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