2 * Copyright (c) 2010-2011 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.
17 #include <linux/dma-mapping.h>
18 #include <linux/slab.h>
23 static const u8 ath_mci_duty_cycle[] = { 55, 50, 60, 70, 80, 85, 90, 95, 98 };
25 static struct ath_mci_profile_info*
26 ath_mci_find_profile(struct ath_mci_profile *mci,
27 struct ath_mci_profile_info *info)
29 struct ath_mci_profile_info *entry;
31 if (list_empty(&mci->info))
34 list_for_each_entry(entry, &mci->info, list) {
35 if (entry->conn_handle == info->conn_handle)
41 static bool ath_mci_add_profile(struct ath_common *common,
42 struct ath_mci_profile *mci,
43 struct ath_mci_profile_info *info)
45 struct ath_mci_profile_info *entry;
47 if ((mci->num_sco == ATH_MCI_MAX_SCO_PROFILE) &&
48 (info->type == MCI_GPM_COEX_PROFILE_VOICE))
51 if (((NUM_PROF(mci) - mci->num_sco) == ATH_MCI_MAX_ACL_PROFILE) &&
52 (info->type != MCI_GPM_COEX_PROFILE_VOICE))
55 entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
59 memcpy(entry, info, 10);
61 list_add_tail(&entry->list, &mci->info);
66 static void ath_mci_del_profile(struct ath_common *common,
67 struct ath_mci_profile *mci,
68 struct ath_mci_profile_info *entry)
74 list_del(&entry->list);
78 void ath_mci_flush_profile(struct ath_mci_profile *mci)
80 struct ath_mci_profile_info *info, *tinfo;
85 if (list_empty(&mci->info))
88 list_for_each_entry_safe(info, tinfo, &mci->info, list) {
89 list_del(&info->list);
95 static void ath_mci_adjust_aggr_limit(struct ath_btcoex *btcoex)
97 struct ath_mci_profile *mci = &btcoex->mci;
98 u32 wlan_airtime = btcoex->btcoex_period *
99 (100 - btcoex->duty_cycle) / 100;
102 * Scale: wlan_airtime is in ms, aggr_limit is in 0.25 ms.
103 * When wlan_airtime is less than 4ms, aggregation limit has to be
104 * adjusted half of wlan_airtime to ensure that the aggregation can fit
105 * without collision with BT traffic.
107 if ((wlan_airtime <= 4) &&
108 (!mci->aggr_limit || (mci->aggr_limit > (2 * wlan_airtime))))
109 mci->aggr_limit = 2 * wlan_airtime;
112 static void ath_mci_update_scheme(struct ath_softc *sc)
114 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
115 struct ath_btcoex *btcoex = &sc->btcoex;
116 struct ath_mci_profile *mci = &btcoex->mci;
117 struct ath9k_hw_mci *mci_hw = &sc->sc_ah->btcoex_hw.mci;
118 struct ath_mci_profile_info *info;
119 u32 num_profile = NUM_PROF(mci);
121 if (mci_hw->config & ATH_MCI_CONFIG_DISABLE_TUNING)
125 btcoex->duty_cycle = ath_mci_duty_cycle[num_profile];
126 btcoex->btcoex_period = ATH_MCI_DEF_BT_PERIOD;
128 btcoex->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
130 btcoex->bt_stomp_type = mci->num_mgmt ? ATH_BTCOEX_STOMP_ALL :
131 ATH_BTCOEX_STOMP_LOW;
133 if (num_profile == 1) {
134 info = list_first_entry(&mci->info,
135 struct ath_mci_profile_info,
140 else if (info->T == 6) {
142 btcoex->duty_cycle = 30;
146 "Single SCO, aggregation limit %d 1/4 ms\n",
148 } else if (mci->num_pan || mci->num_other_acl) {
150 * For single PAN/FTP profile, allocate 35% for BT
151 * to improve WLAN throughput.
