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

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/******************************************************************************
*
* Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
*
* Portions of this file are derived from the ipw3945 project, as well
* as portions of the ieee80211 subsystem header files.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* James P. Ketrenos <ipw2100-admin@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>
#include <net/mac80211.h>
#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-commands.h"
#include "iwl-debug.h"
#include "iwl-power.h"
#include "iwl-helpers.h"
/*
* Setting power level allow the card to go to sleep when not busy
* there are three factor that decide the power level to go to, they
* are list here with its priority
* 1- critical_power_setting this will be set according to card temperature.
* 2- system_power_setting this will be set by system PM manager.
* 3- user_power_setting this will be set by user either by writing to sys or
* mac80211
*
* if system_power_setting and user_power_setting is set to auto
* the power level will be decided according to association status and battery
* status.
*
*/
#define MSEC_TO_USEC 1024
#define IWL_POWER_RANGE_0_MAX (2)
#define IWL_POWER_RANGE_1_MAX (10)
#define NOSLP __constant_cpu_to_le16(0), 0, 0
#define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
#define SLP_TOUT(T) __constant_cpu_to_le32((T) * MSEC_TO_USEC)
#define SLP_VEC(X0, X1, X2, X3, X4) {__constant_cpu_to_le32(X0), \
__constant_cpu_to_le32(X1), \
__constant_cpu_to_le32(X2), \
__constant_cpu_to_le32(X3), \
__constant_cpu_to_le32(X4)}
#define IWL_POWER_ON_BATTERY IWL_POWER_INDEX_5
#define IWL_POWER_ON_AC_DISASSOC IWL_POWER_MODE_CAM
#define IWL_POWER_ON_AC_ASSOC IWL_POWER_MODE_CAM
#define IWL_CT_KILL_TEMPERATURE 110
#define IWL_MIN_POWER_TEMPERATURE 100
#define IWL_REDUCED_POWER_TEMPERATURE 95
/* default power management (not Tx power) table values */
/* for tim 0-10 */
static struct iwl_power_vec_entry range_0[IWL_POWER_AC] = {
{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
};
/* for tim = 3-10 */
static struct iwl_power_vec_entry range_1[IWL_POWER_AC] = {
{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
};
/* for tim > 11 */
static struct iwl_power_vec_entry range_2[IWL_POWER_AC] = {
{{NOSLP, SLP_TOUT(0), SLP_TOUT(0), SLP_VEC(0, 0, 0, 0, 0)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
};
/* decide the right power level according to association status
* and battery status
*/
static u16 iwl_get_auto_power_mode(struct iwl_priv *priv)
{
u16 mode = priv->power_data.user_power_setting;
switch (priv->power_data.user_power_setting) {
case IWL_POWER_AUTO:
/* if running on battery */
if (priv->power_data.is_battery_active)
mode = IWL_POWER_ON_BATTERY;
else if (iwl_is_associated(priv))
mode = IWL_POWER_ON_AC_ASSOC;
else
mode = IWL_POWER_ON_AC_DISASSOC;
break;
case IWL_POWER_BATTERY:
mode = IWL_POWER_INDEX_3;
break;
case IWL_POWER_AC:
mode = IWL_POWER_MODE_CAM;
break;
}
return mode;
}
/* initialize to default */
static int iwl_power_init_handle(struct iwl_priv *priv)
{
int ret = 0, i;
struct iwl_power_mgr *pow_data;
int size = sizeof(struct iwl_power_vec_entry) * IWL_POWER_AC;
u16 pci_pm;
IWL_DEBUG_POWER("Initialize power \n");
pow_data = &(priv->power_data);
