aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/ath/ath9k/link.c
blob: aed7e29dc50f152b954278020b8b2999f3e795e7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
/*
 * Copyright (c) 2012 Qualcomm Atheros, 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"

/*
 * TX polling - checks if the TX engine is stuck somewhere
 * and issues a chip reset if so.
 */
void ath_tx_complete_poll_work(struct work_struct *work)
{
	struct ath_softc *sc = container_of(work, struct ath_softc,
					    tx_complete_work.work);
	struct ath_txq *txq;
	int i;
	bool needreset = false;


	if (sc->tx99_state) {
		ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
			"skip tx hung detection on tx99\n");
		return;
	}

	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
		txq = sc->tx.txq_map[i];

		ath_txq_lock(sc, txq);
		if (txq->axq_depth) {
			if (txq->axq_tx_inprogress) {
				needreset = true;
				ath_txq_unlock(sc, txq);
				break;
			} else {
				txq->axq_tx_inprogress = true;
			}
		}
		ath_txq_unlock(sc, txq);
	}

	if (needreset) {
		ath_dbg(ath9k_hw_common(sc->sc_ah), RESET,
			"tx hung, resetting the chip\n");
		ath9k_queue_reset(sc, RESET_TYPE_TX_HANG);
		return;
	}

	ieee80211_queue_delayed_work(sc->hw, &sc->tx_complete_work,
				     msecs_to_jiffies(ATH_TX_COMPLETE_POLL_INT));
}

/*
 * Checks if the BB/MAC is hung.
 */
void ath_hw_check(struct work_struct *work)
{
	struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
	unsigned long flags;
	int busy;
	u8 is_alive, nbeacon = 1;
	enum ath_reset_type type;

	ath9k_ps_wakeup(sc);
	is_alive = ath9k_hw_check_alive(sc->sc_ah);

	if ((is_alive && !AR_SREV_9300(sc->sc_ah)) || sc->tx99_state)
		goto out;
	else if (!is_alive && AR_SREV_9300(sc->sc_ah)) {
		ath_dbg(common, RESET,
			"DCU stuck is detected. Schedule chip reset\n");
		type = RESET_TYPE_MAC_HANG;
		goto sched_reset;
	}

	spin_lock_irqsave(&common->cc_lock, flags);
	busy = ath_update_survey_stats(sc);
	spin_unlock_irqrestore(&common->cc_lock, flags);

	ath_dbg(common, RESET, "Possible baseband hang, busy=%d (try %d)\n",
		busy, sc->hw_busy_count + 1);
	if (busy >= 99) {
		if (++sc->hw_busy_count >= 3) {
			type = RESET_TYPE_BB_HANG;
			goto sched_reset;
		}
	} else if (busy >= 0) {
		sc->hw_busy_count = 0;
		nbeacon = 3;
	}

	ath_start_rx_poll(sc, nbeacon);
	goto out;

sched_reset:
	ath9k_queue_reset(sc, type);
out:
	ath9k_ps_restore(sc);
}

/*
 * PLL-WAR for AR9485/AR9340
 */
static bool ath_hw_pll_rx_hang_check(struct ath_softc *sc, u32 pll_sqsum)
{
	static int count;
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);

	if (pll_sqsum >= 0x40000) {
		count++;
		if (count == 3) {
			ath_dbg(common, RESET, "PLL WAR, resetting the chip\n");
			ath9k_queue_reset(sc, RESET_TYPE_PLL_HANG);
			count = 0;
			return true;
		}
	} else {
		count = 0;
	}

	return false;
}

void ath_hw_pll_work(struct work_struct *work)
{
	u32 pll_sqsum;
	struct ath_softc *sc = container_of(work, struct ath_softc,
					    hw_pll_work.work);
	/*
	 * ensure that the PLL WAR is executed only
	 * after the STA is associated (or) if the
	 * beaconing had started in interfaces that
	 * uses beacons.
	 */
	if (!test_bit(SC_OP_BEACONS, &sc->sc_flags))
		return;

	if (sc->tx99_state)
		return;

	ath9k_ps_wakeup(sc);
	pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah);
	ath9k_ps_restore(sc);
	if (ath_hw_pll_rx_hang_check(sc, pll_sqsum))
		return;

	ieee80211_queue_delayed_work(sc->hw, &sc->hw_pll_work,
				     msecs_to_jiffies(ATH_PLL_WORK_INTERVAL));
}

/*
 * RX Polling - monitors baseband hangs.
 */
void ath_start_rx_poll(struct ath_softc *sc, u8 nbeacon)
{
	if (!AR_SREV_9300(sc->sc_ah))
		return;

	if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
		return;

	mod_timer(&sc->rx_poll_timer, jiffies + msecs_to_jiffies
		  (nbeacon * sc->cur_beacon_conf.beacon_interval));
}

void ath_rx_poll(unsigned long data)
{
	struct ath_softc *sc = (struct ath_softc *)data;

	if (!test_bit(SC_OP_INVALID, &sc->sc_flags))
		ieee80211_queue_work(sc->hw, &sc->hw_check_work);
}

