Merge branch 'for-rmk' of git://aeryn.fluff.org.uk/bjdooks/linux
[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/version.h>
67 #include <linux/init.h>
68
69 #include <net/mac80211.h>
70
71 #include "iwl-commands.h"
72 #include "iwl-dev.h"
73 #include "iwl-core.h"
74 #include "iwl-debug.h"
75 #include "iwl-eeprom.h"
76 #include "iwl-io.h"
77
78 /************************** EEPROM BANDS ****************************
79  *
80  * The iwl_eeprom_band definitions below provide the mapping from the
81  * EEPROM contents to the specific channel number supported for each
82  * band.
83  *
84  * For example, iwl_priv->eeprom.band_3_channels[4] from the band_3
85  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
86  * The specific geography and calibration information for that channel
87  * is contained in the eeprom map itself.
88  *
89  * During init, we copy the eeprom information and channel map
90  * information into priv->channel_info_24/52 and priv->channel_map_24/52
91  *
92  * channel_map_24/52 provides the index in the channel_info array for a
93  * given channel.  We have to have two separate maps as there is channel
94  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
95  * band_2
96  *
97  * A value of 0xff stored in the channel_map indicates that the channel
98  * is not supported by the hardware at all.
99  *
100  * A value of 0xfe in the channel_map indicates that the channel is not
101  * valid for Tx with the current hardware.  This means that
102  * while the system can tune and receive on a given channel, it may not
103  * be able to associate or transmit any frames on that
104  * channel.  There is no corresponding channel information for that
105  * entry.
106  *
107  *********************************************************************/
108
109 /* 2.4 GHz */
110 const u8 iwl_eeprom_band_1[14] = {
111         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
112 };
113
114 /* 5.2 GHz bands */
115 static const u8 iwl_eeprom_band_2[] = { /* 4915-5080MHz */
116         183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
117 };
118
119 static const u8 iwl_eeprom_band_3[] = { /* 5170-5320MHz */
120         34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
121 };
122
123 static const u8 iwl_eeprom_band_4[] = { /* 5500-5700MHz */
124         100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
125 };
126
127 static const u8 iwl_eeprom_band_5[] = { /* 5725-5825MHz */
128         145, 149, 153, 157, 161, 165
129 };
130
131 static const u8 iwl_eeprom_band_6[] = {       /* 2.4 FAT channel */
132         1, 2, 3, 4, 5, 6, 7
133 };
134
135 static const u8 iwl_eeprom_band_7[] = {       /* 5.2 FAT channel */
136         36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
137 };
138
139 /******************************************************************************
140  *
141  * EEPROM related functions
142  *
143 ******************************************************************************/
144
145 int iwlcore_eeprom_verify_signature(struct iwl_priv *priv)
146 {
147         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
148         if ((gp & CSR_EEPROM_GP_VALID_MSK) == CSR_EEPROM_GP_BAD_SIGNATURE) {
149                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x", gp);
150                 return -ENOENT;
151         }
152         return 0;
153 }
154 EXPORT_SYMBOL(iwlcore_eeprom_verify_signature);
155
156 /*
157  * The device's EEPROM semaphore prevents conflicts between driver and uCode
158  * when accessing the EEPROM; each access is a series of pulses to/from the
159  * EEPROM chip, not a single event, so even reads could conflict if they
160  * weren't arbitrated by the semaphore.
161  */
162 int iwlcore_eeprom_acquire_semaphore(struct iwl_priv *priv)
163 {
164         u16 count;
165         int ret;
166
167         for (count = 0; count < EEPROM_SEM_RETRY_LIMIT; count++) {
168                 /* Request semaphore */
169                 iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
170                             CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
171
172                 /* See if we got it */
173                 ret = iwl_poll_bit(priv, CSR_HW_IF_CONFIG_REG,
174                                    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
175                                    CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM,
176                                    EEPROM_SEM_TIMEOUT);
177                 if (ret >= 0) {
178                         IWL_DEBUG_IO("Acquired semaphore after %d tries.\n",
179                                 count+1);
180                         return ret;
181                 }
182         }
183
184         return ret;
185 }
186 EXPORT_SYMBOL(iwlcore_eeprom_acquire_semaphore);
187
188 void iwlcore_eeprom_release_semaphore(struct iwl_priv *priv)
189 {
190         iwl_clear_bit(priv, CSR_HW_IF_CONFIG_REG,
191                 CSR_HW_IF_CONFIG_REG_BIT_EEPROM_OWN_SEM);
192
193 }
194 EXPORT_SYMBOL(iwlcore_eeprom_release_semaphore);
195
196 const u8 *iwlcore_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
197 {
198         BUG_ON(offset >= priv->cfg->eeprom_size);
199         return &priv->eeprom[offset];
200 }
201 EXPORT_SYMBOL(iwlcore_eeprom_query_addr);
202
203 /**
204  * iwl_eeprom_init - read EEPROM contents
205  *
206  * Load the EEPROM contents from adapter into priv->eeprom
207  *
208  * NOTE:  This routine uses the non-debug IO access functions.