memset(pow_data, 0, sizeof(*pow_data));
memcpy(&pow_data->pwr_range_0[0], &range_0[0], size);
memcpy(&pow_data->pwr_range_1[0], &range_1[0], size);
memcpy(&pow_data->pwr_range_2[0], &range_2[0], size);
ret = pci_read_config_word(priv->pci_dev,
PCI_LINK_CTRL, &pci_pm);
if (ret != 0)
return 0;
else {
struct iwl4965_powertable_cmd *cmd;
IWL_DEBUG_POWER("adjust power command flags\n");
for (i = 0; i < IWL_POWER_AC; i++) {
cmd = &pow_data->pwr_range_0[i].cmd;
if (pci_pm & 0x1)
cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
else
cmd->flags |= IWL_POWER_PCI_PM_MSK;
}
}
return ret;
}
/* adjust power command according to dtim period and power level*/
static int iwl_update_power_command(struct iwl_priv *priv,
struct iwl4965_powertable_cmd *cmd,
u16 mode)
{
int ret = 0, i;
u8 skip;
u32 max_sleep = 0;
struct iwl_power_vec_entry *range;
u8 period = 0;
struct iwl_power_mgr *pow_data;
if (mode > IWL_POWER_INDEX_5) {
IWL_DEBUG_POWER("Error invalid power mode \n");
return -1;
}
pow_data = &(priv->power_data);
if (pow_data->dtim_period <= IWL_POWER_RANGE_0_MAX)
range = &pow_data->pwr_range_0[0];
else if (pow_data->dtim_period <= IWL_POWER_RANGE_1_MAX)
range = &pow_data->pwr_range_1[0];
else
range = &pow_data->pwr_range_2[0];
period = pow_data->dtim_period;
memcpy(cmd, &range[mode].cmd, sizeof(struct iwl4965_powertable_cmd));
if (period == 0) {
period = 1;
skip = 0;
} else
skip = range[mode].no_dtim;
if (skip == 0) {
max_sleep = period;
cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
} else {
__le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
max_sleep = le32_to_cpu(slp_itrvl);
if (max_sleep == 0xFF)
max_sleep = period * (skip + 1);
else if (max_sleep > period)
max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
}
for (i = 0; i < IWL_POWER_VEC_SIZE; i++) {
if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
}
IWL_DEBUG_POWER("Flags value = 0x%08X\n", cmd->flags);
IWL_DEBUG_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
IWL_DEBUG_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
IWL_DEBUG_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
le32_to_cpu(cmd->sleep_interval[0]),
le32_to_cpu(cmd->sleep_interval[1]),
le32_to_cpu(cmd->sleep_interval[2]),
le32_to_cpu(cmd->sleep_interval[3]),
le32_to_cpu(cmd->sleep_interval[4]));
return ret;
}
/*
* calucaute the final power mode index
*/
int iwl_power_update_mode(struct iwl_priv *priv, u8 refresh)
{
struct iwl_power_mgr *setting = &(priv->power_data);
int ret = 0;
u16 uninitialized_var(final_mode);
/* If on battery, set to 3,
* if plugged into AC power, set to CAM ("continuously aware mode"),
* else user level */
switch (setting->system_power_setting) {
case IWL_POWER_AUTO:
final_mode = iwl_get_auto_power_mode(priv);
break;
case IWL_POWER_BATTERY:
final_mode = IWL_POWER_INDEX_3;
break;
case IWL_POWER_AC:
final_mode = IWL_POWER_MODE_CAM;
break;
default:
final_mode = setting->system_power_setting;
}
if (setting->critical_power_setting > final_mode)
final_mode = setting->critical_power_setting;
/* driver only support CAM for non STA network */
if (priv->iw_mode != IEEE80211_IF_TYPE_STA)
final_mode = IWL_POWER_MODE_CAM;
if (!iwl_is_rfkill(priv) && !setting->power_disabled &&
((setting->power_mode != final_mode) || refresh)) {
struct iwl4965_powertable_cmd cmd;
if (final_mode != IWL_POWER_MODE_CAM)
set_bit(STATUS_POWER_PMI, &priv->status);
