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
  47 /*
  48  * Setting power level allows the card to go to sleep when not busy.
  49  *
  50  * We calculate a sleep command based on the required latency, which
  51  * we get from mac80211. In order to handle thermal throttling, we can
  52  * also use pre-defined power levels.
  53  */
  54
  55 /*
  56  * This defines the old power levels. They are still used by default
  57  * (level 1) and for thermal throttle (levels 3 through 5)
  58  */
  59
  60 struct iwl_power_vec_entry {
  61         struct iwl_powertable_cmd cmd;
  62         u8 no_dtim;     /* number of skip dtim */
  63 };
  64
  65 #define IWL_DTIM_RANGE_0_MAX    2
  66 #define IWL_DTIM_RANGE_1_MAX    10
  67
  68 #define NOSLP cpu_to_le16(0), 0, 0
  69 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  70 #define ASLP (IWL_POWER_POWER_SAVE_ENA_MSK |    \
  71                 IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
  72                 IWL_POWER_ADVANCE_PM_ENA_MSK)
  73 #define ASLP_TOUT(T) cpu_to_le32(T)
  74 #define TU_TO_USEC 1024
  75 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
  76 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
  77                                      cpu_to_le32(X1), \
  78                                      cpu_to_le32(X2), \
  79                                      cpu_to_le32(X3), \
  80                                      cpu_to_le32(X4)}
  81 /* default power management (not Tx power) table values */
  82 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
  83 /* DTIM 0 - 2 */
  84 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
  85         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 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 DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
  94 /* DTIM 3 - 10 */
  95 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
  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, 6, 10, 10)}, 2}
 101 };
 102
 103 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 104 /* DTIM 11 - */
 105 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
 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 /* advance power management */
 114 /* DTIM 0 - 2 */
 115 static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
 116         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 117                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 118         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 119                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 120         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 121                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 122         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 123                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 124         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 125                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 126 };
 127
 128
 129 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
 130 /* DTIM 3 - 10 */
 131 static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
 132         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 133                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 134         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 135                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 136         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 137                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 138         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 139                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 140         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 141                 SLP_VEC(1, 2, 6, 8, 0xFF), 0}, 2}
 142 };
 143
 144 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 145 /* DTIM 11 - */
 146 static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
 147         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 148                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 149         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 150                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 151         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 152                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 153         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 154                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 155         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 156                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 157 };
 158
 159 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
 160                                  struct iwl_powertable_cmd *cmd,
 161                                  enum iwl_power_level lvl, int period)
 162 {
 163         const struct iwl_power_vec_entry *table;
 164         int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
 165         int i;
 166         u8 skip;
 167         u32 slp_itrvl;
 168
 169         if (priv->cfg->adv_pm) {
 170                 table = apm_range_2;
 171                 if (period <= IWL_DTIM_RANGE_1_MAX)
 172                         table = apm_range_1;
 173                 if (period <= IWL_DTIM_RANGE_0_MAX)
 174                         table = apm_range_0;
 175         } else {
 176                 table = range_2;
 177                 if (period <= IWL_DTIM_RANGE_1_MAX)
 178                         table = range_1;
 179                 if (period <= IWL_DTIM_RANGE_0_MAX)
 180                         table = range_0;
 181         }
 182
 183         if (WARN_ON(lvl < 0 || lvl >= IWL_POWER_NUM))
 184                 memset(cmd, 0, sizeof(*cmd));
 185         else
 186                 *cmd = table[lvl].cmd;
 187
