drivers/net/wireless/iwlwifi/iwl-power.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33
  34 #include <net/mac80211.h>
  35
  36 #include "iwl-eeprom.h"
  37 #include "iwl-dev.h"
  38 #include "iwl-core.h"
  39 #include "iwl-commands.h"
  40 #include "iwl-debug.h"
  41 #include "iwl-power.h"
  42
  43 /*
  44  * Setting power level allow the card to go to sleep when not busy
  45  * there are three factor that decide the power level to go to, they
  46  * are list here with its priority
  47  *  1- critical_power_setting this will be set according to card temperature.
  48  *  2- system_power_setting this will be set by system PM manager.
  49  *  3- user_power_setting this will be set by user either by writing to sys or
  50  *      mac80211
  51  *
  52  * if system_power_setting and user_power_setting is set to auto
  53  * the power level will be decided according to association status and battery
  54  * status.
  55  *
  56  */
  57
  58 #define MSEC_TO_USEC 1024
  59 #define IWL_POWER_RANGE_0_MAX  (2)
  60 #define IWL_POWER_RANGE_1_MAX  (10)
  61
  62
  63
  64 #define IWL_POWER_ON_BATTERY            IWL_POWER_INDEX_5
  65 #define IWL_POWER_ON_AC_DISASSOC        IWL_POWER_MODE_CAM
  66 #define IWL_POWER_ON_AC_ASSOC           IWL_POWER_MODE_CAM
  67
  68
  69 #define IWL_CT_KILL_TEMPERATURE         110
  70 #define IWL_MIN_POWER_TEMPERATURE       100
  71 #define IWL_REDUCED_POWER_TEMPERATURE   95
  72
  73 /* default power management (not Tx power) table values */
  74 /* for TIM  0-10 */
  75 static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
  76         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
  77         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  78         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  79         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  80         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  81         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  82 };
  83
  84
  85 /* for TIM = 3-10 */
  86 static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
  87         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
  88         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
  89         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
  90         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
  91         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
  92         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
  93 };
  94
  95 /* for TIM > 11 */
  96 static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
  97         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
  98         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
  99         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 100         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 101         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 102         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 103 };
 104
 105
 106 /* set card power command */
 107 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
 108 {
 109         return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
 110                                       sizeof(struct iwl_powertable_cmd),
 111                                       cmd, NULL);
 112 }
 113 /* decide the right power level according to association status
 114  * and battery status
 115  */
 116 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
 117 {
 118         u16 mode;
 119
 120         switch (priv->power_data.user_power_setting) {
 121         case IWL_POWER_AUTO:
 122                 /* if running on battery */
 123                 if (priv->power_data.is_battery_active)
 124                         mode = IWL_POWER_ON_BATTERY;
 125                 else if (iwl_is_associated(priv))
 126                         mode = IWL_POWER_ON_AC_ASSOC;
 127                 else
 128                         mode = IWL_POWER_ON_AC_DISASSOC;
 129                 break;
 130         default:
 131                 mode = priv->power_data.user_power_setting;
 132                 break;
 133         }
 134         return mode;
 135 }
 136
 137 /* initialize to default */
 138 static void iwl_power_init_handle(struct iwl_priv *priv)
 139 {
 140         struct iwl_power_mgr *pow_data;
 141         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
 142         struct iwl_powertable_cmd *cmd;
 143         int i;
 144         u16 lctl;
 145
 146         IWL_DEBUG_POWER(priv, "Initialize power \n");
 147
 148         pow_data = &priv->power_data;
 149
 150         memset(pow_data, 0, sizeof(*pow_data));
 151
 152         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
 153         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 154         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 155
 156         lctl = iwl_pcie_link_ctl(priv);
 157
 158         IWL_DEBUG_POWER(priv, "adjust power command flags\n");
 159
 160         for (i = 0; i < IWL_POWER_MAX; i++) {
 161                 cmd = &pow_data->pwr_range_0[i].cmd;
 162
 163                 if (lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
 164                         cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 165                 else
 166                         cmd->flags |= IWL_POWER_PCI_PM_MSK;
 167         }
 168 }
 169
