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
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  29  *  Intel Linux Wireless <ilw@linux.intel.com>
  30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  31  *
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  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  36  * All rights reserved.
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  39  * modification, are permitted provided that the following conditions
  40  * are met:
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  43  *    notice, this list of conditions and the following disclaimer.
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  46  *    the documentation and/or other materials provided with the
  47  *    distribution.
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  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, *phy_sku;
 267         bool is_family_8000_a_step = false, lar_enabled;
 268
 269         /* Checking for required sections */
 270         if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
 271                 if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
 272                     !mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data) {
 273                         IWL_ERR(mvm, "Can't parse empty OTP/NVM sections\n");
 274                         return NULL;
 275                 }
 276         } else {
 277                 /* SW and REGULATORY sections are mandatory */
 278                 if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
 279                     !mvm->nvm_sections[NVM_SECTION_TYPE_REGULATORY].data) {
 280                         IWL_ERR(mvm,
 281                                 "Can't parse empty family 8000 OTP/NVM sections\n");
 282                         return NULL;
 283                 }
 284                 /* MAC_OVERRIDE or at least HW section must exist */
 285                 if (!mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data &&
 286                     !mvm->nvm_sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data) {
 287                         IWL_ERR(mvm,
 288                                 "Can't parse mac_address, empty sections\n");
 289                         return NULL;
 290                 }
 291
 292                 if (CSR_HW_REV_STEP(mvm->trans->hw_rev) == SILICON_A_STEP)
 293                         is_family_8000_a_step = true;
 294
 295                 /* PHY_SKU section is mandatory in B0 */
 296                 if (!is_family_8000_a_step &&
 297                     !mvm->nvm_sections[NVM_SECTION_TYPE_PHY_SKU].data) {
 298                         IWL_ERR(mvm,
 299                                 "Can't parse phy_sku in B0, empty sections\n");
 300                         return NULL;
 301                 }
 302         }
 303
 304         if (WARN_ON(!mvm->cfg))
 305                 return NULL;
 306
 307         hw = (const __le16 *)sections[mvm->cfg->nvm_hw_section_num].data;
 308         sw = (const __le16 *)sections[NVM_SECTION_TYPE_SW].data;
 309         calib = (const __le16 *)sections[NVM_SECTION_TYPE_CALIBRATION].data;
 310         regulatory = (const __le16 *)sections[NVM_SECTION_TYPE_REGULATORY].data;
 311         mac_override =
 312                 (const __le16 *)sections[NVM_SECTION_TYPE_MAC_OVERRIDE].data;
 313         phy_sku = (const __le16 *)sections[NVM_SECTION_TYPE_PHY_SKU].data;
 314
 315         lar_enabled = !iwlwifi_mod_params.lar_disable &&
 316                       (mvm->fw->ucode_capa.capa[0] &
 317                        IWL_UCODE_TLV_CAPA_LAR_SUPPORT);
 318
 319         return iwl_parse_nvm_data(mvm->trans->dev, mvm->cfg, hw, sw, calib,
 320                                   regulatory, mac_override, phy_sku,
 321                                   mvm->fw->valid_tx_ant, mvm->fw->valid_rx_ant,
 322                                   lar_enabled, is_family_8000_a_step);
 323 }
 324
 325 #define MAX_NVM_FILE_LEN        16384
 326
 327 /*
 328  * Reads external NVM from a file into mvm->nvm_sections
 329  *
 330  * HOW TO CREATE THE NVM FILE FORMAT:
 331  * ------------------------------
 332  * 1. create hex file, format:
 333  *      3800 -> header
 334  *      0000 -> header
 335  *      5a40 -> data