 188         if (period == 0) {
 189                 skip = 0;
 190                 period = 1;
 191                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 192                         max_sleep[i] =  1;
 193
 194         } else {
 195                 skip = table[lvl].no_dtim;
 196                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 197                         max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
 198                 max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
 199         }
 200
 201         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 202         /* figure out the listen interval based on dtim period and skip */
 203         if (slp_itrvl == 0xFF)
 204                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 205                         cpu_to_le32(period * (skip + 1));
 206
 207         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 208         if (slp_itrvl > period)
 209                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 210                         cpu_to_le32((slp_itrvl / period) * period);
 211
 212         if (skip)
 213                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 214         else
 215                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 216
 217         if (priv->cfg->base_params->shadow_reg_enable)
 218                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 219         else
 220                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 221
 222         if (iwl_advanced_bt_coexist(priv)) {
 223                 if (!priv->cfg->bt_params->bt_sco_disable)
 224                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 225                 else
 226                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 227         }
 228
 229
 230         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 231         if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
 232                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 233                         cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
 234
 235         /* enforce max sleep interval */
 236         for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
 237                 if (le32_to_cpu(cmd->sleep_interval[i]) >
 238                     (max_sleep[i] * period))
 239                         cmd->sleep_interval[i] =
 240                                 cpu_to_le32(max_sleep[i] * period);
 241                 if (i != (IWL_POWER_VEC_SIZE - 1)) {
 242                         if (le32_to_cpu(cmd->sleep_interval[i]) >
 243                             le32_to_cpu(cmd->sleep_interval[i+1]))
 244                                 cmd->sleep_interval[i] =
 245                                         cmd->sleep_interval[i+1];
 246                 }
 247         }
 248
 249         if (priv->power_data.bus_pm)
 250                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 251         else
 252                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 253
 254         IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
 255                         skip, period);
 256         IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
 257 }
 258
 259 static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
 260                                     struct iwl_powertable_cmd *cmd)
 261 {
 262         memset(cmd, 0, sizeof(*cmd));
 263
 264         if (priv->power_data.bus_pm)
 265                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 266
 267         IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
 268 }
 269
 270 static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
 271                                      struct iwl_powertable_cmd *cmd,
 272                                      int dynps_ms, int wakeup_period)
 273 {
 274         /*
 275          * These are the original power level 3 sleep successions. The
 276          * device may behave better with such succession and was also
 277          * only tested with that. Just like the original sleep commands,
 278          * also adjust the succession here to the wakeup_period below.
 279          * The ranges are the same as for the sleep commands, 0-2, 3-9
 280          * and >10, which is selected based on the DTIM interval for
 281          * the sleep index but here we use the wakeup period since that
 282          * is what we need to do for the latency requirements.
 283          */
 284         static const u8 slp_succ_r0[IWL_POWER_VEC_SIZE] = { 2, 2, 2, 2, 2 };
 285         static const u8 slp_succ_r1[IWL_POWER_VEC_SIZE] = { 2, 4, 6, 7, 9 };
 286         static const u8 slp_succ_r2[IWL_POWER_VEC_SIZE] = { 2, 7, 9, 9, 0xFF };
 287         const u8 *slp_succ = slp_succ_r0;
 288         int i;
 289
 290         if (wakeup_period > IWL_DTIM_RANGE_0_MAX)
 291                 slp_succ = slp_succ_r1;
 292         if (wakeup_period > IWL_DTIM_RANGE_1_MAX)
 293                 slp_succ = slp_succ_r2;
 294
 295         memset(cmd, 0, sizeof(*cmd));
 296
 297         cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
 298                      IWL_POWER_FAST_PD; /* no use seeing frames for others */
 299
 300         if (priv->power_data.bus_pm)
 301                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 302
 303         if (priv->cfg->base_params->shadow_reg_enable)
 304                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 305         else
 306                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 307
 308         if (iwl_advanced_bt_coexist(priv)) {
 309                 if (!priv->cfg->bt_params->bt_sco_disable)
 310                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 311                 else
 312                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 313         }
