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 /******************************************************************************
  79  *
  80  * EEPROM related functions
  81  *
  82 ******************************************************************************/
  83
  84 /*
  85  * The device's EEPROM semaphore prevents conflicts between driver and uCode
  86  * when accessing the EEPROM; each access is a series of pulses to/from the
  87  * EEPROM chip, not a single event, so even reads could conflict if they
  88  * weren't arbitrated by the semaphore.
  89  */
  90 int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
  91 {
  92         u16 count;
  93         int ret;
  94
  95         for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
  96                 /* Request semaphore */
  97                 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
  98                             CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
  99
 100                 /* See if we got it */
 101                 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
 102                                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 103                                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
 104                                 EEPROM_SEM_TIMEOUT);
 105                 if (ret >= 0) {
 106                         IWL_DEBUG_IO(priv,
 107                                 "Acquired semaphore after %d tries.\n",
 108                                 count+1);
 109                         return ret;
 110                 }
 111         }
 112
 113         return ret;
 114 }
 115
 116 void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
 117 {
 118         iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
 119                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
 120
 121 }
 122
 123 int iwl_eeprom_check_version(struct iwl_priv *priv)
 124 {
 125         u16 eeprom_ver;
 126         u16 calib_ver;
 127
 128         eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
 129         calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);
 130
 131         if (eeprom_ver < priv->cfg->eeprom_ver ||
 132             calib_ver < priv->cfg->eeprom_calib_ver)
 133                 goto err;
 134
 135         IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
 136                  eeprom_ver, calib_ver);
 137
 138         return 0;
 139 err:
 140         IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x "
 141                   "CALIB=0x%x < 0x%x\n",
 142                   eeprom_ver, priv->cfg->eeprom_ver,
 143                   calib_ver,  priv->cfg->eeprom_calib_ver);
 144         return -EINVAL;
 145
 146 }
 147
 148 int iwl_eeprom_check_sku(struct iwl_priv *priv)
 149 {
 150         u16 eeprom_sku;
 151         u16 radio_cfg;
 152
 153         eeprom_sku = iwl_eeprom_query16(priv, EEPROM_SKU_CAP);
 154
 155         if (!priv->cfg->sku) {
 156                 /* not using sku overwrite */
 157                 priv->cfg->sku =
 158                         ((eeprom_sku & EEPROM_SKU_CAP_BAND_SELECTION) >>
 159                         EEPROM_SKU_CAP_BAND_POS);
 160                 if (eeprom_sku & EEPROM_SKU_CAP_11N_ENABLE)
 161                         priv->cfg->sku |= IWL_SKU_N;
 162         }
 163         if (!priv->cfg->sku) {
 164                 IWL_ERR(priv, "Invalid device sku\n");
 165                 return -EINVAL;
 166         }
 167
 168         IWL_INFO(priv, "Device SKU: 0X%x\n", priv->cfg->sku);
 169
 170         if (!priv->cfg->valid_tx_ant && !priv->cfg->valid_rx_ant) {
 171                 /* not using .cfg overwrite */
 172                 radio_cfg = iwl_eeprom_query16(priv, EEPROM_RADIO_CONFIG);
 173                 priv->cfg->valid_tx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
 174                 priv->cfg->valid_rx_ant = EEPROM_RF_CFG_RX_ANT_MSK(radio_cfg);
 175                 if (!priv->cfg->valid_tx_ant || !priv->cfg->valid_rx_ant) {
 176                         IWL_ERR(priv, "Invalid chain (0X%x, 0X%x)\n",
 177                                 priv->cfg->valid_tx_ant,
 178                                 priv->cfg->valid_rx_ant);
 179                         return -EINVAL;
 180                 }
 181                 IWL_INFO(priv, "Valid Tx ant: 0X%x, Valid Rx ant: 0X%x\n",
 182                          priv->cfg->valid_tx_ant, priv->cfg->valid_rx_ant);
 183         }
 184         /*
 185          * for some special cases,
 186          * EEPROM did not reflect the correct antenna setting
 187          * so overwrite the valid tx/rx antenna from .cfg
 188          */
 189         return 0;
 190 }
 191
 192 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
 193 {
 194         const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
 195                                         EEPROM_MAC_ADDRESS);
 196         memcpy(mac, addr, ETH_ALEN);
 197 }
 198
 199 /**
 200  * iwl_get_max_txpower_avg - get the highest tx power from all chains.