/*
 * PA Pre-distortion.
 */
static void ath_paprd_activate(struct ath_softc *sc)
{
	struct ath_hw *ah = sc->sc_ah;
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_hw_cal_data *caldata = ah->caldata;
	int chain;

	if (!caldata || !test_bit(PAPRD_DONE, &caldata->cal_flags)) {
		ath_dbg(common, CALIBRATE, "Failed to activate PAPRD\n");
		return;
	}

	ar9003_paprd_enable(ah, false);
	for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
		if (!(ah->txchainmask & BIT(chain)))
			continue;

		ar9003_paprd_populate_single_table(ah, caldata, chain);
	}

	ath_dbg(common, CALIBRATE, "Activating PAPRD\n");
	ar9003_paprd_enable(ah, true);
}

static bool ath_paprd_send_frame(struct ath_softc *sc, struct sk_buff *skb, int chain)
{
	struct ieee80211_hw *hw = sc->hw;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	struct ath_hw *ah = sc->sc_ah;
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath_tx_control txctl;
	int time_left;

	memset(&txctl, 0, sizeof(txctl));
	txctl.txq = sc->tx.txq_map[IEEE80211_AC_BE];

	memset(tx_info, 0, sizeof(*tx_info));
	tx_info->band = hw->conf.chandef.chan->band;
	tx_info->flags |= IEEE80211_TX_CTL_NO_ACK;
	tx_info->control.rates[0].idx = 0;
	tx_info->control.rates[0].count = 1;
	tx_info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
	tx_info->control.rates[1].idx = -1;

	init_completion(&sc->paprd_complete);
	txctl.paprd = BIT(chain);

	if (ath_tx_start(hw, skb, &txctl) != 0) {
		ath_dbg(common, CALIBRATE, "PAPRD TX failed\n");
		dev_kfree_skb_any(skb);
		return false;
	}

	time_left = wait_for_completion_timeout(&sc->paprd_complete,
			msecs_to_jiffies(ATH_PAPRD_TIMEOUT));

	if (!time_left)
		ath_dbg(common, CALIBRATE,
			"Timeout waiting for paprd training on TX chain %d\n",
			chain);

	return !!time_left;
}

void ath_paprd_calibrate(struct work_struct *work)
{
	struct ath_softc *sc = container_of(work, struct ath_softc, paprd_work);
	struct ieee80211_hw *hw = sc->hw;
	struct ath_hw *ah = sc->sc_ah;
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb = NULL;
	struct ath9k_hw_cal_data *caldata = ah->caldata;
	struct ath_common *common = ath9k_hw_common(ah);
	int ftype;
	int chain_ok = 0;
	int chain;
	int len = 1800;
	int ret;

	if (!caldata ||
	    !test_bit(PAPRD_PACKET_SENT, &caldata->cal_flags) ||
	    test_bit(PAPRD_DONE, &caldata->cal_flags)) {
		ath_dbg(common, CALIBRATE, "Skipping PAPRD calibration\n");
		return;
	}

	ath9k_ps_wakeup(sc);

	if (ar9003_paprd_init_table(ah) < 0)
		goto fail_paprd;

	skb = alloc_skb(len, GFP_KERNEL);
	if (!skb)
		goto fail_paprd;

	skb_put(skb, len);
	memset(skb->data, 0, len);
	hdr = (struct ieee80211_hdr *)skb->data;
	ftype = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC;
	hdr->frame_control = cpu_to_le16(ftype);
	hdr->duration_id = cpu_to_le16(10);
	memcpy(hdr->addr1, hw->wiphy->perm_addr, ETH_ALEN);
	memcpy(hdr->addr2, hw->wiphy->perm_addr, ETH_ALEN);
	memcpy(hdr->addr3, hw->wiphy->perm_addr, ETH_ALEN);

	for (chain = 0; chain < AR9300_MAX_CHAINS; chain++) {
		if (!(ah->txchainmask & BIT(chain)))
			continue;

		chain_ok = 0;
		ar9003_paprd_setup_gain_table(ah, chain);

		ath_dbg(common, CALIBRATE,
			"Sending PAPRD training frame on chain %d\n", chain);
		if (!ath_paprd_send_frame(sc, skb, chain))
			goto fail_paprd;

		if (!ar9003_paprd_is_done(ah)) {
			ath_dbg(common, CALIBRATE,
				"PAPRD not yet done on chain %d\n", chain);
			break;
		}