153 btcoex->duty_cycle = 35;
154 btcoex->btcoex_period = 53;
156 "Single PAN/FTP bt period %d ms dutycycle %d\n",
157 btcoex->duty_cycle, btcoex->btcoex_period);
158 } else if (mci->num_hid) {
159 btcoex->duty_cycle = 30;
162 "Multiple attempt/timeout single HID "
163 "aggregation limit 1.5 ms dutycycle 30%%\n");
165 } else if (num_profile == 2) {
166 if (mci->num_hid == 2)
167 btcoex->duty_cycle = 30;
170 "Two BT profiles aggr limit 1.5 ms dutycycle %d%%\n",
172 } else if (num_profile >= 3) {
175 "Three or more profiles aggregation limit 1 ms\n");
179 if (IS_CHAN_2GHZ(sc->sc_ah->curchan)) {
180 if (IS_CHAN_HT(sc->sc_ah->curchan))
181 ath_mci_adjust_aggr_limit(btcoex);
183 btcoex->btcoex_period >>= 1;
186 ath9k_btcoex_timer_pause(sc);
187 ath9k_hw_btcoex_disable(sc->sc_ah);
189 if (IS_CHAN_5GHZ(sc->sc_ah->curchan))
192 btcoex->duty_cycle += (mci->num_bdr ? ATH_MCI_BDR_DUTY_CYCLE : 0);
193 if (btcoex->duty_cycle > ATH_MCI_MAX_DUTY_CYCLE)
194 btcoex->duty_cycle = ATH_MCI_MAX_DUTY_CYCLE;
196 btcoex->btcoex_no_stomp = btcoex->btcoex_period * 1000 *
197 (100 - btcoex->duty_cycle) / 100;
199 ath9k_hw_btcoex_enable(sc->sc_ah);
200 ath9k_btcoex_timer_resume(sc);
203 static void ath_mci_wait_btcal_done(struct ath_softc *sc)
205 struct ath_hw *ah = sc->sc_ah;
208 ieee80211_stop_queues(sc->hw);
210 ath_drain_all_txq(sc, false);
212 /* Wait for cal done */
213 ar9003_mci_start_reset(ah, ah->curchan);
217 ieee80211_wake_queues(sc->hw);
220 static void ath_mci_cal_msg(struct ath_softc *sc, u8 opcode, u8 *rx_payload)
222 struct ath_hw *ah = sc->sc_ah;
223 struct ath_common *common = ath9k_hw_common(ah);
224 struct ath9k_hw_mci *mci_hw = &ah->btcoex_hw.mci;
225 u32 payload[4] = {0, 0, 0, 0};
228 case MCI_GPM_BT_CAL_REQ:
229 if (mci_hw->bt_state == MCI_BT_AWAKE) {
230 mci_hw->bt_state = MCI_BT_CAL_START;
231 ath_mci_wait_btcal_done(sc);
233 ath_dbg(common, MCI, "MCI State : %d\n", mci_hw->bt_state);
235 case MCI_GPM_BT_CAL_GRANT:
236 MCI_GPM_SET_CAL_TYPE(payload, MCI_GPM_WLAN_CAL_DONE);
237 ar9003_mci_send_message(sc->sc_ah, MCI_GPM, 0, payload,
241 ath_dbg(common, MCI, "Unknown GPM CAL message\n");
246 static void ath9k_mci_work(struct work_struct *work)
248 struct ath_softc *sc = container_of(work, struct ath_softc, mci_work);
250 ath_mci_update_scheme(sc);
253 static u8 ath_mci_process_profile(struct ath_softc *sc,
254 struct ath_mci_profile_info *info)
256 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
257 struct ath_btcoex *btcoex = &sc->btcoex;
258 struct ath_mci_profile *mci = &btcoex->mci;
259 struct ath_mci_profile_info *entry = NULL;
261 entry = ath_mci_find_profile(mci, info);
264 * Two MCI interrupts are generated while connecting to
