mirror of https://github.com/proski/madwifi
246 lines
7.9 KiB
C
246 lines
7.9 KiB
C
/*
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* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
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* Copyright (c) 2002-2008 Atheros Communications, Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* $Id: ar5416_beacon.c,v 1.8 2008/11/11 01:03:12 sam Exp $
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*/
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#include "opt_ah.h"
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#include "ah.h"
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#include "ah_internal.h"
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#include "ar5416/ar5416.h"
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#include "ar5416/ar5416reg.h"
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#include "ar5416/ar5416phy.h"
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#define TU_TO_USEC(_tu) ((_tu) << 10)
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/*
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* Initialize all of the hardware registers used to
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* send beacons. Note that for station operation the
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* driver calls ar5416SetStaBeaconTimers instead.
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*/
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void
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ar5416SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt)
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{
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uint32_t bperiod;
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OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bt->bt_nexttbtt));
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OS_REG_WRITE(ah, AR_NEXT_DBA, TU_TO_USEC(bt->bt_nextdba) >> 3);
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OS_REG_WRITE(ah, AR_NEXT_SWBA, TU_TO_USEC(bt->bt_nextswba) >> 3);
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OS_REG_WRITE(ah, AR_NEXT_NDP, TU_TO_USEC(bt->bt_nextatim));
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bperiod = TU_TO_USEC(bt->bt_intval & HAL_BEACON_PERIOD);
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OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, bperiod);
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OS_REG_WRITE(ah, AR_DBA_PERIOD, bperiod);
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OS_REG_WRITE(ah, AR_SWBA_PERIOD, bperiod);
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OS_REG_WRITE(ah, AR_NDP_PERIOD, bperiod);
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/*
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* Reset TSF if required.
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*/
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if (bt->bt_intval & AR_BEACON_RESET_TSF)
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ar5416ResetTsf(ah);
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/* enable timers */
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/* NB: flags == 0 handled specially for backwards compatibility */
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OS_REG_SET_BIT(ah, AR_TIMER_MODE,
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bt->bt_flags != 0 ? bt->bt_flags :
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AR_TIMER_MODE_TBTT | AR_TIMER_MODE_DBA | AR_TIMER_MODE_SWBA);
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}
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/*
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* Initializes all of the hardware registers used to
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* send beacons. Note that for station operation the
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* driver calls ar5212SetStaBeaconTimers instead.
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*/
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void
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ar5416BeaconInit(struct ath_hal *ah,
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uint32_t next_beacon, uint32_t beacon_period)
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{
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HAL_BEACON_TIMERS bt;
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bt.bt_nexttbtt = next_beacon;
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/*
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* TIMER1: in AP/adhoc mode this controls the DMA beacon
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* alert timer; otherwise it controls the next wakeup time.
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* TIMER2: in AP mode, it controls the SBA beacon alert
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* interrupt; otherwise it sets the start of the next CFP.
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*/
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bt.bt_flags = 0;
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switch (AH_PRIVATE(ah)->ah_opmode) {
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case HAL_M_STA:
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case HAL_M_MONITOR:
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bt.bt_nextdba = 0xffff;
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bt.bt_nextswba = 0x7ffff;
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bt.bt_flags |= AR_TIMER_MODE_TBTT;
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break;
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case HAL_M_IBSS:
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OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY);
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bt.bt_flags |= AR_TIMER_MODE_NDP;
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/* fall thru... */
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case HAL_M_HOSTAP:
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bt.bt_nextdba = (next_beacon -
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ath_hal_dma_beacon_response_time) << 3; /* 1/8 TU */
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bt.bt_nextswba = (next_beacon -
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ath_hal_sw_beacon_response_time) << 3; /* 1/8 TU */
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bt.bt_flags |= AR_TIMER_MODE_TBTT
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| AR_TIMER_MODE_DBA
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| AR_TIMER_MODE_SWBA;
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break;
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}
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/*
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* Set the ATIM window
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* Our hardware does not support an ATIM window of 0
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* (beacons will not work). If the ATIM windows is 0,
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* force it to 1.
