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 - 2013 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
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  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
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  20  * along with this program; if not, write to the Free Software
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  25  * in the file called COPYING.
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  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) 2012 - 2013 Intel Corporation. All rights reserved.
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  37  * modification, are permitted provided that the following conditions
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  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.
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  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 #include <linux/firmware.h>
  64 #include "iwl-trans.h"
  65 #include "mvm.h"
  66 #include "iwl-eeprom-parse.h"
  67 #include "iwl-eeprom-read.h"
  68 #include "iwl-nvm-parse.h"
  69
  70 /* list of NVM sections we are allowed/need to read */
  71 static const int nvm_to_read[] = {
  72         NVM_SECTION_TYPE_HW,
  73         NVM_SECTION_TYPE_SW,
  74         NVM_SECTION_TYPE_CALIBRATION,
  75         NVM_SECTION_TYPE_PRODUCTION,
  76 };
  77
  78 /* Default NVM size to read */
  79 #define IWL_NVM_DEFAULT_CHUNK_SIZE (2*1024)
  80 #define IWL_MAX_NVM_SECTION_SIZE 6000
  81
  82 #define NVM_WRITE_OPCODE 1
  83 #define NVM_READ_OPCODE 0
  84
  85 /*
  86  * prepare the NVM host command w/ the pointers to the nvm buffer
  87  * and send it to fw
  88  */
  89 static int iwl_nvm_write_chunk(struct iwl_mvm *mvm, u16 section,
  90                                u16 offset, u16 length, const u8 *data)
  91 {
  92         struct iwl_nvm_access_cmd nvm_access_cmd = {
  93                 .offset = cpu_to_le16(offset),
  94                 .length = cpu_to_le16(length),
  95                 .type = cpu_to_le16(section),
  96                 .op_code = NVM_WRITE_OPCODE,
  97         };
  98         struct iwl_host_cmd cmd = {
  99                 .id = NVM_ACCESS_CMD,
 100                 .len = { sizeof(struct iwl_nvm_access_cmd), length },
 101                 .flags = CMD_SYNC | CMD_SEND_IN_RFKILL,
 102                 .data = { &nvm_access_cmd, data },
 103                 /* data may come from vmalloc, so use _DUP */
 104                 .dataflags = { 0, IWL_HCMD_DFL_DUP },
 105         };
 106
 107         return iwl_mvm_send_cmd(mvm, &cmd);
 108 }
 109
 110 static int iwl_nvm_read_chunk(struct iwl_mvm *mvm, u16 section,
 111                               u16 offset, u16 length, u8 *data)
 112 {
 113         struct iwl_nvm_access_cmd nvm_access_cmd = {
 114                 .offset = cpu_to_le16(offset),
 115                 .length = cpu_to_le16(length),
 116                 .type = cpu_to_le16(section),
 117                 .op_code = NVM_READ_OPCODE,
 118         };
 119         struct iwl_nvm_access_resp *nvm_resp;
 120         struct iwl_rx_packet *pkt;
 121         struct iwl_host_cmd cmd = {
 122                 .id = NVM_ACCESS_CMD,
 123                 .flags = CMD_SYNC | CMD_WANT_SKB | CMD_SEND_IN_RFKILL,
 124                 .data = { &nvm_access_cmd, },
 125         };
 126         int ret, bytes_read, offset_read;
 127         u8 *resp_data;
 128
 129         cmd.len[0] = sizeof(struct iwl_nvm_access_cmd);
 130
 131         ret = iwl_mvm_send_cmd(mvm, &cmd);
 132         if (ret)
 133                 return ret;
 134
 135         pkt = cmd.resp_pkt;
 136         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 137                 IWL_ERR(mvm, "Bad return from NVM_ACCES_COMMAND (0x%08X)\n",
 138                         pkt->hdr.flags);
 139                 ret = -EIO;
 140                 goto exit;
 141         }
 142
 143         /* Extract NVM response */
 144         nvm_resp = (void *)pkt->data;
 145         ret = le16_to_cpu(nvm_resp->status);
 146         bytes_read = le16_to_cpu(nvm_resp->length);
 147         offset_read = le16_to_cpu(nvm_resp->offset);
 148         resp_data = nvm_resp->data;
 149         if (ret) {
 150                 IWL_ERR(mvm,
 151                         "NVM access command failed with status %d (device: %s)\n",
 152                         ret, mvm->cfg->name);
 153                 ret = -EINVAL;
 154                 goto exit;
 155         }
 156
 157         if (offset_read != offset) {
 158                 IWL_ERR(mvm, "NVM ACCESS response with invalid offset %d\n",
 159                         offset_read);
 160                 ret = -EINVAL;
 161                 goto exit;
 162         }
 163
 164         /* Write data to NVM */
 165         memcpy(data + offset, resp_data, bytes_read);
 166         ret = bytes_read;
 167
 168 exit:
 169         iwl_free_resp(&cmd);
 170         return ret;
 171 }
 172
 173 static int iwl_nvm_write_section(struct iwl_mvm *mvm, u16 section,
 174                                  const u8 *data, u16 length)
 175 {
 176         int offset = 0;
 177
 178         /* copy data in chunks of 2k (and remainder if any) */
 179
 180         while (offset < length) {
 181                 int chunk_size, ret;
 182
 183                 chunk_size = min(IWL_NVM_DEFAULT_CHUNK_SIZE,
 184                                  length - offset);
 185
 186                 ret = iwl_nvm_write_chunk(mvm, section, offset,
 187                                           chunk_size, data + offset);
 188                 if (ret < 0)
 189                         return ret;
 190
 191                 offset += chunk_size;
 192         }
 193
 194         return 0;
 195 }
 196
 197 /*
 198  * Reads an NVM section completely.
