Merge branch 'for_rmk' of git://git.mnementh.co.uk/linux-2.6-im
[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.
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_bit(priv, CSR_HW_IF_CONFIG_REG,
173                                    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
174                                    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
175                                    EEPROM_SEM_TIMEOUT);
176                 if (ret >= 0) {
177                         IWL_DEBUG_IO("Acquired semaphore after %d tries.\n",
178                                 count+1);
179                         return ret;
180                 }
181         }
182
183         return ret;
184 }
185 EXPORT_SYMBOL(iwlcore_eeprom_acquire_semaphore);
186
187 void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
188 {
189         iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
190                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
191
192 }
193 EXPORT_SYMBOL(iwlcore_eeprom_release_semaphore);
194
195 const u8 *iwlcore_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
196 {
197         BUG_ON(offset >= priv->cfg->eeprom_size);
198         return &priv->eeprom[offset];
199 }
200 EXPORT_SYMBOL(iwlcore_eeprom_query_addr);
201
202 /**
203  * iwl_eeprom_init - read EEPROM contents
204  *
205  * Load the EEPROM contents from adapter into priv->eeprom
206  *
207  * NOTE:  This routine uses the non-debug IO access functions.
208  */
209 int iwl_eeprom_init(struct iwl_priv *priv)
210 {
211         u16 *e;
212         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
213         u32 r;
214         int sz = priv->cfg->eeprom_size;
215         int ret;
216         int i;
217         u16 addr;
218
219         /* allocate eeprom */
220         priv->eeprom = kzalloc(sz, GFP_KERNEL);
221         if (!priv->eeprom) {
222                 ret = -ENOMEM;
223                 goto alloc_err;
224         }
225         e = (u16 *)priv->eeprom;
226
227         ret = priv->cfg->ops->lib->eeprom_ops.verify_signature(priv);
228         if (ret < 0) {
229                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
230                 ret = -ENOENT;
231                 goto err;
232         }
233
234         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
235         ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
236         if (ret < 0) {
237                 IWL_ERROR("Failed to acquire EEPROM semaphore.\n");
238                 ret = -ENOENT;
239                 goto err;
240         }
241
242         /* eeprom is an array of 16bit values */
243         for (addr = 0; addr < sz; addr += sizeof(u16)) {
244                 _iwl_write32(priv, CSR_EEPROM_REG, addr << 1);
245                 _iwl_clear_bit(priv, CSR_EEPROM_REG, CSR_EEPROM_REG_BIT_CMD);
246
247                 for (i = 0; i < IWL_EEPROM_ACCESS_TIMEOUT;
248                                         i += IWL_EEPROM_ACCESS_DELAY) {
249                         r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
250                         if (r & CSR_EEPROM_REG_READ_VALID_MSK)
251                                 break;
252                         udelay(IWL_EEPROM_ACCESS_DELAY);
253                 }
254
255                 if (!(r & CSR_EEPROM_REG_READ_VALID_MSK)) {
256                         IWL_ERROR("Time out reading EEPROM[%d]\n", addr);
257                         ret = -ETIMEDOUT;
258                         goto done;
259                 }
260                 e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
261         }
262         ret = 0;
263 done:
264         priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
265 err:
266         if (ret)
267                 kfree(priv->eeprom);
268 alloc_err:
269         return ret;
270 }
271 EXPORT_SYMBOL(iwl_eeprom_init);
272
273 void iwl_eeprom_free(struct iwl_priv *priv)
274 {
275         kfree(priv->eeprom);
276         priv->eeprom = NULL;
277 }
278 EXPORT_SYMBOL(iwl_eeprom_free);
279
280 int iwl_eeprom_check_version(struct iwl_priv *priv)
281 {
282         return priv->cfg->ops->lib->eeprom_ops.check_version(priv);
283 }
284 EXPORT_SYMBOL(iwl_eeprom_check_version);
285
286 const u8 *iwl_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
287 {
288         return priv->cfg->ops->lib->eeprom_ops.query_addr(priv, offset);
289 }
290 EXPORT_SYMBOL(iwl_eeprom_query_addr);
291
292 u16 iwl_eeprom_query16(const struct iwl_priv *priv, size_t offset)
