2 * Copyright (c) 2010 Atheros Communications Inc.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 static void ath9k_htc_beacon_config_sta(struct ath9k_htc_priv *priv,
22 struct htc_beacon_config *bss_conf)
24 struct ath_common *common = ath9k_hw_common(priv->ah);
25 struct ath9k_beacon_state bs;
26 enum ath9k_int imask = 0;
27 int dtimperiod, dtimcount, sleepduration;
28 int cfpperiod, cfpcount, bmiss_timeout;
29 u32 nexttbtt = 0, intval, tsftu, htc_imask = 0;
31 int num_beacons, offset, dtim_dec_count, cfp_dec_count;
35 memset(&bs, 0, sizeof(bs));
37 intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
38 bmiss_timeout = (ATH_DEFAULT_BMISS_LIMIT * bss_conf->beacon_interval);
41 * Setup dtim and cfp parameters according to
42 * last beacon we received (which may be none).
44 dtimperiod = bss_conf->dtim_period;
45 if (dtimperiod <= 0) /* NB: 0 if not known */
48 if (dtimcount >= dtimperiod) /* NB: sanity check */
50 cfpperiod = 1; /* NB: no PCF support yet */
53 sleepduration = intval;
54 if (sleepduration <= 0)
55 sleepduration = intval;
58 * Pull nexttbtt forward to reflect the current
59 * TSF and calculate dtim+cfp state for the result.
61 tsf = ath9k_hw_gettsf64(priv->ah);
62 tsftu = TSF_TO_TU(tsf>>32, tsf) + FUDGE;
64 num_beacons = tsftu / intval + 1;
65 offset = tsftu % intval;
66 nexttbtt = tsftu - offset;
70 /* DTIM Beacon every dtimperiod Beacon */
71 dtim_dec_count = num_beacons % dtimperiod;
72 /* CFP every cfpperiod DTIM Beacon */
73 cfp_dec_count = (num_beacons / dtimperiod) % cfpperiod;
77 dtimcount -= dtim_dec_count;
79 dtimcount += dtimperiod;
81 cfpcount -= cfp_dec_count;
83 cfpcount += cfpperiod;
85 bs.bs_intval = intval;
86 bs.bs_nexttbtt = nexttbtt;
87 bs.bs_dtimperiod = dtimperiod*intval;
88 bs.bs_nextdtim = bs.bs_nexttbtt + dtimcount*intval;
89 bs.bs_cfpperiod = cfpperiod*bs.bs_dtimperiod;
90 bs.bs_cfpnext = bs.bs_nextdtim + cfpcount*bs.bs_dtimperiod;
91 bs.bs_cfpmaxduration = 0;
94 * Calculate the number of consecutive beacons to miss* before taking
95 * a BMISS interrupt. The configuration is specified in TU so we only
96 * need calculate based on the beacon interval. Note that we clamp the
97 * result to at most 15 beacons.
99 if (sleepduration > intval) {
100 bs.bs_bmissthreshold = ATH_DEFAULT_BMISS_LIMIT / 2;
102 bs.bs_bmissthreshold = DIV_ROUND_UP(bmiss_timeout, intval);
103 if (bs.bs_bmissthreshold > 15)
104 bs.bs_bmissthreshold = 15;
105 else if (bs.bs_bmissthreshold <= 0)
106 bs.bs_bmissthreshold = 1;
110 * Calculate sleep duration. The configuration is given in ms.
111 * We ensure a multiple of the beacon period is used. Also, if the sleep
112 * duration is greater than the DTIM period then it makes senses
113 * to make it a multiple of that.
