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 bt.bt_nexttbtt = next_beacon; 88 /* 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. 93 */ 94 bt.bt_flags = 0; 95 switch (AH_PRIVATE(ah)->ah_opmode) { 96 case HAL_M_STA: 97 case HAL_M_MONITOR: 98 bt.bt_nextdba = 0xffff; 99 bt.bt_nextswba = 0x7ffff; 100 bt.bt_flags |= AR_TIMER_MODE_TBTT; 101 break; 102 case HAL_M_IBSS: 103 OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY); 104 bt.bt_flags |= AR_TIMER_MODE_NDP; 105 /* fall thru... */ 106 case HAL_M_HOSTAP: 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 112 | AR_TIMER_MODE_DBA 113 | AR_TIMER_MODE_SWBA; 114 break; 115 } 116 /* 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, 120 * force it to 1. 121 */ 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); 126 } 127 128 #define AR_BEACON_PERIOD_MAX 0xffff 129 130 void 131 ar5416ResetStaBeaconTimers(struct ath_hal *ah) 132 { 133 uint32_t val; 134 135 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); 143 } 144 145 /* 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 149 */ 150 void 151 ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs) 152 { 153 uint32_t nextTbtt, nextdtim,beaconintval, dtimperiod; 154 155 HALASSERT(bs->bs_intval != 0); 156 157 /* NB: no cfp setting since h/w automatically takes care */ 158 159 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bs->bs_nexttbtt)); 160 161 /* 162 * Start the beacon timers by setting the BEACON register 163 * to the beacon interval; no need to write tim offset since 164 * h/w parses IEs. 165 */ 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)); 170 171 /* 172 * Configure the BMISS interrupt. Note that we 173 * assume the caller blocks interrupts while enabling 174 * the threshold. 175 */ 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); 180 181 /* 182 * Program the sleep registers to correlate with the beacon setup. 183 */ 184 185 /* 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 199 */ 200 201 /* 202 * I've bumped these to 30TU for now. 203 * 204 * Some APs (AR933x/AR934x?) in 2GHz especially seem to not always 205 * transmit beacon frames at exactly the right times and with it set 206 * to 10TU, the NIC starts not waking up at the right times to hear 207 * these slightly-larger-jitering beacons. It also never recovers 208 * from that (it doesn't resync? I'm not sure.) 209 * 210 * So for now bump this to 30TU. Ideally we'd cap this based on 211 * the beacon interval so the sum of CAB+BEACON timeouts never 212 * exceeded the beacon interval. 213 * 214 * Now, since we're doing all the math in the ath(4) driver in TU 215 * rather than TSF, we may be seeing the result of dumb rounding 216 * errors causing the jitter to actually be a much bigger problem. 217 * I'll have to investigate that with a fine tooth comb. 218 */ 219 #define CAB_TIMEOUT_VAL 10 /* in TU */ 220 #define BEACON_TIMEOUT_VAL 10 /* in TU */ 221 #define SLEEP_SLOP 3 /* in TU */ 222 223 /* 224 * For max powersave mode we may want to sleep for longer than a 225 * beacon period and not want to receive all beacons; modify the 226 * timers accordingly; make sure to align the next TIM to the 227 * next DTIM if we decide to wake for DTIMs only 228 */ 229 beaconintval = bs->bs_intval & HAL_BEACON_PERIOD; 230 HALASSERT(beaconintval != 0); 231 if (bs->bs_sleepduration > beaconintval) { 232 HALASSERT(roundup(bs->bs_sleepduration, beaconintval) == 233 bs->bs_sleepduration); 234 beaconintval = bs->bs_sleepduration; 235 } 236 dtimperiod = bs->bs_dtimperiod; 237 if (bs->bs_sleepduration > dtimperiod) { 238 HALASSERT(dtimperiod == 0 || 239 roundup(bs->bs_sleepduration, dtimperiod) == 240 bs->bs_sleepduration); 241 dtimperiod = bs->bs_sleepduration; 242 } 243 HALASSERT(beaconintval <= dtimperiod); 244 if (beaconintval == dtimperiod) 245 nextTbtt = bs->bs_nextdtim; 246 else 247 nextTbtt = bs->bs_nexttbtt; 248 nextdtim = bs->bs_nextdtim; 249 250 OS_REG_WRITE(ah, AR_NEXT_DTIM, 251 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP)); 252 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP)); 253 254 /* cab timeout is now in 1/8 TU */ 255 OS_REG_WRITE(ah, AR5416_SLEEP1, 256 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT) 257 | AR5416_SLEEP1_ASSUME_DTIM); 258 259 /* XXX autosleep? Use min beacon timeout; check ath9k -adrian */ 260 /* beacon timeout is now in 1/8 TU */ 261 OS_REG_WRITE(ah, AR5416_SLEEP2, 262 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT)); 263 264 /* TIM_PERIOD and DTIM_PERIOD are now in uS. */ 265 OS_REG_WRITE(ah, AR_TIM_PERIOD, TU_TO_USEC(beaconintval)); 266 OS_REG_WRITE(ah, AR_DTIM_PERIOD, TU_TO_USEC(dtimperiod)); 267 268 OS_REG_SET_BIT(ah, AR_TIMER_MODE, 269 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM); 270 271 #define HAL_TSFOOR_THRESHOLD 0x00004240 /* TSF OOR threshold (16k us) */ 272 273 /* TSF out of range threshold */ 274 // OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, bs->bs_tsfoor_threshold); 275 OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, HAL_TSFOOR_THRESHOLD); 276 277 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n", 278 __func__, bs->bs_nextdtim); 279 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n", 280 __func__, nextTbtt); 281 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n", 282 __func__, beaconintval); 283 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n", 284 __func__, dtimperiod); 285 #undef CAB_TIMEOUT_VAL 286 #undef BEACON_TIMEOUT_VAL 287 #undef SLEEP_SLOP 288 } 289