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         priv->cfg->sku = ((eeprom_sku & EEPROM_SKU_CAP_BAND_SELECTION) >>
 156                         EEPROM_SKU_CAP_BAND_POS);
 157         if (eeprom_sku & EEPROM_SKU_CAP_11N_ENABLE)
 158                 priv->cfg->sku |= IWL_SKU_N;
 159
 160         if (!priv->cfg->sku) {
 161                 IWL_ERR(priv, "Invalid device sku\n");
 162                 return -EINVAL;
 163         }
 164
 165         IWL_INFO(priv, "Device SKU: 0X%x\n", priv->cfg->sku);
 166
 167         if (!priv->cfg->valid_tx_ant && !priv->cfg->valid_rx_ant) {
 168                 /* not using .cfg overwrite */
 169                 radio_cfg = iwl_eeprom_query16(priv, EEPROM_RADIO_CONFIG);
 170                 priv->cfg->valid_tx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
 171                 priv->cfg->valid_rx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
 172                 if (!priv->cfg->valid_tx_ant || !priv->cfg->valid_rx_ant) {
 173                         IWL_ERR(priv, "Invalid chain (0X%x, 0X%x)\n",
 174                                 priv->cfg->valid_tx_ant,
 175                                 priv->cfg->valid_rx_ant);
 176                         return -EINVAL;
 177                 }
 178                 IWL_INFO(priv, "Valid Tx ant: 0X%x, Valid Rx ant: 0X%x\n",
 179                          priv->cfg->valid_tx_ant, priv->cfg->valid_rx_ant);
 180         }
 181         /*
 182          * for some special cases,
 183          * EEPROM did not reflect the correct antenna setting
 184          * so overwrite the valid tx/rx antenna from .cfg
 185          */
 186         return 0;
 187 }
 188
 189 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
 190 {
 191         const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
 192                                         EEPROM_MAC_ADDRESS);
 193         memcpy(mac, addr, ETH_ALEN);
 194 }
 195
 196 /**
 197  * iwl_get_max_txpower_avg - get the highest tx power from all chains.
 198  *     find the highest tx power from all chains for the channel
 199  */
 200 static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
 201                 struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
 202                 int element, s8 *max_txpower_in_half_dbm)
 203 {
 204         s8 max_txpower_avg = 0; /* (dBm) */
 205
 206         IWL_DEBUG_INFO(priv, "%d - "
 207                         "chain_a: %d dB chain_b: %d dB "
 208                         "chain_c: %d dB mimo2: %d dB mimo3: %d dB\n",
 209                         element,
 210                         enhanced_txpower[element].chain_a_max >> 1,
 211                         enhanced_txpower[element].chain_b_max >> 1,
 212                         enhanced_txpower[element].chain_c_max >> 1,
 213                         enhanced_txpower[element].mimo2_max >> 1,
 214                         enhanced_txpower[element].mimo3_max >> 1);
 215         /* Take the highest tx power from any valid chains */
 216         if ((priv->cfg->valid_tx_ant & ANT_A) &&
 217             (enhanced_txpower[element].chain_a_max > max_txpower_avg))
 218                 max_txpower_avg = enhanced_txpower[element].chain_a_max;
 219         if ((priv->cfg->valid_tx_ant & ANT_B) &&
 220             (enhanced_txpower[element].chain_b_max > max_txpower_avg))
 221                 max_txpower_avg = enhanced_txpower[element].chain_b_max;
 222         if ((priv->cfg->valid_tx_ant & ANT_C) &&
 223             (enhanced_txpower[element].chain_c_max > max_txpower_avg))
 224                 max_txpower_avg = enhanced_txpower[element].chain_c_max;
 225         if (((priv->cfg->valid_tx_ant == ANT_AB) |
 226             (priv->cfg->valid_tx_ant == ANT_BC) |
 227             (priv->cfg->valid_tx_ant == ANT_AC)) &&
 228             (enhanced_txpower[element].mimo2_max > max_txpower_avg))
 229                 max_txpower_avg =  enhanced_txpower[element].mimo2_max;
 230         if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
 231             (enhanced_txpower[element].mimo3_max > max_txpower_avg))
 232                 max_txpower_avg = enhanced_txpower[element].mimo3_max;
 233
 234         /*
 235          * max. tx power in EEPROM is in 1/2 dBm format
 236          * convert from 1/2 dBm to dBm (round-up convert)
 237          * but we also do not want to loss 1/2 dBm resolution which
 238          * will impact performance
 239          */
 240         *max_txpower_in_half_dbm = max_txpower_avg;
 241         return (max_txpower_avg & 0x01) + (max_txpower_avg >> 1);
 242 }
 243
 244 static void
 245 iwlcore_eeprom_enh_txp_read_element(struct iwl_priv *priv,
 246                                     struct iwl_eeprom_enhanced_txpwr *txp,
 247                                     s8 max_txpower_avg)
 248 {
 249         int ch_idx;
 250         bool is_ht40 = txp->flags & IWL_EEPROM_ENH_TXP_FL_40MHZ;
 251         enum ieee80211_band band;
 252
 253         band = txp->flags & IWL_EEPROM_ENH_TXP_FL_BAND_52G ?