265 * headset and A2DP profile, but only one MCI interrupt
266 * is generated with last added profile type while disconnecting
268 * So while adding second profile type decrement
271 if (entry->type != info->type) {
272 DEC_PROF(mci, entry);
275 memcpy(entry, info, 10);
279 if (!entry && !ath_mci_add_profile(common, mci, info))
282 ath_mci_del_profile(common, mci, entry);
287 static u8 ath_mci_process_status(struct ath_softc *sc,
288 struct ath_mci_profile_status *status)
290 struct ath_btcoex *btcoex = &sc->btcoex;
291 struct ath_mci_profile *mci = &btcoex->mci;
292 struct ath_mci_profile_info info;
293 int i = 0, old_num_mgmt = mci->num_mgmt;
295 /* Link status type are not handled */
299 info.conn_handle = status->conn_handle;
300 if (ath_mci_find_profile(mci, &info))
303 if (status->conn_handle >= ATH_MCI_MAX_PROFILE)
306 if (status->is_critical)
307 __set_bit(status->conn_handle, mci->status);
309 __clear_bit(status->conn_handle, mci->status);
313 if (test_bit(i, mci->status))
315 } while (++i < ATH_MCI_MAX_PROFILE);
317 if (old_num_mgmt != mci->num_mgmt)
323 static void ath_mci_msg(struct ath_softc *sc, u8 opcode, u8 *rx_payload)
325 struct ath_hw *ah = sc->sc_ah;
326 struct ath_mci_profile_info profile_info;
327 struct ath_mci_profile_status profile_status;
328 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
329 u8 major, minor, update_scheme = 0;
332 if (ar9003_mci_state(ah, MCI_STATE_NEED_FLUSH_BT_INFO) &&
333 ar9003_mci_state(ah, MCI_STATE_ENABLE)) {
334 ath_dbg(common, MCI, "(MCI) Need to flush BT profiles\n");
335 ath_mci_flush_profile(&sc->btcoex.mci);
336 ar9003_mci_state(ah, MCI_STATE_SEND_STATUS_QUERY);
340 case MCI_GPM_COEX_VERSION_QUERY:
341 ar9003_mci_state(ah, MCI_STATE_SEND_WLAN_COEX_VERSION);
343 case MCI_GPM_COEX_VERSION_RESPONSE:
344 major = *(rx_payload + MCI_GPM_COEX_B_MAJOR_VERSION);
345 minor = *(rx_payload + MCI_GPM_COEX_B_MINOR_VERSION);
346 ar9003_mci_set_bt_version(ah, major, minor);
348 case MCI_GPM_COEX_STATUS_QUERY:
349 ar9003_mci_send_wlan_channels(ah);
351 case MCI_GPM_COEX_BT_PROFILE_INFO:
352 memcpy(&profile_info,
353 (rx_payload + MCI_GPM_COEX_B_PROFILE_TYPE), 10);
355 if ((profile_info.type == MCI_GPM_COEX_PROFILE_UNKNOWN) ||
356 (profile_info.type >= MCI_GPM_COEX_PROFILE_MAX)) {
358 "Illegal profile type = %d, state = %d\n",
364 update_scheme += ath_mci_process_profile(sc, &profile_info);
366 case MCI_GPM_COEX_BT_STATUS_UPDATE:
367 profile_status.is_link = *(rx_payload +
368 MCI_GPM_COEX_B_STATUS_TYPE);
369 profile_status.conn_handle = *(rx_payload +
370 MCI_GPM_COEX_B_STATUS_LINKID);
371 profile_status.is_critical = *(rx_payload +
372 MCI_GPM_COEX_B_STATUS_STATE);
374 seq_num = *((u32 *)(rx_payload + 12));
