1 files changed, 540 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 00000000000..29fe52d6997
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/mci.c
@@ -0,0 +1,540 @@
+/*
+ * 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 <linux/dma-mapping.h>
+#include <linux/slab.h>
+
+#include "ath9k.h"
+#include "mci.h"
+
+static const 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))
+		return false;
+
+	if (((NUM_PROF(mci) - mci->num_sco) == ATH_MCI_MAX_ACL_PROFILE) &&
+	    (info->type != MCI_GPM_COEX_PROFILE_VOICE))
+		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)
+		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, 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, 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, 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, MCI,
+			"Two HIDs aggregation limit 2 ms dutycycle 30%%\n");
+	} else if (num_profile > 3) {
+		mci->aggr_limit = 6;
+		ath_dbg(common, 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);
+}
+
+static void ath_mci_cal_msg(struct ath_softc *sc, u8 opcode, u8 *rx_payload)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	u32 payload[4] = {0, 0, 0, 0};
+
+	switch (opcode) {
+	case MCI_GPM_BT_CAL_REQ:
+		if (ar9003_mci_state(ah, MCI_STATE_BT, NULL) == MCI_BT_AWAKE) {
+			ar9003_mci_state(ah, MCI_STATE_SET_BT_CAL_START, NULL);
+			ieee80211_queue_work(sc->hw, &sc->hw_reset_work);
+		} else {
+			ath_dbg(common, MCI, "MCI State mismatch: %d\n",
+				ar9003_mci_state(ah, MCI_STATE_BT, NULL));
+		}
+		break;
+	case MCI_GPM_BT_CAL_DONE:
+		ar9003_mci_state(ah, MCI_STATE_BT, NULL);
+		break;
+	case MCI_GPM_BT_CAL_GRANT:
+		MCI_GPM_SET_CAL_TYPE(payload, MCI_GPM_WLAN_CAL_DONE);
+		ar9003_mci_send_message(sc->sc_ah, MCI_GPM, 0, payload,
+					16, false, true);
+		break;
+	default:
+		ath_dbg(common, MCI, "Unknown GPM CAL message\n");
+		break;
+	}
+}
+
+static 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);
+}
+
+static void ath_mci_process_status(struct ath_softc *sc,
+				   struct ath_mci_profile_status *status)
+{
+	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)
+		return;
+
+	memset(&info, 0, sizeof(struct ath_mci_profile_info));
+
+	info.conn_handle = status->conn_handle;
+	if (ath_mci_find_profile(mci, &info))
+		return;
+
+	if (status->conn_handle >= ATH_MCI_MAX_PROFILE)
+		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);
+}
+
+static void ath_mci_msg(struct ath_softc *sc, u8 opcode, u8 *rx_payload)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_mci_profile_info profile_info;
+	struct ath_mci_profile_status profile_status;
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	u32 version;
+	u8 major;
+	u8 minor;
+	u32 seq_num;
+
+	switch (opcode) {
+	case MCI_GPM_COEX_VERSION_QUERY:
+		version = ar9003_mci_state(ah, MCI_STATE_SEND_WLAN_COEX_VERSION,
+					   NULL);
+		break;
+	case MCI_GPM_COEX_VERSION_RESPONSE:
+		major = *(rx_payload + MCI_GPM_COEX_B_MAJOR_VERSION);
+		minor = *(rx_payload + MCI_GPM_COEX_B_MINOR_VERSION);
+		version = (major << 8) + minor;
+		version = ar9003_mci_state(ah, MCI_STATE_SET_BT_COEX_VERSION,
+					   &version);
+		break;
+	case MCI_GPM_COEX_STATUS_QUERY:
+		ar9003_mci_state(ah, MCI_STATE_SEND_WLAN_CHANNELS, NULL);
+		break;
+	case MCI_GPM_COEX_BT_PROFILE_INFO:
+		memcpy(&profile_info,
