drivers/net/wireless/iwlwifi/iwl-agn-eeprom.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called LICENSE.GPL.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *****************************************************************************/
  62
  63
  64 #include <linux/kernel.h>
  65 #include <linux/module.h>
  66 #include <linux/slab.h>
  67 #include <linux/init.h>
  68
  69 #include <net/mac80211.h>
  70
  71 #include "iwl-commands.h"
  72 #include "iwl-dev.h"
  73 #include "iwl-core.h"
  74 #include "iwl-debug.h"
  75 #include "iwl-agn.h"
  76 #include "iwl-io.h"
  77
  78 /************************** EEPROM BANDS ****************************
  79  *
  80  * The iwl_eeprom_band definitions below provide the mapping from the
  81  * EEPROM contents to the specific channel number supported for each
  82  * band.
  83  *
  84  * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
  85  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
  86  * The specific geography and calibration information for that channel
  87  * is contained in the eeprom map itself.
  88  *
  89  * During init, we copy the eeprom information and channel map
  90  * information into priv->channel_info_24/52 and priv->channel_map_24/52
  91  *
  92  * channel_map_24/52 provides the index in the channel_info array for a
  93  * given channel.  We have to have two separate maps as there is channel
  94  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
  95  * band_2
  96  *
  97  * A value of 0xff stored in the channel_map indicates that the channel
  98  * is not supported by the hardware at all.
  99  *
 100  * A value of 0xfe in the channel_map indicates that the channel is not
 101  * valid for Tx with the current hardware.  This means that
 102  * while the system can tune and receive on a given channel, it may not
 103  * be able to associate or transmit any frames on that
 104  * channel.  There is no corresponding channel information for that
 105  * entry.
 106  *
 107  *********************************************************************/
 108
 109 /**
 110  * struct iwl_txpwr_section: eeprom section information
 111  * @offset: indirect address into eeprom image
 112  * @count: number of "struct iwl_eeprom_enhanced_txpwr" in this section
 113  * @band: band type for the section
 114  * @is_common - true: common section, false: channel section
 115  * @is_cck - true: cck section, false: not cck section
 116  * @is_ht_40 - true: all channel in the section are HT40 channel,
 117  *             false: legacy or HT 20 MHz
 118  *             ignore if it is common section
 119  * @iwl_eeprom_section_channel: channel array in the section,
 120  *             ignore if common section
 121  */
 122 struct iwl_txpwr_section {
 123         u32 offset;
 124         u8 count;
 125         enum ieee80211_band band;
 126         bool is_common;
 127         bool is_cck;
 128         bool is_ht40;
 129         u8 iwl_eeprom_section_channel[EEPROM_MAX_TXPOWER_SECTION_ELEMENTS];
 130 };
 131
 132 /**
 133  * section 1 - 3 are regulatory tx power apply to all channels based on
 134  *    modulation: CCK, OFDM
 135  *    Band: 2.4GHz, 5.2GHz
 136  * section 4 - 10 are regulatory tx power apply to specified channels
 137  *    For example:
 138  *      1L - Channel 1 Legacy
 139  *      1HT - Channel 1 HT
 140  *      (1,+1) - Channel 1 HT40 "_above_"
 141  *
 142  * Section 1: all CCK channels
 143  * Section 2: all 2.4 GHz OFDM (Legacy, HT and HT40) channels
 144  * Section 3: all 5.2 GHz OFDM (Legacy, HT and HT40) channels
 145  * Section 4: 2.4 GHz 20MHz channels: 1L, 1HT, 2L, 2HT, 10L, 10HT, 11L, 11HT
 146  * Section 5: 2.4 GHz 40MHz channels: (1,+1) (2,+1) (6,+1) (7,+1) (9,+1)
 147  * Section 6: 5.2 GHz 20MHz channels: 36L, 64L, 100L, 36HT, 64HT, 100HT
 148  * Section 7: 5.2 GHz 40MHz channels: (36,+1) (60,+1) (100,+1)
 149  * Section 8: 2.4 GHz channel: 13L, 13HT
 150  * Section 9: 2.4 GHz channel: 140L, 140HT
 151  * Section 10: 2.4 GHz 40MHz channels: (132,+1)  (44,+1)
 152  *
 153  */
 154 static const struct iwl_txpwr_section enhinfo[] = {
 155         { EEPROM_LB_CCK_20_COMMON, 1, IEEE80211_BAND_2GHZ, true, true, false },
 156         { EEPROM_LB_OFDM_COMMON, 3, IEEE80211_BAND_2GHZ, true, false, false },
