iwlwifi: iwl_poll_{direct_}bit cleanup
[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  * Tomas Winkler <tomas.winkler@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.
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37  * modification, are permitted provided that the following conditions
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42  *  * Redistributions in binary form must reproduce the above copyright
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48  *    from this software without specific prior written permission.
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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
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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         u32 r;
213         int sz = priv->cfg->eeprom_size;
214         int ret;
215         int i;
216         u16 addr;
217
218         /* allocate eeprom */
219         priv->eeprom = kzalloc(sz, GFP_KERNEL);
220         if (!priv->eeprom) {
221                 ret = -ENOMEM;
222                 goto alloc_err;
223         }
224         e = (u16 *)priv->eeprom;
225
226         ret = priv->cfg->ops->lib->eeprom_ops.verify_signature(priv);
227         if (ret < 0) {
228                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
229                 ret = -ENOENT;
230                 goto err;
231         }
232
233         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
234         ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
235         if (ret < 0) {
236                 IWL_ERROR("Failed to acquire EEPROM semaphore.\n");
237                 ret = -ENOENT;
238                 goto err;
239         }
240
241         /* eeprom is an array of 16bit values */
242         for (addr = 0; addr < sz; addr += sizeof(u16)) {
243                 _iwl_write32(priv, CSR_EEPROM_REG, addr << 1);
244                 _iwl_clear_bit(priv, CSR_EEPROM_REG, CSR_EEPROM_REG_BIT_CMD);
245
246                 for (i = 0; i < IWL_EEPROM_ACCESS_TIMEOUT;
247                                         i += IWL_EEPROM_ACCESS_DELAY) {
248                         r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
249                         if (r & CSR_EEPROM_REG_READ_VALID_MSK)
250                                 break;
251                         udelay(IWL_EEPROM_ACCESS_DELAY);
252                 }
253
254                 if (!(r & CSR_EEPROM_REG_READ_VALID_MSK)) {
255                         IWL_ERROR("Time out reading EEPROM[%d]\n", addr);
256                         ret = -ETIMEDOUT;
257                         goto done;
258                 }
259                 e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
260         }
261         ret = 0;
262 done:
263         priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
264 err:
265         if (ret)
266                 kfree(priv->eeprom);
267 alloc_err:
268         return ret;
269 }
270 EXPORT_SYMBOL(iwl_eeprom_init);
271
272 void iwl_eeprom_free(struct iwl_priv *priv)
273 {
274         kfree(priv->eeprom);
275         priv->eeprom = NULL;
276 }
277 EXPORT_SYMBOL(iwl_eeprom_free);
278
279 int iwl_eeprom_check_version(struct iwl_priv *priv)
280 {
281         u16 eeprom_ver;
282         u16 calib_ver;
283
284         eeprom_ver = iwl_eeprom_query16(priv, EEPROM_VERSION);
285         calib_ver = priv->cfg->ops->lib->eeprom_ops.calib_version(priv);
286
287         if (eeprom_ver < priv->cfg->eeprom_ver ||
288             calib_ver < priv->cfg->eeprom_calib_ver)
289                 goto err;
290
291         return 0;
292 err:
293         IWL_ERROR("Unsupported EEPROM VER=0x%x < 0x%x CALIB=0x%x < 0x%x\n",
294                   eeprom_ver, priv->cfg->eeprom_ver,
295                   calib_ver,  priv->cfg->eeprom_calib_ver);
296         return -EINVAL;
297
298 }
299 EXPORT_SYMBOL(iwl_eeprom_check_version);
300
301 const u8 *iwl_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
302 {
303         return priv->cfg->ops->lib->eeprom_ops.query_addr(priv, offset);
304 }
305 EXPORT_SYMBOL(iwl_eeprom_query_addr);
306
307 u16 iwl_eeprom_query16(const struct iwl_priv *priv, size_t offset)
308 {
309         return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
310 }
311 EXPORT_SYMBOL(iwl_eeprom_query16);
312
