Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / drivers / net / wireless / iwlwifi / iwl-eeprom.c
1 /******************************************************************************
2  *
3  * This file is provided under a dual BSD/GPLv2 license.  When using or
4  * redistributing this file, you may do so under either license.
5  *
6  * GPL LICENSE SUMMARY
7  *
8  * Copyright(c) 2008 Intel Corporation. All rights reserved.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of version 2 of the GNU General Public License as
12  * published by the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22  * USA
23  *
24  * The full GNU General Public License is included in this distribution
25  * in the file called LICENSE.GPL.
26  *
27  * Contact Information:
28  *  Intel Linux Wireless <ilw@linux.intel.com>
29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30  *
31  * BSD LICENSE
32  *
33  * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
34  * All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  *
40  *  * Redistributions of source code must retain the above copyright
41  *    notice, this list of conditions and the following disclaimer.
42  *  * Redistributions in binary form must reproduce the above copyright
43  *    notice, this list of conditions and the following disclaimer in
44  *    the documentation and/or other materials provided with the
45  *    distribution.
46  *  * Neither the name Intel Corporation nor the names of its
47  *    contributors may be used to endorse or promote products derived
48  *    from this software without specific prior written permission.
49  *
50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61  *****************************************************************************/
62
63
64 #include <linux/kernel.h>
65 #include <linux/module.h>
66 #include <linux/init.h>
67
68 #include <net/mac80211.h>
69
70 #include "iwl-commands.h"
71 #include "iwl-dev.h"
72 #include "iwl-core.h"
73 #include "iwl-debug.h"
74 #include "iwl-eeprom.h"
75 #include "iwl-io.h"
76
77 /************************** EEPROM BANDS ****************************
78  *
79  * The iwl_eeprom_band definitions below provide the mapping from the
80  * EEPROM contents to the specific channel number supported for each
81  * band.
82  *
83  * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
84  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
85  * The specific geography and calibration information for that channel
86  * is contained in the eeprom map itself.
87  *
88  * During init, we copy the eeprom information and channel map
89  * information into priv->channel_info_24/52 and priv->channel_map_24/52
90  *
91  * channel_map_24/52 provides the index in the channel_info array for a
92  * given channel.  We have to have two separate maps as there is channel
93  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
94  * band_2
95  *
96  * A value of 0xff stored in the channel_map indicates that the channel
97  * is not supported by the hardware at all.
98  *
99  * A value of 0xfe in the channel_map indicates that the channel is not
100  * valid for Tx with the current hardware.  This means that
101  * while the system can tune and receive on a given channel, it may not
102  * be able to associate or transmit any frames on that
103  * channel.  There is no corresponding channel information for that
104  * entry.
105  *
106  *********************************************************************/
107
108 /* 2.4 GHz */
109 const u8 iwl_eeprom_band_1[14] = {
110         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
111 };
112
113 /* 5.2 GHz bands */
114 static const u8 iwl_eeprom_band_2[] = { /* 4915-5080MHz */
115         183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
116 };
117
118 static const u8 iwl_eeprom_band_3[] = { /* 5170-5320MHz */
119         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
120 };
121
122 static const u8 iwl_eeprom_band_4[] = { /* 5500-5700MHz */
123         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
124 };
125
126 static const u8 iwl_eeprom_band_5[] = { /* 5725-5825MHz */
127         145, 149, 153, 157, 161, 165
128 };
129
130 static const u8 iwl_eeprom_band_6[] = {       /* 2.4 FAT channel */
131         1, 2, 3, 4, 5, 6, 7
132 };
133
134 static const u8 iwl_eeprom_band_7[] = {       /* 5.2 FAT channel */
135         36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
136 };
137
138 /******************************************************************************
139  *
140  * EEPROM related functions
141  *
142 ******************************************************************************/
143
144 int iwlcore_eeprom_verify_signature(struct iwl_priv *priv)
145 {
146         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
147         if ((gp & CSR_EEPROM_GP_VALID_MSK) == CSR_EEPROM_GP_BAD_SIGNATURE) {
148                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
149                 return -ENOENT;
150         }
151         return 0;
152 }
153 EXPORT_SYMBOL(iwlcore_eeprom_verify_signature);
154
155 /*
156  * The device's EEPROM semaphore prevents conflicts between driver and uCode
157  * when accessing the EEPROM; each access is a series of pulses to/from the
158  * EEPROM chip, not a single event, so even reads could conflict if they
159  * weren't arbitrated by the semaphore.
