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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2011 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/slab.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-agn.h"
  40 #include "iwl-core.h"
  41 #include "iwl-io.h"
  42 #include "iwl-commands.h"
  43 #include "iwl-debug.h"
  44 #include "iwl-power.h"
  45
  46 /*
  47  * Setting power level allows the card to go to sleep when not busy.
  48  *
  49  * We calculate a sleep command based on the required latency, which
  50  * we get from mac80211. In order to handle thermal throttling, we can
  51  * also use pre-defined power levels.
  52  */
  53
  54 /*
  55  * This defines the old power levels. They are still used by default
  56  * (level 1) and for thermal throttle (levels 3 through 5)
  57  */
  58
  59 struct iwl_power_vec_entry {
  60         struct iwl_powertable_cmd cmd;
  61         u8 no_dtim;     /* number of skip dtim */
  62 };
  63
  64 #define IWL_DTIM_RANGE_0_MAX    2
  65 #define IWL_DTIM_RANGE_1_MAX    10
  66
  67 #define NOSLP cpu_to_le16(0), 0, 0
  68 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  69 #define ASLP (IWL_POWER_POWER_SAVE_ENA_MSK |    \
  70                 IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
  71                 IWL_POWER_ADVANCE_PM_ENA_MSK)
  72 #define ASLP_TOUT(T) cpu_to_le32(T)
  73 #define TU_TO_USEC 1024
  74 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
  75 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
  76                                      cpu_to_le32(X1), \
  77                                      cpu_to_le32(X2), \
  78                                      cpu_to_le32(X3), \
  79                                      cpu_to_le32(X4)}
  80 /* default power management (not Tx power) table values */
  81 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
  82 /* DTIM 0 - 2 */
  83 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
  84         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 2, 2, 0xFF)}, 0},
  85         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  86         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  87         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  88         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  89 };
  90
  91
  92 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
  93 /* DTIM 3 - 10 */
  94 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
  95         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
  96         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
  97         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
  98         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
  99         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 6, 10, 10)}, 2}
 100 };
 101
 102 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 103 /* DTIM 11 - */
 104 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
 105         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 106         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 107         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 108         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 109         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 110 };
 111
 112 /* advance power management */
 113 /* DTIM 0 - 2 */
 114 static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
 115         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 116                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 117         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 118                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 119         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 120                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 121         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 122                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 123         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 124                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 125 };
 126
 127
 128 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
 129 /* DTIM 3 - 10 */
 130 static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
 131         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 132                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 133         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 134                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 135         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 136                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 137         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 138                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 139         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 140                 SLP_VEC(1, 2, 6, 8, 0xFF), 0}, 2}
 141 };
 142
 143 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 144 /* DTIM 11 - */
 145 static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
 146         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 147                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 148         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 149                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 150         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 151                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 152         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 153                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 154         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 155                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 156 };
 157
 158 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
 159                                  struct iwl_powertable_cmd *cmd,
 160                                  enum iwl_power_level lvl, int period)
 161 {
 162         const struct iwl_power_vec_entry *table;
