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 /* set card power command */
 106 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
 107 {
 108         return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
 109                                       sizeof(struct iwl_powertable_cmd),
 110                                       cmd, NULL);
 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         /* FIXME: remove battery and ac from here */
 130         case IWL_POWER_BATTERY:
 131                 mode = IWL_POWER_INDEX_3;
 132                 break;
 133         case IWL_POWER_AC:
 134                 mode = IWL_POWER_MODE_CAM;
 135                 break;
 136         default:
 137                 mode = priv->power_data.user_power_setting;
 138                 break;
 139         }
 140         return mode;
 141 }
 142
 143 /* initialize to default */
 144 static void iwl_power_init_handle(struct iwl_priv *priv)
 145 {
 146         struct iwl_power_mgr *pow_data;
 147         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
 148         struct iwl_powertable_cmd *cmd;
 149         int i;
 150         u16 pci_pm;
 151
 152         IWL_DEBUG_POWER(priv, "Initialize power \n");
 153
 154         pow_data = &priv->power_data;
 155
 156         memset(pow_data, 0, sizeof(*pow_data));
 157
 158         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
 159         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 160         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 161
 162         pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &pci_pm);
 163
 164         IWL_DEBUG_POWER(priv, "adjust power command flags\n");
 165
 166         for (i = 0; i < IWL_POWER_MAX; i++) {
 167                 cmd = &pow_data->pwr_range_0[i].cmd;
 168
 169                 if (pci_pm & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
 170                         cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 171                 else
 172                         cmd->flags |= IWL_POWER_PCI_PM_MSK;
 173         }
 174 }
 175
 176 /* adjust power command according to DTIM period and power level*/
 177 static int iwl_update_power_cmd(struct iwl_priv *priv,
 178                                 struct iwl_powertable_cmd *cmd, u16 mode)
 179 {
 180         struct iwl_power_vec_entry *range;
 181         struct iwl_power_mgr *pow_data;
 182         int i;
 183         u32 max_sleep = 0;
 184         u8 period;
 185         bool skip;
 186
 187         if (mode > IWL_POWER_INDEX_5) {
 188                 IWL_DEBUG_POWER(priv, "Error invalid power mode \n");
 189                 return -EINVAL;
 190         }
 191
 192         pow_data = &priv->power_data;
 193
 194         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
 195                 range = &pow_data->pwr_range_0[0];
 196         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
 197                 range = &pow_data->pwr_range_1[0];
 198         else
 199                 range = &pow_data->pwr_range_2[0];
 200
 201         period = pow_data->dtim_period;
 202         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
 203
 204         if (period == 0) {
 205                 period = 1;
 206                 skip = false;
 207         } else {
 208                 skip = !!range[mode].no_dtim;
 209         }
 210
 211         if (skip) {
 212                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
 213                 max_sleep = le32_to_cpu(slp_itrvl);
 214                 if (max_sleep == 0xFF)
 215                         max_sleep = period * (skip + 1);
 216                 else if (max_sleep >  period)
 217                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
 218                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 219         } else {
 220                 max_sleep = period;
 221                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 222         }
 223
 224         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 225                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
 226                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
 227
 228         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 229         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 230         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 231         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 232                         le32_to_cpu(cmd->sleep_interval[0]),
 233                         le32_to_cpu(cmd->sleep_interval[1]),
 234                         le32_to_cpu(cmd->sleep_interval[2]),
 235                         le32_to_cpu(cmd->sleep_interval[3]),
 236                         le32_to_cpu(cmd->sleep_interval[4]));
 237
 238         return 0;
 239 }
 240
 241
 242 /*
 243  * compute the final power mode index
 244  */
 245 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 246 {
 247         struct iwl_power_mgr *setting = &(priv->power_data);
 248         int ret = 0;
 249         u16 uninitialized_var(final_mode);
 250         bool update_chains;
 251
 252         /* Don't update the RX chain when chain noise calibration is running */
 253         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 254                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 255
 256         /* If on battery, set to 3,
 257          * if plugged into AC power, set to CAM ("continuously aware mode"),
 258          * else user level */
 259
 260         switch (setting->system_power_setting) {
 261         case IWL_POWER_SYS_AUTO:
 262                 final_mode = iwl_get_auto_power_mode(priv);
 263                 break;
 264         case IWL_POWER_SYS_BATTERY:
 265                 final_mode = IWL_POWER_INDEX_3;
 266                 break;
 267         case IWL_POWER_SYS_AC:
 268                 final_mode = IWL_POWER_MODE_CAM;
 269                 break;
 270         default:
 271                 final_mode = IWL_POWER_INDEX_3;
 272                 WARN_ON(1);
 273         }
 274
 275         if (setting->critical_power_setting > final_mode)
 276                 final_mode = setting->critical_power_setting;
 277
 278         /* driver only support CAM for non STA network */
 279         if (priv->iw_mode != NL80211_IFTYPE_STATION)
 280                 final_mode = IWL_POWER_MODE_CAM;
 281
 282         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
