142 lines
4.2 KiB
Diff
142 lines
4.2 KiB
Diff
--- a/ath/if_ath.c
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+++ b/ath/if_ath.c
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@@ -161,6 +161,7 @@ static void ath_beacon_send(struct ath_s
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static void ath_beacon_return(struct ath_softc *, struct ath_buf *);
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static void ath_beacon_free(struct ath_softc *);
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static void ath_beacon_config(struct ath_softc *, struct ieee80211vap *);
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+static void ath_hw_beacon_stop(struct ath_softc *sc);
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static int ath_desc_alloc(struct ath_softc *);
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static void ath_desc_free(struct ath_softc *);
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static void ath_desc_swap(struct ath_desc *);
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@@ -2793,6 +2794,72 @@ ath_set_ack_bitrate(struct ath_softc *sc
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return 1;
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}
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+static void
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+ath_hw_beacon_stop(struct ath_softc *sc)
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+{
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+ HAL_BEACON_TIMERS btimers;
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+
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+ btimers.bt_intval = 0;
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+ btimers.bt_nexttbtt = 0;
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+ btimers.bt_nextdba = 0xffffffff;
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+ btimers.bt_nextswba = 0xffffffff;
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+ btimers.bt_nextatim = 0;
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+
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+ ath_hal_setbeacontimers(sc->sc_ah, &btimers);
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+}
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+
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+/* Fix up the ATIM window after TSF resync */
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+static int
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+ath_hw_check_atim(struct ath_softc *sc, int window, int intval)
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+{
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+#define AR5K_TIMER0_5210 0x802c /* Next beacon time register */
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+#define AR5K_TIMER0_5211 0x8028
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+#define AR5K_TIMER3_5210 0x8038 /* End of ATIM window time register */
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+#define AR5K_TIMER3_5211 0x8034
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+ struct ath_hal *ah = sc->sc_ah;
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+ int dev = sc->sc_ah->ah_macType;
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+ unsigned int nbtt, atim;
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+ int is_5210 = 0;
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+
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+ /*
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+ * check if the ATIM window is still correct:
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+ * 1.) usually ATIM should be NBTT + window
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+ * 2.) nbtt already updated
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+ * 3.) nbtt already updated and has wrapped around
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+ * 4.) atim has wrapped around
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+ */
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+ switch(dev) {
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+ case 5210:
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+ nbtt = OS_REG_READ(ah, AR5K_TIMER0_5210);
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+ atim = OS_REG_READ(ah, AR5K_TIMER3_5210);
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+ is_5210 = 1;
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+ break;
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+ case 5211:
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+ case 5212:
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+ nbtt = OS_REG_READ(ah, AR5K_TIMER0_5211);
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+ atim = OS_REG_READ(ah, AR5K_TIMER3_5211);
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+ break;
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+ /* NB: 5416+ doesn't do ATIM in hw */
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+ case 5416:
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+ default:
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+ return 0;
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+ }
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+
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+ if ((atim - nbtt != window) && /* 1.) */
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+ (nbtt - atim != intval - window) && /* 2.) */
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+ ((nbtt | 0x10000) - atim != intval - window) && /* 3.) */
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+ ((atim | 0x10000) - nbtt != window)) { /* 4.) */
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+ if (is_5210)
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+ OS_REG_WRITE(ah, AR5K_TIMER3_5210, nbtt + window );
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+ else
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+ OS_REG_WRITE(ah, AR5K_TIMER3_5211, nbtt + window );
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+ return atim - nbtt;
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+ }
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+
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+ return 0;
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+}
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+
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+
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/*
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* Reset the hardware w/o losing operational state. This is
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* basically a more efficient way of doing ath_stop, ath_init,
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@@ -5294,6 +5361,7 @@ ath_beacon_config(struct ath_softc *sc,
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u_int64_t tsf, hw_tsf;
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u_int32_t tsftu, hw_tsftu;
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u_int32_t intval, nexttbtt = 0;
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+ unsigned long flags;
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int reset_tsf = 0;
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if (vap == NULL)
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@@ -5301,6 +5369,9 @@ ath_beacon_config(struct ath_softc *sc,
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ni = vap->iv_bss;
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+ /* TSF calculation is timing critical - we don't want to be interrupted here */
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+ local_irq_save(flags);
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+
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hw_tsf = ath_hal_gettsf64(ah);
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tsf = le64_to_cpu(ni->ni_tstamp.tsf);
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hw_tsftu = hw_tsf >> 10;
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@@ -5490,15 +5561,27 @@ ath_beacon_config(struct ath_softc *sc,
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<= ath_hal_sw_beacon_response_time)
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nexttbtt += intval;
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sc->sc_nexttbtt = nexttbtt;
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+
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+ /* stop beacons before reconfiguring the timers to avoid race
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+ * conditions. ath_hal_beaconinit will start them again */
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+ ath_hw_beacon_stop(sc);
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+
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ath_hal_beaconinit(ah, nexttbtt, intval);
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if (intval & HAL_BEACON_RESET_TSF) {
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sc->sc_last_tsf = 0;
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}
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sc->sc_bmisscount = 0;
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ath_hal_intrset(ah, sc->sc_imask);
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+
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+ if ((sc->sc_opmode == HAL_M_IBSS) && ath_hw_check_atim(sc, 1, intval & HAL_BEACON_PERIOD)) {
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+ DPRINTF(sc, ATH_DEBUG_BEACON,
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+ "fixed atim window after beacon init\n");
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+ }
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}
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ath_beacon_config_debug:
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+ local_irq_restore(flags);
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+
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/* We print all debug messages here, in order to preserve the
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* time critical aspect of this function */
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DPRINTF(sc, ATH_DEBUG_BEACON,
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@@ -6401,6 +6484,11 @@ ath_recv_mgmt(struct ieee80211vap * vap,
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DPRINTF(sc, ATH_DEBUG_BEACON,
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"Updated beacon timers\n");
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}
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+ if ((sc->sc_opmode == HAL_M_IBSS) &&
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+ IEEE80211_ADDR_EQ(ni->ni_bssid, vap->iv_bss->ni_bssid) &&
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+ ath_hw_check_atim(sc, 1, vap->iv_bss->ni_intval)) {
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+ DPRINTF(sc, ATH_DEBUG_ANY, "Fixed ATIM window after beacon recv\n");
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+ }
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/* NB: Fall Through */
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case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
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if (vap->iv_opmode == IEEE80211_M_IBSS &&
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