313 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
314 {
315         const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
316                                         EEPROM_MAC_ADDRESS);
317         memcpy(mac, addr, ETH_ALEN);
318 }
319 EXPORT_SYMBOL(iwl_eeprom_get_mac);
320
321 static void iwl_init_band_reference(const struct iwl_priv *priv,
322                         int eep_band, int *eeprom_ch_count,
323                         const struct iwl_eeprom_channel **eeprom_ch_info,
324                         const u8 **eeprom_ch_index)
325 {
326         u32 offset = priv->cfg->ops->lib->
327                         eeprom_ops.regulatory_bands[eep_band - 1];
328         switch (eep_band) {
329         case 1:         /* 2.4GHz band */
330                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_1);
331                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
332                                 iwl_eeprom_query_addr(priv, offset);
333                 *eeprom_ch_index = iwl_eeprom_band_1;
334                 break;
335         case 2:         /* 4.9GHz band */
336                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_2);
337                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
338                                 iwl_eeprom_query_addr(priv, offset);
339                 *eeprom_ch_index = iwl_eeprom_band_2;
340                 break;
341         case 3:         /* 5.2GHz band */
342                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_3);
343                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
344                                 iwl_eeprom_query_addr(priv, offset);
345                 *eeprom_ch_index = iwl_eeprom_band_3;
346                 break;
347         case 4:         /* 5.5GHz band */
348                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_4);
349                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
350                                 iwl_eeprom_query_addr(priv, offset);
351                 *eeprom_ch_index = iwl_eeprom_band_4;
352                 break;
353         case 5:         /* 5.7GHz band */
354                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_5);
355                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
356                                 iwl_eeprom_query_addr(priv, offset);
357                 *eeprom_ch_index = iwl_eeprom_band_5;
358                 break;
359         case 6:         /* 2.4GHz FAT channels */
360                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_6);
361                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
362                                 iwl_eeprom_query_addr(priv, offset);
363                 *eeprom_ch_index = iwl_eeprom_band_6;
364                 break;
365         case 7:         /* 5 GHz FAT channels */
366                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_7);
367                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
368                                 iwl_eeprom_query_addr(priv, offset);
369                 *eeprom_ch_index = iwl_eeprom_band_7;
370                 break;
371         default:
372                 BUG();
373                 return;
374         }
375 }
376
377 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
378                             ? # x " " : "")
379
380 /**
381  * iwl_set_fat_chan_info - Copy fat channel info into driver's priv.
382  *
383  * Does not set up a command, or touch hardware.
384  */
385 static int iwl_set_fat_chan_info(struct iwl_priv *priv,
386                               enum ieee80211_band band, u16 channel,
387                               const struct iwl_eeprom_channel *eeprom_ch,
388                               u8 fat_extension_channel)
389 {
390         struct iwl_channel_info *ch_info;
391
392         ch_info = (struct iwl_channel_info *)
393                         iwl_get_channel_info(priv, band, channel);
394
395         if (!is_channel_valid(ch_info))
396                 return -1;
397
398         IWL_DEBUG_INFO("FAT Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
399                         " Ad-Hoc %ssupported\n",
400                         ch_info->channel,
401                         is_channel_a_band(ch_info) ?