+		       (rx_payload + MCI_GPM_COEX_B_PROFILE_TYPE), 10);
+
+		if ((profile_info.type == MCI_GPM_COEX_PROFILE_UNKNOWN) ||
+		    (profile_info.type >= MCI_GPM_COEX_PROFILE_MAX)) {
+			ath_dbg(common, MCI,
+				"Illegal profile type = %d, state = %d\n",
+				profile_info.type,
+				profile_info.start);
+			break;
+		}
+
+		ath_mci_process_profile(sc, &profile_info);
+		break;
+	case MCI_GPM_COEX_BT_STATUS_UPDATE:
+		profile_status.is_link = *(rx_payload +
+					   MCI_GPM_COEX_B_STATUS_TYPE);
+		profile_status.conn_handle = *(rx_payload +
+					       MCI_GPM_COEX_B_STATUS_LINKID);
+		profile_status.is_critical = *(rx_payload +
+					       MCI_GPM_COEX_B_STATUS_STATE);
+
+		seq_num = *((u32 *)(rx_payload + 12));
+		ath_dbg(common, MCI,
+			"BT_Status_Update: is_link=%d, linkId=%d, state=%d, SEQ=%d\n",
+			profile_status.is_link, profile_status.conn_handle,
+			profile_status.is_critical, seq_num);
+
+		ath_mci_process_status(sc, &profile_status);
+		break;
+	default:
+		ath_dbg(common, MCI, "Unknown GPM COEX message = 0x%02x\n", opcode);
+		break;
+	}
+}
+
+int ath_mci_setup(struct ath_softc *sc)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_mci_coex *mci = &sc->mci_coex;
+	struct ath_mci_buf *buf = &mci->sched_buf;
+
+	buf->bf_addr = dma_alloc_coherent(sc->dev,
+				  ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE,
+				  &buf->bf_paddr, GFP_KERNEL);
+
+	if (buf->bf_addr == NULL) {
+		ath_dbg(common, FATAL, "MCI buffer alloc failed\n");
+		return -ENOMEM;
+	}
+
+	memset(buf->bf_addr, MCI_GPM_RSVD_PATTERN,
+	       ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE);
+
+	mci->sched_buf.bf_len = ATH_MCI_SCHED_BUF_SIZE;
+
+	mci->gpm_buf.bf_len = ATH_MCI_GPM_BUF_SIZE;
+	mci->gpm_buf.bf_addr = (u8 *)mci->sched_buf.bf_addr + mci->sched_buf.bf_len;
+	mci->gpm_buf.bf_paddr = mci->sched_buf.bf_paddr + mci->sched_buf.bf_len;
+
+	ar9003_mci_setup(sc->sc_ah, mci->gpm_buf.bf_paddr,
+			 mci->gpm_buf.bf_addr, (mci->gpm_buf.bf_len >> 4),
+			 mci->sched_buf.bf_paddr);
+
+	ath_dbg(common, MCI, "MCI Initialized\n");
+
+	return 0;
+}
+
+void ath_mci_cleanup(struct ath_softc *sc)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_mci_coex *mci = &sc->mci_coex;
+	struct ath_mci_buf *buf = &mci->sched_buf;
+
+	if (buf->bf_addr)
+		dma_free_coherent(sc->dev,
+				  ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE,
+				  buf->bf_addr, buf->bf_paddr);
+
+	ar9003_mci_cleanup(ah);
+
+	ath_dbg(common, MCI, "MCI De-Initialized\n");
+}
+
+void ath_mci_intr(struct ath_softc *sc)
+{
+	struct ath_mci_coex *mci = &sc->mci_coex;
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	u32 mci_int, mci_int_rxmsg;
+	u32 offset, subtype, opcode;
+	u32 *pgpm;
+	u32 more_data = MCI_GPM_MORE;
+	bool skip_gpm = false;
+
+	ar9003_mci_get_interrupt(sc->sc_ah, &mci_int, &mci_int_rxmsg);
+
+	if (ar9003_mci_state(ah, MCI_STATE_ENABLE, NULL) == 0) {
+		ar9003_mci_state(ah, MCI_STATE_INIT_GPM_OFFSET, NULL);
+		return;
+	}
+
+	if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_REQ_WAKE) {
+		u32 payload[4] = { 0xffffffff, 0xffffffff,
+				   0xffffffff, 0xffffff00};
+
+		/*
+		 * The following REMOTE_RESET and SYS_WAKING used to sent
+		 * only when BT wake up. Now they are always sent, as a
+		 * recovery method to reset BT MCI's RX alignment.
