drivers/net/wireless/iwlwifi/dvm/power.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2014 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 <net/mac80211.h>
  34 #include "iwl-io.h"
  35 #include "iwl-debug.h"
  36 #include "iwl-trans.h"
  37 #include "iwl-modparams.h"
  38 #include "dev.h"
  39 #include "agn.h"
  40 #include "commands.h"
  41 #include "power.h"
  42
  43 /*
  44  * Setting power level allows the card to go to sleep when not busy.
  45  *
  46  * We calculate a sleep command based on the required latency, which
  47  * we get from mac80211. In order to handle thermal throttling, we can
  48  * also use pre-defined power levels.
  49  */
  50
  51 /*
  52  * This defines the old power levels. They are still used by default
  53  * (level 1) and for thermal throttle (levels 3 through 5)
  54  */
  55
  56 struct iwl_power_vec_entry {
  57         struct iwl_powertable_cmd cmd;
  58         u8 no_dtim;     /* number of skip dtim */
  59 };
  60
  61 #define IWL_DTIM_RANGE_0_MAX    2
  62 #define IWL_DTIM_RANGE_1_MAX    10
  63
  64 #define NOSLP cpu_to_le16(0), 0, 0
  65 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  66 #define ASLP (IWL_POWER_POWER_SAVE_ENA_MSK |    \
  67                 IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
  68                 IWL_POWER_ADVANCE_PM_ENA_MSK)
  69 #define ASLP_TOUT(T) cpu_to_le32(T)
  70 #define TU_TO_USEC 1024
  71 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
  72 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
  73                                      cpu_to_le32(X1), \
  74                                      cpu_to_le32(X2), \
  75                                      cpu_to_le32(X3), \
  76                                      cpu_to_le32(X4)}
  77 /* default power management (not Tx power) table values */
  78 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
  79 /* DTIM 0 - 2 */
  80 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
  81         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 2, 2, 0xFF)}, 0},
  82         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  83         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  84         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  85         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  86 };
  87
  88
  89 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
  90 /* DTIM 3 - 10 */
  91 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
  92         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
  93         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
  94         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
  95         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
  96         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 6, 10, 10)}, 2}
  97 };
  98
  99 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 100 /* DTIM 11 - */
 101 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
 102         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 103         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 104         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 105         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 106         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 107 };
 108
 109 /* advance power management */
 110 /* DTIM 0 - 2 */
 111 static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
 112         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 113                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 114         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 115                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 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, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 122 };
 123
 124
 125 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
 126 /* DTIM 3 - 10 */
 127 static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
 128         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 129                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 130         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 131                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 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, 6, 8, 0xFF), 0}, 2}
 138 };
 139
 140 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 141 /* DTIM 11 - */
 142 static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
 143         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 144                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 145         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 146                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 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, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 153 };
 154
 155 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
 156                                  struct iwl_powertable_cmd *cmd,
 157                                  enum iwl_power_level lvl, int period)
 158 {
 159         const struct iwl_power_vec_entry *table;
 160         int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
 161         int i;
 162         u8 skip;
 163         u32 slp_itrvl;
 164
 165         if (priv->lib->adv_pm) {
 166                 table = apm_range_2;
 167                 if (period <= IWL_DTIM_RANGE_1_MAX)
 168                         table = apm_range_1;
 169                 if (period <= IWL_DTIM_RANGE_0_MAX)
 170                         table = apm_range_0;
 171         } else {
 172                 table = range_2;
 173                 if (period <= IWL_DTIM_RANGE_1_MAX)
 174                         table = range_1;
 175                 if (period <= IWL_DTIM_RANGE_0_MAX)
 176                         table = range_0;
 177         }
 178
 179         if (WARN_ON(lvl < 0 || lvl >= IWL_POWER_NUM))
 180                 memset(cmd, 0, sizeof(*cmd));
 181         else
 182                 *cmd = table[lvl].cmd;
 183
 184         if (period == 0) {
 185                 skip = 0;
 186                 period = 1;
 187                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 188                         max_sleep[i] =  1;
 189
 190         } else {
 191                 skip = table[lvl].no_dtim;
 192                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 193                         max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
 194                 max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
 195         }
 196
 197         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 198         /* figure out the listen interval based on dtim period and skip */
 199         if (slp_itrvl == 0xFF)
 200                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 201                         cpu_to_le32(period * (skip + 1));
 202
 203         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 204         if (slp_itrvl > period)
 205                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 206                         cpu_to_le32((slp_itrvl / period) * period);
 207
 208         if (skip)
 209                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 210         else
 211                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 212
 213         if (priv->cfg->base_params->shadow_reg_enable)
 214                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 215         else
 216                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 217
