drivers/net/wireless/iwlwifi/iwl-power.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2010 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-core.h"
  40 #include "iwl-io.h"
  41 #include "iwl-commands.h"
  42 #include "iwl-debug.h"
  43 #include "iwl-power.h"
  44
  45 /*
  46  * Setting power level allows the card to go to sleep when not busy.
  47  *
  48  * We calculate a sleep command based on the required latency, which
  49  * we get from mac80211. In order to handle thermal throttling, we can
  50  * also use pre-defined power levels.
  51  */
  52
  53 /*
  54  * For now, keep using power level 1 instead of automatically
  55  * adjusting ...
  56  */
  57 bool no_sleep_autoadjust = true;
  58 module_param(no_sleep_autoadjust, bool, S_IRUGO);
  59 MODULE_PARM_DESC(no_sleep_autoadjust,
  60                  "don't automatically adjust sleep level "
  61                  "according to maximum network latency");
  62
  63 /*
  64  * This defines the old power levels. They are still used by default
  65  * (level 1) and for thermal throttle (levels 3 through 5)
  66  */
  67
  68 struct iwl_power_vec_entry {
  69         struct iwl_powertable_cmd cmd;
  70         u8 no_dtim;     /* number of skip dtim */
  71 };
  72
  73 #define IWL_DTIM_RANGE_0_MAX    2
  74 #define IWL_DTIM_RANGE_1_MAX    10
  75
  76 #define NOSLP cpu_to_le16(0), 0, 0
  77 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  78 #define TU_TO_USEC 1024
  79 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
  80 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
  81                                      cpu_to_le32(X1), \
  82                                      cpu_to_le32(X2), \
  83                                      cpu_to_le32(X3), \
  84                                      cpu_to_le32(X4)}
  85 /* default power management (not Tx power) table values */
  86 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
  87 /* DTIM 0 - 2 */
  88 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
  89         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 2, 2, 0xFF)}, 0},
  90         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  91         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  92         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  93         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  94 };
  95
  96
  97 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
  98 /* DTIM 3 - 10 */
  99 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
 100         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
 101         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
 102         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
 103         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
 104         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 6, 10, 10)}, 2}
 105 };
 106
 107 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 108 /* DTIM 11 - */
 109 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
 110         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 111         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 112         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 113         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 114         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 115 };
 116
 117 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
 118                                  struct iwl_powertable_cmd *cmd,
 119                                  enum iwl_power_level lvl, int period)
 120 {
 121         const struct iwl_power_vec_entry *table;
 122         int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
 123         int i;
 124         u8 skip;
 125         u32 slp_itrvl;
 126
 127         table = range_2;
 128         if (period <= IWL_DTIM_RANGE_1_MAX)
 129                 table = range_1;
 130         if (period <= IWL_DTIM_RANGE_0_MAX)
 131                 table = range_0;
 132
 133         BUG_ON(lvl < 0 || lvl >= IWL_POWER_NUM);
 134
 135         *cmd = table[lvl].cmd;
 136
 137         if (period == 0) {
 138                 skip = 0;
 139                 period = 1;
 140                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 141                         max_sleep[i] =  1;
 142
 143         } else {
 144                 skip = table[lvl].no_dtim;
 145                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 146                         max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
 147                 max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
 148         }
 149
 150         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 151         /* figure out the listen interval based on dtim period and skip */
 152         if (slp_itrvl == 0xFF)
 153                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 154                         cpu_to_le32(period * (skip + 1));
 155
 156         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 157         if (slp_itrvl > period)
 158                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 159                         cpu_to_le32((slp_itrvl / period) * period);
 160
 161         if (skip)
 162                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 163         else
 164                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 165
 166         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 167         if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
 168                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 169                         cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
 170
 171         /* enforce max sleep interval */
 172         for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
 173                 if (le32_to_cpu(cmd->sleep_interval[i]) >
 174                     (max_sleep[i] * period))
 175                         cmd->sleep_interval[i] =
 176                                 cpu_to_le32(max_sleep[i] * period);
 177                 if (i != (IWL_POWER_VEC_SIZE - 1)) {
 178                         if (le32_to_cpu(cmd->sleep_interval[i]) >
 179                             le32_to_cpu(cmd->sleep_interval[i+1]))
 180                                 cmd->sleep_interval[i] =
 181                                         cmd->sleep_interval[i+1];
 182                 }
 183         }
 184
 185         if (priv->power_data.pci_pm)
 186                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 187         else
 188                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 189
 190         IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
 191                         skip, period);
 192         IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
 193 }
 194
 195 static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
 196                                     struct iwl_powertable_cmd *cmd)
 197 {
 198         memset(cmd, 0, sizeof(*cmd));
 199
 200         if (priv->power_data.pci_pm)
 201                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 202
 203         IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
 204 }
 205
 206 static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
 207                                      struct iwl_powertable_cmd *cmd,
 208                                      int dynps_ms, int wakeup_period)
 209 {
 210         /*
 211          * These are the original power level 3 sleep successions. The
 212          * device may behave better with such succession and was also
 213          * only tested with that. Just like the original sleep commands,
 214          * also adjust the succession here to the wakeup_period below.
 215          * The ranges are the same as for the sleep commands, 0-2, 3-9
 216          * and >10, which is selected based on the DTIM interval for
 217          * the sleep index but here we use the wakeup period since that
 218          * is what we need to do for the latency requirements.
