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 /* set card power command */
 116 static int iwl_set_power(struct iwl_priv *priv, void *cmd)
 117 {
 118         return iwl_send_cmd_pdu_async(priv, POWER_TABLE_CMD,
 119                                       sizeof(struct iwl_powertable_cmd),
 120                                       cmd, NULL);
 121 }
 122 /* decide the right power level according to association status
 123  * and battery status
 124  */
 125 static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
 126 {
 127         u16 mode = priv->power_data.user_power_setting;
 128
 129         switch (priv->power_data.user_power_setting) {
 130         case IWL_POWER_AUTO:
 131                 /* if running on battery */
 132                 if (priv->power_data.is_battery_active)
 133                         mode = IWL_POWER_ON_BATTERY;
 134                 else if (iwl_is_associated(priv))
 135                         mode = IWL_POWER_ON_AC_ASSOC;
 136                 else
 137                         mode = IWL_POWER_ON_AC_DISASSOC;
 138                 break;
 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         }
 146         return mode;
 147 }
 148
 149 /* initialize to default */
 150 static int iwl_power_init_handle(struct iwl_priv *priv)
 151 {
 152         int ret = 0, i;
 153         struct iwl_power_mgr *pow_data;
 154         int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_AC;
 155         u16 pci_pm;
 156
 157         IWL_DEBUG_POWER("Initialize power \n");
 158
 159         pow_data = &(priv->power_data);
 160
 161         memset(pow_data, 0, sizeof(*pow_data));
 162
 163         memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
 164         memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
 165         memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
 166
 167         ret = pci_read_config_word(priv->pci_dev,
 168                                   PCI_LINK_CTRL, &pci_pm);
 169         if (ret != 0)
 170                 return 0;
 171         else {
 172                 struct iwl_powertable_cmd *cmd;
 173
 174                 IWL_DEBUG_POWER("adjust power command flags\n");
 175
 176                 for (i = 0; i < IWL_POWER_AC; i++) {
 177                         cmd = &pow_data->pwr_range_0[i].cmd;
 178
 179                         if (pci_pm & 0x1)
 180                                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 181                         else
 182                                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 183                 }
 184         }
 185         return ret;
 186 }
 187
 188 /* adjust power command according to dtim period and power level*/
 189 static int iwl_update_power_command(struct iwl_priv *priv,
 190                                     struct iwl_powertable_cmd *cmd,
 191                                     u16 mode)
 192 {
 193         int ret = 0, i;
 194         u8 skip;
 195         u32 max_sleep = 0;
 196         struct iwl_power_vec_entry *range;
 197         u8 period = 0;
 198         struct iwl_power_mgr *pow_data;
 199
 200         if (mode > IWL_POWER_INDEX_5) {
 201                 IWL_DEBUG_POWER("Error invalid power mode \n");
 202                 return -1;
 203         }
 204         pow_data = &(priv->power_data);
 205
 206         if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
 207                 range = &pow_data->pwr_range_0[0];
 208         else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
 209                 range = &pow_data->pwr_range_1[0];
 210         else
 211                 range = &pow_data->pwr_range_2[0];
 212
 213         period = pow_data->dtim_period;
 214         memcpy(cmd, &range[mode].cmd, sizeof(struct iwl_powertable_cmd));
 215
 216         if (period == 0) {
 217                 period = 1;
 218                 skip = 0;
 219         } else
 220                 skip = range[mode].no_dtim;
 221
 222         if (skip == 0) {
 223                 max_sleep = period;
 224                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 225         } else {
 226                 __le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
 227                 max_sleep = le32_to_cpu(slp_itrvl);
 228                 if (max_sleep == 0xFF)
 229                         max_sleep = period * (skip + 1);
 230                 else if (max_sleep >  period)
 231                         max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
 232                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 233         }
 234
 235         for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
 236                 if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
 237                         cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
 238         }
 239
 240         IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
 241         IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 242         IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 243         IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 244                         le32_to_cpu(cmd->sleep_interval[0]),
 245                         le32_to_cpu(cmd->sleep_interval[1]),
 246                         le32_to_cpu(cmd->sleep_interval[2]),
 247                         le32_to_cpu(cmd->sleep_interval[3]),
 248                         le32_to_cpu(cmd->sleep_interval[4]));
 249
 250         return ret;
 251 }
 252
 253
 254 /*
 255  * calucaute the final power mode index
 256  */
 257 int iwl_power_update_mode(struct iwl_priv *priv, u8 refresh)
 258 {
 259         struct iwl_power_mgr *setting = &(priv->power_data);
 260         int ret = 0;
 261         u16 uninitialized_var(final_mode);
 262
 263        /* If on battery, set to 3,
 264         * if plugged into AC power, set to CAM ("continuously aware mode"),
