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 #include "iwl-trans.h"
  46 #include "iwl-shared.h"
  47
  48 /*
  49  * Setting power level allows the card to go to sleep when not busy.
  50  *
  51  * We calculate a sleep command based on the required latency, which
  52  * we get from mac80211. In order to handle thermal throttling, we can
  53  * also use pre-defined power levels.
  54  */
  55
  56 /*
  57  * This defines the old power levels. They are still used by default
  58  * (level 1) and for thermal throttle (levels 3 through 5)
  59  */
  60
  61 struct iwl_power_vec_entry {
  62         struct iwl_powertable_cmd cmd;
  63         u8 no_dtim;     /* number of skip dtim */
  64 };
  65
  66 #define IWL_DTIM_RANGE_0_MAX    2
  67 #define IWL_DTIM_RANGE_1_MAX    10
  68
  69 #define NOSLP cpu_to_le16(0), 0, 0
  70 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  71 #define ASLP (IWL_POWER_POWER_SAVE_ENA_MSK |    \
  72                 IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
  73                 IWL_POWER_ADVANCE_PM_ENA_MSK)
  74 #define ASLP_TOUT(T) cpu_to_le32(T)
  75 #define TU_TO_USEC 1024
  76 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
  77 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
  78                                      cpu_to_le32(X1), \
  79                                      cpu_to_le32(X2), \
  80                                      cpu_to_le32(X3), \
  81                                      cpu_to_le32(X4)}
  82 /* default power management (not Tx power) table values */
  83 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
  84 /* DTIM 0 - 2 */
  85 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
  86         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 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 DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
  95 /* DTIM 3 - 10 */
  96 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
  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, 6, 10, 10)}, 2}
 102 };
 103
 104 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 105 /* DTIM 11 - */
 106 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
 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 /* advance power management */
 115 /* DTIM 0 - 2 */
 116 static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
 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, 4, 6, 0xFF), 0}, 0},
 125         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 126                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 127 };
 128
 129
 130 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
 131 /* DTIM 3 - 10 */
 132 static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
 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, 4, 6, 0xFF), 0}, 0},
 141         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 142                 SLP_VEC(1, 2, 6, 8, 0xFF), 0}, 2}
 143 };
 144
 145 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 146 /* DTIM 11 - */
 147 static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
 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, 4, 6, 0xFF), 0}, 0},
 156         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 157                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 158 };
 159
 160 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
 161                                  struct iwl_powertable_cmd *cmd,
 162                                  enum iwl_power_level lvl, int period)
 163 {
 164         const struct iwl_power_vec_entry *table;
 165         int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
 166         int i;
 167         u8 skip;
 168         u32 slp_itrvl;
 169
 170         if (cfg(priv)->adv_pm) {
 171                 table = apm_range_2;
 172                 if (period <= IWL_DTIM_RANGE_1_MAX)
 173                         table = apm_range_1;
 174                 if (period <= IWL_DTIM_RANGE_0_MAX)
 175                         table = apm_range_0;
 176         } else {
 177                 table = range_2;
 178                 if (period <= IWL_DTIM_RANGE_1_MAX)
 179                         table = range_1;
 180                 if (period <= IWL_DTIM_RANGE_0_MAX)
 181                         table = range_0;
 182         }
 183
 184         if (WARN_ON(lvl < 0 || lvl >= IWL_POWER_NUM))
 185                 memset(cmd, 0, sizeof(*cmd));
 186         else
 187                 *cmd = table[lvl].cmd;
 188
 189         if (period == 0) {
 190                 skip = 0;
 191                 period = 1;
 192                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 193                         max_sleep[i] =  1;
 194
 195         } else {
 196                 skip = table[lvl].no_dtim;
 197                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 198                         max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
 199                 max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
 200         }
 201
 202         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 203         /* figure out the listen interval based on dtim period and skip */
 204         if (slp_itrvl == 0xFF)
 205                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 206                         cpu_to_le32(period * (skip + 1));
 207
 208         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 209         if (slp_itrvl > period)
