1 /*
2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
3 * Copyright (c) 2002-2008 Atheros Communications, Inc.
4 *
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.
8 *
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.
16 *
17 * $FreeBSD$
18 */
19 #include "opt_ah.h"
20
21 #include "ah.h"
22 #include "ah_internal.h"
23
24 #include "ar5416/ar5416.h"
25 #include "ar5416/ar5416reg.h"
26 #include "ar5416/ar5416phy.h"
27
28 #define TU_TO_USEC(_tu) ((_tu) << 10)
29 #define ONE_EIGHTH_TU_TO_USEC(_tu8) ((_tu8) << 7)
30
31 /*
32 * Return the hardware NextTBTT in TSF
33 */
34 uint64_t
ar5416GetNextTBTT(struct ath_hal * ah)35 ar5416GetNextTBTT(struct ath_hal *ah)
36 {
37 return OS_REG_READ(ah, AR_NEXT_TBTT);
38 }
39
40 /*
41 * Initialize all of the hardware registers used to
42 * send beacons. Note that for station operation the
43 * driver calls ar5416SetStaBeaconTimers instead.
44 */
45 void
ar5416SetBeaconTimers(struct ath_hal * ah,const HAL_BEACON_TIMERS * bt)46 ar5416SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt)
47 {
48 uint32_t bperiod;
49 struct ath_hal_5212 *ahp = AH5212(ah);
50
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));
55
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);
62
63 /*
64 * Reset TSF if required.
65 */
66 if (bt->bt_intval & AR_BEACON_RESET_TSF)
67 ar5416ResetTsf(ah);
68
69 /* enable timers */
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);
74 }
75
76 /*
77 * Initializes all of the hardware registers used to
78 * send beacons. Note that for station operation the
79 * driver calls ar5212SetStaBeaconTimers instead.
80 */
81 void
ar5416BeaconInit(struct ath_hal * ah,uint32_t next_beacon,uint32_t beacon_period)82 ar5416BeaconInit(struct ath_hal *ah,
83 uint32_t next_beacon, uint32_t beacon_period)
84 {
85 HAL_BEACON_TIMERS bt;
86
87 bzero(&bt, sizeof(bt)); /* avoid gcc warnings */
88 bt.bt_nexttbtt = next_beacon;
89 /*
90 * TIMER1: in AP/adhoc mode this controls the DMA beacon
91 * alert timer; otherwise it controls the next wakeup time.
92 * TIMER2: in AP mode, it controls the SBA beacon alert
93 * interrupt; otherwise it sets the start of the next CFP.
94 */
95 bt.bt_flags = 0;
96 switch (AH_PRIVATE(ah)->ah_opmode) {
97 case HAL_M_STA:
98 case HAL_M_MONITOR:
99 bt.bt_nextdba = 0xffff;
100 bt.bt_nextswba = 0x7ffff;
101 bt.bt_flags |= AR_TIMER_MODE_TBTT;
102 break;
103 case HAL_M_IBSS:
104 OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY);
105 bt.bt_flags |= AR_TIMER_MODE_NDP;
106 /* fall thru... */
107 case HAL_M_HOSTAP:
108 bt.bt_nextdba = (next_beacon -
109 ah->ah_config.ah_dma_beacon_response_time) << 3; /* 1/8 TU */
110 bt.bt_nextswba = (next_beacon -
111 ah->ah_config.ah_sw_beacon_response_time) << 3; /* 1/8 TU */
112 bt.bt_flags |= AR_TIMER_MODE_TBTT
113 | AR_TIMER_MODE_DBA
114 | AR_TIMER_MODE_SWBA;
115 break;
116 }
117 /*
118 * Set the ATIM window
119 * Our hardware does not support an ATIM window of 0
120 * (beacons will not work). If the ATIM windows is 0,
121 * force it to 1.
122 */
123 bt.bt_nextatim = next_beacon + 1;
124 bt.bt_intval = beacon_period &
125 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN);
126 ar5416SetBeaconTimers(ah, &bt);
127 }
128
129 #define AR_BEACON_PERIOD_MAX 0xffff
130
131 void
ar5416ResetStaBeaconTimers(struct ath_hal * ah)132 ar5416ResetStaBeaconTimers(struct ath_hal *ah)
133 {
134 uint32_t val;
135
136 OS_REG_WRITE(ah, AR_NEXT_TBTT, 0); /* no beacons */
137 val = OS_REG_READ(ah, AR_STA_ID1);
138 val |= AR_STA_ID1_PWR_SAV; /* XXX */
139 /* tell the h/w that the associated AP is not PCF capable */
140 OS_REG_WRITE(ah, AR_STA_ID1,
141 val & ~(AR_STA_ID1_USE_DEFANT | AR_STA_ID1_PCF));
142 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, AR_BEACON_PERIOD_MAX);
143 OS_REG_WRITE(ah, AR_DBA_PERIOD, AR_BEACON_PERIOD_MAX);
144 }
145
146 /*
147 * Set all the beacon related bits on the h/w for stations
148 * i.e. initializes the corresponding h/w timers;
149 * also tells the h/w whether to anticipate PCF beacons
150 */
151 void
ar5416SetStaBeaconTimers(struct ath_hal * ah,const HAL_BEACON_STATE * bs)152 ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs)
153 {
154 uint32_t nextTbtt, nextdtim,beaconintval, dtimperiod;
155
156 HALASSERT(bs->bs_intval != 0);
157
158 /* NB: no cfp setting since h/w automatically takes care */
159
160 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bs->bs_nexttbtt));
161
162 /*
163 * Start the beacon timers by setting the BEACON register
164 * to the beacon interval; no need to write tim offset since
165 * h/w parses IEs.
