LXR linux/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
  57struct 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 */
  81static 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 */
  92static 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 - */
 102static 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 */
 112static 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 */
 128static 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 - */
 143static 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
 156static 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
 258static 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
 269static 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
 286static 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
 322int 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
 370int 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 */
 379void 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}
 388