 210                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 211                         cpu_to_le32((slp_itrvl / period) * period);
 212
 213         if (skip)
 214                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 215         else
 216                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 217
 218         if (hw_params(priv).shadow_reg_enable)
 219                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 220         else
 221                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 222
 223         if (iwl_advanced_bt_coexist(priv)) {
 224                 if (!cfg(priv)->bt_params->bt_sco_disable)
 225                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 226                 else
 227                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 228         }
 229
 230
 231         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 232         if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
 233                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 234                         cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
 235
 236         /* enforce max sleep interval */
 237         for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
 238                 if (le32_to_cpu(cmd->sleep_interval[i]) >
 239                     (max_sleep[i] * period))
 240                         cmd->sleep_interval[i] =
 241                                 cpu_to_le32(max_sleep[i] * period);
 242                 if (i != (IWL_POWER_VEC_SIZE - 1)) {
 243                         if (le32_to_cpu(cmd->sleep_interval[i]) >
 244                             le32_to_cpu(cmd->sleep_interval[i+1]))
 245                                 cmd->sleep_interval[i] =
 246                                         cmd->sleep_interval[i+1];
 247                 }
 248         }
 249
 250         if (priv->power_data.bus_pm)
 251                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 252         else
 253                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 254
 255         IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
 256                         skip, period);
 257         IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
 258 }
 259
 260 static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
 261                                     struct iwl_powertable_cmd *cmd)
 262 {
 263         memset(cmd, 0, sizeof(*cmd));
 264
 265         if (priv->power_data.bus_pm)
 266                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 267
 268         IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
 269 }
 270
 271 static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
 272                                      struct iwl_powertable_cmd *cmd,
 273                                      int dynps_ms, int wakeup_period)
 274 {
 275         /*
 276          * These are the original power level 3 sleep successions. The
 277          * device may behave better with such succession and was also
 278          * only tested with that. Just like the original sleep commands,
 279          * also adjust the succession here to the wakeup_period below.
 280          * The ranges are the same as for the sleep commands, 0-2, 3-9
 281          * and >10, which is selected based on the DTIM interval for
 282          * the sleep index but here we use the wakeup period since that
 283          * is what we need to do for the latency requirements.
 284          */
 285         static const u8 slp_succ_r0[IWL_POWER_VEC_SIZE] = { 2, 2, 2, 2, 2 };
 286         static const u8 slp_succ_r1[IWL_POWER_VEC_SIZE] = { 2, 4, 6, 7, 9 };
 287         static const u8 slp_succ_r2[IWL_POWER_VEC_SIZE] = { 2, 7, 9, 9, 0xFF };
 288         const u8 *slp_succ = slp_succ_r0;
 289         int i;
 290
 291         if (wakeup_period > IWL_DTIM_RANGE_0_MAX)
 292                 slp_succ = slp_succ_r1;
 293         if (wakeup_period > IWL_DTIM_RANGE_1_MAX)
 294                 slp_succ = slp_succ_r2;
 295
 296         memset(cmd, 0, sizeof(*cmd));
 297
 298         cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
 299                      IWL_POWER_FAST_PD; /* no use seeing frames for others */
 300
 301         if (priv->power_data.bus_pm)
 302                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 303
 304         if (hw_params(priv).shadow_reg_enable)
 305                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 306         else
 307                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 308
 309         if (iwl_advanced_bt_coexist(priv)) {
 310                 if (!cfg(priv)->bt_params->bt_sco_disable)
 311                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 312                 else
 313                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 314         }
 315
 316         cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 317         cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 318
 319         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 320                 cmd->sleep_interval[i] =
 321                         cpu_to_le32(min_t(int, slp_succ[i], wakeup_period));
 322
 323         IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
 324 }
 325
 326 static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 327 {