160  */
161 int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
162 {
163         u16 count;
164         int ret;
165
166         for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
167                 /* Request semaphore */
168                 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
169                             CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
170
171                 /* See if we got it */
172                 ret = iwl_poll_direct_bit(priv, CSR_HW_IF_CONFIG_REG,
173                                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
174                                 EEPROM_SEM_TIMEOUT);
175                 if (ret >= 0) {
176                         IWL_DEBUG_IO("Acquired semaphore after %d tries.\n",
177                                 count+1);
178                         return ret;
179                 }
180         }
181
182         return ret;
183 }
184 EXPORT_SYMBOL(iwlcore_eeprom_acquire_semaphore);
185
186 void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
187 {
188         iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
189                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
190
191 }
192 EXPORT_SYMBOL(iwlcore_eeprom_release_semaphore);
193
194 const u8 *iwlcore_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
195 {
196         BUG_ON(offset >= priv->cfg->eeprom_size);
197         return &priv->eeprom[offset];
198 }
199 EXPORT_SYMBOL(iwlcore_eeprom_query_addr);
200
201 /**
202  * iwl_eeprom_init - read EEPROM contents
203  *
204  * Load the EEPROM contents from adapter into priv->eeprom
205  *
206  * NOTE:  This routine uses the non-debug IO access functions.
207  */
208 int iwl_eeprom_init(struct iwl_priv *priv)
209 {
210         u16 *e;
211         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
212         int sz = priv->cfg->eeprom_size;
213         int ret;
214         u16 addr;
215
216         /* allocate eeprom */
217         priv->eeprom = kzalloc(sz, GFP_KERNEL);
218         if (!priv->eeprom) {
219                 ret = -ENOMEM;
220                 goto alloc_err;
221         }
222         e = (u16 *)priv->eeprom;
223
224         ret = priv->cfg->ops->lib->eeprom_ops.verify_signature(priv);
225         if (ret < 0) {
226                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
227                 ret = -ENOENT;
228                 goto err;
229         }
230
231         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
232         ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
233         if (ret < 0) {
234                 IWL_ERROR("Failed to acquire EEPROM semaphore.\n");
235                 ret = -ENOENT;
236                 goto err;
237         }
238
239         /* eeprom is an array of 16bit values */
240         for (addr = 0; addr < sz; addr += sizeof(u16)) {
241                 u32 r;
242
243                 _iwl_write32(priv, CSR_EEPROM_REG,
244                              CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
245
246                 ret = iwl_poll_direct_bit(priv, CSR_EEPROM_REG,
247                                           CSR_EEPROM_REG_READ_VALID_MSK,
248                                           IWL_EEPROM_ACCESS_TIMEOUT);
249                 if (ret < 0) {
250                         IWL_ERROR("Time out reading EEPROM[%d]\n", addr);
251                         goto done;
252                 }
253                 r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
254                 e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
255         }
256         ret = 0;
257 done:
258         priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
259 err:
260         if (ret)
261                 kfree(priv->eeprom);
262 alloc_err:
263         return ret;
264 }
265 EXPORT_SYMBOL(iwl_eeprom_init);
266
267 void iwl_eeprom_free(struct iwl_priv *priv)
268 {
269         kfree(priv->eeprom);
270         priv->eeprom = NULL;
271 }
272 EXPORT_SYMBOL(iwl_eeprom_free);
273
274 int iwl_eeprom_check_version(struct iwl_priv *priv)
275 {
276         u16 eeprom_ver;
277         u16 calib_ver;
278
279         eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
280         calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);
281
282         if (eeprom_ver < priv->cfg->eeprom_ver ||
283             calib_ver < priv->cfg->eeprom_calib_ver)
284                 goto err;
285
286         return 0;
287 err:
288         IWL_ERROR("Unsupported EEPROM VER=0x%x < 0x%x CALIB=0x%x < 0x%x\n",
289                   eeprom_ver, priv->cfg->eeprom_ver,
290                   calib_ver,  priv->cfg->eeprom_calib_ver);
291         return -EINVAL;
292
293 }
294 EXPORT_SYMBOL(iwl_eeprom_check_version);