 314
 315         cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 316         cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 317
 318         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 319                 cmd->sleep_interval[i] =
 320                         cpu_to_le32(min_t(int, slp_succ[i], wakeup_period));
 321
 322         IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
 323 }
 324
 325 static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 326 {
 327         IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 328         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 329         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 330         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 331         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 332                         le32_to_cpu(cmd->sleep_interval[0]),
 333                         le32_to_cpu(cmd->sleep_interval[1]),
 334                         le32_to_cpu(cmd->sleep_interval[2]),
 335                         le32_to_cpu(cmd->sleep_interval[3]),
 336                         le32_to_cpu(cmd->sleep_interval[4]));
 337
 338         return trans_send_cmd_pdu(&priv->trans, POWER_TABLE_CMD, CMD_SYNC,
 339                                 sizeof(struct iwl_powertable_cmd), cmd);
 340 }
 341
 342 static void iwl_power_build_cmd(struct iwl_priv *priv,
 343                                 struct iwl_powertable_cmd *cmd)
 344 {
 345         bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 346         int dtimper;
 347
 348         dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 349
 350         if (priv->wowlan)
 351                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, dtimper);
 352         else if (!priv->cfg->base_params->no_idle_support &&
 353                  priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 354                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
 355         else if (iwl_tt_is_low_power_state(priv)) {
 356                 /* in thermal throttling low power state */
 357                 iwl_static_sleep_cmd(priv, cmd,
 358                     iwl_tt_current_power_mode(priv), dtimper);
 359         } else if (!enabled)
 360                 iwl_power_sleep_cam_cmd(priv, cmd);
 361         else if (priv->power_data.debug_sleep_level_override >= 0)
 362                 iwl_static_sleep_cmd(priv, cmd,
 363                                      priv->power_data.debug_sleep_level_override,
 364                                      dtimper);
 365         else if (iwlagn_mod_params.no_sleep_autoadjust) {
 366                 if (iwlagn_mod_params.power_level > IWL_POWER_INDEX_1 &&
 367                     iwlagn_mod_params.power_level <= IWL_POWER_INDEX_5)
 368                         iwl_static_sleep_cmd(priv, cmd,
 369                                 iwlagn_mod_params.power_level, dtimper);
 370                 else
 371                         iwl_static_sleep_cmd(priv, cmd,
 372                                 IWL_POWER_INDEX_1, dtimper);
 373         } else
 374                 iwl_power_fill_sleep_cmd(priv, cmd,
 375                                          priv->hw->conf.dynamic_ps_timeout,
 376                                          priv->hw->conf.max_sleep_period);
 377 }
 378
 379 int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 380                        bool force)
 381 {
 382         int ret;
 383         bool update_chains;
 384
 385         lockdep_assert_held(&priv->mutex);
 386
 387         /* Don't update the RX chain when chain noise calibration is running */
 388         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 389                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 390
 391         if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 392                 return 0;
 393
 394         if (!iwl_is_ready_rf(priv))
 395                 return -EIO;
 396
 397         /* scan complete use sleep_power_next, need to be updated */
 398         memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 399         if (test_bit(STATUS_SCANNING, &priv->status) && !force) {
 400                 IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
 401                 return 0;
 402         }
 403
 404         if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 405                 set_bit(STATUS_POWER_PMI, &priv->status);
 406
 407         ret = iwl_set_power(priv, cmd);
 408         if (!ret) {
 409                 if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 410                         clear_bit(STATUS_POWER_PMI, &priv->status);
 411
 412                 if (update_chains)
 413                         iwl_update_chain_flags(priv);
 414                 else
 415                         IWL_DEBUG_POWER(priv,
 416                                         "Cannot update the power, chain noise "
 417                                         "calibration running: %d\n",
 418                                         priv->chain_noise_data.state);
 419
 420                 memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
 421         } else
 422                 IWL_ERR(priv, "set power fail, ret = %d", ret);
 423
 424         return ret;
 425 }
 426
 427 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 428 {
 429         struct iwl_powertable_cmd cmd;
 430
 431         iwl_power_build_cmd(priv, &cmd);
 432         return iwl_power_set_mode(priv, &cmd, force);
 433 }
 434
 435 /* initialize to default */
 436 void iwl_power_initialize(struct iwl_priv *priv)
 437 {
 438         priv->power_data.bus_pm = bus_get_pm_support(priv->bus);
 439
 440         priv->power_data.debug_sleep_level_override = -1;
 441
 442         memset(&priv->power_data.sleep_cmd, 0,
 443                 sizeof(priv->power_data.sleep_cmd));
 444 }