summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlwifi/iwl-agn-eeprom.c
blob: cf9194baadac134087e28845d56ddd9cf251ed2e (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
/******************************************************************************
 *
 * 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 - 2010 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 - 2010 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/slab.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-agn.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.
 *
 *********************************************************************/

/**
 * 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
 *
******************************************************************************/

/*
 * 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;
}

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);

}

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;

	IWL_INFO(priv, "device EEPROM VER=0x%x, CALIB=0x%x\n",
		 eeprom_ver, calib_ver);

	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;

}

int iwl_eeprom_check_sku(struct iwl_priv *priv)
{
	u16 eeprom_sku;
	u16 radio_cfg;

	eeprom_sku = iwl_eeprom_query16(priv, EEPROM_SKU_CAP);

	priv->cfg->sku = ((eeprom_sku & EEPROM_SKU_CAP_BAND_SELECTION) >>
			EEPROM_SKU_CAP_BAND_POS);
	if (eeprom_sku & EEPROM_SKU_CAP_11N_ENABLE)
		priv->cfg->sku |= IWL_SKU_N;

	if (!priv->cfg->sku) {
		IWL_ERR(priv, "Invalid device sku\n");
		return -EINVAL;
	}

	IWL_INFO(priv, "Device SKU: 0X%x\n", priv->cfg->sku);

	if (!priv->cfg->valid_tx_ant && !priv->cfg->valid_rx_ant) {
		/* not using .cfg overwrite */
		radio_cfg = iwl_eeprom_query16(priv, EEPROM_RADIO_CONFIG);
		priv->cfg->valid_tx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
		priv->cfg->valid_rx_ant = EEPROM_RF_CFG_TX_ANT_MSK(radio_cfg);
		if (!priv->cfg->valid_tx_ant || !priv->cfg->valid_rx_ant) {
			IWL_ERR(priv, "Invalid chain (0X%x, 0X%x)\n",
				priv->cfg->valid_tx_ant,
				priv->cfg->valid_rx_ant);
			return -EINVAL;
		}
		IWL_INFO(priv, "Valid Tx ant: 0X%x, Valid Rx ant: 0X%x\n",
			 priv->cfg->valid_tx_ant, priv->cfg->valid_rx_ant);
	}
	/*
	 * for some special cases,
	 * EEPROM did not reflect the correct antenna setting
	 * so overwrite the valid tx/rx antenna from .cfg
	 */
	return 0;
}

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);
}

/**
 * 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_in_half_dbm)
{
	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 (round-up convert)
	 * but we also do not want to loss 1/2 dBm resolution which
	 * will impact performance
	 */
	*max_txpower_in_half_dbm = max_txpower_avg;
	return (max_txpower_avg & 0x01) + (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, s8 *max_txpower_in_half_dbm)
{
	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, max_txpower_in_half_dbm);

	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 < max_txpower_avg)) {
			/* Update regulatory-based run-time data */
			ch_info->ht40_max_power_avg = 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, s8 *max_txpower_in_half_dbm)
{
	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, max_txpower_in_half_dbm);

	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 < max_txpower_avg)) {
				/* Update regulatory-based run-time data */
				ch_info->ht40_max_power_avg = max_txpower_avg;
			}
			break;
		}
		ch_info++;
	}
	return max_txpower_avg;
}

/**
 * iwlcore_eeprom_enhanced_txpower: process enhanced tx power info
 */
static void iwlcore_eeprom_enhanced_txpower_old(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) */
	s8 max_txpower_in_half_dbm; /* (half-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);

		/*
		 * check for valid entry -
		 * different version of EEPROM might contain different set
		 * of enhanced tx power table
		 * always check for valid entry before process
		 * the information
		 */
		if (!(enhanced_txpower->flags || enhanced_txpower->channel) ||
		    enhanced_txpower->delta_20_in_40)
			continue;

		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,
						&max_txpower_in_half_dbm);
			else
				max_txpower_avg =
					iwl_update_channel_txpower(priv,
						enhanced_txpower, section,
						element,
						&max_txpower_in_half_dbm);