 336  *
 337  *   rev - 6 bit (word1)
 338  *   len - 10 bit (word1)
 339  *   id - 4 bit (word2)
 340  *   rsv - 12 bit (word2)
 341  *
 342  * 2. flip 8bits with 8 bits per line to get the right NVM file format
 343  *
 344  * 3. create binary file from the hex file
 345  *
 346  * 4. save as "iNVM_xxx.bin" under /lib/firmware
 347  */
 348 static int iwl_mvm_read_external_nvm(struct iwl_mvm *mvm)
 349 {
 350         int ret, section_size;
 351         u16 section_id;
 352         const struct firmware *fw_entry;
 353         const struct {
 354                 __le16 word1;
 355                 __le16 word2;
 356                 u8 data[];
 357         } *file_sec;
 358         const u8 *eof, *temp;
 359         int max_section_size;
 360         const __le32 *dword_buff;
 361
 362 #define NVM_WORD1_LEN(x) (8 * (x & 0x03FF))
 363 #define NVM_WORD2_ID(x) (x >> 12)
 364 #define NVM_WORD2_LEN_FAMILY_8000(x) (2 * ((x & 0xFF) << 8 | x >> 8))
 365 #define NVM_WORD1_ID_FAMILY_8000(x) (x >> 4)
 366 #define NVM_HEADER_0    (0x2A504C54)
 367 #define NVM_HEADER_1    (0x4E564D2A)
 368 #define NVM_HEADER_SIZE (4 * sizeof(u32))
 369
 370         IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from external NVM\n");
 371
 372         /* Maximal size depends on HW family and step */
 373         if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
 374                 max_section_size = IWL_MAX_NVM_SECTION_SIZE;
 375         else if (CSR_HW_REV_STEP(mvm->trans->hw_rev) == SILICON_A_STEP)
 376                 max_section_size = IWL_MAX_NVM_8000A_SECTION_SIZE;
 377         else /* Family 8000 B-step or C-step */
 378                 max_section_size = IWL_MAX_NVM_8000B_SECTION_SIZE;
 379
 380         /*
 381          * Obtain NVM image via request_firmware. Since we already used
 382          * request_firmware_nowait() for the firmware binary load and only
 383          * get here after that we assume the NVM request can be satisfied
 384          * synchronously.
 385          */
 386         ret = request_firmware(&fw_entry, mvm->nvm_file_name,
 387                                mvm->trans->dev);
 388         if (ret) {
 389                 IWL_ERR(mvm, "ERROR: %s isn't available %d\n",
 390                         mvm->nvm_file_name, ret);
 391                 return ret;
 392         }
 393
 394         IWL_INFO(mvm, "Loaded NVM file %s (%zu bytes)\n",
 395                  mvm->nvm_file_name, fw_entry->size);
 396
 397         if (fw_entry->size > MAX_NVM_FILE_LEN) {
 398                 IWL_ERR(mvm, "NVM file too large\n");
 399                 ret = -EINVAL;
 400                 goto out;
 401         }
 402
 403         eof = fw_entry->data + fw_entry->size;
 404         dword_buff = (__le32 *)fw_entry->data;
 405
 406         /* some NVM file will contain a header.
 407          * The header is identified by 2 dwords header as follow:
 408          * dword[0] = 0x2A504C54
 409          * dword[1] = 0x4E564D2A
 410          *
 411          * This header must be skipped when providing the NVM data to the FW.
 412          */
 413         if (fw_entry->size > NVM_HEADER_SIZE &&
 414             dword_buff[0] == cpu_to_le32(NVM_HEADER_0) &&
 415             dword_buff[1] == cpu_to_le32(NVM_HEADER_1)) {
 416                 file_sec = (void *)(fw_entry->data + NVM_HEADER_SIZE);
 417                 IWL_INFO(mvm, "NVM Version %08X\n", le32_to_cpu(dword_buff[2]));
 418                 IWL_INFO(mvm, "NVM Manufacturing date %08X\n",
 419                          le32_to_cpu(dword_buff[3]));
 420         } else {
 421                 file_sec = (void *)fw_entry->data;
 422         }
 423
 424         while (true) {
 425                 if (file_sec->data > eof) {
 426                         IWL_ERR(mvm,
 427                                 "ERROR - NVM file too short for section header\n");
 428                         ret = -EINVAL;
 429                         break;
 430                 }
 431
 432                 /* check for EOF marker */
 433                 if (!file_sec->word1 && !file_sec->word2) {
 434                         ret = 0;
 435                         break;
 436                 }
 437
 438                 if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