 201  *     find the highest tx power from all chains for the channel
 202  */
 203 static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
 204                 struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 205                 int element, s8 *max_txpower_in_half_dbm)
 206 {
 207         s8 max_txpower_avg = 0; /* (dBm) */
 208
 209         /* Take the highest tx power from any valid chains */
 210         if ((priv->cfg->valid_tx_ant & ANT_A) &&
 211             (enhanced_txpower[element].chain_a_max > max_txpower_avg))
 212                 max_txpower_avg = enhanced_txpower[element].chain_a_max;
 213         if ((priv->cfg->valid_tx_ant & ANT_B) &&
 214             (enhanced_txpower[element].chain_b_max > max_txpower_avg))
 215                 max_txpower_avg = enhanced_txpower[element].chain_b_max;
 216         if ((priv->cfg->valid_tx_ant & ANT_C) &&
 217             (enhanced_txpower[element].chain_c_max > max_txpower_avg))
 218                 max_txpower_avg = enhanced_txpower[element].chain_c_max;
 219         if (((priv->cfg->valid_tx_ant == ANT_AB) |
 220             (priv->cfg->valid_tx_ant == ANT_BC) |
 221             (priv->cfg->valid_tx_ant == ANT_AC)) &&
 222             (enhanced_txpower[element].mimo2_max > max_txpower_avg))
 223                 max_txpower_avg =  enhanced_txpower[element].mimo2_max;
 224         if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
 225             (enhanced_txpower[element].mimo3_max > max_txpower_avg))
 226                 max_txpower_avg = enhanced_txpower[element].mimo3_max;
 227
 228         /*
 229          * max. tx power in EEPROM is in 1/2 dBm format
 230          * convert from 1/2 dBm to dBm (round-up convert)
 231          * but we also do not want to loss 1/2 dBm resolution which
 232          * will impact performance
 233          */
 234         *max_txpower_in_half_dbm = max_txpower_avg;
 235         return (max_txpower_avg & 0x01) + (max_txpower_avg >> 1);
 236 }
 237
 238 static void
 239 iwlcore_eeprom_enh_txp_read_element(struct iwl_priv *priv,
 240                                     struct iwl_eeprom_enhanced_txpwr *txp,
 241                                     s8 max_txpower_avg)
 242 {
 243         int ch_idx;
 244         bool is_ht40 = txp->flags & IWL_EEPROM_ENH_TXP_FL_40MHZ;
 245         enum ieee80211_band band;
 246
 247         band = txp->flags & IWL_EEPROM_ENH_TXP_FL_BAND_52G ?
