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 - 2011 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 - 2011 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 /******************************************************************************
  79  *
  80  * EEPROM related functions
  81  *
  82 ******************************************************************************/
  83
  84 int iwl_eeprom_check_version(struct iwl_priv *priv)
  85 {
  86         u16 eeprom_ver;
  87         u16 calib_ver;
  88
  89         eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
  90         calib_ver = iwlagn_eeprom_calib_version(priv);
  91
  92         if (eeprom_ver < priv->cfg->eeprom_ver ||
  93             calib_ver < priv->cfg->eeprom_calib_ver)
  94                 goto err;
  95
  96         IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
  97                  eeprom_ver, calib_ver);
  98
  99         return 0;
 100 err:
 101         IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x "
 102                   "CALIB=0x%x < 0x%x\n",
 103                   eeprom_ver, priv->cfg->eeprom_ver,
 104                   calib_ver,  priv->cfg->eeprom_calib_ver);
 105         return -EINVAL;
 106
 107 }
 108
 109 int iwl_eeprom_check_sku(struct iwl_priv *priv)
 110 {
 111         u16 radio_cfg;
 112
 113         if (!priv->cfg->sku) {
 114                 /* not using sku overwrite */
 115                 priv->cfg->sku = iwl_eeprom_query16(priv, EEPROM_SKU_CAP);
 116                 if (priv->cfg->sku & EEPROM_SKU_CAP_11N_ENABLE &&
 117                     !priv->cfg->ht_params) {
 118                         IWL_ERR(priv, "Invalid 11n configuration\n");
 119                         return -EINVAL;
 120                 }
 121         }
 122         if (!priv->cfg->sku) {
 123                 IWL_ERR(priv, "Invalid device sku\n");
 124                 return -EINVAL;
 125         }
 126
 127         IWL_INFO(priv, "Device SKU: 0X%x\n", priv->cfg->sku);
 128
 129         if (!priv->cfg->valid_tx_ant && !priv->cfg->valid_rx_ant) {
 130                 /* not using .cfg overwrite */
 131                 radio_cfg = iwl_eeprom_query16(priv, EEPROM_RADIO_CONFIG);
 132                 priv->cfg->valid_tx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
 133                 priv->cfg->valid_rx_ant = EEPROM_RF_CFG_RX_ANT_MSK(radio_cfg);
 134                 if (!priv->cfg->valid_tx_ant || !priv->cfg->valid_rx_ant) {
 135                         IWL_ERR(priv, "Invalid chain (0X%x, 0X%x)\n",
 136                                 priv->cfg->valid_tx_ant,
 137                                 priv->cfg->valid_rx_ant);
 138                         return -EINVAL;
 139                 }
 140                 IWL_INFO(priv, "Valid Tx ant: 0X%x, Valid Rx ant: 0X%x\n",
 141                          priv->cfg->valid_tx_ant, priv->cfg->valid_rx_ant);
 142         }
 143         /*
 144          * for some special cases,
 145          * EEPROM did not reflect the correct antenna setting
 146          * so overwrite the valid tx/rx antenna from .cfg
 147          */
 148         return 0;
 149 }
 150
 151 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
 152 {
 153         const u8 *addr = iwl_eeprom_query_addr(priv,
 154                                         EEPROM_MAC_ADDRESS);
 155         memcpy(mac, addr, ETH_ALEN);
 156 }
 157
 158 /**
 159  * iwl_get_max_txpower_avg - get the highest tx power from all chains.
 160  *     find the highest tx power from all chains for the channel
 161  */
 162 static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
 163                 struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 164                 int element, s8 *max_txpower_in_half_dbm)
 165 {
 166         s8 max_txpower_avg = 0; /* (dBm) */
 167
 168         /* Take the highest tx power from any valid chains */
 169         if ((priv->cfg->valid_tx_ant & ANT_A) &&
 170             (enhanced_txpower[element].chain_a_max > max_txpower_avg))
 171                 max_txpower_avg = enhanced_txpower[element].chain_a_max;
 172         if ((priv->cfg->valid_tx_ant & ANT_B) &&
 173             (enhanced_txpower[element].chain_b_max > max_txpower_avg))
 174                 max_txpower_avg = enhanced_txpower[element].chain_b_max;
 175         if ((priv->cfg->valid_tx_ant & ANT_C) &&
 176             (enhanced_txpower[element].chain_c_max > max_txpower_avg))
 177                 max_txpower_avg = enhanced_txpower[element].chain_c_max;
 178         if (((priv->cfg->valid_tx_ant == ANT_AB) |
 179             (priv->cfg->valid_tx_ant == ANT_BC) |
 180             (priv->cfg->valid_tx_ant == ANT_AC)) &&
 181             (enhanced_txpower[element].mimo2_max > max_txpower_avg))
 182                 max_txpower_avg =  enhanced_txpower[element].mimo2_max;
 183         if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
 184             (enhanced_txpower[element].mimo3_max > max_txpower_avg))
 185                 max_txpower_avg = enhanced_txpower[element].mimo3_max;
 186
 187         /*
 188          * max. tx power in EEPROM is in 1/2 dBm format
 189          * convert from 1/2 dBm to dBm (round-up convert)
 190          * but we also do not want to loss 1/2 dBm resolution which
 191          * will impact performance
 192          */
 193         *max_txpower_in_half_dbm = max_txpower_avg;
 194         return (max_txpower_avg & 0x01) + (max_txpower_avg >> 1);
 195 }
 196
 197 static void
 198 iwl_eeprom_enh_txp_read_element(struct iwl_priv *priv,
 199                                     struct iwl_eeprom_enhanced_txpwr *txp,
 200                                     s8 max_txpower_avg)
 201 {
 202         int ch_idx;
 203         bool is_ht40 = txp->flags & IWL_EEPROM_ENH_TXP_FL_40MHZ;
 204         enum ieee80211_band band;
 205
 206         band = txp->flags & IWL_EEPROM_ENH_TXP_FL_BAND_52G ?
