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(priv, POWER_TABLE_CMD,
 110                                 sizeof(struct iwl_powertable_cmd), cmd);
 111 }
 112 /* decide the right power level according to association status
 113  * and battery status
 114  */
 115 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
 116 {
 117         u16 mode;
 118
 119         switch (priv->power_data.user_power_setting) {
 120         case IWL_POWER_AUTO:
 121                 /* if running on battery */
 122                 if (priv->power_data.is_battery_active)
 123                         mode = IWL_POWER_ON_BATTERY;
 124                 else if (iwl_is_associated(priv))
 125                         mode = IWL_POWER_ON_AC_ASSOC;
 126                 else
 127                         mode = IWL_POWER_ON_AC_DISASSOC;
 128                 break;
 129         default:
 130                 mode = priv->power_data.user_power_setting;
 131                 break;
 132         }
 133         return mode;
 134 }
 135
 136 /* initialize to default */
 137 static void iwl_power_init_handle(struct iwl_priv *priv)
 138 {
 139         struct iwl_power_mgr *pow_data;
 140         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
 141         struct iwl_powertable_cmd *cmd;
 142         int i;
 143         u16 lctl;
 144
 145         IWL_DEBUG_POWER(priv, "Initialize power \n");
 146
 147         pow_data = &priv->power_data;
 148
 149         memset(pow_data, 0, sizeof(*pow_data));
 150
 151         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
 152         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 153         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 154
 155         lctl = iwl_pcie_link_ctl(priv);
 156
 157         IWL_DEBUG_POWER(priv, "adjust power command flags\n");
 158
 159         for (i = 0; i < IWL_POWER_MAX; i++) {
 160                 cmd = &pow_data->pwr_range_0[i].cmd;
 161
 162                 if (lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
 163                         cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 164                 else
 165                         cmd->flags |= IWL_POWER_PCI_PM_MSK;
 166         }
 167 }
 168
 169 /* adjust power command according to DTIM period and power level*/
 170 static int iwl_update_power_cmd(struct iwl_priv *priv,
 171                                 struct iwl_powertable_cmd *cmd, u16 mode)
 172 {
 173         struct iwl_power_vec_entry *range;
 174         struct iwl_power_mgr *pow_data;
 175         int i;
 176         u32 max_sleep = 0;
 177         u8 period;
 178         bool skip;
 179
 180         if (mode > IWL_POWER_INDEX_5) {
 181                 IWL_DEBUG_POWER(priv, "Error invalid power mode \n");
 182                 return -EINVAL;
 183         }
 184
 185         pow_data = &priv->power_data;
 186
 187         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
 188                 range = &pow_data->pwr_range_0[0];
 189         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
 190                 range = &pow_data->pwr_range_1[0];
 191         else
 192                 range = &pow_data->pwr_range_2[0];
 193
 194         period = pow_data->dtim_period;
 195         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
 196
 197         if (period == 0) {
 198                 period = 1;
 199                 skip = false;
 200         } else {
 201                 skip = !!range[mode].no_dtim;
 202         }
 203
 204         if (skip) {
 205                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
 206                 max_sleep = le32_to_cpu(slp_itrvl);
 207                 if (max_sleep == 0xFF)
 208                         max_sleep = period * (skip + 1);
 209                 else if (max_sleep >  period)
 210                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
 211                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 212         } else {
 213                 max_sleep = period;
 214                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 215         }
 216
 217         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 218                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
 219                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
 220
 221         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 222         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 223         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 224         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 225                         le32_to_cpu(cmd->sleep_interval[0]),
 226                         le32_to_cpu(cmd->sleep_interval[1]),
 227                         le32_to_cpu(cmd->sleep_interval[2]),
 228                         le32_to_cpu(cmd->sleep_interval[3]),
 229                         le32_to_cpu(cmd->sleep_interval[4]));
 230
 231         return 0;
 232 }
 233
 234
 235 /*
 236  * compute the final power mode index
 237  */
 238 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 239 {
 240         struct iwl_power_mgr *setting = &(priv->power_data);
 241         int ret = 0;
 242         u16 uninitialized_var(final_mode);
 243         bool update_chains;
 244
 245         /* Don't update the RX chain when chain noise calibration is running */
 246         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 247                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 248
 249         /* If on battery, set to 3,
 250          * if plugged into AC power, set to CAM ("continuously aware mode"),
 251          * else user level */
 252
 253         switch (setting->system_power_setting) {
 254         case IWL_POWER_SYS_AUTO:
 255                 final_mode = iwl_get_auto_power_mode(priv);
 256                 break;
 257         case IWL_POWER_SYS_BATTERY:
 258                 final_mode = IWL_POWER_INDEX_3;
 259                 break;
 260         case IWL_POWER_SYS_AC:
 261                 final_mode = IWL_POWER_MODE_CAM;
 262                 break;
 263         default:
 264                 final_mode = IWL_POWER_INDEX_3;
 265                 WARN_ON(1);
 266         }
 267
 268         if (setting->critical_power_setting > final_mode)
 269                 final_mode = setting->critical_power_setting;
 270
 271         /* driver only support CAM for non STA network */
 272         if (priv->iw_mode != NL80211_IFTYPE_STATION)
 273                 final_mode = IWL_POWER_MODE_CAM;