 218         if (iwl_advanced_bt_coexist(priv)) {
 219                 if (!priv->lib->bt_params->bt_sco_disable)
 220                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 221                 else
 222                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 223         }
 224
 225
 226         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 227         if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
 228                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 229                         cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
 230
 231         /* enforce max sleep interval */
 232         for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
 233                 if (le32_to_cpu(cmd->sleep_interval[i]) >
 234                     (max_sleep[i] * period))
 235                         cmd->sleep_interval[i] =
 236                                 cpu_to_le32(max_sleep[i] * period);
 237                 if (i != (IWL_POWER_VEC_SIZE - 1)) {
 238                         if (le32_to_cpu(cmd->sleep_interval[i]) >
 239                             le32_to_cpu(cmd->sleep_interval[i+1]))
 240                                 cmd->sleep_interval[i] =
 241                                         cmd->sleep_interval[i+1];
 242                 }
 243         }
 244
 245         if (priv->power_data.bus_pm)
 246                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 247         else
 248                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 249
 250         IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
 251                         skip, period);
 252         /* The power level here is 0-4 (used as array index), but user expects
 253         to see 1-5 (according to spec). */
 254         IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
 255 }
 256
 257 static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
 258                                     struct iwl_powertable_cmd *cmd)
 259 {
 260         memset(cmd, 0, sizeof(*cmd));
 261
 262         if (priv->power_data.bus_pm)
 263                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 264
 265         IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
 266 }
 267
 268 static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 269 {
 270         IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 271         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 272         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 273         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 274         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 275                         le32_to_cpu(cmd->sleep_interval[0]),
 276                         le32_to_cpu(cmd->sleep_interval[1]),
 277                         le32_to_cpu(cmd->sleep_interval[2]),
 278                         le32_to_cpu(cmd->sleep_interval[3]),
 279                         le32_to_cpu(cmd->sleep_interval[4]));
 280
 281         return iwl_dvm_send_cmd_pdu(priv, POWER_TABLE_CMD, CMD_SYNC,
 282                                 sizeof(struct iwl_powertable_cmd), cmd);
 283 }
 284
 285 static void iwl_power_build_cmd(struct iwl_priv *priv,
 286                                 struct iwl_powertable_cmd *cmd)
 287 {
 288         bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 289         int dtimper;
 290
 291         dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 292
 293         if (priv->wowlan)
 294                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, dtimper);
 295         else if (!priv->lib->no_idle_support &&
 296                  priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 297                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
 298         else if (iwl_tt_is_low_power_state(priv)) {
 299                 /* in thermal throttling low power state */
 300                 iwl_static_sleep_cmd(priv, cmd,
 301                     iwl_tt_current_power_mode(priv), dtimper);
 302         } else if (!enabled)
 303                 iwl_power_sleep_cam_cmd(priv, cmd);
 304         else if (priv->power_data.debug_sleep_level_override >= 0)
 305                 iwl_static_sleep_cmd(priv, cmd,
 306                                      priv->power_data.debug_sleep_level_override,
 307                                      dtimper);
 308         else {
 309                 /* Note that the user parameter is 1-5 (according to spec),
 310                 but we pass 0-4 because it acts as an array index. */
 311                 if (iwlwifi_mod_params.power_level > IWL_POWER_INDEX_1 &&
 312                     iwlwifi_mod_params.power_level <= IWL_POWER_NUM)
 313                         iwl_static_sleep_cmd(priv, cmd,
 314                                 iwlwifi_mod_params.power_level - 1, dtimper);
 315                 else
 316                         iwl_static_sleep_cmd(priv, cmd,
 317                                 IWL_POWER_INDEX_1, dtimper);
 318         }
 319 }
 320
 321 int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 322                        bool force)
 323 {
 324         int ret;
 325         bool update_chains;
 326
 327         lockdep_assert_held(&priv->mutex);
 328
 329         /* Don't update the RX chain when chain noise calibration is running */
 330         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 331                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 332
 333         if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 334                 return 0;
 335
 336         if (!iwl_is_ready_rf(priv))
 337                 return -EIO;
 338
 339         /* scan complete use sleep_power_next, need to be updated */
 340         memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 341         if (test_bit(STATUS_SCANNING, &priv->status) && !force) {
 342                 IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
 343                 return 0;
 344         }
 345
 346         if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 347                 iwl_dvm_set_pmi(priv, true);
 348
 349         ret = iwl_set_power(priv, cmd);
 350         if (!ret) {
 351                 if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 352                         iwl_dvm_set_pmi(priv, false);
 353
 354                 if (update_chains)
 355                         iwl_update_chain_flags(priv);
 356                 else
 357                         IWL_DEBUG_POWER(priv,
 358                                         "Cannot update the power, chain noise "
 359                                         "calibration running: %d\n",
 360                                         priv->chain_noise_data.state);
 361
 362                 memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
 363         } else
 364                 IWL_ERR(priv, "set power fail, ret = %d", ret);
 365
 366         return ret;
 367 }
 368
 369 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 370 {
 371         struct iwl_powertable_cmd cmd;
 372
 373         iwl_power_build_cmd(priv, &cmd);
 374         return iwl_power_set_mode(priv, &cmd, force);
 375 }
 376
 377 /* initialize to default */
 378 void iwl_power_initialize(struct iwl_priv *priv)
 379 {
 380         priv->power_data.bus_pm = priv->trans->pm_support;
 381
 382         priv->power_data.debug_sleep_level_override = -1;
 383
 384         memset(&priv->power_data.sleep_cmd, 0,
 385                 sizeof(priv->power_data.sleep_cmd));
 386 }