1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * Copyright (c) 2002-2008 Atheros Communications, Inc. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 * 19 * $FreeBSD$ 20 */ 21 #include "opt_ah.h" 22 23 #include "ah.h" 24 #include "ah_internal.h" 25 26 #include "ar5416/ar5416.h" 27 #include "ar5416/ar5416reg.h" 28 #include "ar5416/ar5416phy.h" 29 30 #define TU_TO_USEC(_tu) ((_tu) << 10) 31 #define ONE_EIGHTH_TU_TO_USEC(_tu8) ((_tu8) << 7) 32 33 /* 34 * Return the hardware NextTBTT in TSF 35 */ 36 uint64_t 37 ar5416GetNextTBTT(struct ath_hal *ah) 38 { 39 return OS_REG_READ(ah, AR_NEXT_TBTT); 40 } 41 42 /* 43 * Initialize all of the hardware registers used to 44 * send beacons. Note that for station operation the 45 * driver calls ar5416SetStaBeaconTimers instead. 46 */ 47 void 48 ar5416SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt) 49 { 50 uint32_t bperiod; 51 struct ath_hal_5212 *ahp = AH5212(ah); 52 53 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bt->bt_nexttbtt)); 54 OS_REG_WRITE(ah, AR_NEXT_DBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextdba)); 55 OS_REG_WRITE(ah, AR_NEXT_SWBA, ONE_EIGHTH_TU_TO_USEC(bt->bt_nextswba)); 56 OS_REG_WRITE(ah, AR_NEXT_NDP, TU_TO_USEC(bt->bt_nextatim)); 57 58 bperiod = TU_TO_USEC(bt->bt_intval & HAL_BEACON_PERIOD); 59 ahp->ah_beaconInterval = bt->bt_intval & HAL_BEACON_PERIOD; 60 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, bperiod); 61 OS_REG_WRITE(ah, AR_DBA_PERIOD, bperiod); 62 OS_REG_WRITE(ah, AR_SWBA_PERIOD, bperiod); 63 OS_REG_WRITE(ah, AR_NDP_PERIOD, bperiod); 64 65 /* 66 * Reset TSF if required. 67 */ 68 if (bt->bt_intval & AR_BEACON_RESET_TSF) 69 ar5416ResetTsf(ah); 70 71 /* enable timers */ 72 /* NB: flags == 0 handled specially for backwards compatibility */ 73 OS_REG_SET_BIT(ah, AR_TIMER_MODE, 74 bt->bt_flags != 0 ? bt->bt_flags : 75 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_DBA | AR_TIMER_MODE_SWBA); 76 } 77 78 /* 79 * Initializes all of the hardware registers used to 80 * send beacons. Note that for station operation the 81 * driver calls ar5212SetStaBeaconTimers instead. 82 */ 83 void 84 ar5416BeaconInit(struct ath_hal *ah, 85 uint32_t next_beacon, uint32_t beacon_period) 86 { 87 HAL_BEACON_TIMERS bt; 88 89 bt.bt_nexttbtt = next_beacon; 90 /* 91 * TIMER1: in AP/adhoc mode this controls the DMA beacon 92 * alert timer; otherwise it controls the next wakeup time. 93 * TIMER2: in AP mode, it controls the SBA beacon alert 94 * interrupt; otherwise it sets the start of the next CFP. 95 */ 96 bt.bt_flags = 0; 97 switch (AH_PRIVATE(ah)->ah_opmode) { 98 case HAL_M_STA: 99 case HAL_M_MONITOR: 100 bt.bt_nextdba = 0xffff; 101 bt.bt_nextswba = 0x7ffff; 102 bt.bt_flags |= AR_TIMER_MODE_TBTT; 103 break; 104 case HAL_M_IBSS: 105 OS_REG_SET_BIT(ah, AR_TXCFG, AR_TXCFG_ATIM_TXPOLICY); 106 bt.bt_flags |= AR_TIMER_MODE_NDP; 107 /* fall thru... */ 108 case HAL_M_HOSTAP: 109 bt.bt_nextdba = (next_beacon - 110 ah->ah_config.ah_dma_beacon_response_time) << 3; /* 1/8 TU */ 111 bt.bt_nextswba = (next_beacon - 112 ah->ah_config.ah_sw_beacon_response_time) << 3; /* 1/8 TU */ 113 bt.bt_flags |= AR_TIMER_MODE_TBTT 114 | AR_TIMER_MODE_DBA 115 | AR_TIMER_MODE_SWBA; 116 break; 117 } 118 /* 119 * Set the ATIM window 120 * Our hardware does not support an ATIM window of 0 121 * (beacons will not work). If the ATIM windows is 0, 122 * force it to 1. 