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/version.h>
  33 #include <linux/init.h>
  34
  35 #include <net/mac80211.h>
  36
  37 #include "iwl-eeprom.h"
  38 #include "iwl-dev.h"
  39 #include "iwl-core.h"
  40 #include "iwl-commands.h"
  41 #include "iwl-debug.h"
  42 #include "iwl-power.h"
  43 #include "iwl-helpers.h"
  44
  45 /*
  46  * Setting power level allow the card to go to sleep when not busy
  47  * there are three factor that decide the power level to go to, they
  48  * are list here with its priority
  49  *  1- critical_power_setting this will be set according to card temperature.
  50  *  2- system_power_setting this will be set by system PM manager.
  51  *  3- user_power_setting this will be set by user either by writing to sys or
  52  *      mac80211
  53  *
  54  * if system_power_setting and user_power_setting is set to auto
  55  * the power level will be decided according to association status and battery
  56  * status.
  57  *
  58  */
  59
  60 #define MSEC_TO_USEC 1024
  61 #define IWL_POWER_RANGE_0_MAX  (2)
  62 #define IWL_POWER_RANGE_1_MAX  (10)
  63
  64
  65 #define NOSLP __constant_cpu_to_le16(0), 0, 0
  66 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  67 #define SLP_TOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
  68 #define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
  69                                      __constant_cpu_to_le32(X1), \
  70                                      __constant_cpu_to_le32(X2), \
  71                                      __constant_cpu_to_le32(X3), \
  72                                      __constant_cpu_to_le32(X4)}
  73
  74 #define IWL_POWER_ON_BATTERY            IWL_POWER_INDEX_5
  75 #define IWL_POWER_ON_AC_DISASSOC        IWL_POWER_MODE_CAM
  76 #define IWL_POWER_ON_AC_ASSOC           IWL_POWER_MODE_CAM
  77
  78
  79 #define IWL_CT_KILL_TEMPERATURE         110
  80 #define IWL_MIN_POWER_TEMPERATURE       100
  81 #define IWL_REDUCED_POWER_TEMPERATURE   95
  82
  83 /* default power management (not Tx power) table values */
  84 /* for tim  0-10 */
  85 static struct iwl_power_vec_entry range_0[IWL_POWER_AC] = {
  86         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
  87         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  88         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  89         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  90         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  91         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  92 };
  93
  94
  95 /* for tim = 3-10 */
  96 static struct iwl_power_vec_entry range_1[IWL_POWER_AC] = {
  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, 4)}, 0},
  99         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
 100         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
 101         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
 102         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
 103 };
 104
 105 /* for tim > 11 */
 106 static struct iwl_power_vec_entry range_2[IWL_POWER_AC] = {
 107         {{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
 108         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 109         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 110         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 111         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 112         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 113 };
 114
 115 /* decide the right power level according to association status
 116  * and battery status
 117  */
 118 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
 119 {
 120         u16 mode = priv->power_data.user_power_setting;
 121
 122         switch (priv->power_data.user_power_setting) {
 123         case IWL_POWER_AUTO:
 124                 /* if running on battery */
 125                 if (priv->power_data.is_battery_active)
 126                         mode = IWL_POWER_ON_BATTERY;
 127                 else if (iwl_is_associated(priv))
 128                         mode = IWL_POWER_ON_AC_ASSOC;
 129                 else
 130                         mode = IWL_POWER_ON_AC_DISASSOC;
 131                 break;
 132         case IWL_POWER_BATTERY:
 133                 mode = IWL_POWER_INDEX_3;
 134                 break;
 135         case IWL_POWER_AC:
 136                 mode = IWL_POWER_MODE_CAM;
 137                 break;
 138         }
 139         return mode;
 140 }
 141
 142 /* initialize to default */
 143 static int iwl_power_init_handle(struct iwl_priv *priv)
 144 {
 145         int ret = 0, i;
 146         struct iwl_power_mgr *pow_data;
 147         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_AC;
 148         u16 pci_pm;
 149
 150         IWL_DEBUG_POWER("Initialize power \n");
 151
 152         pow_data = &(priv->power_data);
 153