			/* 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;

			/*
			 * Update the tx_power_lmt_in_half_dbm to
			 * the highest power supported by any channel
			 */
			if (max_txpower_in_half_dbm >
			    priv->tx_power_lmt_in_half_dbm)
				priv->tx_power_lmt_in_half_dbm =
					max_txpower_in_half_dbm;
		}
	}
}

static void
iwlcore_eeprom_enh_txp_read_element(struct iwl_priv *priv,
				    struct iwl_eeprom_enhanced_txpwr *txp,
				    s8 max_txpower_avg)
{
	int ch_idx;
	bool is_ht40 = txp->flags & IWL_EEPROM_ENH_TXP_FL_40MHZ;
	enum ieee80211_band band;

	band = txp->flags & IWL_EEPROM_ENH_TXP_FL_BAND_52G ?
		IEEE80211_BAND_5GHZ : IEEE80211_BAND_2GHZ;

	for (ch_idx = 0; ch_idx < priv->channel_count; ch_idx++) {
		struct iwl_channel_info *ch_info = &priv->channel_info[ch_idx];

		/* update matching channel or from common data only */
		if (txp->channel != 0 && ch_info->channel != txp->channel)
			continue;

		/* update matching band only */
		if (band != ch_info->band)
			continue;

		if (ch_info->max_power_avg < max_txpower_avg && !is_ht40) {
			ch_info->max_power_avg = max_txpower_avg;
			ch_info->curr_txpow = max_txpower_avg;
			ch_info->scan_power = max_txpower_avg;
		}

		if (is_ht40 && ch_info->ht40_max_power_avg < max_txpower_avg)
			ch_info->ht40_max_power_avg = max_txpower_avg;
	}
}

#define EEPROM_TXP_OFFS	(0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT)
#define EEPROM_TXP_ENTRY_LEN sizeof(struct iwl_eeprom_enhanced_txpwr)
#define EEPROM_TXP_SZ_OFFS (0x00 | INDIRECT_ADDRESS | INDIRECT_TXP_LIMIT_SIZE)

static void iwlcore_eeprom_enhanced_txpower_new(struct iwl_priv *priv)
{
	struct iwl_eeprom_enhanced_txpwr *txp_array, *txp;
	int idx, entries;
	__le16 *txp_len;
	s8 max_txp_avg, max_txp_avg_halfdbm;

	BUILD_BUG_ON(sizeof(struct iwl_eeprom_enhanced_txpwr) != 8);

	/* the length is in 16-bit words, but we want entries */
	txp_len = (__le16 *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_SZ_OFFS);
	entries = le16_to_cpup(txp_len) * 2 / EEPROM_TXP_ENTRY_LEN;

	txp_array = (void *) iwlagn_eeprom_query_addr(priv, EEPROM_TXP_OFFS);
	for (idx = 0; idx < entries; idx++) {
		txp = &txp_array[idx];

		/* skip invalid entries */
		if (!(txp->flags & IWL_EEPROM_ENH_TXP_FL_VALID))
			continue;

		max_txp_avg = iwl_get_max_txpower_avg(priv, txp_array, idx,
						      &max_txp_avg_halfdbm);

		/*
		 * Update the user limit values values to the highest
		 * power supported by any channel
		 */
		if (max_txp_avg > priv->tx_power_user_lmt)
			priv->tx_power_user_lmt = max_txp_avg;
		if (max_txp_avg_halfdbm > priv->tx_power_lmt_in_half_dbm)
			priv->tx_power_lmt_in_half_dbm = max_txp_avg_halfdbm;

		iwlcore_eeprom_enh_txp_read_element(priv, txp, max_txp_avg);
	}
}

void iwlcore_eeprom_enhanced_txpower(struct iwl_priv *priv)
{
	if (priv->cfg->use_new_eeprom_reading)
		iwlcore_eeprom_enhanced_txpower_new(priv);
	else
		iwlcore_eeprom_enhanced_txpower_old(priv);
}