295
296 const u8 *iwl_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
297 {
298         return priv->cfg->ops->lib->eeprom_ops.query_addr(priv, offset);
299 }
300 EXPORT_SYMBOL(iwl_eeprom_query_addr);
301
302 u16 iwl_eeprom_query16(const struct iwl_priv *priv, size_t offset)
303 {
304         return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
305 }
306 EXPORT_SYMBOL(iwl_eeprom_query16);
307
308 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
309 {
310         const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
311                                         EEPROM_MAC_ADDRESS);
312         memcpy(mac, addr, ETH_ALEN);
313 }
314 EXPORT_SYMBOL(iwl_eeprom_get_mac);
315
316 static void iwl_init_band_reference(const struct iwl_priv *priv,
317                         int eep_band, int *eeprom_ch_count,
318                         const struct iwl_eeprom_channel **eeprom_ch_info,
319                         const u8 **eeprom_ch_index)
320 {
321         u32 offset = priv->cfg->ops->lib->
322                         eeprom_ops.regulatory_bands[eep_band - 1];
323         switch (eep_band) {
324         case 1:         /* 2.4GHz band */
325                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_1);
326                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
327                                 iwl_eeprom_query_addr(priv, offset);
328                 *eeprom_ch_index = iwl_eeprom_band_1;
329                 break;
330         case 2:         /* 4.9GHz band */
331                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_2);
332                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
333                                 iwl_eeprom_query_addr(priv, offset);
334                 *eeprom_ch_index = iwl_eeprom_band_2;
335                 break;
336         case 3:         /* 5.2GHz band */
337                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_3);
338                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
339                                 iwl_eeprom_query_addr(priv, offset);
340                 *eeprom_ch_index = iwl_eeprom_band_3;
341                 break;
342         case 4:         /* 5.5GHz band */
343                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_4);
344                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
345                                 iwl_eeprom_query_addr(priv, offset);
346                 *eeprom_ch_index = iwl_eeprom_band_4;
347                 break;
348         case 5:         /* 5.7GHz band */
349                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_5);
350                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
351                                 iwl_eeprom_query_addr(priv, offset);
352                 *eeprom_ch_index = iwl_eeprom_band_5;
353                 break;
354         case 6:         /* 2.4GHz FAT channels */
355                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_6);
356                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
357                                 iwl_eeprom_query_addr(priv, offset);
358                 *eeprom_ch_index = iwl_eeprom_band_6;
359                 break;
360         case 7:         /* 5 GHz FAT channels */
361                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_7);
362                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
363                                 iwl_eeprom_query_addr(priv, offset);
364                 *eeprom_ch_index = iwl_eeprom_band_7;
365                 break;
366         default:
367                 BUG();
368                 return;
369         }
370 }
371
372 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
373                             ? # x " " : "")
374
375 /**
376  * iwl_set_fat_chan_info - Copy fat channel info into driver's priv.
377  *
378  * Does not set up a command, or touch hardware.
379  */
380 static int iwl_set_fat_chan_info(struct iwl_priv *priv,
381                               enum ieee80211_band band, u16 channel,
382                               const struct iwl_eeprom_channel *eeprom_ch,
383                               u8 fat_extension_channel)
384 {
385         struct iwl_channel_info *ch_info;
386
387         ch_info = (struct iwl_channel_info *)
388                         iwl_get_channel_info(priv, band, channel);
389
390         if (!is_channel_valid(ch_info))
391                 return -1;
392
393         IWL_DEBUG_INFO("FAT Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
394                         " Ad-Hoc %ssupported\n",
395                         ch_info->channel,
396                         is_channel_a_band(ch_info) ?
