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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2013 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 #include <net/mac80211.h>
  35 #include "iwl-io.h"
  36 #include "iwl-debug.h"
  37 #include "iwl-trans.h"
  38 #include "iwl-modparams.h"
  39 #include "dev.h"
  40 #include "agn.h"
  41 #include "commands.h"
  42 #include "power.h"
  43
  44 /*
  45  * Setting power level allows the card to go to sleep when not busy.
  46  *
  47  * We calculate a sleep command based on the required latency, which
  48  * we get from mac80211. In order to handle thermal throttling, we can
  49  * also use pre-defined power levels.
  50  */
  51
  52 /*
  53  * This defines the old power levels. They are still used by default
  54  * (level 1) and for thermal throttle (levels 3 through 5)
  55  */
  56
  57 struct iwl_power_vec_entry {
  58         struct iwl_powertable_cmd cmd;
  59         u8 no_dtim;     /* number of skip dtim */
  60 };
  61
  62 #define IWL_DTIM_RANGE_0_MAX    2
  63 #define IWL_DTIM_RANGE_1_MAX    10
  64
  65 #define NOSLP cpu_to_le16(0), 0, 0
  66 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  67 #define ASLP (IWL_POWER_POWER_SAVE_ENA_MSK |    \
  68                 IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
  69                 IWL_POWER_ADVANCE_PM_ENA_MSK)
  70 #define ASLP_TOUT(T) cpu_to_le32(T)
  71 #define TU_TO_USEC 1024
  72 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
  73 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
  74                                      cpu_to_le32(X1), \
  75                                      cpu_to_le32(X2), \
  76                                      cpu_to_le32(X3), \
  77                                      cpu_to_le32(X4)}
  78 /* default power management (not Tx power) table values */
  79 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
  80 /* DTIM 0 - 2 */
  81 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
  82         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 2, 2, 0xFF)}, 0},
  83         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  84         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  85         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  86         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  87 };
  88
  89
  90 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
  91 /* DTIM 3 - 10 */
  92 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
  93         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
  94         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
  95         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
  96         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
  97         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 6, 10, 10)}, 2}
  98 };
  99
 100 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 101 /* DTIM 11 - */
 102 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
 103         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 104         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 105         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 106         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 107         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 108 };
 109
 110 /* advance power management */
 111 /* DTIM 0 - 2 */
 112 static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
 113         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 114                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 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, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 123 };
 124
 125
 126 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
 127 /* DTIM 3 - 10 */
 128 static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
 129         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 130                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 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, 6, 8, 0xFF), 0}, 2}
 139 };
 140
 141 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 142 /* DTIM 11 - */
 143 static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
 144         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 145                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 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, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 154 };
 155
 156 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
 157                                  struct iwl_powertable_cmd *cmd,
 158                                  enum iwl_power_level lvl, int period)
 159 {
 160         const struct iwl_power_vec_entry *table;
 161         int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
 162         int i;
 163         u8 skip;
 164         u32 slp_itrvl;
 165
 166         if (priv->lib->adv_pm) {
 167                 table = apm_range_2;
 168                 if (period <= IWL_DTIM_RANGE_1_MAX)
 169                         table = apm_range_1;
 170                 if (period <= IWL_DTIM_RANGE_0_MAX)
 171                         table = apm_range_0;
 172         } else {
 173                 table = range_2;
 174                 if (period <= IWL_DTIM_RANGE_1_MAX)
 175                         table = range_1;
 176                 if (period <= IWL_DTIM_RANGE_0_MAX)
 177                         table = range_0;
 178         }
 179
 180         if (WARN_ON(lvl < 0 || lvl >= IWL_POWER_NUM))
 181                 memset(cmd, 0, sizeof(*cmd));
 182         else
 183                 *cmd = table[lvl].cmd;
 184
 185         if (period == 0) {
 186                 skip = 0;
 187                 period = 1;
 188                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 189                         max_sleep[i] =  1;
 190
 191         } else {
 192                 skip = table[lvl].no_dtim;
 193                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 194                         max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
 195                 max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
 196         }
 197
 198         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 199         /* figure out the listen interval based on dtim period and skip */
 200         if (slp_itrvl == 0xFF)
 201                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 202                         cpu_to_le32(period * (skip + 1));
 203
 204         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 205         if (slp_itrvl > period)
 206                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 207                         cpu_to_le32((slp_itrvl / period) * period);
 208
 209         if (skip)
 210                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 211         else
 212                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 213
 214         if (priv->cfg->base_params->shadow_reg_enable)
 215                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 216         else
