gpio.c

  1/*
  2 * Copyright (c) 2008-2011 Atheros Communications Inc.
  3 *
  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.
  7 *
  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.
 15 */
 16
 17#include "ath9k.h"
 18
 19/********************************/
 20/*	 LED functions		*/
 21/********************************/
 22
 23#ifdef CONFIG_MAC80211_LEDS
 24
 25static void ath_fill_led_pin(struct ath_softc *sc)
 26{
 27	struct ath_hw *ah = sc->sc_ah;
 28
 29	/* Set default led pin if invalid */
 30	if (ah->led_pin < 0) {
 31		if (AR_SREV_9287(ah))
 32			ah->led_pin = ATH_LED_PIN_9287;
 33		else if (AR_SREV_9485(ah))
 34			ah->led_pin = ATH_LED_PIN_9485;
 35		else if (AR_SREV_9300(ah))
 36			ah->led_pin = ATH_LED_PIN_9300;
 37		else if (AR_SREV_9462(ah) || AR_SREV_9565(ah))
 38			ah->led_pin = ATH_LED_PIN_9462;
 39		else
 40			ah->led_pin = ATH_LED_PIN_DEF;
 41	}
 42
 43	/* Configure gpio for output */
 44	ath9k_hw_gpio_request_out(ah, ah->led_pin, "ath9k-led",
 45				  AR_GPIO_OUTPUT_MUX_AS_OUTPUT);
 46
 47	/* LED off, active low */
 48	ath9k_hw_set_gpio(ah, ah->led_pin, ah->config.led_active_high ? 0 : 1);
 49}
 50
 51static void ath_led_brightness(struct led_classdev *led_cdev,
 52			       enum led_brightness brightness)
 53{
 54	struct ath_softc *sc = container_of(led_cdev, struct ath_softc, led_cdev);
 55	u32 val = (brightness == LED_OFF);
 56
 57	if (sc->sc_ah->config.led_active_high)
 58		val = !val;
 59
 60	ath9k_hw_set_gpio(sc->sc_ah, sc->sc_ah->led_pin, val);
 61}
 62
 63void ath_deinit_leds(struct ath_softc *sc)
 64{
 65	if (!sc->led_registered)
 66		return;
 67
 68	ath_led_brightness(&sc->led_cdev, LED_OFF);
 69	led_classdev_unregister(&sc->led_cdev);
 70
 71	ath9k_hw_gpio_free(sc->sc_ah, sc->sc_ah->led_pin);
 72}
 73
 74void ath_init_leds(struct ath_softc *sc)
 75{
 76	int ret;
 77
 78	if (AR_SREV_9100(sc->sc_ah))
 79		return;
 80
 81	ath_fill_led_pin(sc);
 82
 83	if (!ath9k_led_blink)
 84		sc->led_cdev.default_trigger =
 85			ieee80211_get_radio_led_name(sc->hw);
 86
 87	snprintf(sc->led_name, sizeof(sc->led_name),
 88		"ath9k-%s", wiphy_name(sc->hw->wiphy));
 89	sc->led_cdev.name = sc->led_name;
 90	sc->led_cdev.brightness_set = ath_led_brightness;
 91
 92	ret = led_classdev_register(wiphy_dev(sc->hw->wiphy), &sc->led_cdev);
 93	if (ret < 0)
 94		return;
 95
 96	sc->led_registered = true;
 97}
 98#endif
 99
100/*******************/
101/*	Rfkill	   */
102/*******************/
103
104static bool ath_is_rfkill_set(struct ath_softc *sc)
105{
106	struct ath_hw *ah = sc->sc_ah;
107	bool is_blocked;
108
109	ath9k_ps_wakeup(sc);
110	is_blocked = ath9k_hw_gpio_get(ah, ah->rfkill_gpio) ==
111				  ah->rfkill_polarity;
112	ath9k_ps_restore(sc);
113
114	return is_blocked;
115}
116
117void ath9k_rfkill_poll_state(struct ieee80211_hw *hw)
118{
119	struct ath_softc *sc = hw->priv;
120	bool blocked = !!ath_is_rfkill_set(sc);
121
122	wiphy_rfkill_set_hw_state(hw->wiphy, blocked);
123}
124
125void ath_start_rfkill_poll(struct ath_softc *sc)
126{
127	struct ath_hw *ah = sc->sc_ah;
128
129	if (ah->caps.hw_caps & ATH9K_HW_CAP_RFSILENT)