209  */
210 int iwl_eeprom_init(struct iwl_priv *priv)
211 {
212         u16 *e;
213         u32 gp = iwl_read32(priv, CSR_EEPROM_GP);
214         u32 r;
215         int sz = priv->cfg->eeprom_size;
216         int ret;
217         int i;
218         u16 addr;
219
220         /* allocate eeprom */
221         priv->eeprom = kzalloc(sz, GFP_KERNEL);
222         if (!priv->eeprom) {
223                 ret = -ENOMEM;
224                 goto alloc_err;
225         }
226         e = (u16 *)priv->eeprom;
227
228         ret = priv->cfg->ops->lib->eeprom_ops.verify_signature(priv);
229         if (ret < 0) {
230                 IWL_ERROR("EEPROM not found, EEPROM_GP=0x%08x", gp);
231                 ret = -ENOENT;
232                 goto err;
233         }
234
235         /* Make sure driver (instead of uCode) is allowed to read EEPROM */
236         ret = priv->cfg->ops->lib->eeprom_ops.acquire_semaphore(priv);
237         if (ret < 0) {
238                 IWL_ERROR("Failed to acquire EEPROM semaphore.\n");
239                 ret = -ENOENT;
240                 goto err;
241         }
242
243         /* eeprom is an array of 16bit values */
244         for (addr = 0; addr < sz; addr += sizeof(u16)) {
245                 _iwl_write32(priv, CSR_EEPROM_REG, addr << 1);
246                 _iwl_clear_bit(priv, CSR_EEPROM_REG, CSR_EEPROM_REG_BIT_CMD);
247
248                 for (i = 0; i < IWL_EEPROM_ACCESS_TIMEOUT;
249                                         i += IWL_EEPROM_ACCESS_DELAY) {
250                         r = _iwl_read_direct32(priv, CSR_EEPROM_REG);
251                         if (r & CSR_EEPROM_REG_READ_VALID_MSK)
252                                 break;
253                         udelay(IWL_EEPROM_ACCESS_DELAY);
254                 }
255
256                 if (!(r & CSR_EEPROM_REG_READ_VALID_MSK)) {
257                         IWL_ERROR("Time out reading EEPROM[%d]", addr);
258                         ret = -ETIMEDOUT;
259                         goto done;
260                 }
261                 e[addr / 2] = le16_to_cpu((__force __le16)(r >> 16));
262         }
263         ret = 0;
264 done:
265         priv->cfg->ops->lib->eeprom_ops.release_semaphore(priv);
266 err:
267         if (ret)
268                 kfree(priv->eeprom);
269 alloc_err:
270         return ret;
271 }
272 EXPORT_SYMBOL(iwl_eeprom_init);
273
274 void iwl_eeprom_free(struct iwl_priv *priv)
275 {
276         kfree(priv->eeprom);
277         priv->eeprom = NULL;
278 }
279 EXPORT_SYMBOL(iwl_eeprom_free);
280
281 int iwl_eeprom_check_version(struct iwl_priv *priv)
282 {
283         return priv->cfg->ops->lib->eeprom_ops.check_version(priv);
284 }
285 EXPORT_SYMBOL(iwl_eeprom_check_version);
286
287 const u8 *iwl_eeprom_query_addr(const struct iwl_priv *priv, size_t offset)
288 {
289         return priv->cfg->ops->lib->eeprom_ops.query_addr(priv, offset);
290 }
291 EXPORT_SYMBOL(iwl_eeprom_query_addr);
292
293 u16 iwl_eeprom_query16(const struct iwl_priv *priv, size_t offset)
294 {
295         return (u16)priv->eeprom[offset] | ((u16)priv->eeprom[offset + 1] << 8);
296 }
297 EXPORT_SYMBOL(iwl_eeprom_query16);
298
299 void iwl_eeprom_get_mac(const struct iwl_priv *priv, u8 *mac)
300 {
301         const u8 *addr = priv->cfg->ops->lib->eeprom_ops.query_addr(priv,
302                                         EEPROM_MAC_ADDRESS);
303         memcpy(mac, addr, ETH_ALEN);
304 }
305 EXPORT_SYMBOL(iwl_eeprom_get_mac);
306
307 static void iwl_init_band_reference(const struct iwl_priv *priv,
308                         int eep_band, int *eeprom_ch_count,
309                         const struct iwl_eeprom_channel **eeprom_ch_info,
310                         const u8 **eeprom_ch_index)
311 {
312         u32 offset = priv->cfg->ops->lib->
313                         eeprom_ops.regulatory_bands[eep_band - 1];
314         switch (eep_band) {
315         case 1:         /* 2.4GHz band */
316                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_1);