 439                         section_size =
 440                                 2 * NVM_WORD1_LEN(le16_to_cpu(file_sec->word1));
 441                         section_id = NVM_WORD2_ID(le16_to_cpu(file_sec->word2));
 442                 } else {
 443                         section_size = 2 * NVM_WORD2_LEN_FAMILY_8000(
 444                                                 le16_to_cpu(file_sec->word2));
 445                         section_id = NVM_WORD1_ID_FAMILY_8000(
 446                                                 le16_to_cpu(file_sec->word1));
 447                 }
 448
 449                 if (section_size > max_section_size) {
 450                         IWL_ERR(mvm, "ERROR - section too large (%d)\n",
 451                                 section_size);
 452                         ret = -EINVAL;
 453                         break;
 454                 }
 455
 456                 if (!section_size) {
 457                         IWL_ERR(mvm, "ERROR - section empty\n");
 458                         ret = -EINVAL;
 459                         break;
 460                 }
 461
 462                 if (file_sec->data + section_size > eof) {
 463                         IWL_ERR(mvm,
 464                                 "ERROR - NVM file too short for section (%d bytes)\n",
 465                                 section_size);
 466                         ret = -EINVAL;
 467                         break;
 468                 }
 469
 470                 if (WARN(section_id >= NVM_MAX_NUM_SECTIONS,
 471                          "Invalid NVM section ID %d\n", section_id)) {
 472                         ret = -EINVAL;
 473                         break;
 474                 }
 475
 476                 temp = kmemdup(file_sec->data, section_size, GFP_KERNEL);
 477                 if (!temp) {
 478                         ret = -ENOMEM;
 479                         break;
 480                 }
 481                 mvm->nvm_sections[section_id].data = temp;
 482                 mvm->nvm_sections[section_id].length = section_size;
 483
 484                 /* advance to the next section */
 485                 file_sec = (void *)(file_sec->data + section_size);
 486         }
 487 out:
 488         release_firmware(fw_entry);
 489         return ret;
 490 }
 491
 492 /* Loads the NVM data stored in mvm->nvm_sections into the NIC */
 493 int iwl_mvm_load_nvm_to_nic(struct iwl_mvm *mvm)
 494 {
 495         int i, ret = 0;
 496         struct iwl_nvm_section *sections = mvm->nvm_sections;
 497
 498         IWL_DEBUG_EEPROM(mvm->trans->dev, "'Write to NVM\n");
 499
 500         for (i = 0; i < ARRAY_SIZE(mvm->nvm_sections); i++) {
 501                 if (!mvm->nvm_sections[i].data || !mvm->nvm_sections[i].length)
 502                         continue;
 503                 ret = iwl_nvm_write_section(mvm, i, sections[i].data,
 504                                             sections[i].length);
 505                 if (ret < 0) {
 506                         IWL_ERR(mvm, "iwl_mvm_send_cmd failed: %d\n", ret);
 507                         break;
 508                 }
 509         }
 510         return ret;
 511 }
 512
 513 int iwl_nvm_init(struct iwl_mvm *mvm, bool read_nvm_from_nic)
 514 {
 515         int ret, section;
 516         u32 size_read = 0;
 517         u8 *nvm_buffer, *temp;
 518
 519         if (WARN_ON_ONCE(mvm->cfg->nvm_hw_section_num >= NVM_MAX_NUM_SECTIONS))
 520                 return -EINVAL;
 521
 522         /* load NVM values from nic */
 523         if (read_nvm_from_nic) {
 524                 /* Read From FW NVM */
 525                 IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from NVM\n");
 526
 527                 nvm_buffer = kmalloc(mvm->cfg->base_params->eeprom_size,
 528                                      GFP_KERNEL);
 529                 if (!nvm_buffer)
 530                         return -ENOMEM;
 531                 for (section = 0; section < NVM_MAX_NUM_SECTIONS; section++) {
 532                         /* we override the constness for initial read */
 533                         ret = iwl_nvm_read_section(mvm, section, nvm_buffer,
 534                                                    size_read);
 535                         if (ret < 0)
 536                                 continue;