293 {
294         return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
295 }
296 EXPORT_SYMBOL(iwl_eeprom_query16);
297
298 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
299 {
300         const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
301                                         EEPROM_MAC_ADDRESS);
302         memcpy(mac, addr, ETH_ALEN);
303 }
304 EXPORT_SYMBOL(iwl_eeprom_get_mac);
305
306 static void iwl_init_band_reference(const struct iwl_priv *priv,
307                         int eep_band, int *eeprom_ch_count,
308                         const struct iwl_eeprom_channel **eeprom_ch_info,
309                         const u8 **eeprom_ch_index)
310 {
311         u32 offset = priv->cfg->ops->lib->
312                         eeprom_ops.regulatory_bands[eep_band - 1];
313         switch (eep_band) {
314         case 1:         /* 2.4GHz band */
315                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_1);
316                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
317                                 iwl_eeprom_query_addr(priv, offset);
318                 *eeprom_ch_index = iwl_eeprom_band_1;
319                 break;
320         case 2:         /* 4.9GHz band */
321                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_2);
322                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
323                                 iwl_eeprom_query_addr(priv, offset);
324                 *eeprom_ch_index = iwl_eeprom_band_2;
325                 break;
326         case 3:         /* 5.2GHz band */
327                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_3);
328                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
329                                 iwl_eeprom_query_addr(priv, offset);
330                 *eeprom_ch_index = iwl_eeprom_band_3;
331                 break;
332         case 4:         /* 5.5GHz band */
333                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_4);
334                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
335                                 iwl_eeprom_query_addr(priv, offset);
336                 *eeprom_ch_index = iwl_eeprom_band_4;
337                 break;
338         case 5:         /* 5.7GHz band */
339                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_5);
340                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
341                                 iwl_eeprom_query_addr(priv, offset);
342                 *eeprom_ch_index = iwl_eeprom_band_5;
343                 break;
344         case 6:         /* 2.4GHz FAT channels */
345                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_6);
346                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
347                                 iwl_eeprom_query_addr(priv, offset);
348                 *eeprom_ch_index = iwl_eeprom_band_6;
349                 break;
350         case 7:         /* 5 GHz FAT channels */
351                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_7);
352                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
353                                 iwl_eeprom_query_addr(priv, offset);
354                 *eeprom_ch_index = iwl_eeprom_band_7;
355                 break;
356         default:
357                 BUG();
358                 return;
359         }
360 }
361
362 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
363                             ? # x " " : "")
364
365 /**
366  * iwl_set_fat_chan_info - Copy fat channel info into driver's priv.
367  *
368  * Does not set up a command, or touch hardware.
369  */
370 static int iwl_set_fat_chan_info(struct iwl_priv *priv,
371                               enum ieee80211_band band, u16 channel,
372                               const struct iwl_eeprom_channel *eeprom_ch,
373                               u8 fat_extension_channel)
374 {
375         struct iwl_channel_info *ch_info;
376
377         ch_info = (struct iwl_channel_info *)
378                         iwl_get_channel_info(priv, band, channel);
379
380         if (!is_channel_valid(ch_info))
381                 return -1;
382
383         IWL_DEBUG_INFO("FAT Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
384                         " Ad-Hoc %ssupported\n",
385                         ch_info->channel,
386                         is_channel_a_band(ch_info) ?
