path: root/drivers/net/wireless/iwlwifi/iwl-power.c

/******************************************************************************
 *
 * Copyright(c) 2007 - 2009 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:
 *  Intel Linux Wireless <ilw@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/init.h>

#include <net/mac80211.h>

#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-commands.h"
#include "iwl-debug.h"
#include "iwl-power.h"

/*
 * Setting power level allows the card to go to sleep when not busy.
 *
 * We calculate a sleep command based on the required latency, which
 * we get from mac80211. In order to handle thermal throttling, we can
 * also use pre-defined power levels.
 */

/*
 * For now, keep using power level 1 instead of automatically
 * adjusting ...
 */
bool no_sleep_autoadjust = true;
module_param(no_sleep_autoadjust, bool, S_IRUGO);
MODULE_PARM_DESC(no_sleep_autoadjust,
		 "don't automatically adjust sleep level "
		 "according to maximum network latency");

/*
 * This defines the old power levels. They are still used by default
 * (level 1) and for thermal throttle (levels 3 through 5)
 */

struct iwl_power_vec_entry {
	struct iwl_powertable_cmd cmd;
	u8 no_dtim;	/* number of skip dtim */
};

#define IWL_DTIM_RANGE_0_MAX	2
#define IWL_DTIM_RANGE_1_MAX	10

#define NOSLP cpu_to_le16(0), 0, 0
#define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
#define TU_TO_USEC 1024
#define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
#define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
				     cpu_to_le32(X1), \
				     cpu_to_le32(X2), \
				     cpu_to_le32(X3), \
				     cpu_to_le32(X4)}
/* default power management (not Tx power) table values */
/* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
/* DTIM 0 - 2 */
static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 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 DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
/* DTIM 3 - 10 */
static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
	{{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, 6, 10, 10)}, 2}
};

/* for DTIM period > IWL_DTIM_RANGE_1_MAX */
/* DTIM 11 - */
static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
	{{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}
};

static void iwl_static_sleep_cmd(struct iwl_priv *priv,
				 struct iwl_powertable_cmd *cmd,
				 enum iwl_power_level lvl, int period)
{
	const struct iwl_power_vec_entry *table;
	int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
	int i;
	u8 skip;
	u32 slp_itrvl;

	table = range_2;
	if (period <= IWL_DTIM_RANGE_1_MAX)
		table = range_1;
	if (period <= IWL_DTIM_RANGE_0_MAX)
		table = range_0;