iwl_update_power_command(priv, &cmd, final_mode);
cmd.keep_alive_beacons = 0;
if (final_mode == IWL_POWER_INDEX_5)
cmd.flags |= IWL_POWER_FAST_PD;
if (priv->cfg->ops->lib->set_power)
ret = priv->cfg->ops->lib->set_power(priv, &cmd);
if (final_mode == IWL_POWER_MODE_CAM)
clear_bit(STATUS_POWER_PMI, &priv->status);
else
set_bit(STATUS_POWER_PMI, &priv->status);
if (priv->cfg->ops->lib->update_chain_flags)
priv->cfg->ops->lib->update_chain_flags(priv);
if (!ret)
setting->power_mode = final_mode;
}
return ret;
}
EXPORT_SYMBOL(iwl_power_update_mode);
/* Allow other iwl code to disable/enable power management active
* this will be usefull for rate scale to disable PM during heavy
* Tx/Rx activities
*/
int iwl_power_disable_management(struct iwl_priv *priv)
{
u16 prev_mode;
int ret = 0;
if (priv->power_data.power_disabled)
return -EBUSY;
prev_mode = priv->power_data.user_power_setting;
priv->power_data.user_power_setting = IWL_POWER_MODE_CAM;
ret = iwl_power_update_mode(priv, 0);
priv->power_data.power_disabled = 1;
priv->power_data.user_power_setting = prev_mode;
return ret;
}
EXPORT_SYMBOL(iwl_power_disable_management);
/* Allow other iwl code to disable/enable power management active
* this will be usefull for rate scale to disable PM during hight
* valume activities
*/
int iwl_power_enable_management(struct iwl_priv *priv)
{
int ret = 0;
priv->power_data.power_disabled = 0;
ret = iwl_power_update_mode(priv, 0);
return ret;
}
EXPORT_SYMBOL(iwl_power_enable_management);
/* set user_power_setting */
int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode)
{
int ret = 0;
if (mode > IWL_POWER_LIMIT)
return -EINVAL;
priv->power_data.user_power_setting = mode;
ret = iwl_power_update_mode(priv, 0);
return ret;
}
EXPORT_SYMBOL(iwl_power_set_user_mode);
/* set system_power_setting. This should be set by over all
* PM application.
*/
int iwl_power_set_system_mode(struct iwl_priv *priv, u16 mode)
{
int ret = 0;
if (mode > IWL_POWER_LIMIT)
return -EINVAL;
priv->power_data.system_power_setting = mode;
ret = iwl_power_update_mode(priv, 0);
return ret;
}
EXPORT_SYMBOL(iwl_power_set_system_mode);
/* initilize to default */
void iwl_power_initialize(struct iwl_priv *priv)
{
iwl_power_init_handle(priv);
priv->power_data.user_power_setting = IWL_POWER_AUTO;
priv->power_data.power_disabled = 0;
priv->power_data.system_power_setting = IWL_POWER_AUTO;
priv->power_data.is_battery_active = 0;
priv->power_data.power_disabled = 0;
priv->power_data.critical_power_setting = 0;
}
EXPORT_SYMBOL(iwl_power_initialize);
/* set critical_power_setting according to temperature value */
int iwl_power_temperature_change(struct iwl_priv *priv)
{
int ret = 0;
u16 new_critical = priv->power_data.critical_power_setting;
s32 temperature = KELVIN_TO_CELSIUS(priv->last_temperature);
if (temperature > IWL_CT_KILL_TEMPERATURE)
return 0;
else if (temperature > IWL_MIN_POWER_TEMPERATURE)
new_critical = IWL_POWER_INDEX_5;
else if (temperature > IWL_REDUCED_POWER_TEMPERATURE)
new_critical = IWL_POWER_INDEX_3;
else
new_critical = IWL_POWER_MODE_CAM;
if (new_critical != priv->power_data.critical_power_setting)
priv->power_data.critical_power_setting = new_critical;
if (priv->power_data.critical_power_setting >
priv->power_data.power_mode)
ret = iwl_power_update_mode(priv, 0);
return ret;
}
EXPORT_SYMBOL(iwl_power_temperature_change);
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