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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2008 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  * James P. Ketrenos <ipw2100-admin@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 #include "iwl-helpers.h"
  43
  44 /*
  45  * Setting power level allow the card to go to sleep when not busy
  46  * there are three factor that decide the power level to go to, they
  47  * are list here with its priority
  48  *  1- critical_power_setting this will be set according to card temperature.
  49  *  2- system_power_setting this will be set by system PM manager.
  50  *  3- user_power_setting this will be set by user either by writing to sys or
  51  *      mac80211
  52  *
  53  * if system_power_setting and user_power_setting is set to auto
  54  * the power level will be decided according to association status and battery
  55  * status.
  56  *
  57  */
  58
  59 #define MSEC_TO_USEC 1024
  60 #define IWL_POWER_RANGE_0_MAX  (2)
  61 #define IWL_POWER_RANGE_1_MAX  (10)
  62
  63
  64 #define NOSLP __constant_cpu_to_le16(0), 0, 0
  65 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  66 #define SLP_TOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
  67 #define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
  68                                      __constant_cpu_to_le32(X1), \
  69                                      __constant_cpu_to_le32(X2), \
  70                                      __constant_cpu_to_le32(X3), \
  71                                      __constant_cpu_to_le32(X4)}
  72
  73 #define IWL_POWER_ON_BATTERY            IWL_POWER_INDEX_5
  74 #define IWL_POWER_ON_AC_DISASSOC        IWL_POWER_MODE_CAM
  75 #define IWL_POWER_ON_AC_ASSOC           IWL_POWER_MODE_CAM
  76
  77
  78 #define IWL_CT_KILL_TEMPERATURE         110
  79 #define IWL_MIN_POWER_TEMPERATURE       100
  80 #define IWL_REDUCED_POWER_TEMPERATURE   95
  81
  82 /* default power management (not Tx power) table values */
  83 /* for TIM  0-10 */
  84 static struct iwl_power_vec_entry range_0[IWL_POWER_MAX] = {
  85         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
  86         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  87         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  88         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  89         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  90         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  91 };
  92
  93
  94 /* for TIM = 3-10 */
  95 static struct iwl_power_vec_entry range_1[IWL_POWER_MAX] = {
  96         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
  97         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
  98         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
  99         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
 100         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
 101         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
 102 };
 103
 104 /* for TIM > 11 */
 105 static struct iwl_power_vec_entry range_2[IWL_POWER_MAX] = {
 106         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
 107         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 108         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 109         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 110         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 111         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 112 };
 113
 114 /* set card power command */
 115 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
 116 {
 117         return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
 118                                       sizeof(struct iwl_powertable_cmd),
 119                                       cmd, NULL);
 120 }
 121 /* decide the right power level according to association status
 122  * and battery status
 123  */
 124 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
 125 {
 126         u16 mode;
 127
 128         switch (priv->power_data.user_power_setting) {
 129         case IWL_POWER_AUTO:
 130                 /* if running on battery */
 131                 if (priv->power_data.is_battery_active)
 132                         mode = IWL_POWER_ON_BATTERY;
 133                 else if (iwl_is_associated(priv))
 134                         mode = IWL_POWER_ON_AC_ASSOC;
 135                 else
 136                         mode = IWL_POWER_ON_AC_DISASSOC;
 137                 break;
 138         /* FIXME: remove battery and ac from here */
 139         case IWL_POWER_BATTERY:
 140                 mode = IWL_POWER_INDEX_3;
 141                 break;
 142         case IWL_POWER_AC:
 143                 mode = IWL_POWER_MODE_CAM;
 144                 break;
 145         default:
 146                 mode = priv->power_data.user_power_setting;
 147                 break;
 148         }
 149         return mode;
 150 }
 151
 152 /* initialize to default */
 153 static int iwl_power_init_handle(struct iwl_priv *priv)
 154 {
 155         struct iwl_power_mgr *pow_data;
 156         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_MAX;
 157         struct iwl_powertable_cmd *cmd;
 158         int i;
 159         u16 pci_pm;
 160
 161         IWL_DEBUG_POWER("Initialize power \n");
 162
 163         pow_data = &(priv->power_data);
 164
 165         memset(pow_data, 0, sizeof(*pow_data));
 166
 167         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
 168         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 169         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 170
 171         pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &pci_pm);
