1 /*-
2 * SPDX-License-Identifier: ISC
3 *
4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
5 * Copyright (c) 2002-2004 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 #include "opt_ah.h"
20
21 #include "ah.h"
22 #include "ah_internal.h"
23 #include "ah_desc.h"
24
25 #include "ar5210/ar5210.h"
26 #include "ar5210/ar5210reg.h"
27 #include "ar5210/ar5210desc.h"
28
29 /*
30 * Return the hardware NextTBTT in TSF
31 */
32 uint64_t
ar5210GetNextTBTT(struct ath_hal * ah)33 ar5210GetNextTBTT(struct ath_hal *ah)
34 {
35 #define TU_TO_TSF(_tu) (((uint64_t)(_tu)) << 10)
36 return TU_TO_TSF(OS_REG_READ(ah, AR_TIMER0));
37 #undef TU_TO_TSF
38 }
39
40 /*
41 * Initialize all of the hardware registers used to send beacons.
42 */
43 void
ar5210SetBeaconTimers(struct ath_hal * ah,const HAL_BEACON_TIMERS * bt)44 ar5210SetBeaconTimers(struct ath_hal *ah, const HAL_BEACON_TIMERS *bt)
45 {
46
47 OS_REG_WRITE(ah, AR_TIMER0, bt->bt_nexttbtt);
48 OS_REG_WRITE(ah, AR_TIMER1, bt->bt_nextdba);
49 OS_REG_WRITE(ah, AR_TIMER2, bt->bt_nextswba);
50 OS_REG_WRITE(ah, AR_TIMER3, bt->bt_nextatim);
51 /*
52 * Set the Beacon register after setting all timers.
53 */
54 OS_REG_WRITE(ah, AR_BEACON, bt->bt_intval);
55 }
56
57 /*
58 * Legacy api to Initialize all of the beacon registers.
59 */
60 void
ar5210BeaconInit(struct ath_hal * ah,uint32_t next_beacon,uint32_t beacon_period)61 ar5210BeaconInit(struct ath_hal *ah,
62 uint32_t next_beacon, uint32_t beacon_period)
63 {
64 HAL_BEACON_TIMERS bt;
65
66 bt.bt_nexttbtt = next_beacon;
67
68 if (AH_PRIVATE(ah)->ah_opmode != HAL_M_STA) {
69 bt.bt_nextdba = (next_beacon -
70 ah->ah_config.ah_dma_beacon_response_time) << 3; /* 1/8 TU */
71 bt.bt_nextswba = (next_beacon -
72 ah->ah_config.ah_sw_beacon_response_time) << 3; /* 1/8 TU */
73 /*
74 * The SWBA interrupt is not used for beacons in ad hoc mode
75 * as we don't yet support ATIMs. So since the beacon never
76 * changes, the beacon descriptor is set up once and read
77 * into a special HW buffer, from which it will be
78 * automagically retrieved at each DMA Beacon Alert (DBA).
79 */
80
81 /* Set the ATIM window */
82 bt.bt_nextatim = next_beacon + 0; /* NB: no ATIMs */
83 } else {
84 bt.bt_nextdba = ~0;
85 bt.bt_nextswba = ~0;
86 bt.bt_nextatim = 1;
87 }
88 bt.bt_intval = beacon_period &
89 (AR_BEACON_PERIOD | AR_BEACON_RESET_TSF | AR_BEACON_EN);
90 ar5210SetBeaconTimers(ah, &bt);
91 }
92
93 void
ar5210ResetStaBeaconTimers(struct ath_hal * ah)94 ar5210ResetStaBeaconTimers(struct ath_hal *ah)
95 {
96 uint32_t val;
97
98 OS_REG_WRITE(ah, AR_TIMER0, 0); /* no beacons */
99 val = OS_REG_READ(ah, AR_STA_ID1);
100 val |= AR_STA_ID1_NO_PSPOLL; /* XXX */
101 /* tell the h/w that the associated AP is not PCF capable */
102 OS_REG_WRITE(ah, AR_STA_ID1,
103 val & ~(AR_STA_ID1_DEFAULT_ANTENNA | AR_STA_ID1_PCF));
104 OS_REG_WRITE(ah, AR_BEACON, AR_BEACON_PERIOD);
105 }
106
107 /*
108 * Set all the beacon related bits on the h/w for stations
109 * i.e. initializes the corresponding h/w timers;
110 * also tells the h/w whether to anticipate PCF beacons
111 *
112 * dtim_count and cfp_count from the current beacon - their current