402                         "5.2" : "2.4",
403                         CHECK_AND_PRINT(IBSS),
404                         CHECK_AND_PRINT(ACTIVE),
405                         CHECK_AND_PRINT(RADAR),
406                         CHECK_AND_PRINT(WIDE),
407                         CHECK_AND_PRINT(DFS),
408                         eeprom_ch->flags,
409                         eeprom_ch->max_power_avg,
410                         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
411                          && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
412                         "" : "not ");
413
414         ch_info->fat_eeprom = *eeprom_ch;
415         ch_info->fat_max_power_avg = eeprom_ch->max_power_avg;
416         ch_info->fat_curr_txpow = eeprom_ch->max_power_avg;
417         ch_info->fat_min_power = 0;
418         ch_info->fat_scan_power = eeprom_ch->max_power_avg;
419         ch_info->fat_flags = eeprom_ch->flags;
420         ch_info->fat_extension_channel = fat_extension_channel;
421
422         return 0;
423 }
424
425 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
426                             ? # x " " : "")
427
428 /**
429  * iwl_init_channel_map - Set up driver's info for all possible channels
430  */
431 int iwl_init_channel_map(struct iwl_priv *priv)
432 {
433         int eeprom_ch_count = 0;
434         const u8 *eeprom_ch_index = NULL;
435         const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
436         int band, ch;
437         struct iwl_channel_info *ch_info;
438
439         if (priv->channel_count) {
440                 IWL_DEBUG_INFO("Channel map already initialized.\n");
441                 return 0;
442         }
443
444         IWL_DEBUG_INFO("Initializing regulatory info from EEPROM\n");
445
446         priv->channel_count =
447             ARRAY_SIZE(iwl_eeprom_band_1) +
448             ARRAY_SIZE(iwl_eeprom_band_2) +
449             ARRAY_SIZE(iwl_eeprom_band_3) +
450             ARRAY_SIZE(iwl_eeprom_band_4) +
451             ARRAY_SIZE(iwl_eeprom_band_5);
452
453         IWL_DEBUG_INFO("Parsing data for %d channels.\n", priv->channel_count);
454
455         priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
456                                      priv->channel_count, GFP_KERNEL);
457         if (!priv->channel_info) {
458                 IWL_ERROR("Could not allocate channel_info\n");
459                 priv->channel_count = 0;
460                 return -ENOMEM;
461         }
462
463         ch_info = priv->channel_info;
464
465         /* Loop through the 5 EEPROM bands adding them in order to the
466          * channel map we maintain (that contains additional information than
467          * what just in the EEPROM) */
468         for (band = 1; band <= 5; band++) {
469
470                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
471                                         &eeprom_ch_info, &eeprom_ch_index);
472
473                 /* Loop through each band adding each of the channels */
474                 for (ch = 0; ch < eeprom_ch_count; ch++) {
475                         ch_info->channel = eeprom_ch_index[ch];
476                         ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
477                             IEEE80211_BAND_5GHZ;
478
479                         /* permanently store EEPROM's channel regulatory flags
480                          *   and max power in channel info database. */
481                         ch_info->eeprom = eeprom_ch_info[ch];
482
483                         /* Copy the run-time flags so they are there even on
484                          * invalid channels */
485                         ch_info->flags = eeprom_ch_info[ch].flags;
486                         /* First write that fat is not enabled, and then enable
487                          * one by one */
488                         ch_info->fat_extension_channel =
489                                 (IEEE80211_CHAN_NO_FAT_ABOVE |
490                                  IEEE80211_CHAN_NO_FAT_BELOW);
491
492                         if (!(is_channel_valid(ch_info))) {
493                                 IWL_DEBUG_INFO("Ch. %d Flags %x [%sGHz] - "
494                                                "No traffic\n",
495                                                ch_info->channel,
496                                                ch_info->flags,
497                                                is_channel_a_band(ch_info) ?
498                                                "5.2" : "2.4");
499                                 ch_info++;
500                                 continue;
501                         }
502
503                         /* Initialize regulatory-based run-time data */
504                         ch_info->max_power_avg = ch_info->curr_txpow =
505                             eeprom_ch_info[ch].max_power_avg;
506                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
507                         ch_info->min_power = 0;
508
509                         IWL_DEBUG_INFO("Ch. %d [%sGHz] %s%s%s%s%s%s(0x%02x %ddBm):"
510                                        " Ad-Hoc %ssupported\n",
511                                        ch_info->channel,
512                                        is_channel_a_band(ch_info) ?
