Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
/*
 * Intel Wireless Multicomm 3200 WiFi driver
 *
 * Copyright (C) 2009 Intel Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Intel Corporation <ilw@linux.intel.com>
 * Samuel Ortiz <samuel.ortiz@intel.com>
 * Zhu Yi <yi.zhu@intel.com>
 *
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/sched.h>
#include <linux/ieee80211.h>
#include <linux/wireless.h>

#include "iwm.h"
#include "debug.h"
#include "bus.h"
#include "umac.h"
#include "commands.h"
#include "hal.h"
#include "fw.h"
#include "rx.h"

static struct iwm_conf def_iwm_conf = {

	.sdio_ior_timeout	= 5000,
	.calib_map		= BIT(CALIB_CFG_DC_IDX)	|
				  BIT(CALIB_CFG_LO_IDX)	|
				  BIT(CALIB_CFG_TX_IQ_IDX)	|
				  BIT(CALIB_CFG_RX_IQ_IDX)	|
				  BIT(SHILOH_PHY_CALIBRATE_BASE_BAND_CMD),
	.expected_calib_map	= BIT(PHY_CALIBRATE_DC_CMD)	|
				  BIT(PHY_CALIBRATE_LO_CMD)	|
				  BIT(PHY_CALIBRATE_TX_IQ_CMD)	|
				  BIT(PHY_CALIBRATE_RX_IQ_CMD)	|
				  BIT(SHILOH_PHY_CALIBRATE_BASE_BAND_CMD),
	.reset_on_fatal_err	= 1,
	.auto_connect		= 1,
	.wimax_not_present	= 0,
	.enable_qos		= 1,
	.mode			= UMAC_MODE_BSS,

	/* UMAC configuration */
	.power_index		= 0,
	.frag_threshold		= IEEE80211_MAX_FRAG_THRESHOLD,
	.rts_threshold		= IEEE80211_MAX_RTS_THRESHOLD,
	.cts_to_self		= 0,

	.assoc_timeout		= 2,
	.roam_timeout		= 10,
	.wireless_mode		= WIRELESS_MODE_11A | WIRELESS_MODE_11G,
	.coexist_mode		= COEX_MODE_CM,

	/* IBSS */
	.ibss_band		= UMAC_BAND_2GHZ,
	.ibss_channel		= 1,

	.mac_addr		= {0x00, 0x02, 0xb3, 0x01, 0x02, 0x03},
};

static int modparam_reset;
module_param_named(reset, modparam_reset, bool, 0644);
MODULE_PARM_DESC(reset, "reset on firmware errors (default 0 [not reset])");

int iwm_mode_to_nl80211_iftype(int mode)
{
	switch (mode) {
	case UMAC_MODE_BSS:
		return NL80211_IFTYPE_STATION;
	case UMAC_MODE_IBSS:
		return NL80211_IFTYPE_ADHOC;
	default:
		return NL80211_IFTYPE_UNSPECIFIED;
	}

	return 0;
}

static void iwm_statistics_request(struct work_struct *work)
{
	struct iwm_priv *iwm =
		container_of(work, struct iwm_priv, stats_request.work);

	iwm_send_umac_stats_req(iwm, 0);
}

static void iwm_disconnect_work(struct work_struct *work)
{
	struct iwm_priv *iwm =
		container_of(work, struct iwm_priv, disconnect.work);

	if (iwm->umac_profile_active)
		iwm_invalidate_mlme_profile(iwm);

	clear_bit(IWM_STATUS_ASSOCIATED, &iwm->status);
	iwm->umac_profile_active = 0;
	memset(iwm->bssid, 0, ETH_ALEN);
	iwm->channel = 0;

	iwm_link_off(iwm);

	wake_up_interruptible(&iwm->mlme_queue);

	cfg80211_disconnected(iwm_to_ndev(iwm), 0, NULL, 0, GFP_KERNEL);
}

static int __iwm_up(struct iwm_priv *iwm);
static int __iwm_down(struct iwm_priv *iwm);

static void iwm_reset_worker(struct work_struct *work)
{
	struct iwm_priv *iwm;
	struct iwm_umac_profile *profile = NULL;
	int uninitialized_var(ret), retry = 0;

	iwm = container_of(work, struct iwm_priv, reset_worker);