397                         "5.2" : "2.4",
398                         CHECK_AND_PRINT(IBSS),
399                         CHECK_AND_PRINT(ACTIVE),
400                         CHECK_AND_PRINT(RADAR),
401                         CHECK_AND_PRINT(WIDE),
402                         CHECK_AND_PRINT(DFS),
403                         eeprom_ch->flags,
404                         eeprom_ch->max_power_avg,
405                         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
406                          && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
407                         "" : "not ");
408
409         ch_info->fat_eeprom = *eeprom_ch;
410         ch_info->fat_max_power_avg = eeprom_ch->max_power_avg;
411         ch_info->fat_curr_txpow = eeprom_ch->max_power_avg;
412         ch_info->fat_min_power = 0;
413         ch_info->fat_scan_power = eeprom_ch->max_power_avg;
414         ch_info->fat_flags = eeprom_ch->flags;
415         ch_info->fat_extension_channel = fat_extension_channel;
416
417         return 0;
418 }
419
420 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
421                             ? # x " " : "")
422
423 /**
424  * iwl_init_channel_map - Set up driver's info for all possible channels
425  */
426 int iwl_init_channel_map(struct iwl_priv *priv)
427 {
428         int eeprom_ch_count = 0;
429         const u8 *eeprom_ch_index = NULL;
430         const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
431         int band, ch;
432         struct iwl_channel_info *ch_info;
433
434         if (priv->channel_count) {
435                 IWL_DEBUG_INFO("Channel map already initialized.\n");
436                 return 0;
437         }
438
439         IWL_DEBUG_INFO("Initializing regulatory info from EEPROM\n");
440
441         priv->channel_count =
442             ARRAY_SIZE(iwl_eeprom_band_1) +
443             ARRAY_SIZE(iwl_eeprom_band_2) +
444             ARRAY_SIZE(iwl_eeprom_band_3) +
445             ARRAY_SIZE(iwl_eeprom_band_4) +
446             ARRAY_SIZE(iwl_eeprom_band_5);
447
448         IWL_DEBUG_INFO("Parsing data for %d channels.\n", priv->channel_count);
449
450         priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
451                                      priv->channel_count, GFP_KERNEL);
452         if (!priv->channel_info) {
453                 IWL_ERROR("Could not allocate channel_info\n");
454                 priv->channel_count = 0;
455                 return -ENOMEM;
456         }
457
458         ch_info = priv->channel_info;
459
460         /* Loop through the 5 EEPROM bands adding them in order to the
461          * channel map we maintain (that contains additional information than
462          * what just in the EEPROM) */
463         for (band = 1; band <= 5; band++) {
464
465                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
466                                         &eeprom_ch_info, &eeprom_ch_index);
467
468                 /* Loop through each band adding each of the channels */
469                 for (ch = 0; ch < eeprom_ch_count; ch++) {
470                         ch_info->channel = eeprom_ch_index[ch];
471                         ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
472                             IEEE80211_BAND_5GHZ;
473
474                         /* permanently store EEPROM's channel regulatory flags
475                          *   and max power in channel info database. */
476                         ch_info->eeprom = eeprom_ch_info[ch];
477
478                         /* Copy the run-time flags so they are there even on
479                          * invalid channels */
480                         ch_info->flags = eeprom_ch_info[ch].flags;
481                         /* First write that fat is not enabled, and then enable
482                          * one by one */
483                         ch_info->fat_extension_channel =
484                                 (IEEE80211_CHAN_NO_FAT_ABOVE |
485                                  IEEE80211_CHAN_NO_FAT_BELOW);
486
487                         if (!(is_channel_valid(ch_info))) {
488                                 IWL_DEBUG_INFO("Ch. %d Flags %x [%sGHz] - "
489                                                "No traffic\n",
490                                                ch_info->channel,
491                                                ch_info->flags,
492                                                is_channel_a_band(ch_info) ?
493                                                "5.2" : "2.4");
494                                 ch_info++;
495                                 continue;
496                         }
497
498                         /* Initialize regulatory-based run-time data */
499                         ch_info->max_power_avg = ch_info->curr_txpow =
500                             eeprom_ch_info[ch].max_power_avg;
501                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
502                         ch_info->min_power = 0;
503
504                         IWL_DEBUG_INFO("Ch. %d [%sGHz] %s%s%s%s%s%s(0x%02x %ddBm):"
505                                        " Ad-Hoc %ssupported\n",
506                                        ch_info->channel,
507                                        is_channel_a_band(ch_info) ?