 248                 IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;
 249
 250         for (ch_idx = 0; ch_idx < priv->channel_count; ch_idx++) {
 251                 struct iwl_channel_info *ch_info = &priv->channel_info[ch_idx];
 252
 253                 /* update matching channel or from common data only */
 254                 if (txp->channel != 0 && ch_info->channel != txp->channel)
 255                         continue;
 256
 257                 /* update matching band only */
 258                 if (band != ch_info->band)
 259                         continue;
 260
 261                 if (ch_info->max_power_avg < max_txpower_avg && !is_ht40) {
 262                         ch_info->max_power_avg = max_txpower_avg;
 263                         ch_info->curr_txpow = max_txpower_avg;
 264                         ch_info->scan_power = max_txpower_avg;
 265                 }
 266
 267                 if (is_ht40 && ch_info->ht40_max_power_avg < max_txpower_avg)
 268                         ch_info->ht40_max_power_avg = max_txpower_avg;
 269         }
 270 }
 271
 272 #define EEPROM_TXP_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT)
 273 #define EEPROM_TXP_ENTRY_LEN sizeof(struct iwl_eeprom_enhanced_txpwr)
 274 #define EEPROM_TXP_SZ_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT_SIZE)
 275
 276 #define TXP_CHECK_AND_PRINT(x) ((txp->flags & IWL_EEPROM_ENH_TXP_FL_##x) \
 277                             ? # x " " : "")
 278
 279 void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
 280 {
 281         struct iwl_eeprom_enhanced_txpwr *txp_array, *txp;
 282         int idx, entries;
 283         __le16 *txp_len;
 284         s8 max_txp_avg, max_txp_avg_halfdbm;
 285
 286         BUILD_BUG_ON(sizeof(struct iwl_eeprom_enhanced_txpwr) != 8);
 287
 288         /* the length is in 16-bit words, but we want entries */
 289         txp_len = (__le16 *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_SZ_OFFS);
 290         entries = le16_to_cpup(txp_len) * 2 / EEPROM_TXP_ENTRY_LEN;
 291
 292         txp_array = (void *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_OFFS);
 293
 294         for (idx = 0; idx < entries; idx++) {
 295                 txp = &txp_array[idx];
 296                 /* skip invalid entries */
 297                 if (!(txp->flags & IWL_EEPROM_ENH_TXP_FL_VALID))
 298                         continue;
 299
 300                 IWL_DEBUG_EEPROM(priv, "%s %d:\t %s%s%s%s%s%s%s%s (0x%02x)\n",
 301                                  (txp->channel && (txp->flags &
 302                                         IWL_EEPROM_ENH_TXP_FL_COMMON_TYPE)) ?
 303                                         "Common " : (txp->channel) ?
 304                                         "Channel" : "Common",
 305                                  (txp->channel),
 306                                  TXP_CHECK_AND_PRINT(VALID),
 307                                  TXP_CHECK_AND_PRINT(BAND_52G),
 308                                  TXP_CHECK_AND_PRINT(OFDM),
 309                                  TXP_CHECK_AND_PRINT(40MHZ),
 310                                  TXP_CHECK_AND_PRINT(HT_AP),
 311                                  TXP_CHECK_AND_PRINT(RES1),
 312                                  TXP_CHECK_AND_PRINT(RES2),
 313                                  TXP_CHECK_AND_PRINT(COMMON_TYPE),
 314                                  txp->flags);
 315                 IWL_DEBUG_EEPROM(priv, "\t\t chain_A: 0x%02x "
 316                                  "chain_B: 0X%02x chain_C: 0X%02x\n",
 317                                  txp->chain_a_max, txp->chain_b_max,
 318                                  txp->chain_c_max);
 319                 IWL_DEBUG_EEPROM(priv, "\t\t MIMO2: 0x%02x "
 320                                  "MIMO3: 0x%02x High 20_on_40: 0x%02x "
 321                                  "Low 20_on_40: 0x%02x\n",
 322                                  txp->mimo2_max, txp->mimo3_max,
 323                                  ((txp->delta_20_in_40 & 0xf0) >> 4),
 324                                  (txp->delta_20_in_40 & 0x0f));
 325
 326                 max_txp_avg = iwl_get_max_txpower_avg(priv, txp_array, idx,
 327                                                       &max_txp_avg_halfdbm);
 328
 329                 /*
 330                  * Update the user limit values values to the highest
 331                  * power supported by any channel
 332                  */
 333                 if (max_txp_avg > priv->tx_power_user_lmt)
 334                         priv->tx_power_user_lmt = max_txp_avg;
 335                 if (max_txp_avg_halfdbm > priv->tx_power_lmt_in_half_dbm)
 336                         priv->tx_power_lmt_in_half_dbm = max_txp_avg_halfdbm;
 337
 338                 iwlcore_eeprom_enh_txp_read_element(priv, txp, max_txp_avg);
 339         }
 340 }