513                                        "5.2" : "2.4",
514                                        CHECK_AND_PRINT_I(VALID),
515                                        CHECK_AND_PRINT_I(IBSS),
516                                        CHECK_AND_PRINT_I(ACTIVE),
517                                        CHECK_AND_PRINT_I(RADAR),
518                                        CHECK_AND_PRINT_I(WIDE),
519                                        CHECK_AND_PRINT_I(DFS),
520                                        eeprom_ch_info[ch].flags,
521                                        eeprom_ch_info[ch].max_power_avg,
522                                        ((eeprom_ch_info[ch].
523                                          flags & EEPROM_CHANNEL_IBSS)
524                                         && !(eeprom_ch_info[ch].
525                                              flags & EEPROM_CHANNEL_RADAR))
526                                        ? "" : "not ");
527
528                         /* Set the user_txpower_limit to the highest power
529                          * supported by any channel */
530                         if (eeprom_ch_info[ch].max_power_avg >
531                                                 priv->tx_power_user_lmt)
532                                 priv->tx_power_user_lmt =
533                                     eeprom_ch_info[ch].max_power_avg;
534
535                         ch_info++;
536                 }
537         }
538
539         /* Two additional EEPROM bands for 2.4 and 5 GHz FAT channels */
540         for (band = 6; band <= 7; band++) {
541                 enum ieee80211_band ieeeband;
542                 u8 fat_extension_chan;
543
544                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
545                                         &eeprom_ch_info, &eeprom_ch_index);
546
547                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
548                 ieeeband =
549                         (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
550
551                 /* Loop through each band adding each of the channels */
552                 for (ch = 0; ch < eeprom_ch_count; ch++) {
553
554                         if ((band == 6) &&
555                                 ((eeprom_ch_index[ch] == 5) ||
556                                  (eeprom_ch_index[ch] == 6) ||
557                                  (eeprom_ch_index[ch] == 7)))
558                                 /* both are allowed: above and below */
559                                 fat_extension_chan = 0;
560                         else
561                                 fat_extension_chan =
562                                         IEEE80211_CHAN_NO_FAT_BELOW;
563
564                         /* Set up driver's info for lower half */
565                         iwl_set_fat_chan_info(priv, ieeeband,
566                                                 eeprom_ch_index[ch],
567                                                 &(eeprom_ch_info[ch]),
568                                                 fat_extension_chan);
569
570                         /* Set up driver's info for upper half */
571                         iwl_set_fat_chan_info(priv, ieeeband,
572                                                 (eeprom_ch_index[ch] + 4),
573                                                 &(eeprom_ch_info[ch]),
574                                                 IEEE80211_CHAN_NO_FAT_ABOVE);
575                 }
576         }
577
578         return 0;
579 }
580 EXPORT_SYMBOL(iwl_init_channel_map);
581
582 /*
583  * iwl_free_channel_map - undo allocations in iwl_init_channel_map
584  */
585 void iwl_free_channel_map(struct iwl_priv *priv)
586 {
587         kfree(priv->channel_info);
588         priv->channel_count = 0;
589 }
590
591 /**
592  * iwl_get_channel_info - Find driver's private channel info
593  *
594  * Based on band and channel number.
595  */
596 const struct iwl_channel_info *iwl_get_channel_info(const struct iwl_priv *priv,
597                                         enum ieee80211_band band, u16 channel)
598 {
599         int i;
600
601         switch (band) {
602         case IEEE80211_BAND_5GHZ:
603                 for (i = 14; i < priv->channel_count; i++) {
604                         if (priv->channel_info[i].channel == channel)
605                                 return &priv->channel_info[i];
606                 }
607                 break;
608         case IEEE80211_BAND_2GHZ:
609                 if (channel >= 1 && channel <= 14)
610                         return &priv->channel_info[channel - 1];
611                 break;
612         default:
613                 BUG();
614         }
615
616         return NULL;
617 }
618 EXPORT_SYMBOL(iwl_get_channel_info);
619