 254                 IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;
 255
 256         for (ch_idx = 0; ch_idx < priv->channel_count; ch_idx++) {
 257                 struct iwl_channel_info *ch_info = &priv->channel_info[ch_idx];
 258
 259                 /* update matching channel or from common data only */
 260                 if (txp->channel != 0 && ch_info->channel != txp->channel)
 261                         continue;
 262
 263                 /* update matching band only */
 264                 if (band != ch_info->band)
 265                         continue;
 266
 267                 if (ch_info->max_power_avg < max_txpower_avg && !is_ht40) {
 268                         ch_info->max_power_avg = max_txpower_avg;
 269                         ch_info->curr_txpow = max_txpower_avg;
 270                         ch_info->scan_power = max_txpower_avg;
 271                 }
 272
 273                 if (is_ht40 && ch_info->ht40_max_power_avg < max_txpower_avg)
 274                         ch_info->ht40_max_power_avg = max_txpower_avg;
 275         }
 276 }
 277
 278 #define EEPROM_TXP_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT)
 279 #define EEPROM_TXP_ENTRY_LEN sizeof(struct iwl_eeprom_enhanced_txpwr)
 280 #define EEPROM_TXP_SZ_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT_SIZE)
 281
 282 void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
 283 {
 284         struct iwl_eeprom_enhanced_txpwr *txp_array, *txp;
 285         int idx, entries;
 286         __le16 *txp_len;
 287         s8 max_txp_avg, max_txp_avg_halfdbm;
 288
 289         BUILD_BUG_ON(sizeof(struct iwl_eeprom_enhanced_txpwr) != 8);
 290
 291         /* the length is in 16-bit words, but we want entries */
 292         txp_len = (__le16 *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_SZ_OFFS);
 293         entries = le16_to_cpup(txp_len) * 2 / EEPROM_TXP_ENTRY_LEN;
 294
 295         txp_array = (void *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_OFFS);
 296         for (idx = 0; idx < entries; idx++) {
 297                 txp = &txp_array[idx];
 298
 299                 /* skip invalid entries */
 300                 if (!(txp->flags & IWL_EEPROM_ENH_TXP_FL_VALID))
 301                         continue;
 302
 303                 max_txp_avg = iwl_get_max_txpower_avg(priv, txp_array, idx,
 304                                                       &max_txp_avg_halfdbm);
 305
 306                 /*
 307                  * Update the user limit values values to the highest
 308                  * power supported by any channel
 309                  */
 310                 if (max_txp_avg > priv->tx_power_user_lmt)
 311                         priv->tx_power_user_lmt = max_txp_avg;
 312                 if (max_txp_avg_halfdbm > priv->tx_power_lmt_in_half_dbm)
 313                         priv->tx_power_lmt_in_half_dbm = max_txp_avg_halfdbm;
 314
 315                 iwlcore_eeprom_enh_txp_read_element(priv, txp, max_txp_avg);
 316         }
 317 }