387                         "5.2" : "2.4",
388                         CHECK_AND_PRINT(IBSS),
389                         CHECK_AND_PRINT(ACTIVE),
390                         CHECK_AND_PRINT(RADAR),
391                         CHECK_AND_PRINT(WIDE),
392                         CHECK_AND_PRINT(DFS),
393                         eeprom_ch->flags,
394                         eeprom_ch->max_power_avg,
395                         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
396                          && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
397                         "" : "not ");
398
399         ch_info->fat_eeprom = *eeprom_ch;
400         ch_info->fat_max_power_avg = eeprom_ch->max_power_avg;
401         ch_info->fat_curr_txpow = eeprom_ch->max_power_avg;
402         ch_info->fat_min_power = 0;
403         ch_info->fat_scan_power = eeprom_ch->max_power_avg;
404         ch_info->fat_flags = eeprom_ch->flags;
405         ch_info->fat_extension_channel = fat_extension_channel;
406
407         return 0;
408 }
409
410 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
411                             ? # x " " : "")
412
413 /**
414  * iwl_init_channel_map - Set up driver's info for all possible channels
415  */
416 int iwl_init_channel_map(struct iwl_priv *priv)
417 {
418         int eeprom_ch_count = 0;
419         const u8 *eeprom_ch_index = NULL;
420         const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
421         int band, ch;
422         struct iwl_channel_info *ch_info;
423
424         if (priv->channel_count) {
425                 IWL_DEBUG_INFO("Channel map already initialized.\n");
426                 return 0;
427         }
428
429         IWL_DEBUG_INFO("Initializing regulatory info from EEPROM\n");
430
431         priv->channel_count =
432             ARRAY_SIZE(iwl_eeprom_band_1) +
433             ARRAY_SIZE(iwl_eeprom_band_2) +
434             ARRAY_SIZE(iwl_eeprom_band_3) +
435             ARRAY_SIZE(iwl_eeprom_band_4) +
436             ARRAY_SIZE(iwl_eeprom_band_5);
437
438         IWL_DEBUG_INFO("Parsing data for %d channels.\n", priv->channel_count);
439
440         priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
441                                      priv->channel_count, GFP_KERNEL);
442         if (!priv->channel_info) {
443                 IWL_ERROR("Could not allocate channel_info\n");
444                 priv->channel_count = 0;
445                 return -ENOMEM;
446         }
447
448         ch_info = priv->channel_info;
449
450         /* Loop through the 5 EEPROM bands adding them in order to the
451          * channel map we maintain (that contains additional information than
452          * what just in the EEPROM) */
453         for (band = 1; band <= 5; band++) {
454
455                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
456                                         &eeprom_ch_info, &eeprom_ch_index);
457
458                 /* Loop through each band adding each of the channels */
459                 for (ch = 0; ch < eeprom_ch_count; ch++) {
460                         ch_info->channel = eeprom_ch_index[ch];
461                         ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
462                             IEEE80211_BAND_5GHZ;
463
464                         /* permanently store EEPROM's channel regulatory flags
465                          *   and max power in channel info database. */
466                         ch_info->eeprom = eeprom_ch_info[ch];
467
468                         /* Copy the run-time flags so they are there even on
469                          * invalid channels */
470                         ch_info->flags = eeprom_ch_info[ch].flags;
471                         /* First write that fat is not enabled, and then enable
472                          * one by one */
473                         ch_info->fat_extension_channel =
474                                 (IEEE80211_CHAN_NO_FAT_ABOVE |
475                                  IEEE80211_CHAN_NO_FAT_BELOW);
476
477                         if (!(is_channel_valid(ch_info))) {
478                                 IWL_DEBUG_INFO("Ch. %d Flags %x [%sGHz] - "
479                                                "No traffic\n",
480                                                ch_info->channel,
481                                                ch_info->flags,
482                                                is_channel_a_band(ch_info) ?
483                                                "5.2" : "2.4");
484                                 ch_info++;
485                                 continue;
486                         }
487
488                         /* Initialize regulatory-based run-time data */
489                         ch_info->max_power_avg = ch_info->curr_txpow =
490                             eeprom_ch_info[ch].max_power_avg;
491                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
492                         ch_info->min_power = 0;
493
494                         IWL_DEBUG_INFO("Ch. %d [%sGHz] %s%s%s%s%s%s(0x%02x %ddBm):"
495                                        " Ad-Hoc %ssupported\n",
496                                        ch_info->channel,
497                                        is_channel_a_band(ch_info) ?