	/*
	 * XXX: The iwm->mutex is introduced purely for this reset work,
	 * because the other users for iwm_up and iwm_down are only netdev
	 * ndo_open and ndo_stop which are already protected by rtnl.
	 * Please remove iwm->mutex together if iwm_reset_worker() is not
	 * required in the future.
	 */
	if (!mutex_trylock(&iwm->mutex)) {
		IWM_WARN(iwm, "We are in the middle of interface bringing "
			 "UP/DOWN. Skip driver resetting.\n");
		return;
	}

	if (iwm->umac_profile_active) {
		profile = kmalloc(sizeof(struct iwm_umac_profile), GFP_KERNEL);
		if (profile)
			memcpy(profile, iwm->umac_profile, sizeof(*profile));
		else
			IWM_ERR(iwm, "Couldn't alloc memory for profile\n");
	}

	__iwm_down(iwm);

	while (retry++ < 3) {
		ret = __iwm_up(iwm);
		if (!ret)
			break;

		schedule_timeout_uninterruptible(10 * HZ);
	}

	if (ret) {
		IWM_WARN(iwm, "iwm_up() failed: %d\n", ret);

		kfree(profile);
		goto out;
	}

	if (profile) {
		IWM_DBG_MLME(iwm, DBG, "Resend UMAC profile\n");
		memcpy(iwm->umac_profile, profile, sizeof(*profile));
		iwm_send_mlme_profile(iwm);
		kfree(profile);
	} else
		clear_bit(IWM_STATUS_RESETTING, &iwm->status);

 out:
	mutex_unlock(&iwm->mutex);
}

static void iwm_watchdog(unsigned long data)
{
	struct iwm_priv *iwm = (struct iwm_priv *)data;

	IWM_WARN(iwm, "Watchdog expired: UMAC stalls!\n");

	if (modparam_reset)
		iwm_resetting(iwm);
}

int iwm_priv_init(struct iwm_priv *iwm)
{
	int i;
	char name[32];

	iwm->status = 0;
	INIT_LIST_HEAD(&iwm->pending_notif);
	init_waitqueue_head(&iwm->notif_queue);
	init_waitqueue_head(&iwm->nonwifi_queue);
	init_waitqueue_head(&iwm->wifi_ntfy_queue);
	init_waitqueue_head(&iwm->mlme_queue);
	memcpy(&iwm->conf, &def_iwm_conf, sizeof(struct iwm_conf));
	spin_lock_init(&iwm->tx_credit.lock);
	INIT_LIST_HEAD(&iwm->wifi_pending_cmd);
	INIT_LIST_HEAD(&iwm->nonwifi_pending_cmd);
	iwm->wifi_seq_num = UMAC_WIFI_SEQ_NUM_BASE;
	iwm->nonwifi_seq_num = UMAC_NONWIFI_SEQ_NUM_BASE;
	spin_lock_init(&iwm->cmd_lock);
	iwm->scan_id = 1;
	INIT_DELAYED_WORK(&iwm->stats_request, iwm_statistics_request);
	INIT_DELAYED_WORK(&iwm->disconnect, iwm_disconnect_work);
	INIT_WORK(&iwm->reset_worker, iwm_reset_worker);
	INIT_LIST_HEAD(&iwm->bss_list);

	skb_queue_head_init(&iwm->rx_list);
	INIT_LIST_HEAD(&iwm->rx_tickets);
	for (i = 0; i < IWM_RX_ID_HASH; i++)
		INIT_LIST_HEAD(&iwm->rx_packets[i]);

	INIT_WORK(&iwm->rx_worker, iwm_rx_worker);

	iwm->rx_wq = create_singlethread_workqueue(KBUILD_MODNAME "_rx");
	if (!iwm->rx_wq)
		return -EAGAIN;

	for (i = 0; i < IWM_TX_QUEUES; i++) {
		INIT_WORK(&iwm->txq[i].worker, iwm_tx_worker);
		snprintf(name, 32, KBUILD_MODNAME "_tx_%d", i);
		iwm->txq[i].id = i;
		iwm->txq[i].wq = create_singlethread_workqueue(name);
		if (!iwm->txq[i].wq)
			return -EAGAIN;