508                                        "5.2" : "2.4",
509                                        CHECK_AND_PRINT_I(VALID),
510                                        CHECK_AND_PRINT_I(IBSS),
511                                        CHECK_AND_PRINT_I(ACTIVE),
512                                        CHECK_AND_PRINT_I(RADAR),
513                                        CHECK_AND_PRINT_I(WIDE),
514                                        CHECK_AND_PRINT_I(DFS),
515                                        eeprom_ch_info[ch].flags,
516                                        eeprom_ch_info[ch].max_power_avg,
517                                        ((eeprom_ch_info[ch].
518                                          flags & EEPROM_CHANNEL_IBSS)
519                                         && !(eeprom_ch_info[ch].
520                                              flags & EEPROM_CHANNEL_RADAR))
521                                        ? "" : "not ");
522
523                         /* Set the user_txpower_limit to the highest power
524                          * supported by any channel */
525                         if (eeprom_ch_info[ch].max_power_avg >
526                                                 priv->tx_power_user_lmt)
527                                 priv->tx_power_user_lmt =
528                                     eeprom_ch_info[ch].max_power_avg;
529
530                         ch_info++;
531                 }
532         }
533
534         /* Two additional EEPROM bands for 2.4 and 5 GHz FAT channels */
535         for (band = 6; band <= 7; band++) {
536                 enum ieee80211_band ieeeband;
537                 u8 fat_extension_chan;
538
539                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
540                                         &eeprom_ch_info, &eeprom_ch_index);
541
542                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
543                 ieeeband =
544                         (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
545
546                 /* Loop through each band adding each of the channels */
547                 for (ch = 0; ch < eeprom_ch_count; ch++) {
548
549                         if ((band == 6) &&
550                                 ((eeprom_ch_index[ch] == 5) ||
551                                  (eeprom_ch_index[ch] == 6) ||
552                                  (eeprom_ch_index[ch] == 7)))
553                                 /* both are allowed: above and below */
554                                 fat_extension_chan = 0;
555                         else
556                                 fat_extension_chan =
557                                         IEEE80211_CHAN_NO_FAT_BELOW;
558
559                         /* Set up driver's info for lower half */
560                         iwl_set_fat_chan_info(priv, ieeeband,
561                                                 eeprom_ch_index[ch],
562                                                 &(eeprom_ch_info[ch]),
563                                                 fat_extension_chan);
564
565                         /* Set up driver's info for upper half */
566                         iwl_set_fat_chan_info(priv, ieeeband,
567                                                 (eeprom_ch_index[ch] + 4),
568                                                 &(eeprom_ch_info[ch]),
569                                                 IEEE80211_CHAN_NO_FAT_ABOVE);
570                 }
571         }
572
573         return 0;
574 }
575 EXPORT_SYMBOL(iwl_init_channel_map);
576
577 /*
578  * iwl_free_channel_map - undo allocations in iwl_init_channel_map
579  */
580 void iwl_free_channel_map(struct iwl_priv *priv)
581 {
582         kfree(priv->channel_info);
583         priv->channel_count = 0;
584 }
585
586 /**
587  * iwl_get_channel_info - Find driver's private channel info
588  *
589  * Based on band and channel number.
590  */
591 const struct iwl_channel_info *iwl_get_channel_info(const struct iwl_priv *priv,
592                                         enum ieee80211_band band, u16 channel)
593 {
594         int i;
595
596         switch (band) {
597         case IEEE80211_BAND_5GHZ:
598                 for (i = 14; i < priv->channel_count; i++) {
599                         if (priv->channel_info[i].channel == channel)
600                                 return &priv->channel_info[i];
601                 }
602                 break;
603         case IEEE80211_BAND_2GHZ:
604                 if (channel >= 1 && channel <= 14)
605                         return &priv->channel_info[channel - 1];
606                 break;
607         default:
608                 BUG();
609         }
610
611         return NULL;
612 }
613 EXPORT_SYMBOL(iwl_get_channel_info);
614