 163         int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
 164         int i;
 165         u8 skip;
 166         u32 slp_itrvl;
 167
 168         if (priv->cfg->adv_pm) {
 169                 table = apm_range_2;
 170                 if (period <= IWL_DTIM_RANGE_1_MAX)
 171                         table = apm_range_1;
 172                 if (period <= IWL_DTIM_RANGE_0_MAX)
 173                         table = apm_range_0;
 174         } else {
 175                 table = range_2;
 176                 if (period <= IWL_DTIM_RANGE_1_MAX)
 177                         table = range_1;
 178                 if (period <= IWL_DTIM_RANGE_0_MAX)
 179                         table = range_0;
 180         }
 181
 182         if (WARN_ON(lvl < 0 || lvl >= IWL_POWER_NUM))
 183                 memset(cmd, 0, sizeof(*cmd));
 184         else
 185                 *cmd = table[lvl].cmd;
 186
 187         if (period == 0) {
 188                 skip = 0;
 189                 period = 1;
 190                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 191                         max_sleep[i] =  1;
 192
 193         } else {
 194                 skip = table[lvl].no_dtim;
 195                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 196                         max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
 197                 max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
 198         }
 199
 200         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 201         /* figure out the listen interval based on dtim period and skip */
 202         if (slp_itrvl == 0xFF)
 203                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 204                         cpu_to_le32(period * (skip + 1));
 205
 206         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 207         if (slp_itrvl > period)
 208                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 209                         cpu_to_le32((slp_itrvl / period) * period);
 210
 211         if (skip)
 212                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 213         else
 214                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 215
 216         if (priv->cfg->base_params->shadow_reg_enable)
 217                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 218         else
 219                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 220
 221         if (iwl_advanced_bt_coexist(priv)) {
 222                 if (!priv->cfg->bt_params->bt_sco_disable)
 223                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 224                 else
 225                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 226         }
 227
 228
 229         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 230         if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
 231                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 232                         cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
 233
 234         /* enforce max sleep interval */
 235         for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
 236                 if (le32_to_cpu(cmd->sleep_interval[i]) >
 237                     (max_sleep[i] * period))
 238                         cmd->sleep_interval[i] =
 239                                 cpu_to_le32(max_sleep[i] * period);
 240                 if (i != (IWL_POWER_VEC_SIZE - 1)) {
 241                         if (le32_to_cpu(cmd->sleep_interval[i]) >
 242                             le32_to_cpu(cmd->sleep_interval[i+1]))
 243                                 cmd->sleep_interval[i] =
 244                                         cmd->sleep_interval[i+1];
 245                 }
 246         }
 247
 248         if (priv->power_data.bus_pm)
 249                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 250         else
 251                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 252
 253         IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
 254                         skip, period);
 255         IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
 256 }
 257
 258 static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
 259                                     struct iwl_powertable_cmd *cmd)
 260 {
 261         memset(cmd, 0, sizeof(*cmd));
 262
 263         if (priv->power_data.bus_pm)
 264                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 265
 266         IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
 267 }
 268
 269 static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
 270                                      struct iwl_powertable_cmd *cmd,
 271                                      int dynps_ms, int wakeup_period)
 272 {
 273         /*
 274          * These are the original power level 3 sleep successions. The
 275          * device may behave better with such succession and was also
 276          * only tested with that. Just like the original sleep commands,
 277          * also adjust the succession here to the wakeup_period below.
 278          * The ranges are the same as for the sleep commands, 0-2, 3-9
 279          * and >10, which is selected based on the DTIM interval for
 280          * the sleep index but here we use the wakeup period since that
 281          * is what we need to do for the latency requirements.
 282          */
 283         static const u8 slp_succ_r0[IWL_POWER_VEC_SIZE] = { 2, 2, 2, 2, 2 };
 284         static const u8 slp_succ_r1[IWL_POWER_VEC_SIZE] = { 2, 4, 6, 7, 9 };
 285         static const u8 slp_succ_r2[IWL_POWER_VEC_SIZE] = { 2, 7, 9, 9, 0xFF };
 286         const u8 *slp_succ = slp_succ_r0;
 287         int i;
 288
 289         if (wakeup_period > IWL_DTIM_RANGE_0_MAX)
 290                 slp_succ = slp_succ_r1;
 291         if (wakeup_period > IWL_DTIM_RANGE_1_MAX)
 292                 slp_succ = slp_succ_r2;
 293
 294         memset(cmd, 0, sizeof(*cmd));
 295
 296         cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