 219          */
 220         static const u8 slp_succ_r0[IWL_POWER_VEC_SIZE] = { 2, 2, 2, 2, 2 };
 221         static const u8 slp_succ_r1[IWL_POWER_VEC_SIZE] = { 2, 4, 6, 7, 9 };
 222         static const u8 slp_succ_r2[IWL_POWER_VEC_SIZE] = { 2, 7, 9, 9, 0xFF };
 223         const u8 *slp_succ = slp_succ_r0;
 224         int i;
 225
 226         if (wakeup_period > IWL_DTIM_RANGE_0_MAX)
 227                 slp_succ = slp_succ_r1;
 228         if (wakeup_period > IWL_DTIM_RANGE_1_MAX)
 229                 slp_succ = slp_succ_r2;
 230
 231         memset(cmd, 0, sizeof(*cmd));
 232
 233         cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
 234                      IWL_POWER_FAST_PD; /* no use seeing frames for others */
 235
 236         if (priv->power_data.pci_pm)
 237                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 238
 239         cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 240         cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 241
 242         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 243                 cmd->sleep_interval[i] =
 244                         cpu_to_le32(min_t(int, slp_succ[i], wakeup_period));
 245
 246         IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
 247 }
 248
 249 static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 250 {
 251         IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 252         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 253         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 254         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 255         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 256                         le32_to_cpu(cmd->sleep_interval[0]),
 257                         le32_to_cpu(cmd->sleep_interval[1]),
 258                         le32_to_cpu(cmd->sleep_interval[2]),
 259                         le32_to_cpu(cmd->sleep_interval[3]),
 260                         le32_to_cpu(cmd->sleep_interval[4]));
 261
 262         return iwl_send_cmd_pdu(priv, POWER_TABLE_CMD,
 263                                 sizeof(struct iwl_powertable_cmd), cmd);
 264 }
 265
 266 /* priv->mutex must be held */
 267 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 268 {
 269         int ret = 0;
 270         bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 271         bool update_chains;
 272         struct iwl_powertable_cmd cmd;
 273         int dtimper;
 274
 275         /* Don't update the RX chain when chain noise calibration is running */
 276         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 277                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 278
 279         dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 280
 281         if (priv->cfg->base_params->broken_powersave)
 282                 iwl_power_sleep_cam_cmd(priv, &cmd);
 283         else if (priv->cfg->base_params->supports_idle &&
 284                  priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 285                 iwl_static_sleep_cmd(priv, &cmd, IWL_POWER_INDEX_5, 20);
 286         else if (priv->cfg->ops->lib->tt_ops.lower_power_detection &&
 287                  priv->cfg->ops->lib->tt_ops.tt_power_mode &&
 288                  priv->cfg->ops->lib->tt_ops.lower_power_detection(priv)) {
 289                 /* in thermal throttling low power state */
 290                 iwl_static_sleep_cmd(priv, &cmd,
 291                     priv->cfg->ops->lib->tt_ops.tt_power_mode(priv), dtimper);
 292         } else if (!enabled)
 293                 iwl_power_sleep_cam_cmd(priv, &cmd);
 294         else if (priv->power_data.debug_sleep_level_override >= 0)
 295                 iwl_static_sleep_cmd(priv, &cmd,
 296                                      priv->power_data.debug_sleep_level_override,
 297                                      dtimper);
 298         else if (no_sleep_autoadjust)
 299                 iwl_static_sleep_cmd(priv, &cmd, IWL_POWER_INDEX_1, dtimper);
 300         else
 301                 iwl_power_fill_sleep_cmd(priv, &cmd,
 302                                          priv->hw->conf.dynamic_ps_timeout,
 303                                          priv->hw->conf.max_sleep_period);
 304
 305         if (iwl_is_ready_rf(priv) &&
 306             (memcmp(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd)) || force)) {
 307                 if (cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 308                         set_bit(STATUS_POWER_PMI, &priv->status);
 309
 310                 ret = iwl_set_power(priv, &cmd);
 311                 if (!ret) {
 312                         if (!(cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 313                                 clear_bit(STATUS_POWER_PMI, &priv->status);
 314
 315                         if (priv->cfg->ops->lib->update_chain_flags &&
 316                             update_chains)
 317                                 priv->cfg->ops->lib->update_chain_flags(priv);
 318                         else if (priv->cfg->ops->lib->update_chain_flags)
 319                                 IWL_DEBUG_POWER(priv,
 320                                         "Cannot update the power, chain noise "
 321                                         "calibration running: %d\n",
 322                                         priv->chain_noise_data.state);
 323                         memcpy(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd));
 324                 } else
 325                         IWL_ERR(priv, "set power fail, ret = %d", ret);
 326         }
 327
 328         return ret;
 329 }
 330 EXPORT_SYMBOL(iwl_power_update_mode);
 331
 332 /* initialize to default */
 333 void iwl_power_initialize(struct iwl_priv *priv)
 334 {
 335         u16 lctl = iwl_pcie_link_ctl(priv);
 336
 337         priv->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
 338
 339         priv->power_data.debug_sleep_level_override = -1;
 340
 341         memset(&priv->power_data.sleep_cmd, 0,
 342                 sizeof(priv->power_data.sleep_cmd));
 343 }
 344 EXPORT_SYMBOL(iwl_power_initialize);