130		wiphy_rfkill_start_polling(sc->hw->wiphy);
131}
132
133#ifdef CONFIG_ATH9K_BTCOEX_SUPPORT
134
135/******************/
136/*     BTCOEX     */
137/******************/
138
139/*
140 * Detects if there is any priority bt traffic
141 */
142static void ath_detect_bt_priority(struct ath_softc *sc)
143{
144	struct ath_btcoex *btcoex = &sc->btcoex;
145	struct ath_hw *ah = sc->sc_ah;
146
147	if (ath9k_hw_gpio_get(sc->sc_ah, ah->btcoex_hw.btpriority_gpio))
148		btcoex->bt_priority_cnt++;
149
150	if (time_after(jiffies, btcoex->bt_priority_time +
151			msecs_to_jiffies(ATH_BT_PRIORITY_TIME_THRESHOLD))) {
152		clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
153		clear_bit(BT_OP_SCAN, &btcoex->op_flags);
154		/* Detect if colocated bt started scanning */
155		if (btcoex->bt_priority_cnt >= ATH_BT_CNT_SCAN_THRESHOLD) {
156			ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
157				"BT scan detected\n");
158			set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
159			set_bit(BT_OP_SCAN, &btcoex->op_flags);
160		} else if (btcoex->bt_priority_cnt >= ATH_BT_CNT_THRESHOLD) {
161			ath_dbg(ath9k_hw_common(sc->sc_ah), BTCOEX,
162				"BT priority traffic detected\n");
163			set_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
164		}
165
166		btcoex->bt_priority_cnt = 0;
167		btcoex->bt_priority_time = jiffies;
168	}
169}
170
171static void ath_mci_ftp_adjust(struct ath_softc *sc)
172{
173	struct ath_btcoex *btcoex = &sc->btcoex;
174	struct ath_mci_profile *mci = &btcoex->mci;
175	struct ath_hw *ah = sc->sc_ah;
176
177	if (btcoex->bt_wait_time > ATH_BTCOEX_RX_WAIT_TIME) {
178		if (ar9003_mci_state(ah, MCI_STATE_NEED_FTP_STOMP) &&
179		    (mci->num_pan || mci->num_other_acl))
180			ah->btcoex_hw.mci.stomp_ftp =
181				(sc->rx.num_pkts < ATH_BTCOEX_STOMP_FTP_THRESH);
182		else
183			ah->btcoex_hw.mci.stomp_ftp = false;
184		btcoex->bt_wait_time = 0;
185		sc->rx.num_pkts = 0;
186	}
187}
188
189/*
190 * This is the master bt coex timer which runs for every
191 * 45ms, bt traffic will be given priority during 55% of this
192 * period while wlan gets remaining 45%
193 */
194static void ath_btcoex_period_timer(struct timer_list *t)
195{
196	struct ath_softc *sc = timer_container_of(sc, t, btcoex.period_timer);
197	struct ath_hw *ah = sc->sc_ah;
198	struct ath_btcoex *btcoex = &sc->btcoex;
199	enum ath_stomp_type stomp_type;
200	u32 timer_period;
201	unsigned long flags;
202
203	spin_lock_irqsave(&sc->sc_pm_lock, flags);
204	if (sc->sc_ah->power_mode == ATH9K_PM_NETWORK_SLEEP) {
205		btcoex->bt_wait_time += btcoex->btcoex_period;
206		spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
207		goto skip_hw_wakeup;
208	}
209	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
210
211	ath9k_ps_wakeup(sc);
212	spin_lock_bh(&btcoex->btcoex_lock);
213
214	if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI) {
215		ath9k_mci_update_rssi(sc);
216		ath_mci_ftp_adjust(sc);
217	}
218
219	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
220		ath_detect_bt_priority(sc);
221
222	stomp_type = btcoex->bt_stomp_type;
223	timer_period = btcoex->btcoex_no_stomp;