 537                         size_read += ret;
 538                         temp = kmemdup(nvm_buffer, ret, GFP_KERNEL);
 539                         if (!temp) {
 540                                 ret = -ENOMEM;
 541                                 break;
 542                         }
 543                         mvm->nvm_sections[section].data = temp;
 544                         mvm->nvm_sections[section].length = ret;
 545
 546 #ifdef CONFIG_IWLWIFI_DEBUGFS
 547                         switch (section) {
 548                         case NVM_SECTION_TYPE_SW:
 549                                 mvm->nvm_sw_blob.data = temp;
 550                                 mvm->nvm_sw_blob.size  = ret;
 551                                 break;
 552                         case NVM_SECTION_TYPE_CALIBRATION:
 553                                 mvm->nvm_calib_blob.data = temp;
 554                                 mvm->nvm_calib_blob.size  = ret;
 555                                 break;
 556                         case NVM_SECTION_TYPE_PRODUCTION:
 557                                 mvm->nvm_prod_blob.data = temp;
 558                                 mvm->nvm_prod_blob.size  = ret;
 559                                 break;
 560                         default:
 561                                 if (section == mvm->cfg->nvm_hw_section_num) {
 562                                         mvm->nvm_hw_blob.data = temp;
 563                                         mvm->nvm_hw_blob.size = ret;
 564                                         break;
 565                                 }
 566                         }
 567 #endif
 568                 }
 569                 if (!size_read)
 570                         IWL_ERR(mvm, "OTP is blank\n");
 571                 kfree(nvm_buffer);
 572         }
 573
 574         /* load external NVM if configured */
 575         if (mvm->nvm_file_name) {
 576                 /* move to External NVM flow */
 577                 ret = iwl_mvm_read_external_nvm(mvm);
 578                 if (ret)
 579                         return ret;
 580         }
 581
 582         /* parse the relevant nvm sections */
 583         mvm->nvm_data = iwl_parse_nvm_sections(mvm);
 584         if (!mvm->nvm_data)
 585                 return -ENODATA;
 586         IWL_DEBUG_EEPROM(mvm->trans->dev, "nvm version = %x\n",
 587                          mvm->nvm_data->nvm_version);
 588
 589         return 0;
 590 }
 591
 592 struct iwl_mcc_update_resp *
 593 iwl_mvm_update_mcc(struct iwl_mvm *mvm, const char *alpha2)
 594 {
 595         struct iwl_mcc_update_cmd mcc_update_cmd = {
 596                 .mcc = cpu_to_le16(alpha2[0] << 8 | alpha2[1]),
 597         };
 598         struct iwl_mcc_update_resp *mcc_resp, *resp_cp = NULL;
 599         struct iwl_rx_packet *pkt;
 600         struct iwl_host_cmd cmd = {
 601                 .id = MCC_UPDATE_CMD,
 602                 .flags = CMD_WANT_SKB,
 603                 .data = { &mcc_update_cmd },
 604         };
 605
 606         int ret;
 607         u32 status;
 608         int resp_len, n_channels;
 609         u16 mcc;
 610
 611         if (WARN_ON_ONCE(!iwl_mvm_is_lar_supported(mvm)))
 612                 return ERR_PTR(-EOPNOTSUPP);
 613
 614         cmd.len[0] = sizeof(struct iwl_mcc_update_cmd);
 615
 616         IWL_DEBUG_LAR(mvm, "send MCC update to FW with '%c%c'\n",
 617                       alpha2[0], alpha2[1]);
 618
 619         ret = iwl_mvm_send_cmd(mvm, &cmd);
 620         if (ret)
 621                 return ERR_PTR(ret);
 622
 623         pkt = cmd.resp_pkt;
 624         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 625                 IWL_ERR(mvm, "Bad return from MCC_UPDATE_COMMAND (0x%08X)\n",
 626                         pkt->hdr.flags);
 627                 ret = -EIO;
 628                 goto exit;
 629         }
 630
 631         /* Extract MCC response */
 632         mcc_resp = (void *)pkt->data;
 633         status = le32_to_cpu(mcc_resp->status);
 634
 635         if (status == MCC_RESP_INVALID) {
 636                 IWL_ERR(mvm,
 637                         "FW ERROR: MCC update with invalid parameter '%c%c'\n",
 638                         alpha2[0], alpha2[1]);
 639                 ret = -EINVAL;
