aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlwifi/iwl-eeprom.c
blob: 9429cb1c69bd2556fe74603c60a7b76416bc6378 (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
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2009 Intel Corporation. All rights reserved.
 *
 * 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.GPL.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2009 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/


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

#include <net/mac80211.h>

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

/************************** EEPROM BANDS ****************************
 *
 * The iwl_eeprom_band definitions below provide the mapping from the
 * EEPROM contents to the specific channel number supported for each
 * band.
 *
 * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
 * definition below maps to physical channel 42 in the 5.2GHz spectrum.
 * The specific geography and calibration information for that channel
 * is contained in the eeprom map itself.
 *
 * During init, we copy the eeprom information and channel map
 * information into priv->channel_info_24/52 and priv->channel_map_24/52
 *
 * channel_map_24/52 provides the index in the channel_info array for a
 * given channel.  We have to have two separate maps as there is channel
 * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
 * band_2
 *
 * A value of 0xff stored in the channel_map indicates that the channel
 * is not supported by the hardware at all.
 *
 * A value of 0xfe in the channel_map indicates that the channel is not
 * valid for Tx with the current hardware.  This means that
 * while the system can tune and receive on a given channel, it may not
 * be able to associate or transmit any frames on that
 * channel.  There is no corresponding channel information for that
 * entry.
 *
 *********************************************************************/

/* 2.4 GHz */
const u8 iwl_eeprom_band_1[14] = {
	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
};

/* 5.2 GHz bands */
static const u8 iwl_eeprom_band_2[] = {	/* 4915-5080MHz */
	183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
};

static const u8 iwl_eeprom_band_3[] = {	/* 5170-5320MHz */
	34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
};

static const u8 iwl_eeprom_band_4[] = {	/* 5500-5700MHz */
	100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
};

static const u8 iwl_eeprom_band_5[] = {	/* 5725-5825MHz */
	145, 149, 153, 157, 161, 165
};

static const u8 iwl_eeprom_band_6[] = {       /* 2.4 ht40 channel */
	1, 2, 3, 4, 5, 6, 7
};

static const u8 iwl_eeprom_band_7[] = {       /* 5.2 ht40 channel */
	36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
};

/**
 * struct iwl_txpwr_section: eeprom section information
 * @offset: indirect address into eeprom image
 * @count: number of "struct iwl_eeprom_enhanced_txpwr" in this section
 * @band: band type for the section
 * @is_common - true: common section, false: channel section
 * @is_cck - true: cck section, false: not cck section
 * @is_ht_40 - true: all channel in the section are HT40 channel,
 * 	       false: legacy or HT 20 MHz
 *	       ignore if it is common section
 * @iwl_eeprom_section_channel: channel array in the section,
 *	       ignore if common section
 */
struct iwl_txpwr_section {
	u32 offset;
	u8 count;
	enum ieee80211_band band;
	bool is_common;
	bool is_cck;
	bool is_ht40;
	u8 iwl_eeprom_section_channel[EEPROM_MAX_TXPOWER_SECTION_ELEMENTS];
};

/**
 * section 1 - 3 are regulatory tx power apply to all channels based on
 *    modulation: CCK, OFDM
 *    Band: 2.4GHz, 5.2GHz
 * section 4 - 10 are regulatory tx power apply to specified channels
 *    For example:
 *	1L - Channel 1 Legacy
 *	1HT - Channel 1 HT
 *	(1,+1) - Channel 1 HT40 "_above_"
 *
 * Section 1: all CCK channels
 * Section 2: all 2.4 GHz OFDM (Legacy, HT and HT40) channels
 * Section 3: all 5.2 GHz OFDM (Legacy, HT and HT40) channels
 * Section 4: 2.4 GHz 20MHz channels: 1L, 1HT, 2L, 2HT, 10L, 10HT, 11L, 11HT
 * Section 5: 2.4 GHz 40MHz channels: (1,+1) (2,+1) (6,+1) (7,+1) (9,+1)
 * Section 6: 5.2 GHz 20MHz channels: 36L, 64L, 100L, 36HT, 64HT, 100HT
 * Section 7: 5.2 GHz 40MHz channels: (36,+1) (60,+1) (100,+1)
 * Section 8: 2.4 GHz channel: 13L, 13HT
 * Section 9: 2.4 GHz channel: 140L, 140HT
 * Section 10: 2.4 GHz 40MHz channels: (132,+1)  (44,+1)
 *
 */
static const struct iwl_txpwr_section enhinfo[] = {
	{ EEPROM_LB_CCK_20_COMMON, 1, IEEE80211_BAND_2GHZ, true, true, false },
	{ EEPROM_LB_OFDM_COMMON, 3, IEEE80211_BAND_2GHZ, true, false, false },
	{ EEPROM_HB_OFDM_COMMON, 3, IEEE80211_BAND_5GHZ, true, false, false },
	{ EEPROM_LB_OFDM_20_BAND, 8, IEEE80211_BAND_2GHZ,
		false, false, false,
		{1, 1, 2, 2, 10, 10, 11, 11 } },
	{ EEPROM_LB_OFDM_HT40_BAND, 5, IEEE80211_BAND_2GHZ,
		false, false, true,
		{ 1, 2, 6, 7, 9 } },
	{ EEPROM_HB_OFDM_20_BAND, 6, IEEE80211_BAND_5GHZ,
		false, false, false,
		{ 36, 64, 100, 36, 64, 100 } },
	{ EEPROM_HB_OFDM_HT40_BAND, 3, IEEE80211_BAND_5GHZ,
		false, false, true,
		{ 36, 60, 100 } },
	{ EEPROM_LB_OFDM_20_CHANNEL_13, 2, IEEE80211_BAND_2GHZ,
		false, false, false,
		{ 13, 13 } },
	{ EEPROM_HB_OFDM_20_CHANNEL_140, 2, IEEE80211_BAND_5GHZ,
		false, false, false,
		{ 140, 140 } },
	{ EEPROM_HB_OFDM_HT40_BAND_1, 2, IEEE80211_BAND_5GHZ,
		false, false, true,
		{ 132, 44 } },
};

/******************************************************************************
 *
 * EEPROM related functions
 *
******************************************************************************/

int iwlcore_eeprom_verify_signature(struct iwl_priv *priv)
{
	u32 gp = iwl_read32(priv, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
	int ret = 0;

	IWL_DEBUG_INFO(priv, "EEPROM signature=0x%08x\n", gp);
	switch (gp) {
	case CSR_EEPROM_GP_BAD_SIG_EEP_GOOD_SIG_OTP:
		if (priv->nvm_device_type != NVM_DEVICE_TYPE_OTP) {
			IWL_ERR(priv, "EEPROM with bad signature: 0x%08x\n",
				gp);
			ret = -ENOENT;
		}
		break;
	case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
	case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
		if (priv->nvm_device_type != NVM_DEVICE_TYPE_EEPROM) {
			IWL_ERR(priv, "OTP with bad signature: 0x%08x\n", gp);
			ret = -ENOENT;
		}
		break;
	case CSR_EEPROM_GP_BAD_SIGNATURE_BOTH_EEP_AND_OTP:
	default:
		IWL_ERR(priv, "bad EEPROM/OTP signature, type=%s, "
			"EEPROM_GP=0x%08x\n",
			(priv->nvm_device_type == NVM_DEVICE_TYPE_OTP)
			? "OTP" : "EEPROM", gp);
		ret = -ENOENT;
		break;
	}
	return ret;
}
EXPORT_SYMBOL(iwlcore_eeprom_verify_signature);

static void iwl_set_otp_access(struct iwl_priv *priv, enum iwl_access_mode mode)
{
	u32 otpgp;

	otpgp = iwl_read32(priv, CSR_OTP_GP_REG);
	if (mode == IWL_OTP_ACCESS_ABSOLUTE)
		iwl_clear_bit(priv, CSR_OTP_GP_REG,
				CSR_OTP_GP_REG_OTP_ACCESS_MODE);
	else
		iwl_set_bit(priv, CSR_OTP_GP_REG,
				CSR_OTP_GP_REG_OTP_ACCESS_MODE);
}

static int iwlcore_get_nvm_type(struct iwl_priv *priv)
{
	u32 otpgp;
	int nvm_type;

	/* OTP only valid for CP/PP and after */
	switch (priv->hw_rev & CSR_HW_REV_TYPE_MSK) {
	case CSR_HW_REV_TYPE_NONE:
		IWL_ERR(priv, "Unknown hardware type\n");
		return -ENOENT;
	case CSR_HW_REV_TYPE_3945:
	case CSR_HW_REV_TYPE_4965:
	case CSR_HW_REV_TYPE_5300:
	case CSR_HW_REV_TYPE_5350:
	case CSR_HW_REV_TYPE_5100:
	case CSR_HW_REV_TYPE_5150:
		nvm_type = NVM_DEVICE_TYPE_EEPROM;
		break;
	default:
		otpgp = iwl_read32(priv, CSR_OTP_GP_REG);
		if (otpgp & CSR_OTP_GP_REG_DEVICE_SELECT)
			nvm_type = NVM_DEVICE_TYPE_OTP;
		else
			nvm_type = NVM_DEVICE_TYPE_EEPROM;
		break;
	}
	return  nvm_type;
}

/*
 * The device's EEPROM semaphore prevents conflicts between driver and uCode
 * when accessing the EEPROM; each access is a series of pulses to/from the
 * EEPROM chip, not a single event, so even reads could conflict if they
 * weren't arbitrated by the semaphore.
 */
int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
{
	u16 count;
	int ret;

	for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
		/* Request semaphore */
		iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
			    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

		/* See if we got it */
		ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
				CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
				EEPROM_SEM_TIMEOUT);
		if (ret >= 0) {
			IWL_DEBUG_IO(priv, "Acquired semaphore after %d tries.\n",
				count+1);
			return ret;
		}
	}

	return ret;
}
EXPORT_SYMBOL(iwlcore_eeprom_acquire_semaphore);

void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
{
	iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
		CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);

}
EXPORT_SYMBOL(iwlcore_eeprom_release_semaphore);

const u8 *iwlcore_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
{
	BUG_ON(offset >= priv->cfg->eeprom_size);
	return &priv->eeprom[offset];
}
EXPORT_SYMBOL(iwlcore_eeprom_query_addr);

static int iwl_init_otp_access(struct iwl_priv *priv)
{
	int ret;

	/* Enable 40MHz radio clock */
	_iwl_write32(priv, CSR_GP_CNTRL,
		     _iwl_read32(priv, CSR_GP_CNTRL) |
		     CSR_GP_CNTRL_REG_FLAG_INIT_DONE);

	/* wait for clock to be ready */
	ret = iwl_poll_bit(priv, CSR_GP_CNTRL,
				  CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
				  CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
				  25000);
	if (ret < 0)
		IWL_ERR(priv, "Time out access OTP\n");
	else {
		iwl_set_bits_prph(priv, APMG_PS_CTRL_REG,
				  APMG_PS_CTRL_VAL_RESET_REQ);
		udelay(5);
		iwl_clear_bits_prph(priv, APMG_PS_CTRL_REG,
				    APMG_PS_CTRL_VAL_RESET_REQ);

		/*
		 * CSR auto clock gate disable bit -
		 * this is only applicable for HW with OTP shadow RAM
		 */
		if (priv->cfg->shadow_ram_support)
			iwl_set_bit(priv, CSR_DBG_LINK_PWR_MGMT_REG,
				CSR_RESET_LINK_PWR_MGMT_DISABLED);
	}
	return ret;
}

static int iwl_read_otp_word(struct iwl_priv *priv, u16 addr, u16 *eeprom_data)
{
	int ret = 0;
	u32 r;
	u32 otpgp;

	_iwl_write32(priv, CSR_EEPROM_REG,
		     CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
	ret = iwl_poll_bit(priv, CSR_EEPROM_REG,
				  CSR_EEPROM_REG_READ_VALID_MSK,
				  CSR_EEPROM_REG_READ_VALID_MSK,
				  IWL_EEPROM_ACCESS_TIMEOUT);
	if (ret < 0) {
		IWL_ERR(priv, "Time out reading OTP[%d]\n", addr);
		return ret;
	}
	r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
	/* check for ECC errors: */
	otpgp = iwl_read32(priv, CSR_OTP_GP_REG);
	if (otpgp & CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK) {
		/* stop in this case */
		/* set the uncorrectable OTP ECC bit for acknowledgement */
		iwl_set_bit(priv, CSR_OTP_GP_REG,
			CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK);
		IWL_ERR(priv, "Uncorrectable OTP ECC error, abort OTP read\n");
		return -EINVAL;
	}
	if (otpgp & CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK) {
		/* continue in this case */
		/* set the correctable OTP ECC bit for acknowledgement */
		iwl_set_bit(priv, CSR_OTP_GP_REG,
				CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK);
		IWL_ERR(priv, "Correctable OTP ECC error, continue read\n");
	}
	*eeprom_data = le16_to_cpu((__force __le16)(r >> 16));
	return 0;
}

/*
 * iwl_is_otp_empty: check for empty OTP
 */
static bool iwl_is_otp_empty(struct iwl_priv *priv)
{
	u16 next_link_addr = 0, link_value;
	bool is_empty = false;

	/* locate the beginning of OTP link list */
	if (!iwl_read_otp_word(priv, next_link_addr, &link_value)) {
		if (!link_value) {
			IWL_ERR(priv, "OTP is empty\n");
			is_empty = true;
		}
	} else {
		IWL_ERR(priv, "Unable to read first block of OTP list.\n");
		is_empty = true;
	}

	return is_empty;
}


/*
 * iwl_find_otp_image: find EEPROM image in OTP
 *   finding the OTP block that contains the EEPROM image.
 *   the last valid block on the link list (the block _before_ the last block)
 *   is the block we should read and used to configure the device.
 *   If all the available OTP blocks are full, the last block will be the block
 *   we should read and used to configure the device.
 *   only perform this operation if shadow RAM is disabled
 */
static int iwl_find_otp_image(struct iwl_priv *priv,
					u16 *validblockaddr)
{
	u16 next_link_addr = 0, link_value = 0, valid_addr;
	int usedblocks = 0;

	/* set addressing mode to absolute to traverse the link list */
	iwl_set_otp_access(priv, IWL_OTP_ACCESS_ABSOLUTE);

	/* checking for empty OTP or error */
	if (iwl_is_otp_empty(priv))
		return -EINVAL;

	/*
	 * start traverse link list
	 * until reach the max number of OTP blocks
	 * different devices have different number of OTP blocks
	 */
	do {
		/* save current valid block address
		 * check for more block on the link list
		 */
		valid_addr = next_link_addr;
		next_link_addr = link_value * sizeof(u16);
		IWL_DEBUG_INFO(priv, "OTP blocks %d addr 0x%x\n",
			       usedblocks, next_link_addr);
		if (iwl_read_otp_word(priv, next_link_addr, &link_value))
			return -EINVAL;
		if (!link_value) {
			/*
			 * reach the end of link list, return success and
			 * set address point to the starting address
			 * of the image
			 */
			*validblockaddr = valid_addr;
			/* skip first 2 bytes (link list pointer) */
			*validblockaddr += 2;
			return 0;
		}
		/* more in the link list, continue */
		usedblocks++;
	} while (usedblocks <= priv->cfg->max_ll_items);

	/* OTP has no valid blocks */
	IWL_DEBUG_INFO(priv, "OTP has no valid blocks\n");
	return -EINVAL;
}

/**
 * iwl_eeprom_init - read EEPROM contents
 *
 * Load the EEPROM contents from adapter into priv->eeprom
 *
 * NOTE:  This routine uses the non-debug IO access functions.
 */
int iwl_eeprom_init(struct iwl_priv *priv)
{
	u16 *e;
	u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
	int sz;
	int ret;
	u16 addr;
	u16 validblockaddr = 0;
	u16 cache_addr = 0;

	priv->nvm_device_type = iwlcore_get_nvm_type(priv);
	if (priv->nvm_device_type == -ENOENT)
		return -ENOENT;
	/* allocate eeprom */
	IWL_DEBUG_INFO(priv, "NVM size = %d\n", priv->cfg->eeprom_size);
	sz = priv->cfg->eeprom_size;
	priv->eeprom = kzalloc(sz, GFP_KERNEL);
	if (!priv->eeprom) {
		ret = -ENOMEM;
		goto alloc_err;
	}
	e = (u16 *)priv->eeprom;

	ret = priv->cfg->ops->lib->eeprom_ops.verify_signature(priv);
	if (ret < 0) {
		IWL_ERR(priv, "EEPROM not found, EEPROM_GP=0x%08x\n", gp);
		ret = -ENOENT;
		goto err;
	}

	/* Make sure driver (instead of uCode) is allowed to read EEPROM */
	ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
	if (ret < 0) {
		IWL_ERR(priv, "Failed to acquire EEPROM semaphore.\n");
		ret = -ENOENT;
		goto err;
	}
	if (priv->nvm_device_type == NVM_DEVICE_TYPE_OTP) {
		ret = iwl_init_otp_access(priv);
		if (ret) {
			IWL_ERR(priv, "Failed to initialize OTP access.\n");
			ret = -ENOENT;
			goto done;
		}
		_iwl_write32(priv, CSR_EEPROM_GP,
			     iwl_read32(priv, CSR_EEPROM_GP) &
			     ~CSR_EEPROM_GP_IF_OWNER_MSK);

		iwl_set_bit(priv, CSR_OTP_GP_REG,
			     CSR_OTP_GP_REG_ECC_CORR_STATUS_MSK |
			     CSR_OTP_GP_REG_ECC_UNCORR_STATUS_MSK);
		/* traversing the linked list if no shadow ram supported */
		if (!priv->cfg->shadow_ram_support) {
			if (iwl_find_otp_image(priv, &validblockaddr)) {
				ret = -ENOENT;
				goto done;
			}
		}
		for (addr = validblockaddr; addr < validblockaddr + sz;
		     addr += sizeof(u16)) {
			u16 eeprom_data;

			ret = iwl_read_otp_word(priv, addr, &eeprom_data);
			if (ret)
				goto done;
			e[cache_addr / 2] = eeprom_data;
			cache_addr += sizeof(u16);
		}
	} else {
		/* eeprom is an array of 16bit values */
		for (addr = 0; addr < sz; addr += sizeof(u16)) {
			u32 r;

			_iwl_write32(priv, CSR_EEPROM_REG,
				     CSR_EEPROM_REG_MSK_ADDR & (addr << 1));

			ret = iwl_poll_bit(priv, CSR_EEPROM_REG,
						  CSR_EEPROM_REG_READ_VALID_MSK,
						  CSR_EEPROM_REG_READ_VALID_MSK,
						  IWL_EEPROM_ACCESS_TIMEOUT);
			if (ret < 0) {
				IWL_ERR(priv, "Time out reading EEPROM[%d]\n", addr);
				goto done;
			}
			r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
			e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
		}
	}
	ret = 0;
done:
	priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
err:
	if (ret)
		iwl_eeprom_free(priv);
alloc_err:
	return ret;
}
EXPORT_SYMBOL(iwl_eeprom_init);

void iwl_eeprom_free(struct iwl_priv *priv)
{
	kfree(priv->eeprom);
	priv->eeprom = NULL;
}
EXPORT_SYMBOL(iwl_eeprom_free);

int iwl_eeprom_check_version(struct iwl_priv *priv)
{
	u16 eeprom_ver;
	u16 calib_ver;

	eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
	calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);

	if (eeprom_ver < priv->cfg->eeprom_ver ||
	    calib_ver < priv->cfg->eeprom_calib_ver)
		goto err;

	return 0;
err:
	IWL_ERR(priv, "Unsupported (too old) EEPROM VER=0x%x < 0x%x CALIB=0x%x < 0x%x\n",
		  eeprom_ver, priv->cfg->eeprom_ver,
		  calib_ver,  priv->cfg->eeprom_calib_ver);
	return -EINVAL;

}
EXPORT_SYMBOL(iwl_eeprom_check_version);

const u8 *iwl_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
{
	return priv->cfg->ops->lib->eeprom_ops.query_addr(priv, offset);
}
EXPORT_SYMBOL(iwl_eeprom_query_addr);

u16 iwl_eeprom_query16(const struct iwl_priv *priv, size_t offset)
{
	if (!priv->eeprom)
		return 0;
	return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
}
EXPORT_SYMBOL(iwl_eeprom_query16);

void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
{
	const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
					EEPROM_MAC_ADDRESS);
	memcpy(mac, addr, ETH_ALEN);
}
EXPORT_SYMBOL(iwl_eeprom_get_mac);

static void iwl_init_band_reference(const struct iwl_priv *priv,
			int eep_band, int *eeprom_ch_count,
			const struct iwl_eeprom_channel **eeprom_ch_info,
			const u8 **eeprom_ch_index)
{
	u32 offset = priv->cfg->ops->lib->
			eeprom_ops.regulatory_bands[eep_band - 1];
	switch (eep_band) {
	case 1:		/* 2.4GHz band */
		*eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_1);
		*eeprom_ch_info = (struct iwl_eeprom_channel *)
				iwl_eeprom_query_addr(priv, offset);
		*eeprom_ch_index = iwl_eeprom_band_1;
		break;
	case 2:		/* 4.9GHz band */
		*eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_2);
		*eeprom_ch_info = (struct iwl_eeprom_channel *)
				iwl_eeprom_query_addr(priv, offset);
		*eeprom_ch_index = iwl_eeprom_band_2;
		break;
	case 3:		/* 5.2GHz band */
		*eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_3);
		*eeprom_ch_info = (struct iwl_eeprom_channel *)
				iwl_eeprom_query_addr(priv, offset);
		*eeprom_ch_index = iwl_eeprom_band_3;
		break;
	case 4:		/* 5.5GHz band */
		*eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_4);
		*eeprom_ch_info = (struct iwl_eeprom_channel *)
				iwl_eeprom_query_addr(priv, offset);
		*eeprom_ch_index = iwl_eeprom_band_4;
		break;
	case 5:		/* 5.7GHz band */
		*eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_5);
		*eeprom_ch_info = (struct iwl_eeprom_channel *)
				iwl_eeprom_query_addr(priv, offset);
		*eeprom_ch_index = iwl_eeprom_band_5;
		break;
	case 6:		/* 2.4GHz ht40 channels */
		*eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_6);
		*eeprom_ch_info = (struct iwl_eeprom_channel *)
				iwl_eeprom_query_addr(priv, offset);
		*eeprom_ch_index = iwl_eeprom_band_6;
		break;
	case 7:		/* 5 GHz ht40 channels */
		*eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_7);
		*eeprom_ch_info = (struct iwl_eeprom_channel *)
				iwl_eeprom_query_addr(priv, offset);
		*eeprom_ch_index = iwl_eeprom_band_7;
		break;
	default:
		BUG();
		return;
	}
}

#define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
			    ? # x " " : "")

/**
 * iwl_mod_ht40_chan_info - Copy ht40 channel info into driver's priv.
 *
 * Does not set up a command, or touch hardware.
 */
static int iwl_mod_ht40_chan_info(struct iwl_priv *priv,
			      enum ieee80211_band band, u16 channel,
			      const struct iwl_eeprom_channel *eeprom_ch,
			      u8 clear_ht40_extension_channel)
{
	struct iwl_channel_info *ch_info;

	ch_info = (struct iwl_channel_info *)
			iwl_get_channel_info(priv, band, channel);

	if (!is_channel_valid(ch_info))
		return -1;

	IWL_DEBUG_INFO(priv, "HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
			" Ad-Hoc %ssupported\n",
			ch_info->channel,
			is_channel_a_band(ch_info) ?
			"5.2" : "2.4",
			CHECK_AND_PRINT(IBSS),
			CHECK_AND_PRINT(ACTIVE),
			CHECK_AND_PRINT(RADAR),
			CHECK_AND_PRINT(WIDE),
			CHECK_AND_PRINT(DFS),
			eeprom_ch->flags,
			eeprom_ch->max_power_avg,
			((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
			 && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
			"" : "not ");

	ch_info->ht40_eeprom = *eeprom_ch;
	ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
	ch_info->ht40_curr_txpow = eeprom_ch->max_power_avg;
	ch_info->ht40_min_power = 0;
	ch_info->ht40_scan_power = eeprom_ch->max_power_avg;
	ch_info->ht40_flags = eeprom_ch->flags;
	ch_info->ht40_extension_channel &= ~clear_ht40_extension_channel;

	return 0;
}

/**
 * iwl_get_max_txpower_avg - get the highest tx power from all chains.
 *     find the highest tx power from all chains for the channel
 */
static s8 iwl_get_max_txpower_avg(struct iwl_priv *priv,
		struct iwl_eeprom_enhanced_txpwr *enhanced_txpower, int element)
{
	s8 max_txpower_avg = 0; /* (dBm) */

	IWL_DEBUG_INFO(priv, "%d - "
			"chain_a: %d dB chain_b: %d dB "
			"chain_c: %d dB mimo2: %d dB mimo3: %d dB\n",
			element,
			enhanced_txpower[element].chain_a_max >> 1,
			enhanced_txpower[element].chain_b_max >> 1,
			enhanced_txpower[element].chain_c_max >> 1,
			enhanced_txpower[element].mimo2_max >> 1,
			enhanced_txpower[element].mimo3_max >> 1);
	/* Take the highest tx power from any valid chains */
	if ((priv->cfg->valid_tx_ant & ANT_A) &&
	    (enhanced_txpower[element].chain_a_max > max_txpower_avg))
		max_txpower_avg = enhanced_txpower[element].chain_a_max;
	if ((priv->cfg->valid_tx_ant & ANT_B) &&
	    (enhanced_txpower[element].chain_b_max > max_txpower_avg))
		max_txpower_avg = enhanced_txpower[element].chain_b_max;
	if ((priv->cfg->valid_tx_ant & ANT_C) &&
	    (enhanced_txpower[element].chain_c_max > max_txpower_avg))
		max_txpower_avg = enhanced_txpower[element].chain_c_max;
	if (((priv->cfg->valid_tx_ant == ANT_AB) |
	    (priv->cfg->valid_tx_ant == ANT_BC) |
	    (priv->cfg->valid_tx_ant == ANT_AC)) &&
	    (enhanced_txpower[element].mimo2_max > max_txpower_avg))
		max_txpower_avg =  enhanced_txpower[element].mimo2_max;
	if ((priv->cfg->valid_tx_ant == ANT_ABC) &&
	    (enhanced_txpower[element].mimo3_max > max_txpower_avg))
		max_txpower_avg = enhanced_txpower[element].mimo3_max;

	/* max. tx power in EEPROM is in 1/2 dBm format
	 * convert from 1/2 dBm to dBm
	 */
	return max_txpower_avg >> 1;
}

/**
 * iwl_update_common_txpower: update channel tx power
 *     update tx power per band based on EEPROM enhanced tx power info.
 */
static s8 iwl_update_common_txpower(struct iwl_priv *priv,
		struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
		int section, int element)
{
	struct iwl_channel_info *ch_info;
	int ch;
	bool is_ht40 = false;
	s8 max_txpower_avg; /* (dBm) */

	/* it is common section, contain all type (Legacy, HT and HT40)
	 * based on the element in the section to determine
	 * is it HT 40 or not
	 */
	if (element == EEPROM_TXPOWER_COMMON_HT40_INDEX)
		is_ht40 = true;
	max_txpower_avg =
		iwl_get_max_txpower_avg(priv, enhanced_txpower, element);
	ch_info = priv->channel_info;

	for (ch = 0; ch < priv->channel_count; ch++) {
		/* find matching band and update tx power if needed */
		if ((ch_info->band == enhinfo[section].band) &&
		    (ch_info->max_power_avg < max_txpower_avg) && (!is_ht40)) {
			/* Update regulatory-based run-time data */
			ch_info->max_power_avg = ch_info->curr_txpow =
			    max_txpower_avg;
			ch_info->scan_power = max_txpower_avg;
		}
		if ((ch_info->band == enhinfo[section].band) && is_ht40 &&
		    ch_info->ht40_max_power_avg &&
		    (ch_info->ht40_max_power_avg < max_txpower_avg)) {
			/* Update regulatory-based run-time data */
			ch_info->ht40_max_power_avg = max_txpower_avg;
			ch_info->ht40_curr_txpow = max_txpower_avg;
			ch_info->ht40_scan_power = max_txpower_avg;
		}
		ch_info++;
	}
	return max_txpower_avg;
}

/**
 * iwl_update_channel_txpower: update channel tx power
 *      update channel tx power based on EEPROM enhanced tx power info.
 */
static s8 iwl_update_channel_txpower(struct iwl_priv *priv,
		struct iwl_eeprom_enhanced_txpwr *enhanced_txpower,
		int section, int element)
{
	struct iwl_channel_info *ch_info;
	int ch;
	u8 channel;
	s8 max_txpower_avg; /* (dBm) */

	channel = enhinfo[section].iwl_eeprom_section_channel[element];
	max_txpower_avg =
		iwl_get_max_txpower_avg(priv, enhanced_txpower, element);

	ch_info = priv->channel_info;
	for (ch = 0; ch < priv->channel_count; ch++) {
		/* find matching channel and update tx power if needed */
		if (ch_info->channel == channel) {
			if ((ch_info->max_power_avg < max_txpower_avg) &&
			    (!enhinfo[section].is_ht40)) {
				/* Update regulatory-based run-time data */
				ch_info->max_power_avg = max_txpower_avg;
				ch_info->curr_txpow = max_txpower_avg;
				ch_info->scan_power = max_txpower_avg;
			}
			if ((enhinfo[section].is_ht40) &&
			    (ch_info->ht40_max_power_avg) &&
			    (ch_info->ht40_max_power_avg < max_txpower_avg)) {
				/* Update regulatory-based run-time data */
				ch_info->ht40_max_power_avg = max_txpower_avg;
				ch_info->ht40_curr_txpow = max_txpower_avg;
				ch_info->ht40_scan_power = max_txpower_avg;
			}
			break;
		}
		ch_info++;
	}
	return max_txpower_avg;
}

/**
 * iwlcore_eeprom_enhanced_txpower: process enhanced tx power info
 */
void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
{
	int eeprom_section_count = 0;
	int section, element;
	struct iwl_eeprom_enhanced_txpwr *enhanced_txpower;
	u32 offset;
	s8 max_txpower_avg; /* (dBm) */

	/* Loop through all the sections
	 * adjust bands and channel's max tx power
	 * Set the tx_power_user_lmt to the highest power
	 * supported by any channels and chains
	 */
	for (section = 0; section < ARRAY_SIZE(enhinfo); section++) {
		eeprom_section_count = enhinfo[section].count;
		offset = enhinfo[section].offset;
		enhanced_txpower = (struct iwl_eeprom_enhanced_txpwr *)
				iwl_eeprom_query_addr(priv, offset);

		for (element = 0; element < eeprom_section_count; element++) {
			if (enhinfo[section].is_common)
				max_txpower_avg =
					iwl_update_common_txpower(priv,
					enhanced_txpower, section, element);
			else
				max_txpower_avg =
					iwl_update_channel_txpower(priv,
					enhanced_txpower, section, element);

			/* Update the tx_power_user_lmt to the highest power
			 * supported by any channel */
			if (max_txpower_avg > priv->tx_power_user_lmt)
				priv->tx_power_user_lmt = max_txpower_avg;
		}
	}
}
EXPORT_SYMBOL(iwlcore_eeprom_enhanced_txpower);

#define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
			    ? # x " " : "")

/**
 * iwl_init_channel_map - Set up driver's info for all possible channels
 */
int iwl_init_channel_map(struct iwl_priv *priv)
{
	int eeprom_ch_count = 0;
	const u8 *eeprom_ch_index = NULL;
	const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
	int band, ch;
	struct iwl_channel_info *ch_info;

	if (priv->channel_count) {
		IWL_DEBUG_INFO(priv, "Channel map already initialized.\n");
		return 0;
	}

	IWL_DEBUG_INFO(priv, "Initializing regulatory info from EEPROM\n");

	priv->channel_count =
	    ARRAY_SIZE(iwl_eeprom_band_1) +
	    ARRAY_SIZE(iwl_eeprom_band_2) +
	    ARRAY_SIZE(iwl_eeprom_band_3) +
	    ARRAY_SIZE(iwl_eeprom_band_4) +
	    ARRAY_SIZE(iwl_eeprom_band_5);

	IWL_DEBUG_INFO(priv, "Parsing data for %d channels.\n", priv->channel_count);

	priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
				     priv->channel_count, GFP_KERNEL);
	if (!priv->channel_info) {
		IWL_ERR(priv, "Could not allocate channel_info\n");
		priv->channel_count = 0;
		return -ENOMEM;
	}

	ch_info = priv->channel_info;

	/* Loop through the 5 EEPROM bands adding them in order to the
	 * channel map we maintain (that contains additional information than
	 * what just in the EEPROM) */
	for (band = 1; band <= 5; band++) {

		iwl_init_band_reference(priv, band, &eeprom_ch_count,
					&eeprom_ch_info, &eeprom_ch_index);

		/* Loop through each band adding each of the channels */
		for (ch = 0; ch < eeprom_ch_count; ch++) {
			ch_info->channel = eeprom_ch_index[ch];
			ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
			    IEEE80211_BAND_5GHZ;

			/* permanently store EEPROM's channel regulatory flags
			 *   and max power in channel info database. */
			ch_info->eeprom = eeprom_ch_info[ch];

			/* Copy the run-time flags so they are there even on
			 * invalid channels */
			ch_info->flags = eeprom_ch_info[ch].flags;
			/* First write that ht40 is not enabled, and then enable
			 * one by one */
			ch_info->ht40_extension_channel =
					IEEE80211_CHAN_NO_HT40;

			if (!(is_channel_valid(ch_info))) {
				IWL_DEBUG_INFO(priv, "Ch. %d Flags %x [%sGHz] - "
					       "No traffic\n",
					       ch_info->channel,
					       ch_info->flags,
					       is_channel_a_band(ch_info) ?
					       "5.2" : "2.4");
				ch_info++;
				continue;
			}

			/* Initialize regulatory-based run-time data */
			ch_info->max_power_avg = ch_info->curr_txpow =
			    eeprom_ch_info[ch].max_power_avg;
			ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
			ch_info->min_power = 0;

			IWL_DEBUG_INFO(priv, "Ch. %d [%sGHz] %s%s%s%s%s%s(0x%02x %ddBm):"
				       " Ad-Hoc %ssupported\n",
				       ch_info->channel,
				       is_channel_a_band(ch_info) ?
				       "5.2" : "2.4",
				       CHECK_AND_PRINT_I(VALID),
				       CHECK_AND_PRINT_I(IBSS),
				       CHECK_AND_PRINT_I(ACTIVE),
				       CHECK_AND_PRINT_I(RADAR),
				       CHECK_AND_PRINT_I(WIDE),
				       CHECK_AND_PRINT_I(DFS),
				       eeprom_ch_info[ch].flags,
				       eeprom_ch_info[ch].max_power_avg,
				       ((eeprom_ch_info[ch].
					 flags & EEPROM_CHANNEL_IBSS)
					&& !(eeprom_ch_info[ch].
					     flags & EEPROM_CHANNEL_RADAR))
				       ? "" : "not ");

			/* Set the tx_power_user_lmt to the highest power
			 * supported by any channel */
			if (eeprom_ch_info[ch].max_power_avg >
						priv->tx_power_user_lmt)
				priv->tx_power_user_lmt =
				    eeprom_ch_info[ch].max_power_avg;

			ch_info++;
		}
	}

	/* Check if we do have HT40 channels */
	if (priv->cfg->ops->lib->eeprom_ops.regulatory_bands[5] ==
	    EEPROM_REGULATORY_BAND_NO_HT40 &&
	    priv->cfg->ops->lib->eeprom_ops.regulatory_bands[6] ==
	    EEPROM_REGULATORY_BAND_NO_HT40)
		return 0;

	/* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
	for (band = 6; band <= 7; band++) {
		enum ieee80211_band ieeeband;

		iwl_init_band_reference(priv, band, &eeprom_ch_count,
					&eeprom_ch_info, &eeprom_ch_index);

		/* EEPROM band 6 is 2.4, band 7 is 5 GHz */
		ieeeband =
			(band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;

		/* Loop through each band adding each of the channels */
		for (ch = 0; ch < eeprom_ch_count; ch++) {
			/* Set up driver's info for lower half */
			iwl_mod_ht40_chan_info(priv, ieeeband,
						eeprom_ch_index[ch],
						&eeprom_ch_info[ch],
						IEEE80211_CHAN_NO_HT40PLUS);

			/* Set up driver's info for upper half */
			iwl_mod_ht40_chan_info(priv, ieeeband,
						eeprom_ch_index[ch] + 4,
						&eeprom_ch_info[ch],
						IEEE80211_CHAN_NO_HT40MINUS);
		}
	}

	/* for newer device (6000 series and up)
	 * EEPROM contain enhanced tx power information
	 * driver need to process addition information
	 * to determine the max channel tx power limits
	 */
	if (priv->cfg->ops->lib->eeprom_ops.update_enhanced_txpower)
		priv->cfg->ops->lib->eeprom_ops.update_enhanced_txpower(priv);

	return 0;
}
EXPORT_SYMBOL(iwl_init_channel_map);

/*
 * iwl_free_channel_map - undo allocations in iwl_init_channel_map
 */
void iwl_free_channel_map(struct iwl_priv *priv)
{
	kfree(priv->channel_info);
	priv->channel_count = 0;
}
EXPORT_SYMBOL(iwl_free_channel_map);

/**
 * iwl_get_channel_info - Find driver's private channel info
 *
 * Based on band and channel number.
 */
const struct iwl_channel_info *iwl_get_channel_info(const struct iwl_priv *priv,
					enum ieee80211_band band, u16 channel)
{
	int i;

	switch (band) {
	case IEEE80211_BAND_5GHZ:
		for (i = 14; i < priv->channel_count; i++) {
			if (priv->channel_info[i].channel == channel)
				return &priv->channel_info[i];
		}
		break;
	case IEEE80211_BAND_2GHZ:
		if (channel >= 1 && channel <= 14)
			return &priv->channel_info[channel - 1];
		break;
	default:
		BUG();
	}

	return NULL;
}
EXPORT_SYMBOL(iwl_get_channel_info);