317                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
318                                 iwl_eeprom_query_addr(priv, offset);
319                 *eeprom_ch_index = iwl_eeprom_band_1;
320                 break;
321         case 2:         /* 4.9GHz band */
322                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_2);
323                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
324                                 iwl_eeprom_query_addr(priv, offset);
325                 *eeprom_ch_index = iwl_eeprom_band_2;
326                 break;
327         case 3:         /* 5.2GHz band */
328                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_3);
329                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
330                                 iwl_eeprom_query_addr(priv, offset);
331                 *eeprom_ch_index = iwl_eeprom_band_3;
332                 break;
333         case 4:         /* 5.5GHz band */
334                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_4);
335                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
336                                 iwl_eeprom_query_addr(priv, offset);
337                 *eeprom_ch_index = iwl_eeprom_band_4;
338                 break;
339         case 5:         /* 5.7GHz band */
340                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_5);
341                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
342                                 iwl_eeprom_query_addr(priv, offset);
343                 *eeprom_ch_index = iwl_eeprom_band_5;
344                 break;
345         case 6:         /* 2.4GHz FAT channels */
346                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_6);
347                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
348                                 iwl_eeprom_query_addr(priv, offset);
349                 *eeprom_ch_index = iwl_eeprom_band_6;
350                 break;
351         case 7:         /* 5 GHz FAT channels */
352                 *eeprom_ch_count = ARRAY_SIZE(iwl_eeprom_band_7);
353                 *eeprom_ch_info = (struct iwl_eeprom_channel *)
354                                 iwl_eeprom_query_addr(priv, offset);
355                 *eeprom_ch_index = iwl_eeprom_band_7;
356                 break;
357         default:
358                 BUG();
359                 return;
360         }
361 }
362
363 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
364                             ? # x " " : "")
365
366 /**
367  * iwl_set_fat_chan_info - Copy fat channel info into driver's priv.
368  *
369  * Does not set up a command, or touch hardware.
370  */
371 static int iwl_set_fat_chan_info(struct iwl_priv *priv,
372                               enum ieee80211_band band, u16 channel,
373                               const struct iwl_eeprom_channel *eeprom_ch,
374                               u8 fat_extension_channel)
375 {
376         struct iwl_channel_info *ch_info;
377
378         ch_info = (struct iwl_channel_info *)
379                         iwl_get_channel_info(priv, band, channel);
380
381         if (!is_channel_valid(ch_info))
382                 return -1;
383
384         IWL_DEBUG_INFO("FAT Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
385                         " Ad-Hoc %ssupported\n",
386                         ch_info->channel,
387                         is_channel_a_band(ch_info) ?
388                         "5.2" : "2.4",
389                         CHECK_AND_PRINT(IBSS),
390                         CHECK_AND_PRINT(ACTIVE),
391                         CHECK_AND_PRINT(RADAR),
392                         CHECK_AND_PRINT(WIDE),
393                         CHECK_AND_PRINT(DFS),
394                         eeprom_ch->flags,
395                         eeprom_ch->max_power_avg,
396                         ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS)
397                          && !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ?