		ret = ar9003_paprd_create_curve(ah, caldata, chain);
		if (ret == -EINPROGRESS) {
			ath_dbg(common, CALIBRATE,
				"PAPRD curve on chain %d needs to be re-trained\n",
				chain);
			break;
		} else if (ret) {
			ath_dbg(common, CALIBRATE,
				"PAPRD create curve failed on chain %d\n",
				chain);
			break;
		}

		chain_ok = 1;
	}
	kfree_skb(skb);

	if (chain_ok) {
		set_bit(PAPRD_DONE, &caldata->cal_flags);
		ath_paprd_activate(sc);
	}

fail_paprd:
	ath9k_ps_restore(sc);
}

/*
 *  ANI performs periodic noise floor calibration
 *  that is used to adjust and optimize the chip performance.  This
 *  takes environmental changes (location, temperature) into account.
 *  When the task is complete, it reschedules itself depending on the
 *  appropriate interval that was calculated.
 */
void ath_ani_calibrate(unsigned long data)
{
	struct ath_softc *sc = (struct ath_softc *)data;
	struct ath_hw *ah = sc->sc_ah;
	struct ath_common *common = ath9k_hw_common(ah);
	bool longcal = false;
	bool shortcal = false;
	bool aniflag = false;
	unsigned int timestamp = jiffies_to_msecs(jiffies);
	u32 cal_interval, short_cal_interval, long_cal_interval;
	unsigned long flags;

	if (ah->caldata && test_bit(NFCAL_INTF, &ah->caldata->cal_flags))
		long_cal_interval = ATH_LONG_CALINTERVAL_INT;
	else
		long_cal_interval = ATH_LONG_CALINTERVAL;

	short_cal_interval = (ah->opmode == NL80211_IFTYPE_AP) ?
		ATH_AP_SHORT_CALINTERVAL : ATH_STA_SHORT_CALINTERVAL;

	/* Only calibrate if awake */
	if (sc->sc_ah->power_mode != ATH9K_PM_AWAKE) {
		if (++ah->ani_skip_count >= ATH_ANI_MAX_SKIP_COUNT) {
			spin_lock_irqsave(&sc->sc_pm_lock, flags);
			sc->ps_flags |= PS_WAIT_FOR_ANI;
			spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
		}
		goto set_timer;
	}
	ah->ani_skip_count = 0;
	spin_lock_irqsave(&sc->sc_pm_lock, flags);
	sc->ps_flags &= ~PS_WAIT_FOR_ANI;
	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);

	ath9k_ps_wakeup(sc);

	/* Long calibration runs independently of short calibration. */
	if ((timestamp - common->ani.longcal_timer) >= long_cal_interval) {
		longcal = true;
		common->ani.longcal_timer = timestamp;
	}

	/* Short calibration applies only while caldone is false */
	if (!common->ani.caldone) {
		if ((timestamp - common->ani.shortcal_timer) >= short_cal_interval) {
			shortcal = true;
			common->ani.shortcal_timer = timestamp;
			common->ani.resetcal_timer = timestamp;
		}
	} else {
		if ((timestamp - common->ani.resetcal_timer) >=
		    ATH_RESTART_CALINTERVAL) {
			common->ani.caldone = ath9k_hw_reset_calvalid(ah);
			if (common->ani.caldone)
				common->ani.resetcal_timer = timestamp;
		}
	}

	/* Verify whether we must check ANI */
	if ((timestamp - common->ani.checkani_timer) >= ah->config.ani_poll_interval) {
		aniflag = true;
		common->ani.checkani_timer = timestamp;
	}

	/* Call ANI routine if necessary */
	if (aniflag) {
		spin_lock_irqsave(&common->cc_lock, flags);
		ath9k_hw_ani_monitor(ah, ah->curchan);
		ath_update_survey_stats(sc);
		spin_unlock_irqrestore(&common->cc_lock, flags);
	}

	/* Perform calibration if necessary */
	if (longcal || shortcal) {
		common->ani.caldone =
			ath9k_hw_calibrate(ah, ah->curchan,
					   ah->rxchainmask, longcal);
	}

	ath_dbg(common, ANI,
		"Calibration @%lu finished: %s %s %s, caldone: %s\n",
		jiffies,
		longcal ? "long" : "", shortcal ? "short" : "",
		aniflag ? "ani" : "", common->ani.caldone ? "true" : "false");

	ath9k_ps_restore(sc);

set_timer:
	/*
	* Set timer interval based on previous results.
	* The interval must be the shortest necessary to satisfy ANI,
	* short calibration and long calibration.
	*/
	cal_interval = ATH_LONG_CALINTERVAL;
	cal_interval = min(cal_interval, (u32)ah->config.ani_poll_interval);
	if (!common->ani.caldone)
		cal_interval = min(cal_interval, (u32)short_cal_interval);