123 */ 124 bt.bt_nextatim = next_beacon + 1; 125 bt.bt_intval = beacon_period & 126 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN); 127 ar5416SetBeaconTimers(ah, &bt); 128 } 129 130 #define AR_BEACON_PERIOD_MAX 0xffff 131 132 void 133 ar5416ResetStaBeaconTimers(struct ath_hal *ah) 134 { 135 uint32_t val; 136 137 OS_REG_WRITE(ah, AR_NEXT_TBTT, 0); /* no beacons */ 138 val = OS_REG_READ(ah, AR_STA_ID1); 139 val |= AR_STA_ID1_PWR_SAV; /* XXX */ 140 /* tell the h/w that the associated AP is not PCF capable */ 141 OS_REG_WRITE(ah, AR_STA_ID1, 142 val & ~(AR_STA_ID1_USE_DEFANT | AR_STA_ID1_PCF)); 143 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, AR_BEACON_PERIOD_MAX); 144 OS_REG_WRITE(ah, AR_DBA_PERIOD, AR_BEACON_PERIOD_MAX); 145 } 146 147 /* 148 * Set all the beacon related bits on the h/w for stations 149 * i.e. initializes the corresponding h/w timers; 150 * also tells the h/w whether to anticipate PCF beacons 151 */ 152 void 153 ar5416SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs) 154 { 155 uint32_t nextTbtt, nextdtim,beaconintval, dtimperiod; 156 157 HALASSERT(bs->bs_intval != 0); 158 159 /* NB: no cfp setting since h/w automatically takes care */ 160 161 OS_REG_WRITE(ah, AR_NEXT_TBTT, TU_TO_USEC(bs->bs_nexttbtt)); 162 163 /* 164 * Start the beacon timers by setting the BEACON register 165 * to the beacon interval; no need to write tim offset since 166 * h/w parses IEs. 167 */ 168 OS_REG_WRITE(ah, AR5416_BEACON_PERIOD, 169 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD)); 170 OS_REG_WRITE(ah, AR_DBA_PERIOD, 171 TU_TO_USEC(bs->bs_intval & HAL_BEACON_PERIOD)); 172 173 /* 174 * Configure the BMISS interrupt. Note that we 175 * assume the caller blocks interrupts while enabling 176 * the threshold. 177 */ 178 HALASSERT(bs->bs_bmissthreshold <= 179 (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S)); 180 OS_REG_RMW_FIELD(ah, AR_RSSI_THR, 181 AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold); 182 183 /* 184 * Program the sleep registers to correlate with the beacon setup. 185 */ 186 187 /* 188 * Oahu beacons timers on the station were used for power 189 * save operation (waking up in anticipation of a beacon) 190 * and any CFP function; Venice does sleep/power-save timers 191 * differently - so this is the right place to set them up; 192 * don't think the beacon timers are used by venice sta hw 193 * for any useful purpose anymore 194 * Setup venice's sleep related timers 195 * Current implementation assumes sw processing of beacons - 196 * assuming an interrupt is generated every beacon which 197 * causes the hardware to become awake until the sw tells 198 * it to go to sleep again; beacon timeout is to allow for 199 * beacon jitter; cab timeout is max time to wait for cab 200 * after seeing the last DTIM or MORE CAB bit 201 */ 202 203 /* 204 * I've bumped these to 30TU for now. 205 * 206 * Some APs (AR933x/AR934x?) in 2GHz especially seem to not always 207 * transmit beacon frames at exactly the right times and with it set 208 * to 10TU, the NIC starts not waking up at the right times to hear 209 * these slightly-larger-jitering beacons. It also never recovers 210 * from that (it doesn't resync? I'm not sure.) 211 * 212 * So for now bump this to 30TU. Ideally we'd cap this based on 213 * the beacon interval so the sum of CAB+BEACON timeouts never 214 * exceeded the beacon interval. 