376 "BT_Status_Update: is_link=%d, linkId=%d, state=%d, SEQ=%u\n",
377 profile_status.is_link, profile_status.conn_handle,
378 profile_status.is_critical, seq_num);
380 update_scheme += ath_mci_process_status(sc, &profile_status);
383 ath_dbg(common, MCI, "Unknown GPM COEX message = 0x%02x\n", opcode);
387 ieee80211_queue_work(sc->hw, &sc->mci_work);
390 int ath_mci_setup(struct ath_softc *sc)
392 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
393 struct ath_mci_coex *mci = &sc->mci_coex;
394 struct ath_mci_buf *buf = &mci->sched_buf;
397 buf->bf_addr = dma_alloc_coherent(sc->dev,
398 ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE,
399 &buf->bf_paddr, GFP_KERNEL);
401 if (buf->bf_addr == NULL) {
402 ath_dbg(common, FATAL, "MCI buffer alloc failed\n");
406 memset(buf->bf_addr, MCI_GPM_RSVD_PATTERN,
407 ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE);
409 mci->sched_buf.bf_len = ATH_MCI_SCHED_BUF_SIZE;
411 mci->gpm_buf.bf_len = ATH_MCI_GPM_BUF_SIZE;
412 mci->gpm_buf.bf_addr = (u8 *)mci->sched_buf.bf_addr + mci->sched_buf.bf_len;
413 mci->gpm_buf.bf_paddr = mci->sched_buf.bf_paddr + mci->sched_buf.bf_len;
415 ret = ar9003_mci_setup(sc->sc_ah, mci->gpm_buf.bf_paddr,
416 mci->gpm_buf.bf_addr, (mci->gpm_buf.bf_len >> 4),
417 mci->sched_buf.bf_paddr);
419 ath_err(common, "Failed to initialize MCI\n");
423 INIT_WORK(&sc->mci_work, ath9k_mci_work);
424 ath_dbg(common, MCI, "MCI Initialized\n");
429 void ath_mci_cleanup(struct ath_softc *sc)
431 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
432 struct ath_hw *ah = sc->sc_ah;
433 struct ath_mci_coex *mci = &sc->mci_coex;
434 struct ath_mci_buf *buf = &mci->sched_buf;
437 dma_free_coherent(sc->dev,
438 ATH_MCI_SCHED_BUF_SIZE + ATH_MCI_GPM_BUF_SIZE,
439 buf->bf_addr, buf->bf_paddr);
441 ar9003_mci_cleanup(ah);
443 ath_dbg(common, MCI, "MCI De-Initialized\n");
446 void ath_mci_intr(struct ath_softc *sc)
448 struct ath_mci_coex *mci = &sc->mci_coex;
449 struct ath_hw *ah = sc->sc_ah;
450 struct ath_common *common = ath9k_hw_common(ah);
451 struct ath9k_hw_mci *mci_hw = &ah->btcoex_hw.mci;
452 u32 mci_int, mci_int_rxmsg;
453 u32 offset, subtype, opcode;
455 u32 more_data = MCI_GPM_MORE;
456 bool skip_gpm = false;
458 ar9003_mci_get_interrupt(sc->sc_ah, &mci_int, &mci_int_rxmsg);
460 if (ar9003_mci_state(ah, MCI_STATE_ENABLE) == 0) {
461 ar9003_mci_get_next_gpm_offset(ah, true, NULL);
465 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_REQ_WAKE) {
466 u32 payload[4] = { 0xffffffff, 0xffffffff,
467 0xffffffff, 0xffffff00};
470 * The following REMOTE_RESET and SYS_WAKING used to sent
471 * only when BT wake up. Now they are always sent, as a
472 * recovery method to reset BT MCI's RX alignment.