 297                      IWL_POWER_FAST_PD; /* no use seeing frames for others */
 298
 299         if (priv->power_data.bus_pm)
 300                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 301
 302         if (priv->cfg->base_params->shadow_reg_enable)
 303                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 304         else
 305                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 306
 307         if (iwl_advanced_bt_coexist(priv)) {
 308                 if (!priv->cfg->bt_params->bt_sco_disable)
 309                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 310                 else
 311                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 312         }
 313
 314         cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 315         cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 316
 317         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 318                 cmd->sleep_interval[i] =
 319                         cpu_to_le32(min_t(int, slp_succ[i], wakeup_period));
 320
 321         IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
 322 }
 323
 324 static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 325 {
 326         IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 327         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 328         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 329         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 330         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 331                         le32_to_cpu(cmd->sleep_interval[0]),
 332                         le32_to_cpu(cmd->sleep_interval[1]),
 333                         le32_to_cpu(cmd->sleep_interval[2]),
 334                         le32_to_cpu(cmd->sleep_interval[3]),
 335                         le32_to_cpu(cmd->sleep_interval[4]));
 336
 337         return iwl_send_cmd_pdu(priv, POWER_TABLE_CMD,
 338                                 sizeof(struct iwl_powertable_cmd), cmd);
 339 }
 340
 341 static void iwl_power_build_cmd(struct iwl_priv *priv,
 342                                 struct iwl_powertable_cmd *cmd)
 343 {
 344         bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 345         int dtimper;
 346
 347         dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 348
 349         if (priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 350                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
 351         else if (iwl_tt_is_low_power_state(priv)) {
 352                 /* in thermal throttling low power state */
 353                 iwl_static_sleep_cmd(priv, cmd,
 354                     iwl_tt_current_power_mode(priv), dtimper);
 355         } else if (!enabled)
 356                 iwl_power_sleep_cam_cmd(priv, cmd);
 357         else if (priv->power_data.debug_sleep_level_override >= 0)
 358                 iwl_static_sleep_cmd(priv, cmd,
 359                                      priv->power_data.debug_sleep_level_override,
 360                                      dtimper);
 361         else if (iwlagn_mod_params.no_sleep_autoadjust)
 362                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_1, dtimper);
 363         else
 364                 iwl_power_fill_sleep_cmd(priv, cmd,
 365                                          priv->hw->conf.dynamic_ps_timeout,
 366                                          priv->hw->conf.max_sleep_period);
 367 }
 368
 369 int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 370                        bool force)
 371 {
 372         int ret;
 373         bool update_chains;
 374
 375         lockdep_assert_held(&priv->mutex);
 376
 377         /* Don't update the RX chain when chain noise calibration is running */
 378         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 379                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 380
 381         if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 382                 return 0;
 383
 384         if (!iwl_is_ready_rf(priv))
 385                 return -EIO;
 386
 387         /* scan complete use sleep_power_next, need to be updated */
 388         memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 389         if (test_bit(STATUS_SCANNING, &priv->status) && !force) {
 390                 IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
 391                 return 0;
 392         }
 393
 394         if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 395                 set_bit(STATUS_POWER_PMI, &priv->status);
 396
 397         ret = iwl_set_power(priv, cmd);
 398         if (!ret) {
 399                 if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 400                         clear_bit(STATUS_POWER_PMI, &priv->status);
 401
 402                 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
 403                         priv->cfg->ops->lib->update_chain_flags(priv);
 404                 else if (priv->cfg->ops->lib->update_chain_flags)
 405                         IWL_DEBUG_POWER(priv,
 406                                         "Cannot update the power, chain noise "
 407                                         "calibration running: %d\n",
 408                                         priv->chain_noise_data.state);
 409
 410                 memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
 411         } else
 412                 IWL_ERR(priv, "set power fail, ret = %d", ret);
 413
 414         return ret;
 415 }
 416
 417 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 418 {
 419         struct iwl_powertable_cmd cmd;
 420
 421         iwl_power_build_cmd(priv, &cmd);
 422         return iwl_power_set_mode(priv, &cmd, force);
 423 }
 424
 425 /* initialize to default */
 426 void iwl_power_initialize(struct iwl_priv *priv)
 427 {
 428         priv->power_data.bus_pm = priv->bus.ops->get_pm_support(&priv->bus);
 429
 430         priv->power_data.debug_sleep_level_override = -1;
 431
 432         memset(&priv->power_data.sleep_cmd, 0,
 433                 sizeof(priv->power_data.sleep_cmd));
 434 }