1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/mci.c b/drivers/net/wireless/ath/ath9k/mci.c
new file mode 100644
index 000000000000..0fbb141bc302
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/mci.c
@@ -0,0 +1,254 @@
+/*
+ * Copyright (c) 2010-2011 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 "ath9k.h"
+#include "mci.h"
+
+u8 ath_mci_duty_cycle[] = { 0, 50, 60, 70, 80, 85, 90, 95, 98 };
+
+static struct ath_mci_profile_info*
+ath_mci_find_profile(struct ath_mci_profile *mci,
+		     struct ath_mci_profile_info *info)
+{
+	struct ath_mci_profile_info *entry;
+
+	list_for_each_entry(entry, &mci->info, list) {
+		if (entry->conn_handle == info->conn_handle)
+			break;
+	}
+	return entry;
+}
+
+static bool ath_mci_add_profile(struct ath_common *common,
+				struct ath_mci_profile *mci,
+				struct ath_mci_profile_info *info)
+{
+	struct ath_mci_profile_info *entry;
+
+	if ((mci->num_sco == ATH_MCI_MAX_SCO_PROFILE) &&
+	    (info->type == MCI_GPM_COEX_PROFILE_VOICE)) {
+		ath_dbg(common, ATH_DBG_MCI,
+			"Too many SCO profile, failed to add new profile\n");
+		return false;
+	}
+
+	if (((NUM_PROF(mci) - mci->num_sco) == ATH_MCI_MAX_ACL_PROFILE) &&
+	    (info->type != MCI_GPM_COEX_PROFILE_VOICE)) {
+		ath_dbg(common, ATH_DBG_MCI,
+			"Too many ACL profile, failed to add new profile\n");
+		return false;
+	}
+
+	entry = ath_mci_find_profile(mci, info);
+
+	if (entry)
+		memcpy(entry, info, 10);
+	else {
+		entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+		if (!entry)
+			return false;
+
+		memcpy(entry, info, 10);
+		INC_PROF(mci, info);
+		list_add_tail(&info->list, &mci->info);
+	}
+	return true;
+}
+
+static void ath_mci_del_profile(struct ath_common *common,
+				struct ath_mci_profile *mci,
+				struct ath_mci_profile_info *info)
+{
+	struct ath_mci_profile_info *entry;
+
+	entry = ath_mci_find_profile(mci, info);
+
+	if (!entry) {
+		ath_dbg(common, ATH_DBG_MCI,
+			"Profile to be deleted not found\n");
+		return;
+	}
+	DEC_PROF(mci, entry);
+	list_del(&entry->list);
+	kfree(entry);
+}
+
+void ath_mci_flush_profile(struct ath_mci_profile *mci)
+{
+	struct ath_mci_profile_info *info, *tinfo;
+
+	list_for_each_entry_safe(info, tinfo, &mci->info, list) {
+		list_del(&info->list);
+		DEC_PROF(mci, info);
+		kfree(info);
+	}
+	mci->aggr_limit = 0;
+}
+
+static void ath_mci_adjust_aggr_limit(struct ath_btcoex *btcoex)
+{
+	struct ath_mci_profile *mci = &btcoex->mci;
+	u32 wlan_airtime = btcoex->btcoex_period *
+				(100 - btcoex->duty_cycle) / 100;
+
+	/*
+	 * Scale: wlan_airtime is in ms, aggr_limit is in 0.25 ms.
+	 * When wlan_airtime is less than 4ms, aggregation limit has to be
+	 * adjusted half of wlan_airtime to ensure that the aggregation can fit
+	 * without collision with BT traffic.
