2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3 * Copyright (c) 2002-2008 Atheros Communications, Inc.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 #include "ah_internal.h"
24 #include "ar5416/ar5416.h"
25 #include "ar5416/ar5416reg.h"
26 #include "ar5416/ar5416phy.h"
28 #define TU_TO_USEC(_tu) ((_tu) << 10)
29 #define ONE_EIGHTH_TU_TO_USEC(_tu8) ((_tu8) << 7)
32 * Return the hardware NextTBTT in TSF
35 ar5416GetNextTBTT(struct ath_hal *ah)
37 return OS_REG_READ(ah, AR_NEXT_TBTT);
41 * Initialize all of the hardware registers used to
42 * send beacons. Note that for station operation the
43 * driver calls ar5416SetStaBeaconTimers instead.
46 ar5416SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt)
49 struct ath_hal_5212 *ahp = AH5212(ah);
51 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bt->bt_nexttbtt));
52 OS_REG_WRITE(ah, AR_NEXT_DBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextdba));
53 OS_REG_WRITE(ah, AR_NEXT_SWBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextswba));
54 OS_REG_WRITE(ah, AR_NEXT_NDP, TU_TO_USEC(bt->bt_nextatim));
56 bperiod = TU_TO_USEC(bt->bt_intval & HAL_BEACON_PERIOD);
57 ahp->ah_beaconInterval = bt->bt_intval & HAL_BEACON_PERIOD;
58 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, bperiod);
59 OS_REG_WRITE(ah, AR_DBA_PERIOD, bperiod);
60 OS_REG_WRITE(ah, AR_SWBA_PERIOD, bperiod);
61 OS_REG_WRITE(ah, AR_NDP_PERIOD, bperiod);
64 * Reset TSF if required.
66 if (bt->bt_intval & AR_BEACON_RESET_TSF)
70 /* NB: flags == 0 handled specially for backwards compatibility */
71 OS_REG_SET_BIT(ah, AR_TIMER_MODE,
72 bt->bt_flags != 0 ? bt->bt_flags :
73 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_DBA | AR_TIMER_MODE_SWBA);
77 * Initializes all of the hardware registers used to
78 * send beacons. Note that for station operation the
79 * driver calls ar5212SetStaBeaconTimers instead.
82 ar5416BeaconInit(struct ath_hal *ah,
83 uint32_t next_beacon, uint32_t beacon_period)
87 bt.bt_nexttbtt = next_beacon;
89 * TIMER1: in AP/adhoc mode this controls the DMA beacon
90 * alert timer; otherwise it controls the next wakeup time.
91 * TIMER2: in AP mode, it controls the SBA beacon alert
92 * interrupt; otherwise it sets the start of the next CFP.
95 switch (AH_PRIVATE(ah)->ah_opmode) {
98 bt.bt_nextdba = 0xffff;
99 bt.bt_nextswba = 0x7ffff;
100 bt.bt_flags |= AR_TIMER_MODE_TBTT;
103 OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY);
104 bt.bt_flags |= AR_TIMER_MODE_NDP;
107 bt.bt_nextdba = (next_beacon -
108 ah->ah_config.ah_dma_beacon_response_time) << 3; /* 1/8 TU */
109 bt.bt_nextswba = (next_beacon -
110 ah->ah_config.ah_sw_beacon_response_time) << 3; /* 1/8 TU */
111 bt.bt_flags |= AR_TIMER_MODE_TBTT
113 | AR_TIMER_MODE_SWBA;
117 * Set the ATIM window
118 * Our hardware does not support an ATIM window of 0
119 * (beacons will not work). If the ATIM windows is 0,
122 bt.bt_nextatim = next_beacon + 1;
123 bt.bt_intval = beacon_period &
124 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN);
125 ar5416SetBeaconTimers(ah, &bt);
128 #define AR_BEACON_PERIOD_MAX 0xffff
131 ar5416ResetStaBeaconTimers(struct ath_hal *ah)
135 OS_REG_WRITE(ah, AR_NEXT_TBTT, 0); /* no beacons */
136 val = OS_REG_READ(ah, AR_STA_ID1);
137 val |= AR_STA_ID1_PWR_SAV; /* XXX */
138 /* tell the h/w that the associated AP is not PCF capable */
139 OS_REG_WRITE(ah, AR_STA_ID1,
140 val & ~(AR_STA_ID1_USE_DEFANT | AR_STA_ID1_PCF));
141 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, AR_BEACON_PERIOD_MAX);
142 OS_REG_WRITE(ah, AR_DBA_PERIOD, AR_BEACON_PERIOD_MAX);
146 * Set all the beacon related bits on the h/w for stations
147 * i.e. initializes the corresponding h/w timers;
148 * also tells the h/w whether to anticipate PCF beacons
151 ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs)
153 uint32_t nextTbtt, nextdtim,beaconintval, dtimperiod;
155 HALASSERT(bs->bs_intval != 0);
157 /* NB: no cfp setting since h/w automatically takes care */
159 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bs->bs_nexttbtt));
162 * Start the beacon timers by setting the BEACON register
163 * to the beacon interval; no need to write tim offset since
166 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD,
167 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
168 OS_REG_WRITE(ah, AR_DBA_PERIOD,
169 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
172 * Configure the BMISS interrupt. Note that we
173 * assume the caller blocks interrupts while enabling
176 HALASSERT(bs->bs_bmissthreshold <=
177 (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S));
178 OS_REG_RMW_FIELD(ah, AR_RSSI_THR,
179 AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold);
182 * Program the sleep registers to correlate with the beacon setup.