224
225	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI)) {
226		if (test_bit(BT_OP_SCAN, &btcoex->op_flags)) {
227			stomp_type = ATH_BTCOEX_STOMP_ALL;
228			timer_period = btcoex->btscan_no_stomp;
229		}
230	} else if (btcoex->stomp_audio >= 5) {
231		stomp_type = ATH_BTCOEX_STOMP_AUDIO;
232		btcoex->stomp_audio = 0;
233	}
234
235	ath9k_hw_btcoex_bt_stomp(ah, stomp_type);
236	ath9k_hw_btcoex_enable(ah);
237
238	spin_unlock_bh(&btcoex->btcoex_lock);
239
240	if (btcoex->btcoex_period != btcoex->btcoex_no_stomp)
241		mod_timer(&btcoex->no_stomp_timer,
242			 jiffies + msecs_to_jiffies(timer_period));
243
244	ath9k_ps_restore(sc);
245
246skip_hw_wakeup:
247	mod_timer(&btcoex->period_timer,
248		  jiffies + msecs_to_jiffies(btcoex->btcoex_period));
249}
250
251/*
252 * Generic tsf based hw timer which configures weight
253 * registers to time slice between wlan and bt traffic
254 */
255static void ath_btcoex_no_stomp_timer(struct timer_list *t)
256{
257	struct ath_softc *sc = timer_container_of(sc, t,
258						  btcoex.no_stomp_timer);
259	struct ath_hw *ah = sc->sc_ah;
260	struct ath_btcoex *btcoex = &sc->btcoex;
261
262	ath9k_ps_wakeup(sc);
263	spin_lock_bh(&btcoex->btcoex_lock);
264
265	if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_LOW ||
266	    (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI) &&
267	     test_bit(BT_OP_SCAN, &btcoex->op_flags)))
268		ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_NONE);
269	else if (btcoex->bt_stomp_type == ATH_BTCOEX_STOMP_ALL)
270		ath9k_hw_btcoex_bt_stomp(ah, ATH_BTCOEX_STOMP_LOW);
271
272	ath9k_hw_btcoex_enable(ah);
273	spin_unlock_bh(&btcoex->btcoex_lock);
274	ath9k_ps_restore(sc);
275}
276
277static void ath_init_btcoex_timer(struct ath_softc *sc)
278{
279	struct ath_btcoex *btcoex = &sc->btcoex;
280
281	btcoex->btcoex_period = ATH_BTCOEX_DEF_BT_PERIOD;
282	btcoex->btcoex_no_stomp = (100 - ATH_BTCOEX_DEF_DUTY_CYCLE) *
283		btcoex->btcoex_period / 100;
284	btcoex->btscan_no_stomp = (100 - ATH_BTCOEX_BTSCAN_DUTY_CYCLE) *
285				   btcoex->btcoex_period / 100;
286	btcoex->bt_stomp_type = ATH_BTCOEX_STOMP_LOW;
287
288	timer_setup(&btcoex->period_timer, ath_btcoex_period_timer, 0);
289	timer_setup(&btcoex->no_stomp_timer, ath_btcoex_no_stomp_timer, 0);
290
291	spin_lock_init(&btcoex->btcoex_lock);
292}
293
294/*
295 * (Re)start btcoex timers
296 */
297void ath9k_btcoex_timer_resume(struct ath_softc *sc)
298{
299	struct ath_btcoex *btcoex = &sc->btcoex;
300	struct ath_hw *ah = sc->sc_ah;
301
302	if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_3WIRE &&
303	    ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_MCI)
304		return;
305
306	ath_dbg(ath9k_hw_common(ah), BTCOEX, "Starting btcoex timers\n");
307
308	/* make sure duty cycle timer is also stopped when resuming */
309	timer_delete_sync(&btcoex->no_stomp_timer);
310
311	btcoex->bt_priority_cnt = 0;
312	btcoex->bt_priority_time = jiffies;
313	clear_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags);
314	clear_bit(BT_OP_SCAN, &btcoex->op_flags);
315
316	mod_timer(&btcoex->period_timer, jiffies);