+	 */
+	if ((wlan_airtime <= 4) &&
+	    (!mci->aggr_limit || (mci->aggr_limit > (2 * wlan_airtime))))
+		mci->aggr_limit = 2 * wlan_airtime;
+}
+
+static void ath_mci_update_scheme(struct ath_softc *sc)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_btcoex *btcoex = &sc->btcoex;
+	struct ath_mci_profile *mci = &btcoex->mci;
+	struct ath_mci_profile_info *info;
+	u32 num_profile = NUM_PROF(mci);
+
+	if (num_profile == 1) {
+		info = list_first_entry(&mci->info,
+					struct ath_mci_profile_info,
+					list);
+		if (mci->num_sco && info->T == 12) {
+			mci->aggr_limit = 8;
+			ath_dbg(common, ATH_DBG_MCI,
+				"Single SCO, aggregation limit 2 ms\n");
+		} else if ((info->type == MCI_GPM_COEX_PROFILE_BNEP) &&
+			   !info->master) {
+			btcoex->btcoex_period = 60;
+			ath_dbg(common, ATH_DBG_MCI,
+				"Single slave PAN/FTP, bt period 60 ms\n");
+		} else if ((info->type == MCI_GPM_COEX_PROFILE_HID) &&
+			 (info->T > 0 && info->T < 50) &&
+			 (info->A > 1 || info->W > 1)) {
+			btcoex->duty_cycle = 30;
+			mci->aggr_limit = 8;
+			ath_dbg(common, ATH_DBG_MCI,
+				"Multiple attempt/timeout single HID "
+				"aggregation limit 2 ms dutycycle 30%%\n");
+		}
+	} else if ((num_profile == 2) && (mci->num_hid == 2)) {
+		btcoex->duty_cycle = 30;
+		mci->aggr_limit = 8;
+		ath_dbg(common, ATH_DBG_MCI,
+			"Two HIDs aggregation limit 2 ms dutycycle 30%%\n");
+	} else if (num_profile > 3) {
+		mci->aggr_limit = 6;
+		ath_dbg(common, ATH_DBG_MCI,
+			"Three or more profiles aggregation limit 1.5 ms\n");
+	}
+
+	if (IS_CHAN_2GHZ(sc->sc_ah->curchan)) {
+		if (IS_CHAN_HT(sc->sc_ah->curchan))
+			ath_mci_adjust_aggr_limit(btcoex);
+		else
+			btcoex->btcoex_period >>= 1;
+	}
+
+	ath9k_hw_btcoex_disable(sc->sc_ah);
+	ath9k_btcoex_timer_pause(sc);
+
+	if (IS_CHAN_5GHZ(sc->sc_ah->curchan))
+		return;
+
+	btcoex->duty_cycle += (mci->num_bdr ? ATH_MCI_MAX_DUTY_CYCLE : 0);
+	if (btcoex->duty_cycle > ATH_MCI_MAX_DUTY_CYCLE)
+		btcoex->duty_cycle = ATH_MCI_MAX_DUTY_CYCLE;
+
+	btcoex->btcoex_period *= 1000;
+	btcoex->btcoex_no_stomp =  btcoex->btcoex_period *
+					(100 - btcoex->duty_cycle) / 100;
+
+	ath9k_hw_btcoex_enable(sc->sc_ah);
+	ath9k_btcoex_timer_resume(sc);
+}
+
+void ath_mci_process_profile(struct ath_softc *sc,
+			     struct ath_mci_profile_info *info)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_btcoex *btcoex = &sc->btcoex;
+	struct ath_mci_profile *mci = &btcoex->mci;
+
+	if (info->start) {
+		if (!ath_mci_add_profile(common, mci, info))
+			return;
+	} else
+		ath_mci_del_profile(common, mci, info);
+
+	btcoex->btcoex_period = ATH_MCI_DEF_BT_PERIOD;
+	mci->aggr_limit = mci->num_sco ? 6 : 0;
+	if (NUM_PROF(mci)) {
+		btcoex->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
+		btcoex->duty_cycle = ath_mci_duty_cycle[NUM_PROF(mci)];
+	} else {
+		btcoex->bt_stomp_type = mci->num_mgmt ? ATH_BTCOEX_STOMP_ALL :
+							ATH_BTCOEX_STOMP_LOW;
+		btcoex->duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
+	}
+
+	ath_mci_update_scheme(sc);
+}
+
+void ath_mci_process_status(struct ath_softc *sc,
+			    struct ath_mci_profile_status *status)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_btcoex *btcoex = &sc->btcoex;
+	struct ath_mci_profile *mci = &btcoex->mci;
+	struct ath_mci_profile_info info;
+	int i = 0, old_num_mgmt = mci->num_mgmt;
+
+	/* Link status type are not handled */
+	if (status->is_link) {
+		ath_dbg(common, ATH_DBG_MCI,
+			"Skip link type status update\n");
+		return;
+	}
+
+	memset(&info, 0, sizeof(struct ath_mci_profile_info));
+
+	info.conn_handle = status->conn_handle;
+	if (ath_mci_find_profile(mci, &info)) {
+		ath_dbg(common, ATH_DBG_MCI,
+			"Skip non link state update for existing profile %d\n",
+			status->conn_handle);
+		return;
+	}
+	if (status->conn_handle >= ATH_MCI_MAX_PROFILE) {
+		ath_dbg(common, ATH_DBG_MCI,
+			"Ignore too many non-link update\n");
+		return;
+	}
+	if (status->is_critical)
+		__set_bit(status->conn_handle, mci->status);
+	else
+		__clear_bit(status->conn_handle, mci->status);
+
+	mci->num_mgmt = 0;
+	do {
+		if (test_bit(i, mci->status))
+			mci->num_mgmt++;
+	} while (++i < ATH_MCI_MAX_PROFILE);
+
+	if (old_num_mgmt != mci->num_mgmt)
+		ath_mci_update_scheme(sc);
+}