 154         memset(pow_data, 0, sizeof(*pow_data));
 155
 156         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
 157         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 158         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 159
 160         ret = pci_read_config_word(priv->pci_dev,
 161                                   PCI_LINK_CTRL, &pci_pm);
 162         if (ret != 0)
 163                 return 0;
 164         else {
 165                 struct iwl4965_powertable_cmd *cmd;
 166
 167                 IWL_DEBUG_POWER("adjust power command flags\n");
 168
 169                 for (i = 0; i < IWL_POWER_AC; i++) {
 170                         cmd = &pow_data->pwr_range_0[i].cmd;
 171
 172                         if (pci_pm & 0x1)
 173                                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 174                         else
 175                                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 176                 }
 177         }
 178         return ret;
 179 }
 180
 181 /* adjust power command according to dtim period and power level*/
 182 static int iwl_update_power_command(struct iwl_priv *priv,
 183                                     struct iwl4965_powertable_cmd *cmd,
 184                                     u16 mode)
 185 {
 186         int ret = 0, i;
 187         u8 skip;
 188         u32 max_sleep = 0;
 189         struct iwl_power_vec_entry *range;
 190         u8 period = 0;
 191         struct iwl_power_mgr *pow_data;
 192
 193         if (mode > IWL_POWER_INDEX_5) {
 194                 IWL_DEBUG_POWER("Error invalid power mode \n");
 195                 return -1;
 196         }
 197         pow_data = &(priv->power_data);
 198
 199         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
 200                 range = &pow_data->pwr_range_0[0];
 201         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
 202                 range = &pow_data->pwr_range_1[0];
 203         else
 204                 range = &pow_data->pwr_range_2[0];
 205
 206         period = pow_data->dtim_period;
 207         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl4965_powertable_cmd));
 208
 209         if (period == 0) {
 210                 period = 1;
 211                 skip = 0;
 212         } else
 213                 skip = range[mode].no_dtim;
 214
 215         if (skip == 0) {
 216                 max_sleep = period;
 217                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 218         } else {
 219                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
 220                 max_sleep = le32_to_cpu(slp_itrvl);
 221                 if (max_sleep == 0xFF)
 222                         max_sleep = period * (skip + 1);
 223                 else if (max_sleep >  period)
 224                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
 225                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 226         }
 227
 228         for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
 229                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
 230                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
 231         }
 232
 233         IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
 234         IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 235         IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 236         IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 237                         le32_to_cpu(cmd->sleep_interval[0]),
 238                         le32_to_cpu(cmd->sleep_interval[1]),
 239                         le32_to_cpu(cmd->sleep_interval[2]),
 240                         le32_to_cpu(cmd->sleep_interval[3]),
 241                         le32_to_cpu(cmd->sleep_interval[4]));
 242
 243         return ret;
 244 }
 245
 246
 247 /*
 248  * calucaute the final power mode index
 249  */
 250 int iwl_power_update_mode(struct iwl_priv *priv, u8 refresh)
 251 {
 252         struct iwl_power_mgr *setting = &(priv->power_data);
 253         int ret = 0;
 254         u16 uninitialized_var(final_mode);
 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_AUTO:
 262                 final_mode = iwl_get_auto_power_mode(priv);
 263                 break;
 264         case IWL_POWER_BATTERY:
 265                 final_mode = IWL_POWER_INDEX_3;
 266                 break;
 267         case IWL_POWER_AC:
 268                 final_mode = IWL_POWER_MODE_CAM;
 269                 break;
 270         default:
 271                 final_mode = setting->system_power_setting;
 272         }
 273
 274         if (setting->critical_power_setting > final_mode)
 275                 final_mode = setting->critical_power_setting;
 276
 277         /* driver only support CAM for non STA network */
 278         if (priv->iw_mode != IEEE80211_IF_TYPE_STA)