		skb_queue_head_init(&iwm->txq[i].queue);
	}

	for (i = 0; i < IWM_NUM_KEYS; i++)
		memset(&iwm->keys[i], 0, sizeof(struct iwm_key));

	iwm->default_key = -1;

	init_timer(&iwm->watchdog);
	iwm->watchdog.function = iwm_watchdog;
	iwm->watchdog.data = (unsigned long)iwm;
	mutex_init(&iwm->mutex);

	iwm->last_fw_err = kzalloc(sizeof(struct iwm_fw_error_hdr),
				   GFP_KERNEL);
	if (iwm->last_fw_err == NULL)
		return -ENOMEM;

	return 0;
}

void iwm_priv_deinit(struct iwm_priv *iwm)
{
	int i;

	for (i = 0; i < IWM_TX_QUEUES; i++)
		destroy_workqueue(iwm->txq[i].wq);

	destroy_workqueue(iwm->rx_wq);
	kfree(iwm->last_fw_err);
}

/*
 * We reset all the structures, and we reset the UMAC.
 * After calling this routine, you're expected to reload
 * the firmware.
 */
void iwm_reset(struct iwm_priv *iwm)
{
	struct iwm_notif *notif, *next;

	if (test_bit(IWM_STATUS_READY, &iwm->status))
		iwm_target_reset(iwm);

	if (test_bit(IWM_STATUS_RESETTING, &iwm->status)) {
		iwm->status = 0;
		set_bit(IWM_STATUS_RESETTING, &iwm->status);
	} else
		iwm->status = 0;
	iwm->scan_id = 1;

	list_for_each_entry_safe(notif, next, &iwm->pending_notif, pending) {
		list_del(&notif->pending);
		kfree(notif->buf);
		kfree(notif);
	}

	iwm_cmd_flush(iwm);

	flush_workqueue(iwm->rx_wq);

	iwm_link_off(iwm);
}

void iwm_resetting(struct iwm_priv *iwm)
{
	set_bit(IWM_STATUS_RESETTING, &iwm->status);

	schedule_work(&iwm->reset_worker);
}

/*
 * Notification code:
 *
 * We're faced with the following issue: Any host command can
 * have an answer or not, and if there's an answer to expect,
 * it can be treated synchronously or asynchronously.
 * To work around the synchronous answer case, we implemented
 * our notification mechanism.
 * When a code path needs to wait for a command response
 * synchronously, it calls notif_handle(), which waits for the
 * right notification to show up, and then process it. Before
 * starting to wait, it registered as a waiter for this specific
 * answer (by toggling a bit in on of the handler_map), so that
 * the rx code knows that it needs to send a notification to the
 * waiting processes. It does so by calling iwm_notif_send(),
 * which adds the notification to the pending notifications list,
 * and then wakes the waiting processes up.
 */
int iwm_notif_send(struct iwm_priv *iwm, struct iwm_wifi_cmd *cmd,
		   u8 cmd_id, u8 source, u8 *buf, unsigned long buf_size)
{
	struct iwm_notif *notif;

	notif = kzalloc(sizeof(struct iwm_notif), GFP_KERNEL);
	if (!notif) {
		IWM_ERR(iwm, "Couldn't alloc memory for notification\n");
		return -ENOMEM;
	}

	INIT_LIST_HEAD(&notif->pending);
	notif->cmd = cmd;
	notif->cmd_id = cmd_id;
	notif->src = source;
	notif->buf = kzalloc(buf_size, GFP_KERNEL);
	if (!notif->buf) {
		IWM_ERR(iwm, "Couldn't alloc notification buffer\n");
		kfree(notif);
		return -ENOMEM;
	}
	notif->buf_size = buf_size;
	memcpy(notif->buf, buf, buf_size);
	list_add_tail(&notif->pending, &iwm->pending_notif);

	wake_up_interruptible(&iwm->notif_queue);

	return 0;
}

static struct iwm_notif *iwm_notif_find(struct iwm_priv *iwm, u32 cmd,
					u8 source)
{
	struct iwm_notif *notif, *next;

	list_for_each_entry_safe(notif, next, &iwm->pending_notif, pending) {
		if ((notif->cmd_id == cmd) && (notif->src == source)) {
			list_del(&notif->pending);
			return notif;
		}
	}