166 */
167 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD,
168 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
169 OS_REG_WRITE(ah, AR_DBA_PERIOD,
170 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD));
171
172 /*
173 * Configure the BMISS interrupt. Note that we
174 * assume the caller blocks interrupts while enabling
175 * the threshold.
176 */
177 HALASSERT(bs->bs_bmissthreshold <=
178 (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S));
179 OS_REG_RMW_FIELD(ah, AR_RSSI_THR,
180 AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold);
181
182 /*
183 * Program the sleep registers to correlate with the beacon setup.
184 */
185
186 /*
187 * Oahu beacons timers on the station were used for power
188 * save operation (waking up in anticipation of a beacon)
189 * and any CFP function; Venice does sleep/power-save timers
190 * differently - so this is the right place to set them up;
191 * don't think the beacon timers are used by venice sta hw
192 * for any useful purpose anymore
193 * Setup venice's sleep related timers
194 * Current implementation assumes sw processing of beacons -
195 * assuming an interrupt is generated every beacon which
196 * causes the hardware to become awake until the sw tells
197 * it to go to sleep again; beacon timeout is to allow for
198 * beacon jitter; cab timeout is max time to wait for cab
199 * after seeing the last DTIM or MORE CAB bit
200 */
201
202 /*
203 * I've bumped these to 30TU for now.
204 *
205 * Some APs (AR933x/AR934x?) in 2GHz especially seem to not always
206 * transmit beacon frames at exactly the right times and with it set
207 * to 10TU, the NIC starts not waking up at the right times to hear
208 * these slightly-larger-jitering beacons. It also never recovers
209 * from that (it doesn't resync? I'm not sure.)
210 *
211 * So for now bump this to 30TU. Ideally we'd cap this based on
212 * the beacon interval so the sum of CAB+BEACON timeouts never
213 * exceeded the beacon interval.
214 *
215 * Now, since we're doing all the math in the ath(4) driver in TU
216 * rather than TSF, we may be seeing the result of dumb rounding
217 * errors causing the jitter to actually be a much bigger problem.
218 * I'll have to investigate that with a fine tooth comb.
219 */
220 #define CAB_TIMEOUT_VAL 10 /* in TU */
221 #define BEACON_TIMEOUT_VAL 10 /* in TU */
222 #define SLEEP_SLOP 3 /* in TU */
223
224 /*
225 * For max powersave mode we may want to sleep for longer than a
226 * beacon period and not want to receive all beacons; modify the
227 * timers accordingly; make sure to align the next TIM to the
228 * next DTIM if we decide to wake for DTIMs only
229 */
230 beaconintval = bs->bs_intval & HAL_BEACON_PERIOD;
231 HALASSERT(beaconintval != 0);
232 if (bs->bs_sleepduration > beaconintval) {
233 HALASSERT(roundup(bs->bs_sleepduration, beaconintval) ==
234 bs->bs_sleepduration);
235 beaconintval = bs->bs_sleepduration;
236 }
237 dtimperiod = bs->bs_dtimperiod;
238 if (bs->bs_sleepduration > dtimperiod) {
239 HALASSERT(dtimperiod == 0 ||
240 roundup(bs->bs_sleepduration, dtimperiod) ==
241 bs->bs_sleepduration);
242 dtimperiod = bs->bs_sleepduration;
243 }
244 HALASSERT(beaconintval <= dtimperiod);
245 if (beaconintval == dtimperiod)
246 nextTbtt = bs->bs_nextdtim;
247 else
248 nextTbtt = bs->bs_nexttbtt;
249 nextdtim = bs->bs_nextdtim;
250
251 OS_REG_WRITE(ah, AR_NEXT_DTIM,
252 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP));
253 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP));
254
255 /* cab timeout is now in 1/8 TU */
256 OS_REG_WRITE(ah, AR5416_SLEEP1,
257 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT)
258 | AR5416_SLEEP1_ASSUME_DTIM);
259
260 /* XXX autosleep? Use min beacon timeout; check ath9k -adrian */
261 /* beacon timeout is now in 1/8 TU */
262 OS_REG_WRITE(ah, AR5416_SLEEP2,
263 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT));
264
265 /* TIM_PERIOD and DTIM_PERIOD are now in uS. */
266 OS_REG_WRITE(ah, AR_TIM_PERIOD, TU_TO_USEC(beaconintval));
267 OS_REG_WRITE(ah, AR_DTIM_PERIOD, TU_TO_USEC(dtimperiod));
268
269 OS_REG_SET_BIT(ah, AR_TIMER_MODE,
270 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM);
271
272 #define HAL_TSFOOR_THRESHOLD 0x00004240 /* TSF OOR threshold (16k us) */
273
274 /* TSF out of range threshold */
275 // OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, bs->bs_tsfoor_threshold);
276 OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, HAL_TSFOOR_THRESHOLD);
277
278 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n",
279 __func__, bs->bs_nextdtim);
280 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n",
281 __func__, nextTbtt);
282 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n",
283 __func__, beaconintval);
284 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n",
285 __func__, dtimperiod);
286 #undef CAB_TIMEOUT_VAL
287 #undef BEACON_TIMEOUT_VAL
288 #undef SLEEP_SLOP
289 }
290