ath9k: move ath9k_beacon_config_sta to common-beacon

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 126 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/common-beacon.c b/drivers/net/wireless/ath/ath9k/common-beacon.c
new file mode 100644
index 000000000000..35cc9fddfb35
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/common-beacon.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2008-2011 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "common.h"
+
+#define FUDGE 2
+
+/* Calculate the modulo of a 64 bit TSF snapshot with a TU divisor */
+static u32 ath9k_mod_tsf64_tu(u64 tsf, u32 div_tu)
+{
+	u32 tsf_mod, tsf_hi, tsf_lo, mod_hi, mod_lo;
+
+	tsf_mod = tsf & (BIT(10) - 1);
+	tsf_hi = tsf >> 32;
+	tsf_lo = ((u32) tsf) >> 10;
+
+	mod_hi = tsf_hi % div_tu;
+	mod_lo = ((mod_hi << 22) + tsf_lo) % div_tu;
+
+	return (mod_lo << 10) | tsf_mod;
+}
+
+static u32 ath9k_get_next_tbtt(struct ath_hw *ah, u64 tsf,
+			       unsigned int interval)
+{
+	unsigned int offset;
+
+	tsf += TU_TO_USEC(FUDGE + ah->config.sw_beacon_response_time);
+	offset = ath9k_mod_tsf64_tu(tsf, interval);
+
+	return (u32) tsf + TU_TO_USEC(interval) - offset;
+}
+
+/*
+ * This sets up the beacon timers according to the timestamp of the last
+ * received beacon and the current TSF, configures PCF and DTIM
+ * handling, programs the sleep registers so the hardware will wakeup in
+ * time to receive beacons, and configures the beacon miss handling so
+ * we'll receive a BMISS interrupt when we stop seeing beacons from the AP
+ * we've associated with.
+ */
+int ath9k_cmn_beacon_config_sta(struct ath_hw *ah,
+				 struct ath_beacon_config *conf,
+				 struct ath9k_beacon_state *bs)
+{
+	struct ath_common *common = ath9k_hw_common(ah);
+	int dtim_intval;
+	u64 tsf;
+
+	/* No need to configure beacon if we are not associated */
+	if (!test_bit(ATH_OP_PRIM_STA_VIF, &common->op_flags)) {
+		ath_dbg(common, BEACON,
+			"STA is not yet associated..skipping beacon config\n");
+		return -EPERM;
+	}
+
+	memset(bs, 0, sizeof(*bs));
+	conf->intval = conf->beacon_interval;
+
+	/*
+	 * Setup dtim parameters according to
+	 * last beacon we received (which may be none).
+	 */
+	dtim_intval = conf->intval * conf->dtim_period;
+
+	/*
+	 * Pull nexttbtt forward to reflect the current
+	 * TSF and calculate dtim state for the result.
+	 */
+	tsf = ath9k_hw_gettsf64(ah);
+	conf->nexttbtt = ath9k_get_next_tbtt(ah, tsf, conf->intval);
+
+	bs->bs_intval = TU_TO_USEC(conf->intval);
+	bs->bs_dtimperiod = conf->dtim_period * bs->bs_intval;
+	bs->bs_nexttbtt = conf->nexttbtt;
+	bs->bs_nextdtim = conf->nexttbtt;
+	if (conf->dtim_period > 1)
+		bs->bs_nextdtim = ath9k_get_next_tbtt(ah, tsf, dtim_intval);
+
+	/*
+	 * Calculate the number of consecutive beacons to miss* before taking
+	 * a BMISS interrupt. The configuration is specified in TU so we only
+	 * need calculate based	on the beacon interval.  Note that we clamp the
+	 * result to at most 15 beacons.
+	 */
+	bs->bs_bmissthreshold = DIV_ROUND_UP(conf->bmiss_timeout, conf->intval);
+	if (bs->bs_bmissthreshold > 15)
+		bs->bs_bmissthreshold = 15;
+	else if (bs->bs_bmissthreshold <= 0)
+		bs->bs_bmissthreshold = 1;
+
+	/*
+	 * Calculate sleep duration. The configuration is given in ms.
+	 * We ensure a multiple of the beacon period is used. Also, if the sleep
+	 * duration is greater than the DTIM period then it makes senses
+	 * to make it a multiple of that.
+	 *
+	 * XXX fixed at 100ms
+	 */
+
+	bs->bs_sleepduration = TU_TO_USEC(roundup(IEEE80211_MS_TO_TU(100),
+						 conf->intval));
+	if (bs->bs_sleepduration > bs->bs_dtimperiod)
+		bs->bs_sleepduration = bs->bs_dtimperiod;
+
+	/* TSF out of range threshold fixed at 1 second */
+	bs->bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
+
+	ath_dbg(common, BEACON, "bmiss: %u sleep: %u\n",
+		bs->bs_bmissthreshold, bs->bs_sleepduration);
+	return 0;
+}
+EXPORT_SYMBOL(ath9k_cmn_beacon_config_sta);