 157         { EEPROM_HB_OFDM_COMMON, 3, IEEE80211_BAND_5GHZ, true, false, false },
 158         { EEPROM_LB_OFDM_20_BAND, 8, IEEE80211_BAND_2GHZ,
 159                 false, false, false,
 160                 {1, 1, 2, 2, 10, 10, 11, 11 } },
 161         { EEPROM_LB_OFDM_HT40_BAND, 5, IEEE80211_BAND_2GHZ,
 162                 false, false, true,
 163                 { 1, 2, 6, 7, 9 } },
 164         { EEPROM_HB_OFDM_20_BAND, 6, IEEE80211_BAND_5GHZ,
 165                 false, false, false,
 166                 { 36, 64, 100, 36, 64, 100 } },
 167         { EEPROM_HB_OFDM_HT40_BAND, 3, IEEE80211_BAND_5GHZ,
 168                 false, false, true,
 169                 { 36, 60, 100 } },
 170         { EEPROM_LB_OFDM_20_CHANNEL_13, 2, IEEE80211_BAND_2GHZ,
 171                 false, false, false,
 172                 { 13, 13 } },
 173         { EEPROM_HB_OFDM_20_CHANNEL_140, 2, IEEE80211_BAND_5GHZ,
 174                 false, false, false,
 175                 { 140, 140 } },
 176         { EEPROM_HB_OFDM_HT40_BAND_1, 2, IEEE80211_BAND_5GHZ,
 177                 false, false, true,
 178                 { 132, 44 } },
 179 };
 180
 181 /******************************************************************************
 182  *
 183  * EEPROM related functions
 184  *
 185 ******************************************************************************/
 186
 187 /*
 188  * The device's EEPROM semaphore prevents conflicts between driver and uCode
 189  * when accessing the EEPROM; each access is a series of pulses to/from the
 190  * EEPROM chip, not a single event, so even reads could conflict if they
 191  * weren't arbitrated by the semaphore.
 192  */
 193 int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
 194 {
 195         u16 count;
 196         int ret;
 197
 198         for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
 199                 /* Request semaphore */
 200                 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
 201                             CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 202
 203                 /* See if we got it */
 204                 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
 205                                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 206                                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 207                                 EEPROM_SEM_TIMEOUT);
 208                 if (ret >= 0) {
 209                         IWL_DEBUG_IO(priv,
 210                                 "Acquired semaphore after %d tries.\n",
 211                                 count+1);
 212                         return ret;
 213                 }
 214         }
 215
 216         return ret;
 217 }
 218
 219 void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
 220 {
 221         iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
 222                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 223
 224 }
 225
 226 int iwl_eeprom_check_version(struct iwl_priv *priv)
 227 {
 228         u16 eeprom_ver;
 229         u16 calib_ver;
 230
 231         eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
 232         calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);
 233
 234         if (eeprom_ver < priv->cfg->eeprom_ver ||
 235             calib_ver < priv->cfg->eeprom_calib_ver)
 236                 goto err;
 237
 238         IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
 239                  eeprom_ver, calib_ver);
 240
 241         return 0;
 242 err:
 243         IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x "
 244                   "CALIB=0x%x < 0x%x\n",
 245                   eeprom_ver, priv->cfg->eeprom_ver,
 246                   calib_ver,  priv->cfg->eeprom_calib_ver);
 247         return -EINVAL;
 248
 249 }
 250
 251 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
 252 {
 253         const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
 254                                         EEPROM_MAC_ADDRESS);
 255         memcpy(mac, addr, ETH_ALEN);
 256 }
 257
 258 /**
 259  * iwl_get_max_txpower_avg - get the highest tx power from all chains.