317}
318
319/*
320 * Pause btcoex timer and bt duty cycle timer
321 */
322void ath9k_btcoex_timer_pause(struct ath_softc *sc)
323{
324	struct ath_btcoex *btcoex = &sc->btcoex;
325	struct ath_hw *ah = sc->sc_ah;
326
327	if (ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_3WIRE &&
328	    ath9k_hw_get_btcoex_scheme(ah) != ATH_BTCOEX_CFG_MCI)
329		return;
330
331	ath_dbg(ath9k_hw_common(ah), BTCOEX, "Stopping btcoex timers\n");
332
333	timer_delete_sync(&btcoex->period_timer);
334	timer_delete_sync(&btcoex->no_stomp_timer);
335}
336
337void ath9k_btcoex_stop_gen_timer(struct ath_softc *sc)
338{
339	struct ath_btcoex *btcoex = &sc->btcoex;
340
341	timer_delete_sync(&btcoex->no_stomp_timer);
342}
343
344u16 ath9k_btcoex_aggr_limit(struct ath_softc *sc, u32 max_4ms_framelen)
345{
346	struct ath_btcoex *btcoex = &sc->btcoex;
347	struct ath_mci_profile *mci = &sc->btcoex.mci;
348	u16 aggr_limit = 0;
349
350	if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_MCI) && mci->aggr_limit)
351		aggr_limit = (max_4ms_framelen * mci->aggr_limit) >> 4;
352	else if (test_bit(BT_OP_PRIORITY_DETECTED, &btcoex->op_flags))
353		aggr_limit = min((max_4ms_framelen * 3) / 8,
354				 (u32)ATH_AMPDU_LIMIT_MAX);
355
356	return aggr_limit;
357}
358
359void ath9k_btcoex_handle_interrupt(struct ath_softc *sc, u32 status)
360{
361	if (status & ATH9K_INT_MCI)
362		ath_mci_intr(sc);
363}
364
365void ath9k_start_btcoex(struct ath_softc *sc)
366{
367	struct ath_hw *ah = sc->sc_ah;
368
369	if (ah->btcoex_hw.enabled ||
370	    ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
371		return;
372
373	if (!(ah->caps.hw_caps & ATH9K_HW_CAP_MCI))
374		ath9k_hw_btcoex_set_weight(ah, AR_BT_COEX_WGHT,
375					   AR_STOMP_LOW_WLAN_WGHT, 0);
376	else
377		ath9k_hw_btcoex_set_weight(ah, 0, 0,
378					   ATH_BTCOEX_STOMP_NONE);
379	ath9k_hw_btcoex_enable(ah);
380	ath9k_btcoex_timer_resume(sc);
381}
382
383void ath9k_stop_btcoex(struct ath_softc *sc)
384{
385	struct ath_hw *ah = sc->sc_ah;
386
387	if (!ah->btcoex_hw.enabled ||
388	    ath9k_hw_get_btcoex_scheme(ah) == ATH_BTCOEX_CFG_NONE)
389		return;
390
391	ath9k_btcoex_timer_pause(sc);
392	ath9k_hw_btcoex_disable(ah);
393
394	if (ah->caps.hw_caps & ATH9K_HW_CAP_MCI)
395		ath_mci_flush_profile(&sc->btcoex.mci);
396}
397
398void ath9k_deinit_btcoex(struct ath_softc *sc)
399{
400	struct ath_hw *ah = sc->sc_ah;
401
402	if (ath9k_hw_mci_is_enabled(ah))
403		ath_mci_cleanup(sc);
404	else {
405		enum ath_btcoex_scheme scheme = ath9k_hw_get_btcoex_scheme(ah);
406
407		if (scheme == ATH_BTCOEX_CFG_2WIRE ||
408		    scheme == ATH_BTCOEX_CFG_3WIRE)
409			ath9k_hw_btcoex_deinit(sc->sc_ah);
410	}
411}
412
413int ath9k_init_btcoex(struct ath_softc *sc)
414{
415	struct ath_txq *txq;
416	struct ath_hw *ah = sc->sc_ah;
417	int r;
418
419	ath9k_hw_btcoex_init_scheme(ah);
420
421	switch (ath9k_hw_get_btcoex_scheme(sc->sc_ah)) {
422	case ATH_BTCOEX_CFG_NONE:
423		break;
424	case ATH_BTCOEX_CFG_2WIRE:
425		ath9k_hw_btcoex_init_2wire(sc->sc_ah);
426		break;
427	case ATH_BTCOEX_CFG_3WIRE:
428		ath9k_hw_btcoex_init_3wire(sc->sc_ah);