 199  * NICs prior to 7000 family doesn't have a real NVM, but just read
 200  * section 0 which is the EEPROM. Because the EEPROM reading is unlimited
 201  * by uCode, we need to manually check in this case that we don't
 202  * overflow and try to read more than the EEPROM size.
 203  * For 7000 family NICs, we supply the maximal size we can read, and
 204  * the uCode fills the response with as much data as we can,
 205  * without overflowing, so no check is needed.
 206  */
 207 static int iwl_nvm_read_section(struct iwl_mvm *mvm, u16 section,
 208                                 u8 *data)
 209 {
 210         u16 length, offset = 0;
 211         int ret;
 212
 213         /* Set nvm section read length */
 214         length = IWL_NVM_DEFAULT_CHUNK_SIZE;
 215
 216         ret = length;
 217
 218         /* Read the NVM until exhausted (reading less than requested) */
 219         while (ret == length) {
 220                 ret = iwl_nvm_read_chunk(mvm, section, offset, length, data);
 221                 if (ret < 0) {
 222                         IWL_ERR(mvm,
 223                                 "Cannot read NVM from section %d offset %d, length %d\n",
 224                                 section, offset, length);
 225                         return ret;
 226                 }
 227                 offset += ret;
 228         }
 229
 230         IWL_DEBUG_EEPROM(mvm->trans->dev,
 231                          "NVM section %d read completed\n", section);
 232         return offset;
 233 }
 234
 235 static struct iwl_nvm_data *
 236 iwl_parse_nvm_sections(struct iwl_mvm *mvm)
 237 {
 238         struct iwl_nvm_section *sections = mvm->nvm_sections;
 239         const __le16 *hw, *sw, *calib;
 240
 241         /* Checking for required sections */
 242         if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
 243             !mvm->nvm_sections[NVM_SECTION_TYPE_HW].data) {
 244                 IWL_ERR(mvm, "Can't parse empty NVM sections\n");
 245                 return NULL;
 246         }
 247
 248         if (WARN_ON(!mvm->cfg))
 249                 return NULL;
 250
 251         hw = (const __le16 *)sections[NVM_SECTION_TYPE_HW].data;
 252         sw = (const __le16 *)sections[NVM_SECTION_TYPE_SW].data;
 253         calib = (const __le16 *)sections[NVM_SECTION_TYPE_CALIBRATION].data;
 254         return iwl_parse_nvm_data(mvm->trans->dev, mvm->cfg, hw, sw, calib,
 255                                   iwl_fw_valid_tx_ant(mvm->fw),
 256                                   iwl_fw_valid_rx_ant(mvm->fw));
 257 }
 258
 259 #define MAX_NVM_FILE_LEN        16384
 260
 261 /*
 262  * HOW TO CREATE THE NVM FILE FORMAT:
 263  * ------------------------------
 264  * 1. create hex file, format:
 265  *      3800 -> header
 266  *      0000 -> header
 267  *      5a40 -> data
 268  *
 269  *   rev - 6 bit (word1)
 270  *   len - 10 bit (word1)
 271  *   id - 4 bit (word2)
 272  *   rsv - 12 bit (word2)
 273  *
 274  * 2. flip 8bits with 8 bits per line to get the right NVM file format
 275  *
 276  * 3. create binary file from the hex file
 277  *
 278  * 4. save as "iNVM_xxx.bin" under /lib/firmware
 279  */
 280 static int iwl_mvm_load_external_nvm(struct iwl_mvm *mvm)
 281 {
 282         int ret, section_id, section_size;
 283         const struct firmware *fw_entry;
 284         const struct {
 285                 __le16 word1;
 286                 __le16 word2;
 287                 u8 data[];
 288         } *file_sec;
 289         const u8 *eof;
 290
 291 #define NVM_WORD1_LEN(x) (8 * (x & 0x03FF))
 292 #define NVM_WORD2_ID(x) (x >> 12)
 293
 294         /*
 295          * Obtain NVM image via request_firmware. Since we already used
 296          * request_firmware_nowait() for the firmware binary load and only
 297          * get here after that we assume the NVM request can be satisfied
 298          * synchronously.