 274
 275         if (iwl_is_ready_rf(priv) && !setting->power_disabled &&
 276             ((setting->power_mode != final_mode) || force)) {
 277                 struct iwl_powertable_cmd cmd;
 278
 279                 if (final_mode != IWL_POWER_MODE_CAM)
 280                         set_bit(STATUS_POWER_PMI, &priv->status);
 281
 282                 iwl_update_power_cmd(priv, &cmd, final_mode);
 283                 cmd.keep_alive_beacons = 0;
 284
 285                 if (final_mode == IWL_POWER_INDEX_5)
 286                         cmd.flags |= IWL_POWER_FAST_PD;
 287
 288                 ret = iwl_set_power(priv, &cmd);
 289
 290                 if (final_mode == IWL_POWER_MODE_CAM)
 291                         clear_bit(STATUS_POWER_PMI, &priv->status);
 292                 else
 293                         set_bit(STATUS_POWER_PMI, &priv->status);
 294
 295                 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
 296                         priv->cfg->ops->lib->update_chain_flags(priv);
 297                 else
 298                         IWL_DEBUG_POWER(priv, "Cannot update the power, chain noise "
 299                                         "calibration running: %d\n",
 300                                         priv->chain_noise_data.state);
 301                 if (!ret)
 302                         setting->power_mode = final_mode;
 303         }
 304
 305         return ret;
 306 }
 307 EXPORT_SYMBOL(iwl_power_update_mode);
 308
 309 /* Allow other iwl code to disable/enable power management active
 310  * this will be useful for rate scale to disable PM during heavy
 311  * Tx/Rx activities
 312  */
 313 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
 314 {
 315         u16 prev_mode;
 316         int ret = 0;
 317
 318         if (priv->power_data.power_disabled)
 319                 return -EBUSY;
 320
 321         prev_mode = priv->power_data.user_power_setting;
 322         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
 323         ret = iwl_power_update_mode(priv, 0);
 324         priv->power_data.power_disabled = 1;
 325         priv->power_data.user_power_setting = prev_mode;
 326         cancel_delayed_work(&priv->set_power_save);
 327         if (ms)
 328                 queue_delayed_work(priv->workqueue, &priv->set_power_save,
 329                                    msecs_to_jiffies(ms));
 330
 331
 332         return ret;
 333 }
 334 EXPORT_SYMBOL(iwl_power_disable_management);
 335
 336 /* Allow other iwl code to disable/enable power management active
 337  * this will be useful for rate scale to disable PM during high
 338  * volume activities
 339  */
 340 int iwl_power_enable_management(struct iwl_priv *priv)
 341 {
 342         int ret = 0;
 343
 344         priv->power_data.power_disabled = 0;
 345         ret = iwl_power_update_mode(priv, 0);
 346         return ret;
 347 }
 348 EXPORT_SYMBOL(iwl_power_enable_management);
 349
 350 /* set user_power_setting */
 351 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
 352 {
 353         if (mode > IWL_POWER_MAX)
 354                 return -EINVAL;
 355
 356         priv->power_data.user_power_setting = mode;
 357
 358         return iwl_power_update_mode(priv, 0);
 359 }
 360 EXPORT_SYMBOL(iwl_power_set_user_mode);
 361
 362 /* set system_power_setting. This should be set by over all
 363  * PM application.
 364  */
 365 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
 366 {
 367         if (mode < IWL_POWER_SYS_MAX)
 368                 priv->power_data.system_power_setting = mode;
 369         else
 370                 return -EINVAL;
 371         return iwl_power_update_mode(priv, 0);
 372 }
 373 EXPORT_SYMBOL(iwl_power_set_system_mode);
 374
 375 /* initialize to default */
 376 void iwl_power_initialize(struct iwl_priv *priv)
 377 {
 378         iwl_power_init_handle(priv);
 379         priv->power_data.user_power_setting = IWL_POWER_AUTO;
 380         priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
 381         priv->power_data.power_disabled = 0;
 382         priv->power_data.is_battery_active = 0;
 383         priv->power_data.critical_power_setting = 0;
 384 }
 385 EXPORT_SYMBOL(iwl_power_initialize);
 386
 387 /* set critical_power_setting according to temperature value */
 388 int iwl_power_temperature_change(struct iwl_priv *priv)
 389 {
 390         int ret = 0;
 391         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
 392         u16 new_critical = priv->power_data.critical_power_setting;
 393
 394         if (temperature > IWL_CT_KILL_TEMPERATURE)
 395                 return 0;
 396         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
 397                 new_critical = IWL_POWER_INDEX_5;
 398         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
 399                 new_critical = IWL_POWER_INDEX_3;
 400         else
 401                 new_critical = IWL_POWER_MODE_CAM;
 402
 403         if (new_critical != priv->power_data.critical_power_setting)
 404                 priv->power_data.critical_power_setting = new_critical;
 405
 406         if (priv->power_data.critical_power_setting >
 407                                 priv->power_data.power_mode)
 408                 ret = iwl_power_update_mode(priv, 0);
 409
 410         return ret;
 411 }
 412 EXPORT_SYMBOL(iwl_power_temperature_change);
 413
 414 static void iwl_bg_set_power_save(struct work_struct *work)
 415 {
 416         struct iwl_priv *priv = container_of(work,
 417                                 struct iwl_priv, set_power_save.work);
 418         IWL_DEBUG_POWER(priv, "update power\n");
 419
 420         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 421                 return;
 422
 423         mutex_lock(&priv->mutex);
 424
 425         /* on starting association we disable power management
 426          * until association, if association failed then this
 427          * timer will expire and enable PM again.
 428          */
 429         if (!iwl_is_associated(priv))
 430                 iwl_power_enable_management(priv);
 431
 432         mutex_unlock(&priv->mutex);
 433 }
 434 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
 435 {
 436         INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
 437 }
 438 EXPORT_SYMBOL(iwl_setup_power_deferred_work);
 439
 440 void iwl_power_cancel_timeout(struct iwl_priv *priv)
 441 {
 442         cancel_delayed_work(&priv->set_power_save);
 443 }
 444 EXPORT_SYMBOL(iwl_power_cancel_timeout);