 328         IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 329         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 330         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 331         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 332         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 333                         le32_to_cpu(cmd->sleep_interval[0]),
 334                         le32_to_cpu(cmd->sleep_interval[1]),
 335                         le32_to_cpu(cmd->sleep_interval[2]),
 336                         le32_to_cpu(cmd->sleep_interval[3]),
 337                         le32_to_cpu(cmd->sleep_interval[4]));
 338
 339         return iwl_trans_send_cmd_pdu(trans(priv), POWER_TABLE_CMD, CMD_SYNC,
 340                                 sizeof(struct iwl_powertable_cmd), cmd);
 341 }
 342
 343 static void iwl_power_build_cmd(struct iwl_priv *priv,
 344                                 struct iwl_powertable_cmd *cmd)
 345 {
 346         bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 347         int dtimper;
 348
 349         dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 350
 351         if (priv->shrd->wowlan)
 352                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, dtimper);
 353         else if (!cfg(priv)->base_params->no_idle_support &&
 354                  priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 355                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
 356         else if (iwl_tt_is_low_power_state(priv)) {
 357                 /* in thermal throttling low power state */
 358                 iwl_static_sleep_cmd(priv, cmd,
 359                     iwl_tt_current_power_mode(priv), dtimper);
 360         } else if (!enabled)
 361                 iwl_power_sleep_cam_cmd(priv, cmd);
 362         else if (priv->power_data.debug_sleep_level_override >= 0)
 363                 iwl_static_sleep_cmd(priv, cmd,
 364                                      priv->power_data.debug_sleep_level_override,
 365                                      dtimper);
 366         else if (iwlagn_mod_params.no_sleep_autoadjust) {
 367                 if (iwlagn_mod_params.power_level > IWL_POWER_INDEX_1 &&
 368                     iwlagn_mod_params.power_level <= IWL_POWER_INDEX_5)
 369                         iwl_static_sleep_cmd(priv, cmd,
 370                                 iwlagn_mod_params.power_level, dtimper);
 371                 else
 372                         iwl_static_sleep_cmd(priv, cmd,
 373                                 IWL_POWER_INDEX_1, dtimper);
 374         } else
 375                 iwl_power_fill_sleep_cmd(priv, cmd,
 376                                          priv->hw->conf.dynamic_ps_timeout,
 377                                          priv->hw->conf.max_sleep_period);
 378 }
 379
 380 int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 381                        bool force)
 382 {
 383         int ret;
 384         bool update_chains;
 385
 386         lockdep_assert_held(&priv->shrd->mutex);
 387
 388         /* Don't update the RX chain when chain noise calibration is running */
 389         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 390                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 391
 392         if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 393                 return 0;
 394
 395         if (!iwl_is_ready_rf(priv->shrd))
 396                 return -EIO;
 397
 398         /* scan complete use sleep_power_next, need to be updated */
 399         memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 400         if (test_bit(STATUS_SCANNING, &priv->shrd->status) && !force) {
 401                 IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
 402                 return 0;
 403         }
 404
 405         if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 406                 set_bit(STATUS_POWER_PMI, &priv->shrd->status);
 407
 408         ret = iwl_set_power(priv, cmd);
 409         if (!ret) {
 410                 if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 411                         clear_bit(STATUS_POWER_PMI, &priv->shrd->status);
 412
 413                 if (update_chains)
 414                         iwl_update_chain_flags(priv);
 415                 else
 416                         IWL_DEBUG_POWER(priv,
 417                                         "Cannot update the power, chain noise "
 418                                         "calibration running: %d\n",
 419                                         priv->chain_noise_data.state);
 420
 421                 memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
 422         } else
 423                 IWL_ERR(priv, "set power fail, ret = %d", ret);
 424
 425         return ret;
 426 }
 427
 428 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 429 {
 430         struct iwl_powertable_cmd cmd;
 431
 432         iwl_power_build_cmd(priv, &cmd);
 433         return iwl_power_set_mode(priv, &cmd, force);
 434 }
 435
 436 /* initialize to default */
 437 void iwl_power_initialize(struct iwl_priv *priv)
 438 {
 439         priv->power_data.bus_pm = bus_get_pm_support(bus(priv));
 440
 441         priv->power_data.debug_sleep_level_override = -1;
 442
 443         memset(&priv->power_data.sleep_cmd, 0,
 444                 sizeof(priv->power_data.sleep_cmd));
 445 }