 299          */
 300         ret = request_firmware(&fw_entry, iwlwifi_mod_params.nvm_file,
 301                                mvm->trans->dev);
 302         if (ret) {
 303                 IWL_ERR(mvm, "ERROR: %s isn't available %d\n",
 304                         iwlwifi_mod_params.nvm_file, ret);
 305                 return ret;
 306         }
 307
 308         IWL_INFO(mvm, "Loaded NVM file %s (%zu bytes)\n",
 309                  iwlwifi_mod_params.nvm_file, fw_entry->size);
 310
 311         if (fw_entry->size < sizeof(*file_sec)) {
 312                 IWL_ERR(mvm, "NVM file too small\n");
 313                 ret = -EINVAL;
 314                 goto out;
 315         }
 316
 317         if (fw_entry->size > MAX_NVM_FILE_LEN) {
 318                 IWL_ERR(mvm, "NVM file too large\n");
 319                 ret = -EINVAL;
 320                 goto out;
 321         }
 322
 323         eof = fw_entry->data + fw_entry->size;
 324
 325         file_sec = (void *)fw_entry->data;
 326
 327         while (true) {
 328                 if (file_sec->data > eof) {
 329                         IWL_ERR(mvm,
 330                                 "ERROR - NVM file too short for section header\n");
 331                         ret = -EINVAL;
 332                         break;
 333                 }
 334
 335                 /* check for EOF marker */
 336                 if (!file_sec->word1 && !file_sec->word2) {
 337                         ret = 0;
 338                         break;
 339                 }
 340
 341                 section_size = 2 * NVM_WORD1_LEN(le16_to_cpu(file_sec->word1));
 342                 section_id = NVM_WORD2_ID(le16_to_cpu(file_sec->word2));
 343
 344                 if (section_size > IWL_MAX_NVM_SECTION_SIZE) {
 345                         IWL_ERR(mvm, "ERROR - section too large (%d)\n",
 346                                 section_size);
 347                         ret = -EINVAL;
 348                         break;
 349                 }
 350
 351                 if (!section_size) {
 352                         IWL_ERR(mvm, "ERROR - section empty\n");
 353                         ret = -EINVAL;
 354                         break;
 355                 }
 356
 357                 if (file_sec->data + section_size > eof) {
 358                         IWL_ERR(mvm,
 359                                 "ERROR - NVM file too short for section (%d bytes)\n",
 360                                 section_size);
 361                         ret = -EINVAL;
 362                         break;
 363                 }
 364
 365                 ret = iwl_nvm_write_section(mvm, section_id, file_sec->data,
 366                                             section_size);
 367                 if (ret < 0) {
 368                         IWL_ERR(mvm, "iwl_mvm_send_cmd failed: %d\n", ret);
 369                         break;
 370                 }
 371
 372                 /* advance to the next section */
 373                 file_sec = (void *)(file_sec->data + section_size);
 374         }
 375 out:
 376         release_firmware(fw_entry);
 377         return ret;
 378 }
 379
 380 int iwl_nvm_init(struct iwl_mvm *mvm)
 381 {
 382         int ret, i, section;
 383         u8 *nvm_buffer, *temp;
 384
 385         /* load external NVM if configured */
 386         if (iwlwifi_mod_params.nvm_file) {
 387                 /* move to External NVM flow */
 388                 ret = iwl_mvm_load_external_nvm(mvm);
 389                 if (ret)
 390                         return ret;
 391         }
 392
 393         /* Read From FW NVM */
 394         IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from NVM\n");
 395
 396         /* TODO: find correct NVM max size for a section */
 397         nvm_buffer = kmalloc(mvm->cfg->base_params->eeprom_size,
 398                              GFP_KERNEL);
 399         if (!nvm_buffer)
 400                 return -ENOMEM;
 401         for (i = 0; i < ARRAY_SIZE(nvm_to_read); i++) {
 402                 section = nvm_to_read[i];
 403                 /* we override the constness for initial read */
 404                 ret = iwl_nvm_read_section(mvm, section, nvm_buffer);
 405                 if (ret < 0)
 406                         break;
 407                 temp = kmemdup(nvm_buffer, ret, GFP_KERNEL);
 408                 if (!temp) {
 409                         ret = -ENOMEM;
 410                         break;
 411                 }
 412                 mvm->nvm_sections[section].data = temp;
 413                 mvm->nvm_sections[section].length = ret;
 414         }
 415         kfree(nvm_buffer);
 416         if (ret < 0)
 417                 return ret;
 418
 419         mvm->nvm_data = iwl_parse_nvm_sections(mvm);
 420         if (!mvm->nvm_data)
 421                 return -ENODATA;
 422
 423         return 0;
 424 }