 283             ((setting->power_mode != final_mode) || force)) {
 284                 struct iwl_powertable_cmd cmd;
 285
 286                 if (final_mode != IWL_POWER_MODE_CAM)
 287                         set_bit(STATUS_POWER_PMI, &priv->status);
 288
 289                 iwl_update_power_cmd(priv, &cmd, final_mode);
 290                 cmd.keep_alive_beacons = 0;
 291
 292                 if (final_mode == IWL_POWER_INDEX_5)
 293                         cmd.flags |= IWL_POWER_FAST_PD;
 294
 295                 ret = iwl_set_power(priv, &cmd);
 296
 297                 if (final_mode == IWL_POWER_MODE_CAM)
 298                         clear_bit(STATUS_POWER_PMI, &priv->status);
 299                 else
 300                         set_bit(STATUS_POWER_PMI, &priv->status);
 301
 302                 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
 303                         priv->cfg->ops->lib->update_chain_flags(priv);
 304                 else
 305                         IWL_DEBUG_POWER(priv, "Cannot update the power, chain noise "
 306                                         "calibration running: %d\n",
 307                                         priv->chain_noise_data.state);
 308                 if (!ret)
 309                         setting->power_mode = final_mode;
 310         }
 311
 312         return ret;
 313 }
 314 EXPORT_SYMBOL(iwl_power_update_mode);
 315
 316 /* Allow other iwl code to disable/enable power management active
 317  * this will be useful for rate scale to disable PM during heavy
 318  * Tx/Rx activities
 319  */
 320 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
 321 {
 322         u16 prev_mode;
 323         int ret = 0;
 324
 325         if (priv->power_data.power_disabled)
 326                 return -EBUSY;
 327
 328         prev_mode = priv->power_data.user_power_setting;
 329         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
 330         ret = iwl_power_update_mode(priv, 0);
 331         priv->power_data.power_disabled = 1;
 332         priv->power_data.user_power_setting = prev_mode;
 333         cancel_delayed_work(&priv->set_power_save);
 334         if (ms)
 335                 queue_delayed_work(priv->workqueue, &priv->set_power_save,
 336                                    msecs_to_jiffies(ms));
 337
 338
 339         return ret;
 340 }
 341 EXPORT_SYMBOL(iwl_power_disable_management);
 342
 343 /* Allow other iwl code to disable/enable power management active
 344  * this will be useful for rate scale to disable PM during high
 345  * volume activities
 346  */
 347 int iwl_power_enable_management(struct iwl_priv *priv)
 348 {
 349         int ret = 0;
 350
 351         priv->power_data.power_disabled = 0;
 352         ret = iwl_power_update_mode(priv, 0);
 353         return ret;
 354 }
 355 EXPORT_SYMBOL(iwl_power_enable_management);
 356
 357 /* set user_power_setting */
 358 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
 359 {
 360         if (mode > IWL_POWER_LIMIT)
 361                 return -EINVAL;
 362
 363         priv->power_data.user_power_setting = mode;
 364
 365         return iwl_power_update_mode(priv, 0);
 366 }
 367 EXPORT_SYMBOL(iwl_power_set_user_mode);
 368
 369 /* set system_power_setting. This should be set by over all
 370  * PM application.
 371  */
 372 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
 373 {
 374         if (mode > IWL_POWER_LIMIT)
 375                 return -EINVAL;
 376
 377         priv->power_data.system_power_setting = mode;
 378
 379         return iwl_power_update_mode(priv, 0);
 380 }
 381 EXPORT_SYMBOL(iwl_power_set_system_mode);
 382
 383 /* initialize to default */
 384 void iwl_power_initialize(struct iwl_priv *priv)
 385 {
 386         iwl_power_init_handle(priv);
 387         priv->power_data.user_power_setting = IWL_POWER_AUTO;
 388         priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
 389         priv->power_data.power_disabled = 0;
 390         priv->power_data.is_battery_active = 0;
 391         priv->power_data.critical_power_setting = 0;
 392 }
 393 EXPORT_SYMBOL(iwl_power_initialize);
 394
 395 /* set critical_power_setting according to temperature value */
 396 int iwl_power_temperature_change(struct iwl_priv *priv)
 397 {
 398         int ret = 0;
 399         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
 400         u16 new_critical = priv->power_data.critical_power_setting;
 401
 402         if (temperature > IWL_CT_KILL_TEMPERATURE)
 403                 return 0;
 404         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
 405                 new_critical = IWL_POWER_INDEX_5;
 406         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
 407                 new_critical = IWL_POWER_INDEX_3;
 408         else
 409                 new_critical = IWL_POWER_MODE_CAM;
 410
 411         if (new_critical != priv->power_data.critical_power_setting)
 412                 priv->power_data.critical_power_setting = new_critical;
 413
 414         if (priv->power_data.critical_power_setting >
 415                                 priv->power_data.power_mode)
 416                 ret = iwl_power_update_mode(priv, 0);
 417
 418         return ret;
 419 }
 420 EXPORT_SYMBOL(iwl_power_temperature_change);
 421
 422 static void iwl_bg_set_power_save(struct work_struct *work)
 423 {
 424         struct iwl_priv *priv = container_of(work,
 425                                 struct iwl_priv, set_power_save.work);
 426         IWL_DEBUG_POWER(priv, "update power\n");
 427
 428         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 429                 return;
 430
 431         mutex_lock(&priv->mutex);
 432
 433         /* on starting association we disable power management
 434          * until association, if association failed then this
 435          * timer will expire and enable PM again.
 436          */
 437         if (!iwl_is_associated(priv))
 438                 iwl_power_enable_management(priv);
 439
 440         mutex_unlock(&priv->mutex);
 441 }
 442 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
 443 {
 444         INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
 445 }
 446 EXPORT_SYMBOL(iwl_setup_power_deferred_work);
 447
 448 void iwl_power_cancel_timeout(struct iwl_priv *priv)
 449 {
 450         cancel_delayed_work(&priv->set_power_save);
 451 }
 452 EXPORT_SYMBOL(iwl_power_cancel_timeout);