 265         * else user level */
 266
 267         switch (setting->system_power_setting) {
 268         case IWL_POWER_AUTO:
 269                 final_mode = iwl_get_auto_power_mode(priv);
 270                 break;
 271         case IWL_POWER_BATTERY:
 272                 final_mode = IWL_POWER_INDEX_3;
 273                 break;
 274         case IWL_POWER_AC:
 275                 final_mode = IWL_POWER_MODE_CAM;
 276                 break;
 277         default:
 278                 final_mode = setting->system_power_setting;
 279         }
 280
 281         if (setting->critical_power_setting > final_mode)
 282                 final_mode = setting->critical_power_setting;
 283
 284         /* driver only support CAM for non STA network */
 285         if (priv->iw_mode != IEEE80211_IF_TYPE_STA)
 286                 final_mode = IWL_POWER_MODE_CAM;
 287
 288         if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
 289             ((setting->power_mode != final_mode) || refresh)) {
 290                 struct iwl_powertable_cmd cmd;
 291
 292                 if (final_mode != IWL_POWER_MODE_CAM)
 293                         set_bit(STATUS_POWER_PMI, &priv->status);
 294
 295                 iwl_update_power_command(priv, &cmd, final_mode);
 296                 cmd.keep_alive_beacons = 0;
 297
 298                 if (final_mode == IWL_POWER_INDEX_5)
 299                         cmd.flags |= IWL_POWER_FAST_PD;
 300
 301                 ret = iwl_set_power(priv, &cmd);
 302
 303                 if (final_mode == IWL_POWER_MODE_CAM)
 304                         clear_bit(STATUS_POWER_PMI, &priv->status);
 305                 else
 306                         set_bit(STATUS_POWER_PMI, &priv->status);
 307
 308                 if (priv->cfg->ops->lib->update_chain_flags)
 309                         priv->cfg->ops->lib->update_chain_flags(priv);
 310
 311                 if (!ret)
 312                         setting->power_mode = final_mode;
 313         }
 314
 315         return ret;
 316 }
 317 EXPORT_SYMBOL(iwl_power_update_mode);
 318
 319 /* Allow other iwl code to disable/enable power management active
 320  * this will be usefull for rate scale to disable PM during heavy
 321  * Tx/Rx activities
 322  */
 323 int iwl_power_disable_management(struct iwl_priv *priv)
 324 {
 325         u16 prev_mode;
 326         int ret = 0;
 327
 328         if (priv->power_data.power_disabled)
 329                 return -EBUSY;
 330
 331         prev_mode = priv->power_data.user_power_setting;
 332         priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
 333         ret = iwl_power_update_mode(priv, 0);
 334         priv->power_data.power_disabled = 1;
 335         priv->power_data.user_power_setting = prev_mode;
 336
 337         return ret;
 338 }
 339 EXPORT_SYMBOL(iwl_power_disable_management);
 340
 341 /* Allow other iwl code to disable/enable power management active
 342  * this will be usefull for rate scale to disable PM during hight
 343  * valume activities
 344  */
 345 int iwl_power_enable_management(struct iwl_priv *priv)
 346 {
 347         int ret = 0;
 348
 349         priv->power_data.power_disabled = 0;
 350         ret = iwl_power_update_mode(priv, 0);
 351         return ret;
 352 }
 353 EXPORT_SYMBOL(iwl_power_enable_management);
 354
 355 /* set user_power_setting */
 356 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
 357 {
 358         int ret = 0;
 359
 360         if (mode > IWL_POWER_LIMIT)
 361                 return -EINVAL;
 362
 363         priv->power_data.user_power_setting = mode;
 364
 365         ret = iwl_power_update_mode(priv, 0);
 366
 367         return ret;
 368 }
 369 EXPORT_SYMBOL(iwl_power_set_user_mode);
 370
 371
 372 /* set system_power_setting. This should be set by over all
 373  * PM application.
 374  */
 375 int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
 376 {
 377         int ret = 0;
 378
 379         if (mode > IWL_POWER_LIMIT)
 380                 return -EINVAL;
 381
 382         priv->power_data.system_power_setting = mode;
 383
 384         ret = iwl_power_update_mode(priv, 0);
 385
 386         return ret;
 387 }
 388 EXPORT_SYMBOL(iwl_power_set_system_mode);
 389
 390 /* initilize to default */
 391 void iwl_power_initialize(struct iwl_priv *priv)
 392 {
 393
 394         iwl_power_init_handle(priv);
 395         priv->power_data.user_power_setting = IWL_POWER_AUTO;
 396         priv->power_data.power_disabled = 0;
 397         priv->power_data.system_power_setting = IWL_POWER_AUTO;
 398         priv->power_data.is_battery_active = 0;
 399         priv->power_data.power_disabled = 0;
 400         priv->power_data.critical_power_setting = 0;
 401 }
 402 EXPORT_SYMBOL(iwl_power_initialize);
 403
 404 /* set critical_power_setting according to temperature value */
 405 int iwl_power_temperature_change(struct iwl_priv *priv)
 406 {
 407         int ret = 0;
 408         u16 new_critical = priv->power_data.critical_power_setting;
 409         s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
 410
 411         if (temperature > IWL_CT_KILL_TEMPERATURE)
 412                 return 0;
 413         else if (temperature > IWL_MIN_POWER_TEMPERATURE)
 414                 new_critical = IWL_POWER_INDEX_5;
 415         else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
 416                 new_critical = IWL_POWER_INDEX_3;
 417         else
 418                 new_critical = IWL_POWER_MODE_CAM;
 419
 420         if (new_critical != priv->power_data.critical_power_setting)
 421                 priv->power_data.critical_power_setting = new_critical;
 422
 423         if (priv->power_data.critical_power_setting >
 424                                 priv->power_data.power_mode)
 425                 ret = iwl_power_update_mode(priv, 0);
 426
 427         return ret;
 428 }
 429 EXPORT_SYMBOL(iwl_power_temperature_change);