429		ath_init_btcoex_timer(sc);
430		txq = sc->tx.txq_map[IEEE80211_AC_BE];
431		ath9k_hw_init_btcoex_hw(sc->sc_ah, txq->axq_qnum);
432		break;
433	case ATH_BTCOEX_CFG_MCI:
434		ath_init_btcoex_timer(sc);
435
436		sc->btcoex.duty_cycle = ATH_BTCOEX_DEF_DUTY_CYCLE;
437		INIT_LIST_HEAD(&sc->btcoex.mci.info);
438		ath9k_hw_btcoex_init_mci(ah);
439
440		r = ath_mci_setup(sc);
441		if (r)
442			return r;
443
444		break;
445	default:
446		WARN_ON(1);
447		break;
448	}
449
450	return 0;
451}
452
453static int ath9k_dump_mci_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
454{
455	struct ath_btcoex *btcoex = &sc->btcoex;
456	struct ath_mci_profile *mci = &btcoex->mci;
457	struct ath_hw *ah = sc->sc_ah;
458	struct ath_btcoex_hw *btcoex_hw = &ah->btcoex_hw;
459	u32 len = 0;
460	int i;
461
462	ATH_DUMP_BTCOEX("Total BT profiles", NUM_PROF(mci));
463	ATH_DUMP_BTCOEX("MGMT", mci->num_mgmt);
464	ATH_DUMP_BTCOEX("SCO", mci->num_sco);
465	ATH_DUMP_BTCOEX("A2DP", mci->num_a2dp);
466	ATH_DUMP_BTCOEX("HID", mci->num_hid);
467	ATH_DUMP_BTCOEX("PAN", mci->num_pan);
468	ATH_DUMP_BTCOEX("ACL", mci->num_other_acl);
469	ATH_DUMP_BTCOEX("BDR", mci->num_bdr);
470	ATH_DUMP_BTCOEX("Aggr. Limit", mci->aggr_limit);
471	ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
472	ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
473	ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
474	ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);
475	ATH_DUMP_BTCOEX("Concurrent Tx", btcoex_hw->mci.concur_tx);
476	ATH_DUMP_BTCOEX("Concurrent RSSI cnt", btcoex->rssi_count);
477
478	len += scnprintf(buf + len, size - len, "BT Weights: ");
479	for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
480		len += scnprintf(buf + len, size - len, "%08x ",
481				 btcoex_hw->bt_weight[i]);
482	len += scnprintf(buf + len, size - len, "\n");
483	len += scnprintf(buf + len, size - len, "WLAN Weights: ");
484	for (i = 0; i < AR9300_NUM_BT_WEIGHTS; i++)
485		len += scnprintf(buf + len, size - len, "%08x ",
486				 btcoex_hw->wlan_weight[i]);
487	len += scnprintf(buf + len, size - len, "\n");
488	len += scnprintf(buf + len, size - len, "Tx Priorities: ");
489	for (i = 0; i < ATH_BTCOEX_STOMP_MAX; i++)
490		len += scnprintf(buf + len, size - len, "%08x ",
491				btcoex_hw->tx_prio[i]);
492
493	len += scnprintf(buf + len, size - len, "\n");
494
495	return len;
496}
497
498static int ath9k_dump_legacy_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
499{
500
501	struct ath_btcoex *btcoex = &sc->btcoex;
502	u32 len = 0;
503
504	ATH_DUMP_BTCOEX("Stomp Type", btcoex->bt_stomp_type);
505	ATH_DUMP_BTCOEX("BTCoex Period (msec)", btcoex->btcoex_period);
506	ATH_DUMP_BTCOEX("Duty Cycle", btcoex->duty_cycle);
507	ATH_DUMP_BTCOEX("BT Wait time", btcoex->bt_wait_time);
508
509	return len;
510}
511
512int ath9k_dump_btcoex(struct ath_softc *sc, u8 *buf, u32 size)
513{
514	if (ath9k_hw_mci_is_enabled(sc->sc_ah))
515		return ath9k_dump_mci_btcoex(sc, buf, size);
516	else
517		return ath9k_dump_legacy_btcoex(sc, buf, size);
518}
519
520#endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */