aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlwifi/iwl-power.c
blob: 0b16841f45f475ab2f112fd7b3c8df0c51cfbcf1 (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
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
/******************************************************************************
 *
 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>

#include <net/mac80211.h>

#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-commands.h"
#include "iwl-debug.h"
#include "iwl-power.h"

/*
 * Setting power level allows the card to go to sleep when not busy.
 *
 * We calculate a sleep command based on the required latency, which
 * we get from mac80211. In order to handle thermal throttling, we can
 * also use pre-defined power levels.
 */

/*
 * For now, keep using power level 1 instead of automatically
 * adjusting ...
 */
bool no_sleep_autoadjust = true;
module_param(no_sleep_autoadjust, bool, S_IRUGO);
MODULE_PARM_DESC(no_sleep_autoadjust,
		 "don't automatically adjust sleep level "
		 "according to maximum network latency");

/*
 * This defines the old power levels. They are still used by default
 * (level 1) and for thermal throttle (levels 3 through 5)
 */

struct iwl_power_vec_entry {
	struct iwl_powertable_cmd cmd;
	u8 no_dtim;
};

#define IWL_DTIM_RANGE_0_MAX	2
#define IWL_DTIM_RANGE_1_MAX	10

#define NOSLP cpu_to_le16(0), 0, 0
#define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
#define TU_TO_USEC 1024
#define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
#define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
				     cpu_to_le32(X1), \
				     cpu_to_le32(X2), \
				     cpu_to_le32(X3), \
				     cpu_to_le32(X4)}
/* default power management (not Tx power) table values */
/* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
};


/* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
};

/* for DTIM period > IWL_DTIM_RANGE_1_MAX */
static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
	{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
	{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
	{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
};

static void iwl_static_sleep_cmd(struct iwl_priv *priv,
				 struct iwl_powertable_cmd *cmd,
				 enum iwl_power_level lvl, int period)
{
	const struct iwl_power_vec_entry *table;
	int max_sleep, i;
	bool skip;

	table = range_2;
	if (period < IWL_DTIM_RANGE_1_MAX)
		table = range_1;
	if (period < IWL_DTIM_RANGE_0_MAX)
		table = range_0;

	BUG_ON(lvl < 0 || lvl >= IWL_POWER_NUM);

	*cmd = table[lvl].cmd;

	if (period == 0) {
		skip = false;
		period = 1;
	} else {
		skip = !!table[lvl].no_dtim;
	}

	if (skip) {
		__le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
		max_sleep = le32_to_cpu(slp_itrvl);
		if (max_sleep == 0xFF)
			max_sleep = period * (skip + 1);
		else if (max_sleep > period)
			max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
		cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
	} else {
		max_sleep = period;
		cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
	}

	for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
		if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
			cmd->sleep_interval[i] = cpu_to_le32(max_sleep);

	if (priv->power_data.pci_pm)
		cmd->flags |= IWL_POWER_PCI_PM_MSK;
	else
		cmd->flags &= ~IWL_POWER_PCI_PM_MSK;

	IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
}

/* default Thermal Throttling transaction table
 * Current state   |         Throttling Down               |  Throttling Up
 *=============================================================================
 *                 Condition Nxt State  Condition Nxt State Condition Nxt State
 *-----------------------------------------------------------------------------
 *     IWL_TI_0     T >= 115   CT_KILL  115>T>=105   TI_1      N/A      N/A
 *     IWL_TI_1     T >= 115   CT_KILL  115>T>=110   TI_2     T<=95     TI_0
 *     IWL_TI_2     T >= 115   CT_KILL                        T<=100    TI_1
 *    IWL_CT_KILL      N/A       N/A       N/A        N/A     T<=95     TI_0
 *=============================================================================
 */
static const struct iwl_tt_trans tt_range_0[IWL_TI_STATE_MAX - 1] = {
	{IWL_TI_0, IWL_ABSOLUTE_ZERO, 104},
	{IWL_TI_1, 105, CT_KILL_THRESHOLD},
	{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};
static const struct iwl_tt_trans tt_range_1[IWL_TI_STATE_MAX - 1] = {
	{IWL_TI_0, IWL_ABSOLUTE_ZERO, 95},
	{IWL_TI_2, 110, CT_KILL_THRESHOLD},
	{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};
static const struct iwl_tt_trans tt_range_2[IWL_TI_STATE_MAX - 1] = {
	{IWL_TI_1, IWL_ABSOLUTE_ZERO, 100},
	{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
	{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};
static const struct iwl_tt_trans tt_range_3[IWL_TI_STATE_MAX - 1] = {
	{IWL_TI_0, IWL_ABSOLUTE_ZERO, CT_KILL_EXIT_THRESHOLD},
	{IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
	{IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};

/* Advance Thermal Throttling default restriction table */
static const struct iwl_tt_restriction restriction_range[IWL_TI_STATE_MAX] = {
	{IWL_ANT_OK_MULTI, IWL_ANT_OK_MULTI, true },
	{IWL_ANT_OK_SINGLE, IWL_ANT_OK_MULTI, true },
	{IWL_ANT_OK_SINGLE, IWL_ANT_OK_SINGLE, false },
	{IWL_ANT_OK_NONE, IWL_ANT_OK_NONE, false }
};


static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
				    struct iwl_powertable_cmd *cmd)
{
	memset(cmd, 0, sizeof(*cmd));

	if (priv->power_data.pci_pm)
		cmd->flags |= IWL_POWER_PCI_PM_MSK;

	IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
}

static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
				     struct iwl_powertable_cmd *cmd,
				     int dynps_ms, int wakeup_period)
{
	int i;

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

	cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
		     IWL_POWER_FAST_PD; /* no use seeing frames for others */

	if (priv->power_data.pci_pm)
		cmd->flags |= IWL_POWER_PCI_PM_MSK;

	cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
	cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);

	for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
		cmd->sleep_interval[i] = cpu_to_le32(wakeup_period);

	IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
}

static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
{
	IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
	IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
	IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
	IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
	IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
			le32_to_cpu(cmd->sleep_interval[0]),
			le32_to_cpu(cmd->sleep_interval[1]),
			le32_to_cpu(cmd->sleep_interval[2]),
			le32_to_cpu(cmd->sleep_interval[3]),
			le32_to_cpu(cmd->sleep_interval[4]));

	return iwl_send_cmd_pdu(priv, POWER_TABLE_CMD,
				sizeof(struct iwl_powertable_cmd), cmd);
}


int iwl_power_update_mode(struct iwl_priv *priv, bool force)
{
	int ret = 0;
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	bool enabled = (priv->iw_mode == NL80211_IFTYPE_STATION) &&
			(priv->hw->conf.flags & IEEE80211_CONF_PS);
	bool update_chains;
	struct iwl_powertable_cmd cmd;
	int dtimper;

	/* Don't update the RX chain when chain noise calibration is running */
	update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
			priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;

	if (priv->vif)
		dtimper = priv->vif->bss_conf.dtim_period;
	else
		dtimper = 1;

	/* TT power setting overwrites everything */
	if (tt->state >= IWL_TI_1)
		iwl_static_sleep_cmd(priv, &cmd, tt->tt_power_mode, dtimper);
	else if (!enabled)
		iwl_power_sleep_cam_cmd(priv, &cmd);
	else if (priv->power_data.debug_sleep_level_override >= 0)
		iwl_static_sleep_cmd(priv, &cmd,
				     priv->power_data.debug_sleep_level_override,
				     dtimper);
	else if (no_sleep_autoadjust)
		iwl_static_sleep_cmd(priv, &cmd, IWL_POWER_INDEX_1, dtimper);
	else
		iwl_power_fill_sleep_cmd(priv, &cmd,
					 priv->hw->conf.dynamic_ps_timeout,
					 priv->hw->conf.max_sleep_period);

	if (iwl_is_ready_rf(priv) &&
	    (memcmp(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd)) || force)) {
		if (cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
			set_bit(STATUS_POWER_PMI, &priv->status);

		ret = iwl_set_power(priv, &cmd);
		if (!ret) {
			if (!(cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
				clear_bit(STATUS_POWER_PMI, &priv->status);

			if (priv->cfg->ops->lib->update_chain_flags &&
			    update_chains)
				priv->cfg->ops->lib->update_chain_flags(priv);
			else
				IWL_DEBUG_POWER(priv,
					"Cannot update the power, chain noise "
					"calibration running: %d\n",
					priv->chain_noise_data.state);
			memcpy(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd));
		} else
			IWL_ERR(priv, "set power fail, ret = %d", ret);
	}

	return ret;
}
EXPORT_SYMBOL(iwl_power_update_mode);

bool iwl_ht_enabled(struct iwl_priv *priv)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	struct iwl_tt_restriction *restriction;

	if (!priv->thermal_throttle.advanced_tt)
		return true;
	restriction = tt->restriction + tt->state;
	return restriction->is_ht;
}
EXPORT_SYMBOL(iwl_ht_enabled);

enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	struct iwl_tt_restriction *restriction;

	if (!priv->thermal_throttle.advanced_tt)
		return IWL_ANT_OK_MULTI;
	restriction = tt->restriction + tt->state;
	return restriction->tx_stream;
}
EXPORT_SYMBOL(iwl_tx_ant_restriction);

enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	struct iwl_tt_restriction *restriction;

	if (!priv->thermal_throttle.advanced_tt)
		return IWL_ANT_OK_MULTI;
	restriction = tt->restriction + tt->state;
	return restriction->rx_stream;
}

#define CT_KILL_EXIT_DURATION (5)	/* 5 seconds duration */

/*
 * toggle the bit to wake up uCode and check the temperature
 * if the temperature is below CT, uCode will stay awake and send card
 * state notification with CT_KILL bit clear to inform Thermal Throttling
 * Management to change state. Otherwise, uCode will go back to sleep
 * without doing anything, driver should continue the 5 seconds timer
 * to wake up uCode for temperature check until temperature drop below CT
 */
static void iwl_tt_check_exit_ct_kill(unsigned long data)
{
	struct iwl_priv *priv = (struct iwl_priv *)data;
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	unsigned long flags;

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	if (tt->state == IWL_TI_CT_KILL) {
		if (priv->thermal_throttle.ct_kill_toggle) {
			iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
				    CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
			priv->thermal_throttle.ct_kill_toggle = false;
		} else {
			iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
				    CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
			priv->thermal_throttle.ct_kill_toggle = true;
		}
		iwl_read32(priv, CSR_UCODE_DRV_GP1);
		spin_lock_irqsave(&priv->reg_lock, flags);
		if (!iwl_grab_nic_access(priv))
			iwl_release_nic_access(priv);
		spin_unlock_irqrestore(&priv->reg_lock, flags);

		/* Reschedule the ct_kill timer to occur in
		 * CT_KILL_EXIT_DURATION seconds to ensure we get a
		 * thermal update */
		mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
			  CT_KILL_EXIT_DURATION * HZ);
	}
}

static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
			   bool stop)
{
	if (stop) {
		IWL_DEBUG_POWER(priv, "Stop all queues\n");
		if (priv->mac80211_registered)
			ieee80211_stop_queues(priv->hw);
		IWL_DEBUG_POWER(priv,
				"Schedule 5 seconds CT_KILL Timer\n");
		mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
			  CT_KILL_EXIT_DURATION * HZ);
	} else {
		IWL_DEBUG_POWER(priv, "Wake all queues\n");
		if (priv->mac80211_registered)
			ieee80211_wake_queues(priv->hw);
	}
}

#define IWL_MINIMAL_POWER_THRESHOLD		(CT_KILL_THRESHOLD_LEGACY)
#define IWL_REDUCED_PERFORMANCE_THRESHOLD_2	(100)
#define IWL_REDUCED_PERFORMANCE_THRESHOLD_1	(90)

/*
 * Legacy thermal throttling
 * 1) Avoid NIC destruction due to high temperatures
 *	Chip will identify dangerously high temperatures that can
 *	harm the device and will power down
 * 2) Avoid the NIC power down due to high temperature
 *	Throttle early enough to lower the power consumption before
 *	drastic steps are needed
 */
static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	enum iwl_tt_state old_state;

#ifdef CONFIG_IWLWIFI_DEBUG
	if ((tt->tt_previous_temp) &&
	    (temp > tt->tt_previous_temp) &&
	    ((temp - tt->tt_previous_temp) >
	    IWL_TT_INCREASE_MARGIN)) {
		IWL_DEBUG_POWER(priv,
			"Temperature increase %d degree Celsius\n",
			(temp - tt->tt_previous_temp));
	}
#endif
	old_state = tt->state;
	/* in Celsius */
	if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
		tt->state = IWL_TI_CT_KILL;
	else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
		tt->state = IWL_TI_2;
	else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
		tt->state = IWL_TI_1;
	else
		tt->state = IWL_TI_0;

#ifdef CONFIG_IWLWIFI_DEBUG
	tt->tt_previous_temp = temp;
#endif
	if (tt->state != old_state) {
		switch (tt->state) {
		case IWL_TI_0:
			/*
			 * When the system is ready to go back to IWL_TI_0
			 * we only have to call iwl_power_update_mode() to
			 * do so.
			 */
			break;
		case IWL_TI_1:
			tt->tt_power_mode = IWL_POWER_INDEX_3;
			break;
		case IWL_TI_2:
			tt->tt_power_mode = IWL_POWER_INDEX_4;
			break;
		default:
			tt->tt_power_mode = IWL_POWER_INDEX_5;
			break;
		}
		mutex_lock(&priv->mutex);
		if (iwl_power_update_mode(priv, true)) {
			/* TT state not updated
			 * try again during next temperature read
			 */
			tt->state = old_state;
			IWL_ERR(priv, "Cannot update power mode, "
					"TT state not updated\n");
		} else {
			if (tt->state == IWL_TI_CT_KILL)
				iwl_perform_ct_kill_task(priv, true);
			else if (old_state == IWL_TI_CT_KILL &&
				 tt->state != IWL_TI_CT_KILL)
				iwl_perform_ct_kill_task(priv, false);
			IWL_DEBUG_POWER(priv, "Temperature state changed %u\n",
					tt->state);
			IWL_DEBUG_POWER(priv, "Power Index change to %u\n",
					tt->tt_power_mode);
		}
		mutex_unlock(&priv->mutex);
	}
}

/*
 * Advance thermal throttling
 * 1) Avoid NIC destruction due to high temperatures
 *	Chip will identify dangerously high temperatures that can
 *	harm the device and will power down
 * 2) Avoid the NIC power down due to high temperature
 *	Throttle early enough to lower the power consumption before
 *	drastic steps are needed
 *	Actions include relaxing the power down sleep thresholds and
 *	decreasing the number of TX streams
 * 3) Avoid throughput performance impact as much as possible
 *
 *=============================================================================
 *                 Condition Nxt State  Condition Nxt State Condition Nxt State
 *-----------------------------------------------------------------------------
 *     IWL_TI_0     T >= 115   CT_KILL  115>T>=105   TI_1      N/A      N/A
 *     IWL_TI_1     T >= 115   CT_KILL  115>T>=110   TI_2     T<=95     TI_0
 *     IWL_TI_2     T >= 115   CT_KILL                        T<=100    TI_1
 *    IWL_CT_KILL      N/A       N/A       N/A        N/A     T<=95     TI_0
 *=============================================================================
 */
static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	int i;
	bool changed = false;
	enum iwl_tt_state old_state;
	struct iwl_tt_trans *transaction;

	old_state = tt->state;
	for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
		/* based on the current TT state,
		 * find the curresponding transaction table
		 * each table has (IWL_TI_STATE_MAX - 1) entries
		 * tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
		 * will advance to the correct table.
		 * then based on the current temperature
		 * find the next state need to transaction to
		 * go through all the possible (IWL_TI_STATE_MAX - 1) entries
		 * in the current table to see if transaction is needed
		 */
		transaction = tt->transaction +
			((old_state * (IWL_TI_STATE_MAX - 1)) + i);
		if (temp >= transaction->tt_low &&
		    temp <= transaction->tt_high) {
#ifdef CONFIG_IWLWIFI_DEBUG
			if ((tt->tt_previous_temp) &&
			    (temp > tt->tt_previous_temp) &&
			    ((temp - tt->tt_previous_temp) >
			    IWL_TT_INCREASE_MARGIN)) {
				IWL_DEBUG_POWER(priv,
					"Temperature increase %d "
					"degree Celsius\n",
					(temp - tt->tt_previous_temp));
			}
			tt->tt_previous_temp = temp;
#endif
			if (old_state !=
			    transaction->next_state) {
				changed = true;
				tt->state =
					transaction->next_state;
			}
			break;
		}
	}
	if (changed) {
		struct iwl_rxon_cmd *rxon = &priv->staging_rxon;

		if (tt->state >= IWL_TI_1) {
			/* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
			tt->tt_power_mode = IWL_POWER_INDEX_5;
			if (!iwl_ht_enabled(priv))
				/* disable HT */
				rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
					RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
					RXON_FLG_HT40_PROT_MSK |
					RXON_FLG_HT_PROT_MSK);
			else {
				/* check HT capability and set
				 * according to the system HT capability
				 * in case get disabled before */
				iwl_set_rxon_ht(priv, &priv->current_ht_config);
			}

		} else {
			/*
			 * restore system power setting -- it will be
			 * recalculated automatically.
			 */

			/* check HT capability and set
			 * according to the system HT capability
			 * in case get disabled before */
			iwl_set_rxon_ht(priv, &priv->current_ht_config);
		}
		mutex_lock(&priv->mutex);
		if (iwl_power_update_mode(priv, true)) {
			/* TT state not updated
			 * try again during next temperature read
			 */
			IWL_ERR(priv, "Cannot update power mode, "
					"TT state not updated\n");
			tt->state = old_state;
		} else {
			IWL_DEBUG_POWER(priv,
					"Thermal Throttling to new state: %u\n",
					tt->state);
			if (old_state != IWL_TI_CT_KILL &&
			    tt->state == IWL_TI_CT_KILL) {
				IWL_DEBUG_POWER(priv, "Enter IWL_TI_CT_KILL\n");
				iwl_perform_ct_kill_task(priv, true);

			} else if (old_state == IWL_TI_CT_KILL &&
				  tt->state != IWL_TI_CT_KILL) {
				IWL_DEBUG_POWER(priv, "Exit IWL_TI_CT_KILL\n");
				iwl_perform_ct_kill_task(priv, false);
			}
		}
		mutex_unlock(&priv->mutex);
	}
}

/* Card State Notification indicated reach critical temperature
 * if PSP not enable, no Thermal Throttling function will be performed
 * just set the GP1 bit to acknowledge the event
 * otherwise, go into IWL_TI_CT_KILL state
 * since Card State Notification will not provide any temperature reading
 * for Legacy mode
 * so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
 * for advance mode
 * pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
 */
static void iwl_bg_ct_enter(struct work_struct *work)
{
	struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	if (!iwl_is_ready(priv))
		return;

	if (tt->state != IWL_TI_CT_KILL) {
		IWL_ERR(priv, "Device reached critical temperature "
			      "- ucode going to sleep!\n");
		if (!priv->thermal_throttle.advanced_tt)
			iwl_legacy_tt_handler(priv,
					      IWL_MINIMAL_POWER_THRESHOLD);
		else
			iwl_advance_tt_handler(priv,
					       CT_KILL_THRESHOLD + 1);
	}
}

/* Card State Notification indicated out of critical temperature
 * since Card State Notification will not provide any temperature reading
 * so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
 * to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
 */
static void iwl_bg_ct_exit(struct work_struct *work)
{
	struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	if (!iwl_is_ready(priv))
		return;

	/* stop ct_kill_exit_tm timer */
	del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);

	if (tt->state == IWL_TI_CT_KILL) {
		IWL_ERR(priv,
			"Device temperature below critical"
			"- ucode awake!\n");
		if (!priv->thermal_throttle.advanced_tt)
			iwl_legacy_tt_handler(priv,
					IWL_REDUCED_PERFORMANCE_THRESHOLD_2);
		else
			iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD);
	}
}

void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
{
	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	IWL_DEBUG_POWER(priv, "Queueing critical temperature enter.\n");
	queue_work(priv->workqueue, &priv->ct_enter);
}
EXPORT_SYMBOL(iwl_tt_enter_ct_kill);

void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
{
	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	IWL_DEBUG_POWER(priv, "Queueing critical temperature exit.\n");
	queue_work(priv->workqueue, &priv->ct_exit);
}
EXPORT_SYMBOL(iwl_tt_exit_ct_kill);

static void iwl_bg_tt_work(struct work_struct *work)
{
	struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
	s32 temp = priv->temperature; /* degrees CELSIUS except 4965 */

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
		temp = KELVIN_TO_CELSIUS(priv->temperature);

	if (!priv->thermal_throttle.advanced_tt)
		iwl_legacy_tt_handler(priv, temp);
	else
		iwl_advance_tt_handler(priv, temp);
}

void iwl_tt_handler(struct iwl_priv *priv)
{
	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	IWL_DEBUG_POWER(priv, "Queueing thermal throttling work.\n");
	queue_work(priv->workqueue, &priv->tt_work);
}
EXPORT_SYMBOL(iwl_tt_handler);

/* Thermal throttling initialization
 * For advance thermal throttling:
 *     Initialize Thermal Index and temperature threshold table
 *     Initialize thermal throttling restriction table
 */
void iwl_tt_initialize(struct iwl_priv *priv)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
	int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
	struct iwl_tt_trans *transaction;

	IWL_DEBUG_POWER(priv, "Initialize Thermal Throttling \n");

	memset(tt, 0, sizeof(struct iwl_tt_mgmt));

	tt->state = IWL_TI_0;
	init_timer(&priv->thermal_throttle.ct_kill_exit_tm);
	priv->thermal_throttle.ct_kill_exit_tm.data = (unsigned long)priv;
	priv->thermal_throttle.ct_kill_exit_tm.function = iwl_tt_check_exit_ct_kill;

	/* setup deferred ct kill work */
	INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
	INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
	INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);

	switch (priv->hw_rev & CSR_HW_REV_TYPE_MSK) {
	case CSR_HW_REV_TYPE_6x00:
	case CSR_HW_REV_TYPE_6x50:
		IWL_DEBUG_POWER(priv, "Advanced Thermal Throttling\n");
		tt->restriction = kzalloc(sizeof(struct iwl_tt_restriction) *
					 IWL_TI_STATE_MAX, GFP_KERNEL);
		tt->transaction = kzalloc(sizeof(struct iwl_tt_trans) *
			IWL_TI_STATE_MAX * (IWL_TI_STATE_MAX - 1),
			GFP_KERNEL);
		if (!tt->restriction || !tt->transaction) {
			IWL_ERR(priv, "Fallback to Legacy Throttling\n");
			priv->thermal_throttle.advanced_tt = false;
			kfree(tt->restriction);
			tt->restriction = NULL;
			kfree(tt->transaction);
			tt->transaction = NULL;
		} else {
			transaction = tt->transaction +
				(IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
			memcpy(transaction, &tt_range_0[0], size);
			transaction = tt->transaction +
				(IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
			memcpy(transaction, &tt_range_1[0], size);
			transaction = tt->transaction +
				(IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
			memcpy(transaction, &tt_range_2[0], size);
			transaction = tt->transaction +
				(IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
			memcpy(transaction, &tt_range_3[0], size);
			size = sizeof(struct iwl_tt_restriction) *
				IWL_TI_STATE_MAX;
			memcpy(tt->restriction,
				&restriction_range[0], size);
			priv->thermal_throttle.advanced_tt = true;
		}
		break;
	default:
		IWL_DEBUG_POWER(priv, "Legacy Thermal Throttling\n");
		priv->thermal_throttle.advanced_tt = false;
		break;
	}
}
EXPORT_SYMBOL(iwl_tt_initialize);

/* cleanup thermal throttling management related memory and timer */
void iwl_tt_exit(struct iwl_priv *priv)
{
	struct iwl_tt_mgmt *tt = &priv->thermal_throttle;

	/* stop ct_kill_exit_tm timer if activated */
	del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
	cancel_work_sync(&priv->tt_work);
	cancel_work_sync(&priv->ct_enter);
	cancel_work_sync(&priv->ct_exit);

	if (priv->thermal_throttle.advanced_tt) {
		/* free advance thermal throttling memory */
		kfree(tt->restriction);
		tt->restriction = NULL;
		kfree(tt->transaction);
		tt->transaction = NULL;
	}
}
EXPORT_SYMBOL(iwl_tt_exit);

/* initialize to default */
void iwl_power_initialize(struct iwl_priv *priv)
{
	u16 lctl = iwl_pcie_link_ctl(priv);

	priv->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);

	priv->power_data.debug_sleep_level_override = -1;

	memset(&priv->power_data.sleep_cmd, 0,
		sizeof(priv->power_data.sleep_cmd));
}
EXPORT_SYMBOL(iwl_power_initialize);