398                         "" : "not ");
399
400         ch_info->fat_eeprom = *eeprom_ch;
401         ch_info->fat_max_power_avg = eeprom_ch->max_power_avg;
402         ch_info->fat_curr_txpow = eeprom_ch->max_power_avg;
403         ch_info->fat_min_power = 0;
404         ch_info->fat_scan_power = eeprom_ch->max_power_avg;
405         ch_info->fat_flags = eeprom_ch->flags;
406         ch_info->fat_extension_channel = fat_extension_channel;
407
408         return 0;
409 }
410
411 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
412                             ? # x " " : "")
413
414 /**
415  * iwl_init_channel_map - Set up driver's info for all possible channels
416  */
417 int iwl_init_channel_map(struct iwl_priv *priv)
418 {
419         int eeprom_ch_count = 0;
420         const u8 *eeprom_ch_index = NULL;
421         const struct iwl_eeprom_channel *eeprom_ch_info = NULL;
422         int band, ch;
423         struct iwl_channel_info *ch_info;
424
425         if (priv->channel_count) {
426                 IWL_DEBUG_INFO("Channel map already initialized.\n");
427                 return 0;
428         }
429
430         IWL_DEBUG_INFO("Initializing regulatory info from EEPROM\n");
431
432         priv->channel_count =
433             ARRAY_SIZE(iwl_eeprom_band_1) +
434             ARRAY_SIZE(iwl_eeprom_band_2) +
435             ARRAY_SIZE(iwl_eeprom_band_3) +
436             ARRAY_SIZE(iwl_eeprom_band_4) +
437             ARRAY_SIZE(iwl_eeprom_band_5);
438
439         IWL_DEBUG_INFO("Parsing data for %d channels.\n", priv->channel_count);
440
441         priv->channel_info = kzalloc(sizeof(struct iwl_channel_info) *
442                                      priv->channel_count, GFP_KERNEL);
443         if (!priv->channel_info) {
444                 IWL_ERROR("Could not allocate channel_info\n");
445                 priv->channel_count = 0;
446                 return -ENOMEM;
447         }
448
449         ch_info = priv->channel_info;
450
451         /* Loop through the 5 EEPROM bands adding them in order to the
452          * channel map we maintain (that contains additional information than
453          * what just in the EEPROM) */
454         for (band = 1; band <= 5; band++) {
455
456                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
457                                         &eeprom_ch_info, &eeprom_ch_index);
458
459                 /* Loop through each band adding each of the channels */
460                 for (ch = 0; ch < eeprom_ch_count; ch++) {
461                         ch_info->channel = eeprom_ch_index[ch];
462                         ch_info->band = (band == 1) ? IEEE80211_BAND_2GHZ :
463                             IEEE80211_BAND_5GHZ;
464
465                         /* permanently store EEPROM's channel regulatory flags
466                          *   and max power in channel info database. */
467                         ch_info->eeprom = eeprom_ch_info[ch];
468
469                         /* Copy the run-time flags so they are there even on
470                          * invalid channels */
471                         ch_info->flags = eeprom_ch_info[ch].flags;
472                         /* First write that fat is not enabled, and then enable
473                          * one by one */
474                         ch_info->fat_extension_channel =
475                                 (IEEE80211_CHAN_NO_FAT_ABOVE |
476                                  IEEE80211_CHAN_NO_FAT_BELOW);
477
478                         if (!(is_channel_valid(ch_info))) {
479                                 IWL_DEBUG_INFO("Ch. %d Flags %x [%sGHz] - "
480                                                "No traffic\n",
481                                                ch_info->channel,
482                                                ch_info->flags,
483                                                is_channel_a_band(ch_info) ?
484                                                "5.2" : "2.4");
485                                 ch_info++;
486                                 continue;
487                         }
488
489                         /* Initialize regulatory-based run-time data */
490                         ch_info->max_power_avg = ch_info->curr_txpow =
491                             eeprom_ch_info[ch].max_power_avg;
492                         ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
493                         ch_info->min_power = 0;
494
495                         IWL_DEBUG_INFO("Ch. %d [%sGHz] %s%s%s%s%s%s(0x%02x %ddBm):"
496                                        " Ad-Hoc %ssupported\n",
497                                        ch_info->channel,
498                                        is_channel_a_band(ch_info) ?
