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 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 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 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 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 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