 172
 173         IWL_DEBUG_POWER("adjust power command flags\n");
 174
 175         for (i = 0; i < IWL_POWER_MAX; i++) {
 176                 cmd = &pow_data->pwr_range_0[i].cmd;
 177
 178                 if (pci_pm & PCI_CFG_LINK_CTRL_VAL_L0S_EN)
 179                         cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 180                 else
 181                         cmd->flags |= IWL_POWER_PCI_PM_MSK;
 182         }
 183         return 0;
 184 }
 185
 186 /* adjust power command according to DTIM period and power level*/
 187 static int iwl_update_power_command(struct iwl_priv *priv,
 188                                     struct iwl_powertable_cmd *cmd,
 189                                     u16 mode)
 190 {
 191         int ret = 0, i;
 192         u8 skip;
 193         u32 max_sleep = 0;
 194         struct iwl_power_vec_entry *range;
 195         u8 period = 0;
 196         struct iwl_power_mgr *pow_data;
 197
 198         if (mode > IWL_POWER_INDEX_5) {
 199                 IWL_DEBUG_POWER("Error invalid power mode \n");
 200                 return -1;
 201         }
 202         pow_data = &(priv->power_data);
 203
 204         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
 205                 range = &pow_data->pwr_range_0[0];
 206         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
 207                 range = &pow_data->pwr_range_1[0];
 208         else
 209                 range = &pow_data->pwr_range_2[0];
 210
 211         period = pow_data->dtim_period;
 212         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
 213
 214         if (period == 0) {
 215                 period = 1;
 216                 skip = 0;
 217         } else
 218                 skip = range[mode].no_dtim;
 219
 220         if (skip == 0) {
 221                 max_sleep = period;
 222                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 223         } else {
 224                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
 225                 max_sleep = le32_to_cpu(slp_itrvl);
 226                 if (max_sleep == 0xFF)
 227                         max_sleep = period * (skip + 1);
 228                 else if (max_sleep >  period)
 229                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
 230                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 231         }
 232
 233         for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
 234                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
 235                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
 236         }
 237
 238         IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
 239         IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 240         IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 241         IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 242                         le32_to_cpu(cmd->sleep_interval[0]),
 243                         le32_to_cpu(cmd->sleep_interval[1]),
 244                         le32_to_cpu(cmd->sleep_interval[2]),
 245                         le32_to_cpu(cmd->sleep_interval[3]),
 246                         le32_to_cpu(cmd->sleep_interval[4]));
 247
 248         return ret;
 249 }
 250
 251
 252 /*
 253  * compute the final power mode index
 254  */
 255 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 256 {
 257         struct iwl_power_mgr *setting = &(priv->power_data);
 258         int ret = 0;
 259         u16 uninitialized_var(final_mode);
 260         bool update_chains;
 261
 262         /* Don't update the RX chain when chain noise calibration is running */
 263         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 264                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 265
 266         /* If on battery, set to 3,
 267          * if plugged into AC power, set to CAM ("continuously aware mode"),
 268          * else user level */
 269
 270         switch (setting->system_power_setting) {
 271         case IWL_POWER_SYS_AUTO:
 272                 final_mode = iwl_get_auto_power_mode(priv);
 273                 break;
 274         case IWL_POWER_SYS_BATTERY:
 275                 final_mode = IWL_POWER_INDEX_3;
 276                 break;
 277         case IWL_POWER_SYS_AC:
 278                 final_mode = IWL_POWER_MODE_CAM;
 279                 break;
 280         default:
 281                 final_mode = IWL_POWER_INDEX_3;
 282                 WARN_ON(1);
 283         }
 284
 285         if (setting->critical_power_setting > final_mode)
 286                 final_mode = setting->critical_power_setting;
 287
 288         /* driver only support CAM for non STA network */
 289         if (priv->iw_mode != NL80211_IFTYPE_STATION)
 290                 final_mode = IWL_POWER_MODE_CAM;
 291
 292         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
 293             ((setting->power_mode != final_mode) || force)) {
 294                 struct iwl_powertable_cmd cmd;
 295
 296                 if (final_mode != IWL_POWER_MODE_CAM)
 297                         set_bit(STATUS_POWER_PMI, &priv->status);
 298
 299                 iwl_update_power_command(priv, &cmd, final_mode);
 300                 cmd.keep_alive_beacons = 0;
 301
 302                 if (final_mode == IWL_POWER_INDEX_5)
 303                         cmd.flags |= IWL_POWER_FAST_PD;
 304
 305                 ret = iwl_set_power(priv, &cmd);
 306
 307                 if (final_mode == IWL_POWER_MODE_CAM)
 308                         clear_bit(STATUS_POWER_PMI, &priv->status);
 309                 else
 310                         set_bit(STATUS_POWER_PMI, &priv->status);