	return NULL;
}

static struct iwm_notif *iwm_notif_wait(struct iwm_priv *iwm, u32 cmd,
					u8 source, long timeout)
{
	int ret;
	struct iwm_notif *notif;
	unsigned long *map = NULL;

	switch (source) {
	case IWM_SRC_LMAC:
		map = &iwm->lmac_handler_map[0];
		break;
	case IWM_SRC_UMAC:
		map = &iwm->umac_handler_map[0];
		break;
	case IWM_SRC_UDMA:
		map = &iwm->udma_handler_map[0];
		break;
	}

	set_bit(cmd, map);

	ret = wait_event_interruptible_timeout(iwm->notif_queue,
			 ((notif = iwm_notif_find(iwm, cmd, source)) != NULL),
					       timeout);
	clear_bit(cmd, map);

	if (!ret)
		return NULL;

	return notif;
}

int iwm_notif_handle(struct iwm_priv *iwm, u32 cmd, u8 source, long timeout)
{
	int ret;
	struct iwm_notif *notif;

	notif = iwm_notif_wait(iwm, cmd, source, timeout);
	if (!notif)
		return -ETIME;

	ret = iwm_rx_handle_resp(iwm, notif->buf, notif->buf_size, notif->cmd);
	kfree(notif->buf);
	kfree(notif);

	return ret;
}

static int iwm_config_boot_params(struct iwm_priv *iwm)
{
	struct iwm_udma_nonwifi_cmd target_cmd;
	int ret;

	/* check Wimax is off and config debug monitor */
	if (iwm->conf.wimax_not_present) {
		u32 data1 = 0x1f;
		u32 addr1 = 0x606BE258;

		u32 data2_set = 0x0;
		u32 data2_clr = 0x1;
		u32 addr2 = 0x606BE100;

		u32 data3 = 0x1;
		u32 addr3 = 0x606BEC00;

		target_cmd.resp = 0;
		target_cmd.handle_by_hw = 0;
		target_cmd.eop = 1;

		target_cmd.opcode = UMAC_HDI_OUT_OPCODE_WRITE;
		target_cmd.addr = cpu_to_le32(addr1);
		target_cmd.op1_sz = cpu_to_le32(sizeof(u32));
		target_cmd.op2 = 0;

		ret = iwm_hal_send_target_cmd(iwm, &target_cmd, &data1);
		if (ret < 0) {
			IWM_ERR(iwm, "iwm_hal_send_target_cmd failed\n");
			return ret;
		}

		target_cmd.opcode = UMAC_HDI_OUT_OPCODE_READ_MODIFY_WRITE;
		target_cmd.addr = cpu_to_le32(addr2);
		target_cmd.op1_sz = cpu_to_le32(data2_set);
		target_cmd.op2 = cpu_to_le32(data2_clr);

		ret = iwm_hal_send_target_cmd(iwm, &target_cmd, &data1);
		if (ret < 0) {
			IWM_ERR(iwm, "iwm_hal_send_target_cmd failed\n");
			return ret;
		}

		target_cmd.opcode = UMAC_HDI_OUT_OPCODE_WRITE;
		target_cmd.addr = cpu_to_le32(addr3);
		target_cmd.op1_sz = cpu_to_le32(sizeof(u32));
		target_cmd.op2 = 0;

		ret = iwm_hal_send_target_cmd(iwm, &target_cmd, &data3);
		if (ret < 0) {
			IWM_ERR(iwm, "iwm_hal_send_target_cmd failed\n");
			return ret;
		}
	}

	return 0;
}

void iwm_init_default_profile(struct iwm_priv *iwm,
			      struct iwm_umac_profile *profile)
{
	memset(profile, 0, sizeof(struct iwm_umac_profile));

	profile->sec.auth_type = UMAC_AUTH_TYPE_OPEN;
	profile->sec.flags = UMAC_SEC_FLG_LEGACY_PROFILE;
	profile->sec.ucast_cipher = UMAC_CIPHER_TYPE_NONE;
	profile->sec.mcast_cipher = UMAC_CIPHER_TYPE_NONE;

	if (iwm->conf.enable_qos)
		profile->flags |= cpu_to_le16(UMAC_PROFILE_QOS_ALLOWED);

	profile->wireless_mode = iwm->conf.wireless_mode;
	profile->mode = cpu_to_le32(iwm->conf.mode);