498                                        "5.2" : "2.4",
499                                        CHECK_AND_PRINT_I(VALID),
500                                        CHECK_AND_PRINT_I(IBSS),
501                                        CHECK_AND_PRINT_I(ACTIVE),
502                                        CHECK_AND_PRINT_I(RADAR),
503                                        CHECK_AND_PRINT_I(WIDE),
504                                        CHECK_AND_PRINT_I(DFS),
505                                        eeprom_ch_info[ch].flags,
506                                        eeprom_ch_info[ch].max_power_avg,
507                                        ((eeprom_ch_info[ch].
508                                          flags & EEPROM_CHANNEL_IBSS)
509                                         && !(eeprom_ch_info[ch].
510                                              flags & EEPROM_CHANNEL_RADAR))
511                                        ? "" : "not ");
512
513                         /* Set the user_txpower_limit to the highest power
514                          * supported by any channel */
515                         if (eeprom_ch_info[ch].max_power_avg >
516                                                 priv->tx_power_user_lmt)
517                                 priv->tx_power_user_lmt =
518                                     eeprom_ch_info[ch].max_power_avg;
519
520                         ch_info++;
521                 }
522         }
523
524         /* Two additional EEPROM bands for 2.4 and 5 GHz FAT channels */
525         for (band = 6; band <= 7; band++) {
526                 enum ieee80211_band ieeeband;
527                 u8 fat_extension_chan;
528
529                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
530                                         &eeprom_ch_info, &eeprom_ch_index);
531
532                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
533                 ieeeband =
534                         (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
535
536                 /* Loop through each band adding each of the channels */
537                 for (ch = 0; ch < eeprom_ch_count; ch++) {
538
539                         if ((band == 6) &&
540                                 ((eeprom_ch_index[ch] == 5) ||
541                                  (eeprom_ch_index[ch] == 6) ||
542                                  (eeprom_ch_index[ch] == 7)))
543                                 /* both are allowed: above and below */
544                                 fat_extension_chan = 0;
545                         else
546                                 fat_extension_chan =
547                                         IEEE80211_CHAN_NO_FAT_BELOW;
548
549                         /* Set up driver's info for lower half */
550                         iwl_set_fat_chan_info(priv, ieeeband,
551                                                 eeprom_ch_index[ch],
552                                                 &(eeprom_ch_info[ch]),
553                                                 fat_extension_chan);
554
555                         /* Set up driver's info for upper half */
556                         iwl_set_fat_chan_info(priv, ieeeband,
557                                                 (eeprom_ch_index[ch] + 4),
558                                                 &(eeprom_ch_info[ch]),
559                                                 IEEE80211_CHAN_NO_FAT_ABOVE);
560                 }
561         }
562
563         return 0;
564 }
565 EXPORT_SYMBOL(iwl_init_channel_map);
566
567 /*
568  * iwl_free_channel_map - undo allocations in iwl_init_channel_map
569  */
570 void iwl_free_channel_map(struct iwl_priv *priv)
571 {
572         kfree(priv->channel_info);
573         priv->channel_count = 0;
574 }
575
576 /**
577  * iwl_get_channel_info - Find driver's private channel info
578  *
579  * Based on band and channel number.
580  */
581 const struct iwl_channel_info *iwl_get_channel_info(const struct iwl_priv *priv,
582                                         enum ieee80211_band band, u16 channel)
583 {
584         int i;
585
586         switch (band) {
587         case IEEE80211_BAND_5GHZ:
588                 for (i = 14; i < priv->channel_count; i++) {
589                         if (priv->channel_info[i].channel == channel)
590                                 return &priv->channel_info[i];
591                 }
592                 break;
593         case IEEE80211_BAND_2GHZ:
594                 if (channel >= 1 && channel <= 14)
595                         return &priv->channel_info[channel - 1];
596                 break;
597         default:
598                 BUG();
599         }
600
601         return NULL;
602 }
603 EXPORT_SYMBOL(iwl_get_channel_info);
604