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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2011 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  * This defines the old power levels. They are still used by default
  55  * (level 1) and for thermal throttle (levels 3 through 5)
  56  */
  57
  58 struct il_power_vec_entry {
  59         struct il_powertable_cmd cmd;
  60         u8 no_dtim;     /* number of skip dtim */
  61 };
  62
  63 static void il_power_sleep_cam_cmd(struct il_priv *il,
  64                                     struct il_powertable_cmd *cmd)
  65 {
  66         memset(cmd, 0, sizeof(*cmd));
  67
  68         if (il->power_data.pci_pm)
  69                 cmd->flags |= IL_POWER_PCI_PM_MSK;
  70
  71         IL_DEBUG_POWER(il, "Sleep command for CAM\n");
  72 }
  73
  74 static int
  75 il_set_power(struct il_priv *il, struct il_powertable_cmd *cmd)
  76 {
  77         IL_DEBUG_POWER(il, "Sending power/sleep command\n");
  78         IL_DEBUG_POWER(il, "Flags value = 0x%08X\n", cmd->flags);
  79         IL_DEBUG_POWER(il, "Tx timeout = %u\n",
  80                                         le32_to_cpu(cmd->tx_data_timeout));
  81         IL_DEBUG_POWER(il, "Rx timeout = %u\n",
  82                                         le32_to_cpu(cmd->rx_data_timeout));
  83         IL_DEBUG_POWER(il,
  84                         "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
  85                         le32_to_cpu(cmd->sleep_interval[0]),
  86                         le32_to_cpu(cmd->sleep_interval[1]),
  87                         le32_to_cpu(cmd->sleep_interval[2]),
  88                         le32_to_cpu(cmd->sleep_interval[3]),
  89                         le32_to_cpu(cmd->sleep_interval[4]));
  90
  91         return il_send_cmd_pdu(il, POWER_TABLE_CMD,
  92                                 sizeof(struct il_powertable_cmd), cmd);
  93 }
  94
  95 int
  96 il_power_set_mode(struct il_priv *il, struct il_powertable_cmd *cmd,
  97                        bool force)
  98 {
  99         int ret;
 100         bool update_chains;
 101
 102         lockdep_assert_held(&il->mutex);
 103
 104         /* Don't update the RX chain when chain noise calibration is running */
 105         update_chains = il->chain_noise_data.state == IL_CHAIN_NOISE_DONE ||
 106                         il->chain_noise_data.state == IL_CHAIN_NOISE_ALIVE;
 107
 108         if (!memcmp(&il->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 109                 return 0;
 110
 111         if (!il_is_ready_rf(il))
 112                 return -EIO;
 113
 114         /* scan complete use sleep_power_next, need to be updated */
 115         memcpy(&il->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 116         if (test_bit(STATUS_SCANNING, &il->status) && !force) {
 117                 IL_DEBUG_INFO(il, "Defer power set mode while scanning\n");
 118                 return 0;
 119         }
 120
 121         if (cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 122                 set_bit(STATUS_POWER_PMI, &il->status);
 123
 124         ret = il_set_power(il, cmd);
 125         if (!ret) {
 126                 if (!(cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 127                         clear_bit(STATUS_POWER_PMI, &il->status);
 128
 129                 if (il->cfg->ops->lib->update_chain_flags && update_chains)
 130                         il->cfg->ops->lib->update_chain_flags(il);
 131                 else if (il->cfg->ops->lib->update_chain_flags)
 132                         IL_DEBUG_POWER(il,
 133                                         "Cannot update the power, chain noise "
 134                                         "calibration running: %d\n",
 135                                         il->chain_noise_data.state);
 136
 137                 memcpy(&il->power_data.sleep_cmd, cmd, sizeof(*cmd));
 138         } else
 139                 IL_ERR(il, "set power fail, ret = %d", ret);
 140
 141         return ret;
 142 }
 143
 144 int il_power_update_mode(struct il_priv *il, bool force)
 145 {
 146         struct il_powertable_cmd cmd;
 147
 148         il_power_sleep_cam_cmd(il, &cmd);
 149         return il_power_set_mode(il, &cmd, force);
 150 }
 151 EXPORT_SYMBOL(il_power_update_mode);
 152
 153 /* initialize to default */
 154 void il_power_initialize(struct il_priv *il)
 155 {
 156         u16 lctl = il_pcie_link_ctl(il);
 157
 158         il->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
 159
 160         il->power_data.debug_sleep_level_override = -1;
 161
 162         memset(&il->power_data.sleep_cmd, 0,
 163                 sizeof(il->power_data.sleep_cmd));
 164 }
 165 EXPORT_SYMBOL(il_power_initialize);