	profile->ibss.atim = 0;
	profile->ibss.beacon_interval = 100;
	profile->ibss.join_only = 0;
	profile->ibss.band = iwm->conf.ibss_band;
	profile->ibss.channel = iwm->conf.ibss_channel;
}

void iwm_link_on(struct iwm_priv *iwm)
{
	netif_carrier_on(iwm_to_ndev(iwm));
	netif_tx_wake_all_queues(iwm_to_ndev(iwm));

	iwm_send_umac_stats_req(iwm, 0);
}

void iwm_link_off(struct iwm_priv *iwm)
{
	struct iw_statistics *wstats = &iwm->wstats;
	int i;

	netif_tx_stop_all_queues(iwm_to_ndev(iwm));
	netif_carrier_off(iwm_to_ndev(iwm));

	for (i = 0; i < IWM_TX_QUEUES; i++) {
		skb_queue_purge(&iwm->txq[i].queue);

		iwm->txq[i].concat_count = 0;
		iwm->txq[i].concat_ptr = iwm->txq[i].concat_buf;

		flush_workqueue(iwm->txq[i].wq);
	}

	iwm_rx_free(iwm);

	cancel_delayed_work_sync(&iwm->stats_request);
	memset(wstats, 0, sizeof(struct iw_statistics));
	wstats->qual.updated = IW_QUAL_ALL_INVALID;

	kfree(iwm->req_ie);
	iwm->req_ie = NULL;
	iwm->req_ie_len = 0;
	kfree(iwm->resp_ie);
	iwm->resp_ie = NULL;
	iwm->resp_ie_len = 0;

	del_timer_sync(&iwm->watchdog);
}

static void iwm_bss_list_clean(struct iwm_priv *iwm)
{
	struct iwm_bss_info *bss, *next;

	list_for_each_entry_safe(bss, next, &iwm->bss_list, node) {
		list_del(&bss->node);
		kfree(bss->bss);
		kfree(bss);
	}
}

static int iwm_channels_init(struct iwm_priv *iwm)
{
	int ret;

	ret = iwm_send_umac_channel_list(iwm);
	if (ret) {
		IWM_ERR(iwm, "Send channel list failed\n");
		return ret;
	}

	ret = iwm_notif_handle(iwm, UMAC_CMD_OPCODE_GET_CHAN_INFO_LIST,
			       IWM_SRC_UMAC, WAIT_NOTIF_TIMEOUT);
	if (ret) {
		IWM_ERR(iwm, "Didn't get a channel list notification\n");
		return ret;
	}

	return 0;
}

static int __iwm_up(struct iwm_priv *iwm)
{
	int ret;
	struct iwm_notif *notif_reboot, *notif_ack = NULL;

	ret = iwm_bus_enable(iwm);
	if (ret) {
		IWM_ERR(iwm, "Couldn't enable function\n");
		return ret;
	}

	iwm_rx_setup_handlers(iwm);

	/* Wait for initial BARKER_REBOOT from hardware */
	notif_reboot = iwm_notif_wait(iwm, IWM_BARKER_REBOOT_NOTIFICATION,
				      IWM_SRC_UDMA, 2 * HZ);
	if (!notif_reboot) {
		IWM_ERR(iwm, "Wait for REBOOT_BARKER timeout\n");
		goto err_disable;
	}

	/* We send the barker back */
	ret = iwm_bus_send_chunk(iwm, notif_reboot->buf, 16);
	if (ret) {
		IWM_ERR(iwm, "REBOOT barker response failed\n");
		kfree(notif_reboot);
		goto err_disable;
	}

	kfree(notif_reboot->buf);
	kfree(notif_reboot);

	/* Wait for ACK_BARKER from hardware */
	notif_ack = iwm_notif_wait(iwm, IWM_ACK_BARKER_NOTIFICATION,
				   IWM_SRC_UDMA, 2 * HZ);
	if (!notif_ack) {
		IWM_ERR(iwm, "Wait for ACK_BARKER timeout\n");
		goto err_disable;
	}

	kfree(notif_ack->buf);
	kfree(notif_ack);