 217                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 218
 219         if (iwl_advanced_bt_coexist(priv)) {
 220                 if (!priv->lib->bt_params->bt_sco_disable)
 221                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 222                 else
 223                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 224         }
 225
 226
 227         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 228         if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
 229                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 230                         cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
 231
 232         /* enforce max sleep interval */
 233         for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
 234                 if (le32_to_cpu(cmd->sleep_interval[i]) >
 235                     (max_sleep[i] * period))
 236                         cmd->sleep_interval[i] =
 237                                 cpu_to_le32(max_sleep[i] * period);
 238                 if (i != (IWL_POWER_VEC_SIZE - 1)) {
 239                         if (le32_to_cpu(cmd->sleep_interval[i]) >
 240                             le32_to_cpu(cmd->sleep_interval[i+1]))
 241                                 cmd->sleep_interval[i] =
 242                                         cmd->sleep_interval[i+1];
 243                 }
 244         }
 245
 246         if (priv->power_data.bus_pm)
 247                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 248         else
 249                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 250
 251         IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
 252                         skip, period);
 253         /* The power level here is 0-4 (used as array index), but user expects
 254         to see 1-5 (according to spec). */
 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 int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 270 {
 271         IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 272         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 273         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 274         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 275         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 276                         le32_to_cpu(cmd->sleep_interval[0]),
 277                         le32_to_cpu(cmd->sleep_interval[1]),
 278                         le32_to_cpu(cmd->sleep_interval[2]),
 279                         le32_to_cpu(cmd->sleep_interval[3]),
 280                         le32_to_cpu(cmd->sleep_interval[4]));
 281
 282         return iwl_dvm_send_cmd_pdu(priv, POWER_TABLE_CMD, CMD_SYNC,
 283                                 sizeof(struct iwl_powertable_cmd), cmd);
 284 }
 285
 286 static void iwl_power_build_cmd(struct iwl_priv *priv,
 287                                 struct iwl_powertable_cmd *cmd)
 288 {
 289         bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 290         int dtimper;
 291
 292         dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 293
 294         if (priv->wowlan)
 295                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, dtimper);
 296         else if (!priv->lib->no_idle_support &&
 297                  priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 298                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
 299         else if (iwl_tt_is_low_power_state(priv)) {
 300                 /* in thermal throttling low power state */
 301                 iwl_static_sleep_cmd(priv, cmd,
 302                     iwl_tt_current_power_mode(priv), dtimper);
 303         } else if (!enabled)
 304                 iwl_power_sleep_cam_cmd(priv, cmd);
 305         else if (priv->power_data.debug_sleep_level_override >= 0)
 306                 iwl_static_sleep_cmd(priv, cmd,
 307                                      priv->power_data.debug_sleep_level_override,
 308                                      dtimper);
 309         else {
 310                 /* Note that the user parameter is 1-5 (according to spec),
 311                 but we pass 0-4 because it acts as an array index. */
 312                 if (iwlwifi_mod_params.power_level > IWL_POWER_INDEX_1 &&
 313                     iwlwifi_mod_params.power_level <= IWL_POWER_NUM)
 314                         iwl_static_sleep_cmd(priv, cmd,
 315                                 iwlwifi_mod_params.power_level - 1, dtimper);
 316                 else
 317                         iwl_static_sleep_cmd(priv, cmd,
 318                                 IWL_POWER_INDEX_1, dtimper);
 319         }
 320 }
 321
 322 int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 323                        bool force)
 324 {
 325         int ret;
 326         bool update_chains;
 327
 328         lockdep_assert_held(&priv->mutex);
 329
 330         /* Don't update the RX chain when chain noise calibration is running */
 331         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 332                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 333
 334         if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 335                 return 0;
 336
 337         if (!iwl_is_ready_rf(priv))
 338                 return -EIO;
 339
 340         /* scan complete use sleep_power_next, need to be updated */
 341         memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 342         if (test_bit(STATUS_SCANNING, &priv->status) && !force) {
 343                 IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
 344                 return 0;
 345         }
 346
 347         if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 348                 iwl_dvm_set_pmi(priv, true);
 349
 350         ret = iwl_set_power(priv, cmd);
 351         if (!ret) {
 352                 if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 353                         iwl_dvm_set_pmi(priv, false);
 354
 355                 if (update_chains)
 356                         iwl_update_chain_flags(priv);
 357                 else
 358                         IWL_DEBUG_POWER(priv,
 359                                         "Cannot update the power, chain noise "
 360                                         "calibration running: %d\n",
 361                                         priv->chain_noise_data.state);
 362
 363                 memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
 364         } else
 365                 IWL_ERR(priv, "set power fail, ret = %d", ret);
 366
 367         return ret;
 368 }
 369
 370 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 371 {
 372         struct iwl_powertable_cmd cmd;
 373
 374         iwl_power_build_cmd(priv, &cmd);
 375         return iwl_power_set_mode(priv, &cmd, force);
 376 }
 377
 378 /* initialize to default */
 379 void iwl_power_initialize(struct iwl_priv *priv)
 380 {
 381         priv->power_data.bus_pm = priv->trans->pm_support;
 382
 383         priv->power_data.debug_sleep_level_override = -1;
 384
 385         memset(&priv->power_data.sleep_cmd, 0,
 386                 sizeof(priv->power_data.sleep_cmd));
 387 }