 170 /* adjust power command according to DTIM period and power level*/
 171 static int iwl_update_power_cmd(struct iwl_priv *priv,
 172                                 struct iwl_powertable_cmd *cmd, u16 mode)
 173 {
 174         struct iwl_power_vec_entry *range;
 175         struct iwl_power_mgr *pow_data;
 176         int i;
 177         u32 max_sleep = 0;
 178         u8 period;
 179         bool skip;
 180
 181         if (mode > IWL_POWER_INDEX_5) {
 182                 IWL_DEBUG_POWER(priv, "Error invalid power mode \n");
 183                 return -EINVAL;
 184         }
 185
 186         pow_data = &priv->power_data;
 187
 188         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
 189                 range = &pow_data->pwr_range_0[0];
 190         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
 191                 range = &pow_data->pwr_range_1[0];
 192         else
 193                 range = &pow_data->pwr_range_2[0];
 194
 195         period = pow_data->dtim_period;
 196         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
 197
 198         if (period == 0) {
 199                 period = 1;
 200                 skip = false;
 201         } else {
 202                 skip = !!range[mode].no_dtim;
 203         }
 204
 205         if (skip) {
 206                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
 207                 max_sleep = le32_to_cpu(slp_itrvl);
 208                 if (max_sleep == 0xFF)
 209                         max_sleep = period * (skip + 1);
 210                 else if (max_sleep >  period)
 211                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
 212                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 213         } else {
 214                 max_sleep = period;
 215                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 216         }
 217
 218         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 219                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
 220                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
 221
 222         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 223         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 224         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 225         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 226                         le32_to_cpu(cmd->sleep_interval[0]),
 227                         le32_to_cpu(cmd->sleep_interval[1]),
 228                         le32_to_cpu(cmd->sleep_interval[2]),
 229                         le32_to_cpu(cmd->sleep_interval[3]),
 230                         le32_to_cpu(cmd->sleep_interval[4]));
 231
 232         return 0;
 233 }
 234
 235
 236 /*
 237  * compute the final power mode index
 238  */
 239 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 240 {
 241         struct iwl_power_mgr *setting = &(priv->power_data);
 242         int ret = 0;
 243         u16 uninitialized_var(final_mode);
 244         bool update_chains;
 245
 246         /* Don't update the RX chain when chain noise calibration is running */
 247         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 248                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 249
 250         /* If on battery, set to 3,
 251          * if plugged into AC power, set to CAM ("continuously aware mode"),
 252          * else user level */
 253
 254         switch (setting->system_power_setting) {
 255         case IWL_POWER_SYS_AUTO:
 256                 final_mode = iwl_get_auto_power_mode(priv);
 257                 break;
 258         case IWL_POWER_SYS_BATTERY:
 259                 final_mode = IWL_POWER_INDEX_3;
 260                 break;
 261         case IWL_POWER_SYS_AC:
 262                 final_mode = IWL_POWER_MODE_CAM;
 263                 break;
 264         default:
 265                 final_mode = IWL_POWER_INDEX_3;
 266                 WARN_ON(1);
 267         }
 268
 269         if (setting->critical_power_setting > final_mode)
 270                 final_mode = setting->critical_power_setting;
 271
 272         /* driver only support CAM for non STA network */
 273         if (priv->iw_mode != NL80211_IFTYPE_STATION)
 274                 final_mode = IWL_POWER_MODE_CAM;
 275
 276         if (iwl_is_ready_rf(priv) && !setting->power_disabled &&
 277             ((setting->power_mode != final_mode) || force)) {
 278                 struct iwl_powertable_cmd cmd;
 279
 280                 if (final_mode != IWL_POWER_MODE_CAM)
 281                         set_bit(STATUS_POWER_PMI, &priv->status);
 282
 283                 iwl_update_power_cmd(priv, &cmd, final_mode);
 284                 cmd.keep_alive_beacons = 0;
 285
 286                 if (final_mode == IWL_POWER_INDEX_5)
 287                         cmd.flags |= IWL_POWER_FAST_PD;
 288
 289                 ret = iwl_set_power(priv, &cmd);
 290
 291                 if (final_mode == IWL_POWER_MODE_CAM)
 292                         clear_bit(STATUS_POWER_PMI, &priv->status);
 293                 else
 294                         set_bit(STATUS_POWER_PMI, &priv->status);
 295
 296                 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
 297                         priv->cfg->ops->lib->update_chain_flags(priv);
 298                 else
 299                         IWL_DEBUG_POWER(priv, "Cannot update the power, chain noise "