499                                        "5.2" : "2.4",
500                                        CHECK_AND_PRINT_I(VALID),
501                                        CHECK_AND_PRINT_I(IBSS),
502                                        CHECK_AND_PRINT_I(ACTIVE),
503                                        CHECK_AND_PRINT_I(RADAR),
504                                        CHECK_AND_PRINT_I(WIDE),
505                                        CHECK_AND_PRINT_I(DFS),
506                                        eeprom_ch_info[ch].flags,
507                                        eeprom_ch_info[ch].max_power_avg,
508                                        ((eeprom_ch_info[ch].
509                                          flags & EEPROM_CHANNEL_IBSS)
510                                         && !(eeprom_ch_info[ch].
511                                              flags & EEPROM_CHANNEL_RADAR))
512                                        ? "" : "not ");
513
514                         /* Set the user_txpower_limit to the highest power
515                          * supported by any channel */
516                         if (eeprom_ch_info[ch].max_power_avg >
517                                                 priv->tx_power_user_lmt)
518                                 priv->tx_power_user_lmt =
519                                     eeprom_ch_info[ch].max_power_avg;
520
521                         ch_info++;
522                 }
523         }
524
525         /* Two additional EEPROM bands for 2.4 and 5 GHz FAT channels */
526         for (band = 6; band <= 7; band++) {
527                 enum ieee80211_band ieeeband;
528                 u8 fat_extension_chan;
529
530                 iwl_init_band_reference(priv, band, &eeprom_ch_count,
531                                         &eeprom_ch_info, &eeprom_ch_index);
532
533                 /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
534                 ieeeband =
535                         (band == 6) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
536
537                 /* Loop through each band adding each of the channels */
538                 for (ch = 0; ch < eeprom_ch_count; ch++) {
539
540                         if ((band == 6) &&
541                                 ((eeprom_ch_index[ch] == 5) ||
542                                  (eeprom_ch_index[ch] == 6) ||
543                                  (eeprom_ch_index[ch] == 7)))
544                                 /* both are allowed: above and below */
545                                 fat_extension_chan = 0;
546                         else
547                                 fat_extension_chan =
548                                         IEEE80211_CHAN_NO_FAT_BELOW;
549
550                         /* Set up driver's info for lower half */
551                         iwl_set_fat_chan_info(priv, ieeeband,
552                                                 eeprom_ch_index[ch],
553                                                 &(eeprom_ch_info[ch]),
554                                                 fat_extension_chan);
555
556                         /* Set up driver's info for upper half */
557                         iwl_set_fat_chan_info(priv, ieeeband,
558                                                 (eeprom_ch_index[ch] + 4),
559                                                 &(eeprom_ch_info[ch]),
560                                                 IEEE80211_CHAN_NO_FAT_ABOVE);
561                 }
562         }
563
564         return 0;
565 }
566 EXPORT_SYMBOL(iwl_init_channel_map);
567
568 /*
569  * iwl_free_channel_map - undo allocations in iwl_init_channel_map
570  */
571 void iwl_free_channel_map(struct iwl_priv *priv)
572 {
573         kfree(priv->channel_info);
574         priv->channel_count = 0;
575 }
576
577 /**
578  * iwl_get_channel_info - Find driver's private channel info
579  *
580  * Based on band and channel number.
581  */
582 const struct iwl_channel_info *iwl_get_channel_info(const struct iwl_priv *priv,
583                                         enum ieee80211_band band, u16 channel)
584 {
585         int i;
586
587         switch (band) {
588         case IEEE80211_BAND_5GHZ:
589                 for (i = 14; i < priv->channel_count; i++) {
590                         if (priv->channel_info[i].channel == channel)
591                                 return &priv->channel_info[i];
592                 }
593                 break;
594         case IEEE80211_BAND_2GHZ:
595                 if (channel >= 1 && channel <= 14)
596                         return &priv->channel_info[channel - 1];
597                 break;
598         default:
599                 BUG();
600         }
601
602         return NULL;
603 }
604 EXPORT_SYMBOL(iwl_get_channel_info);
605