 260  *     find the highest tx power from all chains for the channel
 261  */
 262 static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
 263                 struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 264                 int element, s8 *max_txpower_in_half_dbm)
 265 {
 266         s8 max_txpower_avg = 0; /* (dBm) */
 267
 268         IWL_DEBUG_INFO(priv, "%d - "
 269                         "chain_a: %d dB chain_b: %d dB "
 270                         "chain_c: %d dB mimo2: %d dB mimo3: %d dB\n",
 271                         element,
 272                         enhanced_txpower[element].chain_a_max >> 1,
 273                         enhanced_txpower[element].chain_b_max >> 1,
 274                         enhanced_txpower[element].chain_c_max >> 1,
 275                         enhanced_txpower[element].mimo2_max >> 1,
 276                         enhanced_txpower[element].mimo3_max >> 1);
 277         /* Take the highest tx power from any valid chains */
 278         if ((priv->cfg->valid_tx_ant & ANT_A) &&
 279             (enhanced_txpower[element].chain_a_max > max_txpower_avg))
 280                 max_txpower_avg = enhanced_txpower[element].chain_a_max;
 281         if ((priv->cfg->valid_tx_ant & ANT_B) &&
 282             (enhanced_txpower[element].chain_b_max > max_txpower_avg))
 283                 max_txpower_avg = enhanced_txpower[element].chain_b_max;
 284         if ((priv->cfg->valid_tx_ant & ANT_C) &&
 285             (enhanced_txpower[element].chain_c_max > max_txpower_avg))
 286                 max_txpower_avg = enhanced_txpower[element].chain_c_max;
 287         if (((priv->cfg->valid_tx_ant == ANT_AB) |
 288             (priv->cfg->valid_tx_ant == ANT_BC) |
 289             (priv->cfg->valid_tx_ant == ANT_AC)) &&
 290             (enhanced_txpower[element].mimo2_max > max_txpower_avg))
 291                 max_txpower_avg =  enhanced_txpower[element].mimo2_max;
 292         if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
 293             (enhanced_txpower[element].mimo3_max > max_txpower_avg))
 294                 max_txpower_avg = enhanced_txpower[element].mimo3_max;
 295
 296         /*
 297          * max. tx power in EEPROM is in 1/2 dBm format
 298          * convert from 1/2 dBm to dBm (round-up convert)
 299          * but we also do not want to loss 1/2 dBm resolution which
 300          * will impact performance
 301          */
 302         *max_txpower_in_half_dbm = max_txpower_avg;
 303         return (max_txpower_avg & 0x01) + (max_txpower_avg >> 1);
 304 }
 305
 306 /**
 307  * iwl_update_common_txpower: update channel tx power
 308  *     update tx power per band based on EEPROM enhanced tx power info.
 309  */
 310 static s8 iwl_update_common_txpower(struct iwl_priv *priv,
 311                 struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 312                 int section, int element, s8 *max_txpower_in_half_dbm)
 313 {
 314         struct iwl_channel_info *ch_info;
 315         int ch;
 316         bool is_ht40 = false;
 317         s8 max_txpower_avg; /* (dBm) */
 318
 319         /* it is common section, contain all type (Legacy, HT and HT40)
 320          * based on the element in the section to determine
 321          * is it HT 40 or not
 322          */
 323         if (element == EEPROM_TXPOWER_COMMON_HT40_INDEX)
 324                 is_ht40 = true;
 325         max_txpower_avg =
 326                 iwl_get_max_txpower_avg(priv, enhanced_txpower,
 327                                         element, max_txpower_in_half_dbm);
 328
 329         ch_info = priv->channel_info;
 330
 331         for (ch = 0; ch < priv->channel_count; ch++) {
 332                 /* find matching band and update tx power if needed */
 333                 if ((ch_info->band == enhinfo[section].band) &&
 334                     (ch_info->max_power_avg < max_txpower_avg) &&
 335                     (!is_ht40)) {
 336                         /* Update regulatory-based run-time data */
 337                         ch_info->max_power_avg = ch_info->curr_txpow =
 338                                 max_txpower_avg;
 339                         ch_info->scan_power = max_txpower_avg;
 340                 }
 341                 if ((ch_info->band == enhinfo[section].band) && is_ht40 &&
 342                     (ch_info->ht40_max_power_avg < max_txpower_avg)) {
 343                         /* Update regulatory-based run-time data */
 344                         ch_info->ht40_max_power_avg = max_txpower_avg;
 345                 }
 346                 ch_info++;
 347         }
 348         return max_txpower_avg;
 349 }
 350
 351 /**
 352  * iwl_update_channel_txpower: update channel tx power
 353  *      update channel tx power based on EEPROM enhanced tx power info.