 207                 IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;
 208
 209         for (ch_idx = 0; ch_idx < priv->channel_count; ch_idx++) {
 210                 struct iwl_channel_info *ch_info = &priv->channel_info[ch_idx];
 211
 212                 /* update matching channel or from common data only */
 213                 if (txp->channel != 0 && ch_info->channel != txp->channel)
 214                         continue;
 215
 216                 /* update matching band only */
 217                 if (band != ch_info->band)
 218                         continue;
 219
 220                 if (ch_info->max_power_avg < max_txpower_avg && !is_ht40) {
 221                         ch_info->max_power_avg = max_txpower_avg;
 222                         ch_info->curr_txpow = max_txpower_avg;
 223                         ch_info->scan_power = max_txpower_avg;
 224                 }
 225
 226                 if (is_ht40 && ch_info->ht40_max_power_avg < max_txpower_avg)
 227                         ch_info->ht40_max_power_avg = max_txpower_avg;
 228         }
 229 }
 230
 231 #define EEPROM_TXP_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT)
 232 #define EEPROM_TXP_ENTRY_LEN sizeof(struct iwl_eeprom_enhanced_txpwr)
 233 #define EEPROM_TXP_SZ_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT_SIZE)
 234
 235 #define TXP_CHECK_AND_PRINT(x) ((txp->flags & IWL_EEPROM_ENH_TXP_FL_##x) \
 236                             ? # x " " : "")
 237
 238 void iwl_eeprom_enhanced_txpower(struct iwl_priv *priv)
 239 {
 240         struct iwl_eeprom_enhanced_txpwr *txp_array, *txp;
 241         int idx, entries;
 242         __le16 *txp_len;
 243         s8 max_txp_avg, max_txp_avg_halfdbm;
 244
 245         BUILD_BUG_ON(sizeof(struct iwl_eeprom_enhanced_txpwr) != 8);
 246
 247         /* the length is in 16-bit words, but we want entries */
 248         txp_len = (__le16 *) iwl_eeprom_query_addr(priv, EEPROM_TXP_SZ_OFFS);
 249         entries = le16_to_cpup(txp_len) * 2 / EEPROM_TXP_ENTRY_LEN;
 250
 251         txp_array = (void *) iwl_eeprom_query_addr(priv, EEPROM_TXP_OFFS);
 252
 253         for (idx = 0; idx < entries; idx++) {
 254                 txp = &txp_array[idx];
 255                 /* skip invalid entries */
 256                 if (!(txp->flags & IWL_EEPROM_ENH_TXP_FL_VALID))
 257                         continue;
 258
 259                 IWL_DEBUG_EEPROM(priv, "%s %d:\t %s%s%s%s%s%s%s%s (0x%02x)\n",
 260                                  (txp->channel && (txp->flags &
 261                                         IWL_EEPROM_ENH_TXP_FL_COMMON_TYPE)) ?
 262                                         "Common " : (txp->channel) ?
 263                                         "Channel" : "Common",
 264                                  (txp->channel),
 265                                  TXP_CHECK_AND_PRINT(VALID),
 266                                  TXP_CHECK_AND_PRINT(BAND_52G),
 267                                  TXP_CHECK_AND_PRINT(OFDM),
 268                                  TXP_CHECK_AND_PRINT(40MHZ),
 269                                  TXP_CHECK_AND_PRINT(HT_AP),
 270                                  TXP_CHECK_AND_PRINT(RES1),
 271                                  TXP_CHECK_AND_PRINT(RES2),
 272                                  TXP_CHECK_AND_PRINT(COMMON_TYPE),
 273                                  txp->flags);
 274                 IWL_DEBUG_EEPROM(priv, "\t\t chain_A: 0x%02x "
 275                                  "chain_B: 0X%02x chain_C: 0X%02x\n",
 276                                  txp->chain_a_max, txp->chain_b_max,
 277                                  txp->chain_c_max);
 278                 IWL_DEBUG_EEPROM(priv, "\t\t MIMO2: 0x%02x "
 279                                  "MIMO3: 0x%02x High 20_on_40: 0x%02x "
 280                                  "Low 20_on_40: 0x%02x\n",
 281                                  txp->mimo2_max, txp->mimo3_max,
 282                                  ((txp->delta_20_in_40 & 0xf0) >> 4),
 283                                  (txp->delta_20_in_40 & 0x0f));
 284
 285                 max_txp_avg = iwl_get_max_txpower_avg(priv, txp_array, idx,
 286                                                       &max_txp_avg_halfdbm);
 287
 288                 /*
 289                  * Update the user limit values values to the highest
 290                  * power supported by any channel
 291                  */
 292                 if (max_txp_avg > priv->tx_power_user_lmt)
 293                         priv->tx_power_user_lmt = max_txp_avg;
 294                 if (max_txp_avg_halfdbm > priv->tx_power_lmt_in_half_dbm)
 295                         priv->tx_power_lmt_in_half_dbm = max_txp_avg_halfdbm;
 296
 297                 iwl_eeprom_enh_txp_read_element(priv, txp, max_txp_avg);
 298         }
 299 }