 300                                         "calibration running: %d\n",
 301                                         priv->chain_noise_data.state);
 302                 if (!ret)
 303                         setting->power_mode = final_mode;
 304         }
 305
 306         return ret;
 307 }
 308 EXPORT_SYMBOL(iwl_power_update_mode);
 309
 310 /* Allow other iwl code to disable/enable power management active
 311  * this will be useful for rate scale to disable PM during heavy
 312  * Tx/Rx activities
 313  */
 314 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
 315 {
 316         u16 prev_mode;
 317         int ret = 0;
 318
 319         if (priv->power_data.power_disabled)
 320                 return -EBUSY;
 321
 322         prev_mode = priv->power_data.user_power_setting;
 323         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
 324         ret = iwl_power_update_mode(priv, 0);
 325         priv->power_data.power_disabled = 1;
 326         priv->power_data.user_power_setting = prev_mode;
 327         cancel_delayed_work(&priv->set_power_save);
 328         if (ms)
 329                 queue_delayed_work(priv->workqueue, &priv->set_power_save,
 330                                    msecs_to_jiffies(ms));
 331
 332
 333         return ret;
 334 }
 335 EXPORT_SYMBOL(iwl_power_disable_management);
 336
 337 /* Allow other iwl code to disable/enable power management active
 338  * this will be useful for rate scale to disable PM during high
 339  * volume activities
 340  */
 341 int iwl_power_enable_management(struct iwl_priv *priv)
 342 {
 343         int ret = 0;
 344
 345         priv->power_data.power_disabled = 0;
 346         ret = iwl_power_update_mode(priv, 0);
 347         return ret;
 348 }
 349 EXPORT_SYMBOL(iwl_power_enable_management);
 350
 351 /* set user_power_setting */
 352 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
 353 {
 354         if (mode > IWL_POWER_MAX)
 355                 return -EINVAL;
 356
 357         priv->power_data.user_power_setting = mode;
 358
 359         return iwl_power_update_mode(priv, 0);
 360 }
 361 EXPORT_SYMBOL(iwl_power_set_user_mode);
 362
 363 /* set system_power_setting. This should be set by over all
 364  * PM application.
 365  */
 366 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
 367 {
 368         if (mode < IWL_POWER_SYS_MAX)
 369                 priv->power_data.system_power_setting = mode;
 370         else
 371                 return -EINVAL;
 372         return iwl_power_update_mode(priv, 0);
 373 }
 374 EXPORT_SYMBOL(iwl_power_set_system_mode);
 375
 376 /* initialize to default */
 377 void iwl_power_initialize(struct iwl_priv *priv)
 378 {
 379         iwl_power_init_handle(priv);
 380         priv->power_data.user_power_setting = IWL_POWER_AUTO;
 381         priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
 382         priv->power_data.power_disabled = 0;
 383         priv->power_data.is_battery_active = 0;
 384         priv->power_data.critical_power_setting = 0;
 385 }
 386 EXPORT_SYMBOL(iwl_power_initialize);
 387
 388 /* set critical_power_setting according to temperature value */
 389 int iwl_power_temperature_change(struct iwl_priv *priv)
 390 {
 391         int ret = 0;
 392         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
 393         u16 new_critical = priv->power_data.critical_power_setting;
 394
 395         if (temperature > IWL_CT_KILL_TEMPERATURE)
 396                 return 0;
 397         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
 398                 new_critical = IWL_POWER_INDEX_5;
 399         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
 400                 new_critical = IWL_POWER_INDEX_3;
 401         else
 402                 new_critical = IWL_POWER_MODE_CAM;
 403
 404         if (new_critical != priv->power_data.critical_power_setting)
 405                 priv->power_data.critical_power_setting = new_critical;
 406
 407         if (priv->power_data.critical_power_setting >
 408                                 priv->power_data.power_mode)
 409                 ret = iwl_power_update_mode(priv, 0);
 410
 411         return ret;
 412 }
 413 EXPORT_SYMBOL(iwl_power_temperature_change);
 414
 415 static void iwl_bg_set_power_save(struct work_struct *work)
 416 {
 417         struct iwl_priv *priv = container_of(work,
 418                                 struct iwl_priv, set_power_save.work);
 419         IWL_DEBUG_POWER(priv, "update power\n");
 420
 421         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 422                 return;
 423
 424         mutex_lock(&priv->mutex);
 425
 426         /* on starting association we disable power management
 427          * until association, if association failed then this
 428          * timer will expire and enable PM again.
 429          */
 430         if (!iwl_is_associated(priv))
 431                 iwl_power_enable_management(priv);
 432
 433         mutex_unlock(&priv->mutex);
 434 }
 435 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
 436 {
 437         INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
 438 }
 439 EXPORT_SYMBOL(iwl_setup_power_deferred_work);
 440
 441 void iwl_power_cancel_timeout(struct iwl_priv *priv)
 442 {
 443         cancel_delayed_work(&priv->set_power_save);
 444 }
 445 EXPORT_SYMBOL(iwl_power_cancel_timeout);