	/* We start to config static boot parameters */
	ret = iwm_config_boot_params(iwm);
	if (ret) {
		IWM_ERR(iwm, "Config boot parameters failed\n");
		goto err_disable;
	}

	ret = iwm_read_mac(iwm, iwm_to_ndev(iwm)->dev_addr);
	if (ret) {
		IWM_ERR(iwm, "MAC reading failed\n");
		goto err_disable;
	}

	/* We can load the FWs */
	ret = iwm_load_fw(iwm);
	if (ret) {
		IWM_ERR(iwm, "FW loading failed\n");
		goto err_disable;
	}

	/* We configure the UMAC and enable the wifi module */
	ret = iwm_send_umac_config(iwm,
			cpu_to_le32(UMAC_RST_CTRL_FLG_WIFI_CORE_EN) |
			cpu_to_le32(UMAC_RST_CTRL_FLG_WIFI_LINK_EN) |
			cpu_to_le32(UMAC_RST_CTRL_FLG_WIFI_MLME_EN));
	if (ret) {
		IWM_ERR(iwm, "UMAC config failed\n");
		goto err_fw;
	}

	ret = iwm_notif_handle(iwm, UMAC_NOTIFY_OPCODE_WIFI_CORE_STATUS,
			       IWM_SRC_UMAC, WAIT_NOTIF_TIMEOUT);
	if (ret) {
		IWM_ERR(iwm, "Didn't get a wifi core status notification\n");
		goto err_fw;
	}

	if (iwm->core_enabled != (UMAC_NTFY_WIFI_CORE_STATUS_LINK_EN |
				  UMAC_NTFY_WIFI_CORE_STATUS_MLME_EN)) {
		IWM_DBG_BOOT(iwm, DBG, "Not all cores enabled:0x%x\n",
			     iwm->core_enabled);
		ret = iwm_notif_handle(iwm, UMAC_NOTIFY_OPCODE_WIFI_CORE_STATUS,
			       IWM_SRC_UMAC, WAIT_NOTIF_TIMEOUT);
		if (ret) {
			IWM_ERR(iwm, "Didn't get a core status notification\n");
			goto err_fw;
		}

		if (iwm->core_enabled != (UMAC_NTFY_WIFI_CORE_STATUS_LINK_EN |
					  UMAC_NTFY_WIFI_CORE_STATUS_MLME_EN)) {
			IWM_ERR(iwm, "Not all cores enabled: 0x%x\n",
				iwm->core_enabled);
			goto err_fw;
		} else {
			IWM_INFO(iwm, "All cores enabled\n");
		}
	}

	ret = iwm_channels_init(iwm);
	if (ret < 0) {
		IWM_ERR(iwm, "Couldn't init channels\n");
		goto err_fw;
	}

	/* Set the READY bit to indicate interface is brought up successfully */
	set_bit(IWM_STATUS_READY, &iwm->status);

	return 0;

 err_fw:
	iwm_eeprom_exit(iwm);

 err_disable:
	ret = iwm_bus_disable(iwm);
	if (ret < 0)
		IWM_ERR(iwm, "Couldn't disable function\n");

	return -EIO;
}

int iwm_up(struct iwm_priv *iwm)
{
	int ret;

	mutex_lock(&iwm->mutex);
	ret = __iwm_up(iwm);
	mutex_unlock(&iwm->mutex);

	return ret;
}

static int __iwm_down(struct iwm_priv *iwm)
{
	int ret;

	/* The interface is already down */
	if (!test_bit(IWM_STATUS_READY, &iwm->status))
		return 0;

	if (iwm->scan_request) {
		cfg80211_scan_done(iwm->scan_request, true);
		iwm->scan_request = NULL;
	}

	clear_bit(IWM_STATUS_READY, &iwm->status);

	iwm_eeprom_exit(iwm);
	iwm_bss_list_clean(iwm);
	iwm_init_default_profile(iwm, iwm->umac_profile);
	iwm->umac_profile_active = false;
	iwm->default_key = -1;
	iwm->core_enabled = 0;

	ret = iwm_bus_disable(iwm);
	if (ret < 0) {
		IWM_ERR(iwm, "Couldn't disable function\n");
		return ret;
	}

	return 0;
}

int iwm_down(struct iwm_priv *iwm)
{
	int ret;

	mutex_lock(&iwm->mutex);
	ret = __iwm_down(iwm);
	mutex_unlock(&iwm->mutex);

	return ret;
}