186 * Oahu beacons timers on the station were used for power
187 * save operation (waking up in anticipation of a beacon)
188 * and any CFP function; Venice does sleep/power-save timers
189 * differently - so this is the right place to set them up;
190 * don't think the beacon timers are used by venice sta hw
191 * for any useful purpose anymore
192 * Setup venice's sleep related timers
193 * Current implementation assumes sw processing of beacons -
194 * assuming an interrupt is generated every beacon which
195 * causes the hardware to become awake until the sw tells
196 * it to go to sleep again; beacon timeout is to allow for
197 * beacon jitter; cab timeout is max time to wait for cab
198 * after seeing the last DTIM or MORE CAB bit
200 #define CAB_TIMEOUT_VAL 10 /* in TU */
201 #define BEACON_TIMEOUT_VAL 10 /* in TU */
202 #define SLEEP_SLOP 3 /* in TU */
205 * For max powersave mode we may want to sleep for longer than a
206 * beacon period and not want to receive all beacons; modify the
207 * timers accordingly; make sure to align the next TIM to the
208 * next DTIM if we decide to wake for DTIMs only
210 beaconintval = bs->bs_intval & HAL_BEACON_PERIOD;
211 HALASSERT(beaconintval != 0);
212 if (bs->bs_sleepduration > beaconintval) {
213 HALASSERT(roundup(bs->bs_sleepduration, beaconintval) ==
214 bs->bs_sleepduration);
215 beaconintval = bs->bs_sleepduration;
217 dtimperiod = bs->bs_dtimperiod;
218 if (bs->bs_sleepduration > dtimperiod) {
219 HALASSERT(dtimperiod == 0 ||
220 roundup(bs->bs_sleepduration, dtimperiod) ==
221 bs->bs_sleepduration);
222 dtimperiod = bs->bs_sleepduration;
224 HALASSERT(beaconintval <= dtimperiod);
225 if (beaconintval == dtimperiod)
226 nextTbtt = bs->bs_nextdtim;
228 nextTbtt = bs->bs_nexttbtt;
229 nextdtim = bs->bs_nextdtim;
231 OS_REG_WRITE(ah, AR_NEXT_DTIM,
232 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP));
233 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP));
235 /* cab timeout is now in 1/8 TU */
236 OS_REG_WRITE(ah, AR5416_SLEEP1,
237 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT)
238 | AR5416_SLEEP1_ASSUME_DTIM);
240 /* XXX autosleep? Use min beacon timeout; check ath9k -adrian */
241 /* beacon timeout is now in 1/8 TU */
242 OS_REG_WRITE(ah, AR5416_SLEEP2,
243 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT));
245 /* TIM_PERIOD and DTIM_PERIOD are now in uS. */
246 OS_REG_WRITE(ah, AR_TIM_PERIOD, TU_TO_USEC(beaconintval));
247 OS_REG_WRITE(ah, AR_DTIM_PERIOD, TU_TO_USEC(dtimperiod));
249 OS_REG_SET_BIT(ah, AR_TIMER_MODE,
250 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM);
251 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n",
252 __func__, bs->bs_nextdtim);
253 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n",
255 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n",
256 __func__, beaconintval);
257 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n",
258 __func__, dtimperiod);
259 #undef CAB_TIMEOUT_VAL
260 #undef BEACON_TIMEOUT_VAL