	mod_timer(&common->ani.timer, jiffies + msecs_to_jiffies(cal_interval));

	if (ar9003_is_paprd_enabled(ah) && ah->caldata) {
		if (!test_bit(PAPRD_DONE, &ah->caldata->cal_flags)) {
			ieee80211_queue_work(sc->hw, &sc->paprd_work);
		} else if (!ah->paprd_table_write_done) {
			ath9k_ps_wakeup(sc);
			ath_paprd_activate(sc);
			ath9k_ps_restore(sc);
		}
	}
}

void ath_start_ani(struct ath_softc *sc)
{
	struct ath_hw *ah = sc->sc_ah;
	struct ath_common *common = ath9k_hw_common(ah);
	unsigned long timestamp = jiffies_to_msecs(jiffies);

	if (common->disable_ani ||
	    !test_bit(SC_OP_ANI_RUN, &sc->sc_flags) ||
	    (sc->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL))
		return;

	common->ani.longcal_timer = timestamp;
	common->ani.shortcal_timer = timestamp;
	common->ani.checkani_timer = timestamp;

	ath_dbg(common, ANI, "Starting ANI\n");
	mod_timer(&common->ani.timer,
		  jiffies + msecs_to_jiffies((u32)ah->config.ani_poll_interval));
}

void ath_stop_ani(struct ath_softc *sc)
{
	struct ath_common *common = ath9k_hw_common(sc->sc_ah);

	ath_dbg(common, ANI, "Stopping ANI\n");
	del_timer_sync(&common->ani.timer);
}

void ath_check_ani(struct ath_softc *sc)
{
	struct ath_hw *ah = sc->sc_ah;
	struct ath_beacon_config *cur_conf = &sc->cur_beacon_conf;

	/*
	 * Check for the various conditions in which ANI has to
	 * be stopped.
	 */
	if (ah->opmode == NL80211_IFTYPE_ADHOC) {
		if (!cur_conf->enable_beacon)
			goto stop_ani;
	} else if (ah->opmode == NL80211_IFTYPE_AP) {
		if (!cur_conf->enable_beacon) {
			/*
			 * Disable ANI only when there are no
			 * associated stations.
			 */
			if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
				goto stop_ani;
		}
	} else if (ah->opmode == NL80211_IFTYPE_STATION) {
		if (!test_bit(SC_OP_PRIM_STA_VIF, &sc->sc_flags))
			goto stop_ani;
	}

	if (!test_bit(SC_OP_ANI_RUN, &sc->sc_flags)) {
		set_bit(SC_OP_ANI_RUN, &sc->sc_flags);
		ath_start_ani(sc);
	}

	return;

stop_ani:
	clear_bit(SC_OP_ANI_RUN, &sc->sc_flags);
	ath_stop_ani(sc);
}

void ath_update_survey_nf(struct ath_softc *sc, int channel)
{
	struct ath_hw *ah = sc->sc_ah;
	struct ath9k_channel *chan = &ah->channels[channel];
	struct survey_info *survey = &sc->survey[channel];

	if (chan->noisefloor) {
		survey->filled |= SURVEY_INFO_NOISE_DBM;
		survey->noise = ath9k_hw_getchan_noise(ah, chan,
						       chan->noisefloor);
	}
}

/*
 * Updates the survey statistics and returns the busy time since last
 * update in %, if the measurement duration was long enough for the
 * result to be useful, -1 otherwise.
 */
int ath_update_survey_stats(struct ath_softc *sc)
{
	struct ath_hw *ah = sc->sc_ah;
	struct ath_common *common = ath9k_hw_common(ah);
	int pos = ah->curchan - &ah->channels[0];
	struct survey_info *survey = &sc->survey[pos];
	struct ath_cycle_counters *cc = &common->cc_survey;
	unsigned int div = common->clockrate * 1000;
	int ret = 0;

	if (!ah->curchan)
		return -1;

	if (ah->power_mode == ATH9K_PM_AWAKE)
		ath_hw_cycle_counters_update(common);

	if (cc->cycles > 0) {
		survey->filled |= SURVEY_INFO_CHANNEL_TIME |
			SURVEY_INFO_CHANNEL_TIME_BUSY |
			SURVEY_INFO_CHANNEL_TIME_RX |
			SURVEY_INFO_CHANNEL_TIME_TX;
		survey->channel_time += cc->cycles / div;
		survey->channel_time_busy += cc->rx_busy / div;
		survey->channel_time_rx += cc->rx_frame / div;
		survey->channel_time_tx += cc->tx_frame / div;
	}

	if (cc->cycles < div)
		return -1;

	if (cc->cycles > 0)
		ret = cc->rx_busy * 100 / cc->cycles;

	memset(cc, 0, sizeof(*cc));

	ath_update_survey_nf(sc, pos);

	return ret;
}