iwlwifi: Add power level support

Add power level support

Signed-off-by: Mohamed Abbas <mabbas@linux.intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 423 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-power.c b/drivers/net/wireless/iwlwifi/iwl-power.c
new file mode 100644
index 0000000..a242628
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-power.c
@@ -0,0 +1,423 @@
+/******************************************************************************
+ *
+ * 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-4965.h"
+#include "iwl-core.h"
+#include "iwl-4965-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);