118 bs.bs_sleepduration = roundup(IEEE80211_MS_TO_TU(100), sleepduration);
119 if (bs.bs_sleepduration > bs.bs_dtimperiod)
120 bs.bs_sleepduration = bs.bs_dtimperiod;
122 /* TSF out of range threshold fixed at 1 second */
123 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
125 ath_print(common, ATH_DBG_BEACON, "tsf: %llu tsftu: %u\n", tsf, tsftu);
126 ath_print(common, ATH_DBG_BEACON,
127 "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
128 bs.bs_bmissthreshold, bs.bs_sleepduration,
129 bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
131 /* Set the computed STA beacon timers */
133 WMI_CMD(WMI_DISABLE_INTR_CMDID);
134 ath9k_hw_set_sta_beacon_timers(priv->ah, &bs);
135 imask |= ATH9K_INT_BMISS;
136 htc_imask = cpu_to_be32(imask);
137 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
140 static void ath9k_htc_beacon_config_adhoc(struct ath9k_htc_priv *priv,
141 struct htc_beacon_config *bss_conf)
143 struct ath_common *common = ath9k_hw_common(priv->ah);
144 enum ath9k_int imask = 0;
145 u32 nexttbtt, intval, htc_imask = 0;
149 intval = bss_conf->beacon_interval & ATH9K_BEACON_PERIOD;
151 intval |= ATH9K_BEACON_ENA;
152 if (priv->op_flags & OP_ENABLE_BEACON)
153 imask |= ATH9K_INT_SWBA;
155 ath_print(common, ATH_DBG_BEACON,
156 "IBSS Beacon config, intval: %d, imask: 0x%x\n",
157 bss_conf->beacon_interval, imask);
159 WMI_CMD(WMI_DISABLE_INTR_CMDID);
160 ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
162 htc_imask = cpu_to_be32(imask);
163 WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
166 void ath9k_htc_beacon_update(struct ath9k_htc_priv *priv,
167 struct ieee80211_vif *vif)
169 struct ath_common *common = ath9k_hw_common(priv->ah);
171 spin_lock_bh(&priv->beacon_lock);
174 dev_kfree_skb_any(priv->beacon);
176 priv->beacon = ieee80211_beacon_get(priv->hw, vif);
178 ath_print(common, ATH_DBG_BEACON,
179 "Unable to allocate beacon\n");
181 spin_unlock_bh(&priv->beacon_lock);
184 void ath9k_htc_swba(struct ath9k_htc_priv *priv, u8 beacon_pending)
186 struct ath9k_htc_vif *avp = (void *)priv->vif->drv_priv;
187 struct tx_beacon_header beacon_hdr;
188 struct ath9k_htc_tx_ctl tx_ctl;
189 struct ieee80211_tx_info *info;
192 memset(&beacon_hdr, 0, sizeof(struct tx_beacon_header));
193 memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
195 /* FIXME: Handle BMISS */
196 if (beacon_pending != 0) {
201 spin_lock_bh(&priv->beacon_lock);
203 if (unlikely(priv->op_flags & OP_SCANNING)) {
204 spin_unlock_bh(&priv->beacon_lock);
208 if (unlikely(priv->beacon == NULL)) {
209 spin_unlock_bh(&priv->beacon_lock);
213 /* Free the old SKB first */
214 dev_kfree_skb_any(priv->beacon);
216 /* Get a new beacon */
217 priv->beacon = ieee80211_beacon_get(priv->hw, priv->vif);
219 spin_unlock_bh(&priv->beacon_lock);
223 info = IEEE80211_SKB_CB(priv->beacon);
224 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
225 struct ieee80211_hdr *hdr =
226 (struct ieee80211_hdr *) priv->beacon->data;
227 priv->seq_no += 0x10;
228 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
229 hdr->seq_ctrl |= cpu_to_le16(priv->seq_no);
232 tx_ctl.type = ATH9K_HTC_NORMAL;
233 beacon_hdr.vif_index = avp->index;
234 tx_fhdr = skb_push(priv->beacon, sizeof(beacon_hdr));
235 memcpy(tx_fhdr, (u8 *) &beacon_hdr, sizeof(beacon_hdr));
237 htc_send(priv->htc, priv->beacon, priv->beacon_ep, &tx_ctl);
239 spin_unlock_bh(&priv->beacon_lock);
243 void ath9k_htc_beacon_config(struct ath9k_htc_priv *priv,
244 struct ieee80211_vif *vif)
246 struct ath_common *common = ath9k_hw_common(priv->ah);
247 enum nl80211_iftype iftype;
248 struct htc_beacon_config *cur_conf = &priv->cur_beacon_conf;
251 struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
253 cur_conf->beacon_interval = bss_conf->beacon_int;
254 cur_conf->dtim_period = bss_conf->dtim_period;
255 cur_conf->listen_interval = 1;
256 cur_conf->dtim_count = 1;
257 cur_conf->bmiss_timeout =
258 ATH_DEFAULT_BMISS_LIMIT * cur_conf->beacon_interval;
260 iftype = priv->ah->opmode;
262 if (cur_conf->beacon_interval == 0)
263 cur_conf->beacon_interval = 100;
266 case NL80211_IFTYPE_STATION:
267 ath9k_htc_beacon_config_sta(priv, cur_conf);
269 case NL80211_IFTYPE_ADHOC:
270 ath9k_htc_beacon_config_adhoc(priv, cur_conf);
273 ath_print(common, ATH_DBG_CONFIG,
274 "Unsupported beaconing mode\n");