113 * values aren't necessarily maintained in the device struct
114 */
115 void
ar5210SetStaBeaconTimers(struct ath_hal * ah,const HAL_BEACON_STATE * bs)116 ar5210SetStaBeaconTimers(struct ath_hal *ah, const HAL_BEACON_STATE *bs)
117 {
118 struct ath_hal_5210 *ahp = AH5210(ah);
119
120 HALDEBUG(ah, HAL_DEBUG_BEACON, "%s: setting beacon timers\n", __func__);
121
122 HALASSERT(bs->bs_intval != 0);
123 /* if the AP will do PCF */
124 if (bs->bs_cfpmaxduration != 0) {
125 /* tell the h/w that the associated AP is PCF capable */
126 OS_REG_WRITE(ah, AR_STA_ID1,
127 (OS_REG_READ(ah, AR_STA_ID1) &~ AR_STA_ID1_DEFAULT_ANTENNA)
128 | AR_STA_ID1_PCF);
129
130 /* set CFP_PERIOD(1.024ms) register */
131 OS_REG_WRITE(ah, AR_CFP_PERIOD, bs->bs_cfpperiod);
132
133 /* set CFP_DUR(1.024ms) register to max cfp duration */
134 OS_REG_WRITE(ah, AR_CFP_DUR, bs->bs_cfpmaxduration);
135
136 /* set TIMER2(128us) to anticipated time of next CFP */
137 OS_REG_WRITE(ah, AR_TIMER2, bs->bs_cfpnext << 3);
138 } else {
139 /* tell the h/w that the associated AP is not PCF capable */
140 OS_REG_WRITE(ah, AR_STA_ID1,
141 OS_REG_READ(ah, AR_STA_ID1) &~ (AR_STA_ID1_DEFAULT_ANTENNA | AR_STA_ID1_PCF));
142 }
143
144 /*
145 * Set TIMER0(1.024ms) to the anticipated time of the next beacon.
146 */
147 OS_REG_WRITE(ah, AR_TIMER0, bs->bs_nexttbtt);
148
149 /*
150 * Start the beacon timers by setting the BEACON register
151 * to the beacon interval; also write the tim offset which
152 * we should know by now. The code, in ar5211WriteAssocid,
153 * also sets the tim offset once the AID is known which can
154 * be left as such for now.
155 */
156 OS_REG_WRITE(ah, AR_BEACON,
157 (OS_REG_READ(ah, AR_BEACON) &~ (AR_BEACON_PERIOD|AR_BEACON_TIM))
158 | SM(bs->bs_intval, AR_BEACON_PERIOD)
159 | SM(bs->bs_timoffset ? bs->bs_timoffset + 4 : 0, AR_BEACON_TIM)
160 );
161
162 /*
163 * Configure the BMISS interrupt. Note that we
164 * assume the caller blocks interrupts while enabling
165 * the threshold.
166 */
167
168 /*
169 * Interrupt works only on Crete.
170 */
171 if (AH_PRIVATE(ah)->ah_macRev < AR_SREV_CRETE)
172 return;
173 /*
174 * Counter is only 3-bits.
175 * Count of 0 with BMISS interrupt enabled will hang the system
176 * with too many interrupts
177 */
178 if (AH_PRIVATE(ah)->ah_macRev >= AR_SREV_CRETE &&
179 (bs->bs_bmissthreshold&7) == 0) {
180 #ifdef AH_DEBUG
181 ath_hal_printf(ah, "%s: invalid beacon miss threshold %u\n",
182 __func__, bs->bs_bmissthreshold);
183 #endif
184 return;
185 }
186 #define BMISS_MAX (AR_RSSI_THR_BM_THR >> AR_RSSI_THR_BM_THR_S)
187 /*
188 * Configure the BMISS interrupt. Note that we
189 * assume the caller blocks interrupts while enabling
190 * the threshold.
191 *
192 * NB: the beacon miss count field is only 3 bits which
193 * is much smaller than what's found on later parts;
194 * clamp overflow values as a safeguard.
195 */
196 ahp->ah_rssiThr = (ahp->ah_rssiThr &~ AR_RSSI_THR_BM_THR)
197 | SM(bs->bs_bmissthreshold > BMISS_MAX ?
198 BMISS_MAX : bs->bs_bmissthreshold,
199 AR_RSSI_THR_BM_THR);
200 OS_REG_WRITE(ah, AR_RSSI_THR, ahp->ah_rssiThr);
201 #undef BMISS_MAX
202 }
203