215 * 216 * Now, since we're doing all the math in the ath(4) driver in TU 217 * rather than TSF, we may be seeing the result of dumb rounding 218 * errors causing the jitter to actually be a much bigger problem. 219 * I'll have to investigate that with a fine tooth comb. 220 */ 221 #define CAB_TIMEOUT_VAL 10 /* in TU */ 222 #define BEACON_TIMEOUT_VAL 10 /* in TU */ 223 #define SLEEP_SLOP 3 /* in TU */ 224 225 /* 226 * For max powersave mode we may want to sleep for longer than a 227 * beacon period and not want to receive all beacons; modify the 228 * timers accordingly; make sure to align the next TIM to the 229 * next DTIM if we decide to wake for DTIMs only 230 */ 231 beaconintval = bs->bs_intval & HAL_BEACON_PERIOD; 232 HALASSERT(beaconintval != 0); 233 if (bs->bs_sleepduration > beaconintval) { 234 HALASSERT(roundup(bs->bs_sleepduration, beaconintval) == 235 bs->bs_sleepduration); 236 beaconintval = bs->bs_sleepduration; 237 } 238 dtimperiod = bs->bs_dtimperiod; 239 if (bs->bs_sleepduration > dtimperiod) { 240 HALASSERT(dtimperiod == 0 || 241 roundup(bs->bs_sleepduration, dtimperiod) == 242 bs->bs_sleepduration); 243 dtimperiod = bs->bs_sleepduration; 244 } 245 HALASSERT(beaconintval <= dtimperiod); 246 if (beaconintval == dtimperiod) 247 nextTbtt = bs->bs_nextdtim; 248 else 249 nextTbtt = bs->bs_nexttbtt; 250 nextdtim = bs->bs_nextdtim; 251 252 OS_REG_WRITE(ah, AR_NEXT_DTIM, 253 TU_TO_USEC(bs->bs_nextdtim - SLEEP_SLOP)); 254 OS_REG_WRITE(ah, AR_NEXT_TIM, TU_TO_USEC(nextTbtt - SLEEP_SLOP)); 255 256 /* cab timeout is now in 1/8 TU */ 257 OS_REG_WRITE(ah, AR5416_SLEEP1, 258 SM((CAB_TIMEOUT_VAL << 3), AR5416_SLEEP1_CAB_TIMEOUT) 259 | AR5416_SLEEP1_ASSUME_DTIM); 260 261 /* XXX autosleep? Use min beacon timeout; check ath9k -adrian */ 262 /* beacon timeout is now in 1/8 TU */ 263 OS_REG_WRITE(ah, AR5416_SLEEP2, 264 SM((BEACON_TIMEOUT_VAL << 3), AR5416_SLEEP2_BEACON_TIMEOUT)); 265 266 /* TIM_PERIOD and DTIM_PERIOD are now in uS. */ 267 OS_REG_WRITE(ah, AR_TIM_PERIOD, TU_TO_USEC(beaconintval)); 268 OS_REG_WRITE(ah, AR_DTIM_PERIOD, TU_TO_USEC(dtimperiod)); 269 270 OS_REG_SET_BIT(ah, AR_TIMER_MODE, 271 AR_TIMER_MODE_TBTT | AR_TIMER_MODE_TIM | AR_TIMER_MODE_DTIM); 272 273 #define HAL_TSFOOR_THRESHOLD 0x00004240 /* TSF OOR threshold (16k us) */ 274 275 /* TSF out of range threshold */ 276 // OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, bs->bs_tsfoor_threshold); 277 OS_REG_WRITE(ah, AR_TSFOOR_THRESHOLD, HAL_TSFOOR_THRESHOLD); 278 279 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next DTIM %d\n", 280 __func__, bs->bs_nextdtim); 281 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: next beacon %d\n", 282 __func__, nextTbtt); 283 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: beacon period %d\n", 284 __func__, beaconintval); 285 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: DTIM period %d\n", 286 __func__, dtimperiod); 287 #undef CAB_TIMEOUT_VAL 288 #undef BEACON_TIMEOUT_VAL 289 #undef SLEEP_SLOP 290 } 291