+		 */
+		ar9003_mci_send_message(ah, MCI_REMOTE_RESET, 0,
+					payload, 16, true, false);
+		ar9003_mci_send_message(ah, MCI_SYS_WAKING, 0,
+					NULL, 0, true, false);
+
+		mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_REQ_WAKE;
+		ar9003_mci_state(ah, MCI_STATE_RESET_REQ_WAKE, NULL);
+
+		/*
+		 * always do this for recovery and 2G/5G toggling and LNA_TRANS
+		 */
+		ar9003_mci_state(ah, MCI_STATE_SET_BT_AWAKE, NULL);
+	}
+
+	if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING) {
+		mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING;
+
+		if (ar9003_mci_state(ah, MCI_STATE_BT, NULL) == MCI_BT_SLEEP) {
+			if (ar9003_mci_state(ah, MCI_STATE_REMOTE_SLEEP, NULL) !=
+			    MCI_BT_SLEEP)
+				ar9003_mci_state(ah, MCI_STATE_SET_BT_AWAKE,
+						 NULL);
+		}
+	}
+
+	if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_SYS_SLEEPING) {
+		mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_SYS_SLEEPING;
+
+		if (ar9003_mci_state(ah, MCI_STATE_BT, NULL) == MCI_BT_AWAKE) {
+			if (ar9003_mci_state(ah, MCI_STATE_REMOTE_SLEEP, NULL) !=
+			    MCI_BT_AWAKE)
+				ar9003_mci_state(ah, MCI_STATE_SET_BT_SLEEP,
+						 NULL);
+		}
+	}
+
+	if ((mci_int & AR_MCI_INTERRUPT_RX_INVALID_HDR) ||
+	    (mci_int & AR_MCI_INTERRUPT_CONT_INFO_TIMEOUT)) {
+		ar9003_mci_state(ah, MCI_STATE_RECOVER_RX, NULL);
+		skip_gpm = true;
+	}
+
+	if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_SCHD_INFO) {
+		mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_SCHD_INFO;
+		offset = ar9003_mci_state(ah, MCI_STATE_LAST_SCHD_MSG_OFFSET,
+					  NULL);
+	}
+
+	if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_GPM) {
+		mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_GPM;
+
+		while (more_data == MCI_GPM_MORE) {
+
+			pgpm = mci->gpm_buf.bf_addr;
+			offset = ar9003_mci_state(ah, MCI_STATE_NEXT_GPM_OFFSET,
+						  &more_data);
+
+			if (offset == MCI_GPM_INVALID)
+				break;
+
+			pgpm += (offset >> 2);
+
+			/*
+			 * The first dword is timer.
+			 * The real data starts from 2nd dword.
+			 */
+			subtype = MCI_GPM_TYPE(pgpm);
+			opcode = MCI_GPM_OPCODE(pgpm);
+
+			if (skip_gpm)
+				goto recycle;
+
+			if (MCI_GPM_IS_CAL_TYPE(subtype)) {
+				ath_mci_cal_msg(sc, subtype, (u8 *)pgpm);
+			} else {
+				switch (subtype) {
+				case MCI_GPM_COEX_AGENT:
+					ath_mci_msg(sc, opcode, (u8 *)pgpm);
+					break;
+				default:
+					break;
+				}
+			}
+		recycle:
+			MCI_GPM_RECYCLE(pgpm);
+		}
+	}
+
+	if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_HW_MSG_MASK) {
+		if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_LNA_CONTROL)
+			mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_LNA_CONTROL;
+
+		if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_LNA_INFO)
+			mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_LNA_INFO;
+
+		if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_CONT_INFO) {
+			int value_dbm = ar9003_mci_state(ah,
+						 MCI_STATE_CONT_RSSI_POWER, NULL);
+
+			mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_CONT_INFO;
+
+			if (ar9003_mci_state(ah, MCI_STATE_CONT_TXRX, NULL))
+				ath_dbg(common, MCI,
+					"MCI CONT_INFO: (tx) pri = %d, pwr = %d dBm\n",
+					ar9003_mci_state(ah,
+						 MCI_STATE_CONT_PRIORITY, NULL),
+					value_dbm);
+			else
+				ath_dbg(common, MCI,
+					"MCI CONT_INFO: (rx) pri = %d,pwr = %d dBm\n",
+					ar9003_mci_state(ah,
+						 MCI_STATE_CONT_PRIORITY, NULL),
+					value_dbm);
+		}
+
+		if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_CONT_NACK)
+			mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_CONT_NACK;
+
+		if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_CONT_RST)
+			mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_CONT_RST;
+	}
+
+	if ((mci_int & AR_MCI_INTERRUPT_RX_INVALID_HDR) ||
+	    (mci_int & AR_MCI_INTERRUPT_CONT_INFO_TIMEOUT))
+		mci_int &= ~(AR_MCI_INTERRUPT_RX_INVALID_HDR |
+			     AR_MCI_INTERRUPT_CONT_INFO_TIMEOUT);
+}