474 ar9003_mci_send_message(ah, MCI_REMOTE_RESET, 0,
475 payload, 16, true, false);
476 ar9003_mci_send_message(ah, MCI_SYS_WAKING, 0,
477 NULL, 0, true, false);
479 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_REQ_WAKE;
480 ar9003_mci_state(ah, MCI_STATE_RESET_REQ_WAKE);
483 * always do this for recovery and 2G/5G toggling and LNA_TRANS
485 ar9003_mci_state(ah, MCI_STATE_SET_BT_AWAKE);
488 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING) {
489 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_SYS_WAKING;
491 if ((mci_hw->bt_state == MCI_BT_SLEEP) &&
492 (ar9003_mci_state(ah, MCI_STATE_REMOTE_SLEEP) !=
494 ar9003_mci_state(ah, MCI_STATE_SET_BT_AWAKE);
497 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_SYS_SLEEPING) {
498 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_SYS_SLEEPING;
500 if ((mci_hw->bt_state == MCI_BT_AWAKE) &&
501 (ar9003_mci_state(ah, MCI_STATE_REMOTE_SLEEP) !=
503 mci_hw->bt_state = MCI_BT_SLEEP;
506 if ((mci_int & AR_MCI_INTERRUPT_RX_INVALID_HDR) ||
507 (mci_int & AR_MCI_INTERRUPT_CONT_INFO_TIMEOUT)) {
508 ar9003_mci_state(ah, MCI_STATE_RECOVER_RX);
512 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_SCHD_INFO) {
513 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_SCHD_INFO;
514 offset = ar9003_mci_state(ah, MCI_STATE_LAST_SCHD_MSG_OFFSET);
517 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_GPM) {
518 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_GPM;
520 while (more_data == MCI_GPM_MORE) {
522 pgpm = mci->gpm_buf.bf_addr;
523 offset = ar9003_mci_get_next_gpm_offset(ah, false,
526 if (offset == MCI_GPM_INVALID)
529 pgpm += (offset >> 2);
532 * The first dword is timer.
533 * The real data starts from 2nd dword.
535 subtype = MCI_GPM_TYPE(pgpm);
536 opcode = MCI_GPM_OPCODE(pgpm);
541 if (MCI_GPM_IS_CAL_TYPE(subtype)) {
542 ath_mci_cal_msg(sc, subtype, (u8 *)pgpm);
545 case MCI_GPM_COEX_AGENT:
546 ath_mci_msg(sc, opcode, (u8 *)pgpm);
553 MCI_GPM_RECYCLE(pgpm);
557 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_HW_MSG_MASK) {
558 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_LNA_CONTROL)
559 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_LNA_CONTROL;
561 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_LNA_INFO)
562 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_LNA_INFO;
564 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_CONT_INFO) {
565 int value_dbm = MS(mci_hw->cont_status,
566 AR_MCI_CONT_RSSI_POWER);
568 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_CONT_INFO;
571 "MCI CONT_INFO: (%s) pri = %d pwr = %d dBm\n",
572 MS(mci_hw->cont_status, AR_MCI_CONT_TXRX) ?
574 MS(mci_hw->cont_status, AR_MCI_CONT_PRIORITY),
578 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_CONT_NACK)
579 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_CONT_NACK;
581 if (mci_int_rxmsg & AR_MCI_INTERRUPT_RX_MSG_CONT_RST)
582 mci_int_rxmsg &= ~AR_MCI_INTERRUPT_RX_MSG_CONT_RST;
585 if ((mci_int & AR_MCI_INTERRUPT_RX_INVALID_HDR) ||
586 (mci_int & AR_MCI_INTERRUPT_CONT_INFO_TIMEOUT)) {
587 mci_int &= ~(AR_MCI_INTERRUPT_RX_INVALID_HDR |
588 AR_MCI_INTERRUPT_CONT_INFO_TIMEOUT);
589 ath_mci_msg(sc, MCI_GPM_COEX_NOOP, NULL);
593 void ath_mci_enable(struct ath_softc *sc)
595 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
597 if (!common->btcoex_enabled)
600 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI)
601 sc->sc_ah->imask |= ATH9K_INT_MCI;