LXR linux/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
  43static bool force_cam = true;
  44module_param(force_cam, bool, 0644);
  45MODULE_PARM_DESC(force_cam, "force continuously aware mode (no power saving at all)");
  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
  60struct 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 */
  84static 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 */
  95static 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 - */
 105static 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 */
 115static 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 */
 131static 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 - */
 146static 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
 159static 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->lib->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->lib->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        /* The power level here is 0-4 (used as array index), but user expects
 257        to see 1-5 (according to spec). */
 258        IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
 259}
 260
 261static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
 262                                    struct iwl_powertable_cmd *cmd)
 263{
 264        memset(cmd, 0, sizeof(*cmd));
 265
 266        if (priv->power_data.bus_pm)
 267                cmd->flags |= IWL_POWER_PCI_PM_MSK;
 268
 269        IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
 270}
 271
 272static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 273{
 274        IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 275        IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 276        IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 277        IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 278        IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 279                        le32_to_cpu(cmd->sleep_interval[0]),
 280                        le32_to_cpu(cmd->sleep_interval[1]),
 281                        le32_to_cpu(cmd->sleep_interval[2]),
 282                        le32_to_cpu(cmd->sleep_interval[3]),
 283                        le32_to_cpu(cmd->sleep_interval[4]));
 284
 285        return iwl_dvm_send_cmd_pdu(priv, POWER_TABLE_CMD, 0,
 286                                sizeof(struct iwl_powertable_cmd), cmd);
 287}
 288
 289static void iwl_power_build_cmd(struct iwl_priv *priv,
 290                                struct iwl_powertable_cmd *cmd)
 291{
 292        bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 293        int dtimper;
 294
 295        if (force_cam) {
 296                iwl_power_sleep_cam_cmd(priv, cmd);
 297                return;
 298        }
 299
 300        dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 301
 302        if (priv->wowlan)
 303                iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, dtimper);
 304        else if (!priv->lib->no_idle_support &&
 305                 priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 306                iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
 307        else if (iwl_tt_is_low_power_state(priv)) {
 308                /* in thermal throttling low power state */
 309                iwl_static_sleep_cmd(priv, cmd,
 310                    iwl_tt_current_power_mode(priv), dtimper);
 311        } else if (!enabled)
 312                iwl_power_sleep_cam_cmd(priv, cmd);
 313        else if (priv->power_data.debug_sleep_level_override >= 0)
 314                iwl_static_sleep_cmd(priv, cmd,
 315                                     priv->power_data.debug_sleep_level_override,
 316                                     dtimper);
 317        else {
 318                /* Note that the user parameter is 1-5 (according to spec),
 319                but we pass 0-4 because it acts as an array index. */
 320                if (iwlwifi_mod_params.power_level > IWL_POWER_INDEX_1 &&
 321                    iwlwifi_mod_params.power_level <= IWL_POWER_NUM)
 322                        iwl_static_sleep_cmd(priv, cmd,
 323                                iwlwifi_mod_params.power_level - 1, dtimper);
 324                else
 325                        iwl_static_sleep_cmd(priv, cmd,
 326                                IWL_POWER_INDEX_1, dtimper);
 327        }
 328}
 329
 330int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 331                       bool force)
 332{
 333        int ret;
 334        bool update_chains;
 335
 336        lockdep_assert_held(&priv->mutex);
 337
 338        /* Don't update the RX chain when chain noise calibration is running */
 339        update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 340                        priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 341
 342        if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 343                return 0;
 344
 345        if (!iwl_is_ready_rf(priv))
 346                return -EIO;
 347
 348        /* scan complete use sleep_power_next, need to be updated */
 349        memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 350        if (test_bit(STATUS_SCANNING, &priv->status) && !force) {
 351                IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
 352                return 0;
 353        }
 354
 355        if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 356                iwl_dvm_set_pmi(priv, true);
 357
 358        ret = iwl_set_power(priv, cmd);
 359        if (!ret) {
 360                if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 361                        iwl_dvm_set_pmi(priv, false);
 362
 363                if (update_chains)
 364                        iwl_update_chain_flags(priv);
 365                else
 366                        IWL_DEBUG_POWER(priv,
 367                                        "Cannot update the power, chain noise "
 368                                        "calibration running: %d\n",
 369                                        priv->chain_noise_data.state);
 370
 371                memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
 372        } else
 373                IWL_ERR(priv, "set power fail, ret = %d\n", ret);
 374
 375        return ret;
 376}
 377
 378int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 379{
 380        struct iwl_powertable_cmd cmd;
 381
 382        iwl_power_build_cmd(priv, &cmd);
 383        return iwl_power_set_mode(priv, &cmd, force);
 384}
 385
 386/* initialize to default */
 387void iwl_power_initialize(struct iwl_priv *priv)
 388{
 389        priv->power_data.bus_pm = priv->trans->pm_support;
 390
 391        priv->power_data.debug_sleep_level_override = -1;
 392
 393        memset(&priv->power_data.sleep_cmd, 0,
 394                sizeof(priv->power_data.sleep_cmd));
 395}
 396