 354  */
 355 static s8 iwl_update_channel_txpower(struct iwl_priv *priv,
 356                 struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 357                 int section, int element, s8 *max_txpower_in_half_dbm)
 358 {
 359         struct iwl_channel_info *ch_info;
 360         int ch;
 361         u8 channel;
 362         s8 max_txpower_avg; /* (dBm) */
 363
 364         channel = enhinfo[section].iwl_eeprom_section_channel[element];
 365         max_txpower_avg =
 366                 iwl_get_max_txpower_avg(priv, enhanced_txpower,
 367                                         element, max_txpower_in_half_dbm);
 368
 369         ch_info = priv->channel_info;
 370         for (ch = 0; ch < priv->channel_count; ch++) {
 371                 /* find matching channel and update tx power if needed */
 372                 if (ch_info->channel == channel) {
 373                         if ((ch_info->max_power_avg < max_txpower_avg) &&
 374                             (!enhinfo[section].is_ht40)) {
 375                                 /* Update regulatory-based run-time data */
 376                                 ch_info->max_power_avg = max_txpower_avg;
 377                                 ch_info->curr_txpow = max_txpower_avg;
 378                                 ch_info->scan_power = max_txpower_avg;
 379                         }
 380                         if ((enhinfo[section].is_ht40) &&
 381                             (ch_info->ht40_max_power_avg < max_txpower_avg)) {
 382                                 /* Update regulatory-based run-time data */
 383                                 ch_info->ht40_max_power_avg = max_txpower_avg;
 384                         }
 385                         break;
 386                 }
 387                 ch_info++;
 388         }
 389         return max_txpower_avg;
 390 }
 391
 392 /**
 393  * iwlcore_eeprom_enhanced_txpower: process enhanced tx power info
 394  */
 395 void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
 396 {
 397         int eeprom_section_count = 0;
 398         int section, element;
 399         struct iwl_eeprom_enhanced_txpwr *enhanced_txpower;
 400         u32 offset;
 401         s8 max_txpower_avg; /* (dBm) */
 402         s8 max_txpower_in_half_dbm; /* (half-dBm) */
 403
 404         /* Loop through all the sections
 405          * adjust bands and channel's max tx power
 406          * Set the tx_power_user_lmt to the highest power
 407          * supported by any channels and chains
 408          */
 409         for (section = 0; section < ARRAY_SIZE(enhinfo); section++) {
 410                 eeprom_section_count = enhinfo[section].count;
 411                 offset = enhinfo[section].offset;
 412                 enhanced_txpower = (struct iwl_eeprom_enhanced_txpwr *)
 413                                 iwl_eeprom_query_addr(priv, offset);
 414
 415                 /*
 416                  * check for valid entry -
 417                  * different version of EEPROM might contain different set
 418                  * of enhanced tx power table
 419                  * always check for valid entry before process
 420                  * the information
 421                  */
 422                 if (!enhanced_txpower->common || enhanced_txpower->reserved)
 423                         continue;
 424
 425                 for (element = 0; element < eeprom_section_count; element++) {
 426                         if (enhinfo[section].is_common)
 427                                 max_txpower_avg =
 428                                         iwl_update_common_txpower(priv,
 429                                                 enhanced_txpower, section,
 430                                                 element,
 431                                                 &max_txpower_in_half_dbm);
 432                         else
 433                                 max_txpower_avg =
 434                                         iwl_update_channel_txpower(priv,
 435                                                 enhanced_txpower, section,
 436                                                 element,
 437                                                 &max_txpower_in_half_dbm);
 438
 439                         /* Update the tx_power_user_lmt to the highest power
 440                          * supported by any channel */
 441                         if (max_txpower_avg > priv->tx_power_user_lmt)
 442                                 priv->tx_power_user_lmt = max_txpower_avg;
 443
 444                         /*
 445                          * Update the tx_power_lmt_in_half_dbm to
 446                          * the highest power supported by any channel
 447                          */
 448                         if (max_txpower_in_half_dbm >
 449                             priv->tx_power_lmt_in_half_dbm)
 450                                 priv->tx_power_lmt_in_half_dbm =
 451                                         max_txpower_in_half_dbm;
 452                 }
 453         }
 454 }