC update with invalid parameter '%c%c'\n",
 623                         alpha2[0], alpha2[1]);
 624                 ret = -EINVAL;
 625                 goto exit;
 626         } else if (status == MCC_RESP_NVM_DISABLED) {
 627                 ret = 0;
 628                 /* resp_cp will be NULL */
 629                 goto exit;
 630         }
 631
 632         mcc = le16_to_cpu(mcc_resp->mcc);
 633
 634         /* W/A for a FW/NVM issue - returns 0x00 for the world domain */
 635         if (mcc == 0) {
 636                 mcc = 0x3030;  /* "00" - world */
 637                 mcc_resp->mcc = cpu_to_le16(mcc);
 638         }
 639
 640         n_channels =  __le32_to_cpu(mcc_resp->n_channels);
 641         IWL_DEBUG_LAR(mvm,
 642                       "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') change: %d n_chans: %d\n",
 643                       status, mcc, mcc >> 8, mcc & 0xff,
 644                       !!(status == MCC_RESP_SAME_CHAN_PROFILE), n_channels);
 645
 646         resp_len = sizeof(*mcc_resp) + n_channels * sizeof(__le32);
 647         resp_cp = kmemdup(mcc_resp, resp_len, GFP_KERNEL);
 648         if (!resp_cp) {
 649                 ret = -ENOMEM;
 650                 goto exit;
 651         }
 652
 653         ret = 0;
 654 exit:
 655         iwl_free_resp(&cmd);
 656         if (ret)
 657                 return ERR_PTR(ret);
 658         return resp_cp;
 659 }
 660
 661 int iwl_mvm_init_mcc(struct iwl_mvm *mvm)
 662 {
 663         bool tlv_lar;
 664         bool nvm_lar;
 665
 666         if (mvm->cfg->device_family == IWL_DEVICE_FAMILY_8000) {
 667                 tlv_lar = mvm->fw->ucode_capa.capa[0] &
 668                         IWL_UCODE_TLV_CAPA_LAR_SUPPORT;
 669                 nvm_lar = mvm->nvm_data->lar_enabled;
 670                 if (tlv_lar != nvm_lar)
 671                         IWL_INFO(mvm,
 672                                  "Conflict between TLV & NVM regarding enabling LAR (TLV = %s NVM =%s)\n",
 673                                  tlv_lar ? "enabled" : "disabled",
 674                                  nvm_lar ? "enabled" : "disabled");
 675         }
 676
 677         if (!iwl_mvm_is_lar_supported(mvm))
 678                 return 0;
 679
 680         /*
 681          * During HW restart, only replay the last set MCC to FW. Otherwise,
 682          * queue an update to cfg80211 to retrieve the default alpha2 from FW.
 683          */
 684         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
 685                 /* This should only be called during vif up and hold RTNL */
 686                 const struct ieee80211_regdomain *r =
 687                                 rtnl_dereference(mvm->hw->wiphy->regd);
 688
 689                 if (r) {
 690                         struct iwl_mcc_update_resp *resp;
 691
 692                         resp = iwl_mvm_update_mcc(mvm, r->alpha2);
 693                         if (IS_ERR_OR_NULL(resp))
 694                                 return -EIO;
 695
 696                         kfree(resp);
 697                 }
 698
 699                 return 0;
 700         }
 701
 702         /*
 703          * Driver regulatory hint for initial update - use the special
 704          * unknown-country "99" code. This will also clear the "custom reg"
 705          * flag and allow regdomain changes. It will happen after init since
 706          * RTNL is required.
 707          * Disallow scans that might crash the FW while the LAR regdomain
 708          * is not set.
 709          */
 710         mvm->lar_regdom_set = false;
 711         return 0;
 712 }
 713
 714 int iwl_mvm_rx_chub_update_mcc(struct iwl_mvm *mvm,
 715                                struct iwl_rx_cmd_buffer *rxb,
 716                                struct iwl_device_cmd *cmd)
 717 {
 718         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 719         struct iwl_mcc_chub_notif *notif = (void *)pkt->data;
 720         char mcc[3];
 721
 722         if (WARN_ON_ONCE(!iwl_mvm_is_lar_supported(mvm)))
 723                 return -EOPNOTSUPP;
 724
 725         mcc[0] = notif->mcc >> 8;
 726         mcc[1] = notif->mcc & 0xff;
 727         mcc[2] = '\0';
 728
 729         IWL_DEBUG_LAR(mvm,
 730                       "RX: received chub update mcc command (mcc 0x%x '%s')\n",
 731                       notif->mcc, mcc);
 732         return 0;
 733 }