 279                 final_mode = IWL_POWER_MODE_CAM;
 280
 281         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
 282             ((setting->power_mode != final_mode) || refresh)) {
 283                 struct iwl4965_powertable_cmd cmd;
 284
 285                 if (final_mode != IWL_POWER_MODE_CAM)
 286                         set_bit(STATUS_POWER_PMI, &priv->status);
 287
 288                 iwl_update_power_command(priv, &cmd, final_mode);
 289                 cmd.keep_alive_beacons = 0;
 290
 291                 if (final_mode == IWL_POWER_INDEX_5)
 292                         cmd.flags |= IWL_POWER_FAST_PD;
 293
 294                 if (priv->cfg->ops->lib->set_power)
 295                         ret = priv->cfg->ops->lib->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)
 303                         priv->cfg->ops->lib->update_chain_flags(priv);
 304
 305                 if (!ret)
 306                         setting->power_mode = final_mode;
 307         }
 308
 309         return ret;
 310 }
 311 EXPORT_SYMBOL(iwl_power_update_mode);
 312
 313 /* Allow other iwl code to disable/enable power management active
 314  * this will be usefull for rate scale to disable PM during heavy
 315  * Tx/Rx activities
 316  */
 317 int iwl_power_disable_management(struct iwl_priv *priv)
 318 {
 319         u16 prev_mode;
 320         int ret = 0;
 321
 322         if (priv->power_data.power_disabled)
 323                 return -EBUSY;
 324
 325         prev_mode = priv->power_data.user_power_setting;
 326         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
 327         ret = iwl_power_update_mode(priv, 0);
 328         priv->power_data.power_disabled = 1;
 329         priv->power_data.user_power_setting = prev_mode;
 330
 331         return ret;
 332 }
 333 EXPORT_SYMBOL(iwl_power_disable_management);
 334
 335 /* Allow other iwl code to disable/enable power management active
 336  * this will be usefull for rate scale to disable PM during hight
 337  * valume activities
 338  */
 339 int iwl_power_enable_management(struct iwl_priv *priv)
 340 {
 341         int ret = 0;
 342
 343         priv->power_data.power_disabled = 0;
 344         ret = iwl_power_update_mode(priv, 0);
 345         return ret;
 346 }
 347 EXPORT_SYMBOL(iwl_power_enable_management);
 348
 349 /* set user_power_setting */
 350 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
 351 {
 352         int ret = 0;
 353
 354         if (mode > IWL_POWER_LIMIT)
 355                 return -EINVAL;
 356
 357         priv->power_data.user_power_setting = mode;
 358
 359         ret = iwl_power_update_mode(priv, 0);
 360
 361         return ret;
 362 }
 363 EXPORT_SYMBOL(iwl_power_set_user_mode);
 364
 365
 366 /* set system_power_setting. This should be set by over all
 367  * PM application.
 368  */
 369 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
 370 {
 371         int ret = 0;
 372
 373         if (mode > IWL_POWER_LIMIT)
 374                 return -EINVAL;
 375
 376         priv->power_data.system_power_setting = mode;
 377
 378         ret = iwl_power_update_mode(priv, 0);
 379
 380         return ret;
 381 }
 382 EXPORT_SYMBOL(iwl_power_set_system_mode);
 383
 384 /* initilize to default */
 385 void iwl_power_initialize(struct iwl_priv *priv)
 386 {
 387
 388         iwl_power_init_handle(priv);
 389         priv->power_data.user_power_setting = IWL_POWER_AUTO;
 390         priv->power_data.power_disabled = 0;
 391         priv->power_data.system_power_setting = IWL_POWER_AUTO;
 392         priv->power_data.is_battery_active = 0;
 393         priv->power_data.power_disabled = 0;
 394         priv->power_data.critical_power_setting = 0;
 395 }
 396 EXPORT_SYMBOL(iwl_power_initialize);
 397
 398 /* set critical_power_setting according to temperature value */
 399 int iwl_power_temperature_change(struct iwl_priv *priv)
 400 {
 401         int ret = 0;
 402         u16 new_critical = priv->power_data.critical_power_setting;
 403         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
 404
 405         if (temperature > IWL_CT_KILL_TEMPERATURE)
 406                 return 0;
 407         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
 408                 new_critical = IWL_POWER_INDEX_5;
 409         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
 410                 new_critical = IWL_POWER_INDEX_3;
 411         else
 412                 new_critical = IWL_POWER_MODE_CAM;
 413
 414         if (new_critical != priv->power_data.critical_power_setting)
 415                 priv->power_data.critical_power_setting = new_critical;
 416
 417         if (priv->power_data.critical_power_setting >
 418                                 priv->power_data.power_mode)
 419                 ret = iwl_power_update_mode(priv, 0);
 420
 421         return ret;
 422 }
 423 EXPORT_SYMBOL(iwl_power_temperature_change);