 311
 312                 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
 313                         priv->cfg->ops->lib->update_chain_flags(priv);
 314                 else
 315                         IWL_DEBUG_POWER("Cannot update the power, chain noise "
 316                                         "calibration running: %d\n",
 317                                         priv->chain_noise_data.state);
 318                 if (!ret)
 319                         setting->power_mode = final_mode;
 320         }
 321
 322         return ret;
 323 }
 324 EXPORT_SYMBOL(iwl_power_update_mode);
 325
 326 /* Allow other iwl code to disable/enable power management active
 327  * this will be useful for rate scale to disable PM during heavy
 328  * Tx/Rx activities
 329  */
 330 int iwl_power_disable_management(struct iwl_priv *priv, u32 ms)
 331 {
 332         u16 prev_mode;
 333         int ret = 0;
 334
 335         if (priv->power_data.power_disabled)
 336                 return -EBUSY;
 337
 338         prev_mode = priv->power_data.user_power_setting;
 339         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
 340         ret = iwl_power_update_mode(priv, 0);
 341         priv->power_data.power_disabled = 1;
 342         priv->power_data.user_power_setting = prev_mode;
 343         cancel_delayed_work(&priv->set_power_save);
 344         if (ms)
 345                 queue_delayed_work(priv->workqueue, &priv->set_power_save,
 346                                    msecs_to_jiffies(ms));
 347
 348
 349         return ret;
 350 }
 351 EXPORT_SYMBOL(iwl_power_disable_management);
 352
 353 /* Allow other iwl code to disable/enable power management active
 354  * this will be useful for rate scale to disable PM during high
 355  * volume activities
 356  */
 357 int iwl_power_enable_management(struct iwl_priv *priv)
 358 {
 359         int ret = 0;
 360
 361         priv->power_data.power_disabled = 0;
 362         ret = iwl_power_update_mode(priv, 0);
 363         return ret;
 364 }
 365 EXPORT_SYMBOL(iwl_power_enable_management);
 366
 367 /* set user_power_setting */
 368 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
 369 {
 370         if (mode > IWL_POWER_LIMIT)
 371                 return -EINVAL;
 372
 373         priv->power_data.user_power_setting = mode;
 374
 375         return iwl_power_update_mode(priv, 0);
 376 }
 377 EXPORT_SYMBOL(iwl_power_set_user_mode);
 378
 379 /* set system_power_setting. This should be set by over all
 380  * PM application.
 381  */
 382 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
 383 {
 384         if (mode > IWL_POWER_LIMIT)
 385                 return -EINVAL;
 386
 387         priv->power_data.system_power_setting = mode;
 388
 389         return iwl_power_update_mode(priv, 0);
 390 }
 391 EXPORT_SYMBOL(iwl_power_set_system_mode);
 392
 393 /* initialize to default */
 394 void iwl_power_initialize(struct iwl_priv *priv)
 395 {
 396
 397         iwl_power_init_handle(priv);
 398         priv->power_data.user_power_setting = IWL_POWER_AUTO;
 399         priv->power_data.power_disabled = 0;
 400         priv->power_data.system_power_setting = IWL_POWER_SYS_AUTO;
 401         priv->power_data.is_battery_active = 0;
 402         priv->power_data.power_disabled = 0;
 403         priv->power_data.critical_power_setting = 0;
 404 }
 405 EXPORT_SYMBOL(iwl_power_initialize);
 406
 407 /* set critical_power_setting according to temperature value */
 408 int iwl_power_temperature_change(struct iwl_priv *priv)
 409 {
 410         int ret = 0;
 411         u16 new_critical = priv->power_data.critical_power_setting;
 412         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
 413
 414         if (temperature > IWL_CT_KILL_TEMPERATURE)
 415                 return 0;
 416         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
 417                 new_critical = IWL_POWER_INDEX_5;
 418         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
 419                 new_critical = IWL_POWER_INDEX_3;
 420         else
 421                 new_critical = IWL_POWER_MODE_CAM;
 422
 423         if (new_critical != priv->power_data.critical_power_setting)
 424                 priv->power_data.critical_power_setting = new_critical;
 425
 426         if (priv->power_data.critical_power_setting >
 427                                 priv->power_data.power_mode)
 428                 ret = iwl_power_update_mode(priv, 0);
 429
 430         return ret;
 431 }
 432 EXPORT_SYMBOL(iwl_power_temperature_change);
 433
 434 static void iwl_bg_set_power_save(struct work_struct *work)
 435 {
 436         struct iwl_priv *priv = container_of(work,
 437                                 struct iwl_priv, set_power_save.work);
 438         IWL_DEBUG(IWL_DL_STATE, "update power\n");
 439
 440         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 441                 return;
 442
 443         mutex_lock(&priv->mutex);
 444
 445         /* on starting association we disable power management
 446          * until association, if association failed then this
 447          * timer will expire and enable PM again.
 448          */
 449         if (!iwl_is_associated(priv))
 450                 iwl_power_enable_management(priv);
 451
 452         mutex_unlock(&priv->mutex);
 453 }
 454 void iwl_setup_power_deferred_work(struct iwl_priv *priv)
 455 {
 456         INIT_DELAYED_WORK(&priv->set_power_save, iwl_bg_set_power_save);
 457 }
 458 EXPORT_SYMBOL(iwl_setup_power_deferred_work);
 459
 460 void iwl_power_cancel_timeout(struct iwl_priv *priv)
 461 {
 462         cancel_delayed_work(&priv->set_power_save);
 463 }
 464 EXPORT_SYMBOL(iwl_power_cancel_timeout);