 640                 goto exit;
 641         } else if (status == MCC_RESP_NVM_DISABLED) {
 642                 ret = 0;
 643                 /* resp_cp will be NULL */
 644                 goto exit;
 645         }
 646
 647         mcc = le16_to_cpu(mcc_resp->mcc);
 648
 649         /* W/A for a FW/NVM issue - returns 0x00 for the world domain */
 650         if (mcc == 0) {
 651                 mcc = 0x3030;  /* "00" - world */
 652                 mcc_resp->mcc = cpu_to_le16(mcc);
 653         }
 654
 655         n_channels =  __le32_to_cpu(mcc_resp->n_channels);
 656         IWL_DEBUG_LAR(mvm,
 657                       "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') change: %d n_chans: %d\n",
 658                       status, mcc, mcc >> 8, mcc & 0xff,
 659                       !!(status == MCC_RESP_SAME_CHAN_PROFILE), n_channels);
 660
 661         resp_len = sizeof(*mcc_resp) + n_channels * sizeof(__le32);
 662         resp_cp = kmemdup(mcc_resp, resp_len, GFP_KERNEL);
 663         if (!resp_cp) {
 664                 ret = -ENOMEM;
 665                 goto exit;
 666         }
 667
 668         ret = 0;
 669 exit:
 670         iwl_free_resp(&cmd);
 671         if (ret)
 672                 return ERR_PTR(ret);
 673         return resp_cp;
 674 }
 675
 676 int iwl_mvm_init_mcc(struct iwl_mvm *mvm)
 677 {
 678         bool tlv_lar;
 679         bool nvm_lar;
 680
 681         if (mvm->cfg->device_family == IWL_DEVICE_FAMILY_8000) {
 682                 tlv_lar = mvm->fw->ucode_capa.capa[0] &
 683                         IWL_UCODE_TLV_CAPA_LAR_SUPPORT;
 684                 nvm_lar = mvm->nvm_data->lar_enabled;
 685                 if (tlv_lar != nvm_lar)
 686                         IWL_INFO(mvm,
 687                                  "Conflict between TLV & NVM regarding enabling LAR (TLV = %s NVM =%s)\n",
 688                                  tlv_lar ? "enabled" : "disabled",
 689                                  nvm_lar ? "enabled" : "disabled");
 690         }
 691
 692         if (!iwl_mvm_is_lar_supported(mvm))
 693                 return 0;
 694
 695         /*
 696          * During HW restart, only replay the last set MCC to FW. Otherwise,
 697          * queue an update to cfg80211 to retrieve the default alpha2 from FW.
 698          */
 699         if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
 700                 /* This should only be called during vif up and hold RTNL */
 701                 const struct ieee80211_regdomain *r =
 702                                 rtnl_dereference(mvm->hw->wiphy->regd);
 703
 704                 if (r) {
 705                         struct iwl_mcc_update_resp *resp;
 706
 707                         resp = iwl_mvm_update_mcc(mvm, r->alpha2);
 708                         if (IS_ERR_OR_NULL(resp))
 709                                 return -EIO;
 710
 711                         kfree(resp);
 712                 }
 713
 714                 return 0;
 715         }
 716
 717         /*
 718          * Driver regulatory hint for initial update - use the special
 719          * unknown-country "99" code. This will also clear the "custom reg"
 720          * flag and allow regdomain changes. It will happen after init since
 721          * RTNL is required.
 722          * Disallow scans that might crash the FW while the LAR regdomain
 723          * is not set.
 724          */
 725         mvm->lar_regdom_set = false;
 726         return 0;
 727 }
 728
 729 int iwl_mvm_rx_chub_update_mcc(struct iwl_mvm *mvm,
 730                                struct iwl_rx_cmd_buffer *rxb,
 731                                struct iwl_device_cmd *cmd)
 732 {
 733         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 734         struct iwl_mcc_chub_notif *notif = (void *)pkt->data;
 735         char mcc[3];
 736
 737         if (WARN_ON_ONCE(!iwl_mvm_is_lar_supported(mvm)))
 738                 return -EOPNOTSUPP;
 739
 740         mcc[0] = notif->mcc >> 8;
 741         mcc[1] = notif->mcc & 0xff;
 742         mcc[2] = '\0';
 743
 744         IWL_DEBUG_LAR(mvm,
 745                       "RX: received chub update mcc command (mcc 0x%x '%s')\n",
 746                       notif->mcc, mcc);
 747         return 0;
 748 }