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*/
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bt.bt_nextatim = next_beacon + 1;
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bt.bt_intval = beacon_period &
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(AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN);
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ar5416SetBeaconTimers(ah, &bt);
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}
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#define AR_BEACON_PERIOD_MAX 0xffff
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void
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ar5416ResetStaBeaconTimers(struct ath_hal *ah)
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{
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uint32_t val;
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OS_REG_WRITE(ah, AR_NEXT_TBTT, 0); /* no beacons */
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val = OS_REG_READ(ah, AR_STA_ID1);
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val |= AR_STA_ID1_PWR_SAV; /* XXX */
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/* tell the h/w that the associated AP is not PCF capable */
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OS_REG_WRITE(ah, AR_STA_ID1,
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val & ~(AR_STA_ID1_USE_DEFANT | AR_STA_ID1_PCF));
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OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, AR_BEACON_PERIOD_MAX);
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OS_REG_WRITE(ah, AR_DBA_PERIOD, AR_BEACON_PERIOD_MAX);
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}
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/*
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* Set all the beacon related bits on the h/w for stations
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* i.e. initializes the corresponding h/w timers;
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* also tells the h/w whether to anticipate PCF beacons
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*/
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void
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ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs)
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{
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uint32_t nextTbtt, beaconintval, dtimperiod;
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HALASSERT(bs->bs_intval != 0);
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/* NB: no cfp setting since h/w automatically takes care */
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OS_REG_WRITE(ah, AR_NEXT_TBTT, bs->bs_nexttbtt);
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/*
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* Start the beacon timers by setting the BEACON register
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* to the beacon interval; no need to write tim offset since
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* h/w parses IEs.
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*/
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OS_REG_WRITE(ah, AR5416_BEACON_PERIOD,
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TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
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OS_REG_WRITE(ah, AR_DBA_PERIOD,
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TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
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/*
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* Configure the BMISS interrupt. Note that we
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* assume the caller blocks interrupts while enabling
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* the threshold.
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*/
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HALASSERT(bs->bs_bmissthreshold <=
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(AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S));
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OS_REG_RMW_FIELD(ah, AR_RSSI_THR,
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AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold);
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/*
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* Program the sleep registers to correlate with the beacon setup.
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*/
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/*
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* Oahu beacons timers on the station were used for power
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* save operation (waking up in anticipation of a beacon)
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* and any CFP function; Venice does sleep/power-save timers
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* differently - so this is the right place to set them up;
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* don't think the beacon timers are used by venice sta hw
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* for any useful purpose anymore
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* Setup venice's sleep related timers
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* Current implementation assumes sw processing of beacons -
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* assuming an interrupt is generated every beacon which
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* causes the hardware to become awake until the sw tells
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* it to go to sleep again; beacon timeout is to allow for
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* beacon jitter; cab timeout is max time to wait for cab
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* after seeing the last DTIM or MORE CAB bit
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*/
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#define CAB_TIMEOUT_VAL 10 /* in TU */
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#define BEACON_TIMEOUT_VAL 10 /* in TU */
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#define SLEEP_SLOP 3 /* in TU */
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/*
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* For max powersave mode we may want to sleep for longer than a
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* beacon period and not want to receive all beacons; modify the
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* timers accordingly; make sure to align the next TIM to the
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* next DTIM if we decide to wake for DTIMs only
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*/
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beaconintval = bs->bs_intval & HAL_BEACON_PERIOD;
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HALASSERT(beaconintval != 0);
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if (bs->bs_sleepduration > beaconintval) {
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HALASSERT(roundup(bs->bs_sleepduration, beaconintval) ==
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bs->bs_sleepduration);
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beaconintval = bs->bs_sleepduration;
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}
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dtimperiod = bs->bs_dtimperiod;
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if (bs->bs_sleepduration > dtimperiod) {
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HALASSERT(dtimperiod == 0 ||
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roundup(bs->bs_sleepduration, dtimperiod) ==
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bs->bs_sleepduration);
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dtimperiod = bs->bs_sleepduration;
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}
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HALASSERT(beaconintval <= dtimperiod);
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if (beaconintval == dtimperiod)
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nextTbtt = bs->bs_nextdtim;
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else
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nextTbtt = bs->bs_nexttbtt;
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OS_REG_WRITE(ah, AR_NEXT_DTIM,
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TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP));
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OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP));
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/* cab timeout is now in 1/8 TU */
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OS_REG_WRITE(ah, AR_SLEEP1,
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SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT)
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| AR_SLEEP1_ASSUME_DTIM);
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/* beacon timeout is now in 1/8 TU */
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OS_REG_WRITE(ah, AR_SLEEP2,
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SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT));
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OS_REG_WRITE(ah, AR_TIM_PERIOD, beaconintval);
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OS_REG_WRITE(ah, AR_DTIM_PERIOD, dtimperiod);
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OS_REG_SET_BIT(ah, AR_TIMER_MODE,
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AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM);
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HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n",
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__func__, bs->bs_nextdtim);
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HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n",
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__func__, nextTbtt);
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HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n",
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__func__, beaconintval);
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HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n",
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__func__, dtimperiod);
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#undef CAB_TIMEOUT_VAL
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#undef BEACON_TIMEOUT_VAL
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#undef SLEEP_SLOP
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}
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