1 /*
2  * Marvell Wireless LAN device driver: HW/FW Initialization
3  *
4  * Copyright (C) 2011-2014, Marvell International Ltd.
5  *
6  * This software file (the "File") is distributed by Marvell International
7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8  * (the "License").  You may use, redistribute and/or modify this File in
9  * accordance with the terms and conditions of the License, a copy of which
10  * is available by writing to the Free Software Foundation, Inc.,
11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13  *
14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
17  * this warranty disclaimer.
18  */
19 
20 #include "decl.h"
21 #include "ioctl.h"
22 #include "util.h"
23 #include "fw.h"
24 #include "main.h"
25 #include "wmm.h"
26 #include "11n.h"
27 
28 /*
29  * This function adds a BSS priority table to the table list.
30  *
31  * The function allocates a new BSS priority table node and adds it to
32  * the end of BSS priority table list, kept in driver memory.
33  */
34 static int mwifiex_add_bss_prio_tbl(struct mwifiex_private *priv)
35 {
36 	struct mwifiex_adapter *adapter = priv->adapter;
37 	struct mwifiex_bss_prio_node *bss_prio;
38 	struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
39 	unsigned long flags;
40 
41 	bss_prio = kzalloc(sizeof(struct mwifiex_bss_prio_node), GFP_KERNEL);
42 	if (!bss_prio)
43 		return -ENOMEM;
44 
45 	bss_prio->priv = priv;
46 	INIT_LIST_HEAD(&bss_prio->list);
47 
48 	spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
49 	list_add_tail(&bss_prio->list, &tbl[priv->bss_priority].bss_prio_head);
50 	spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
51 
52 	return 0;
53 }
54 
55 static void wakeup_timer_fn(unsigned long data)
56 {
57 	struct mwifiex_adapter *adapter = (struct mwifiex_adapter *)data;
58 
59 	mwifiex_dbg(adapter, ERROR, "Firmware wakeup failed\n");
60 	adapter->hw_status = MWIFIEX_HW_STATUS_RESET;
61 	mwifiex_cancel_all_pending_cmd(adapter);
62 
63 	if (adapter->if_ops.card_reset)
64 		adapter->if_ops.card_reset(adapter);
65 }
66 
67 /*
68  * This function initializes the private structure and sets default
69  * values to the members.
70  *
71  * Additionally, it also initializes all the locks and sets up all the
72  * lists.
73  */
74 int mwifiex_init_priv(struct mwifiex_private *priv)
75 {
76 	u32 i;
77 
78 	priv->media_connected = false;
79 	eth_broadcast_addr(priv->curr_addr);
80 	priv->port_open = false;
81 	priv->usb_port = MWIFIEX_USB_EP_DATA;
82 	priv->pkt_tx_ctrl = 0;
83 	priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
84 	priv->data_rate = 0;	/* Initially indicate the rate as auto */
85 	priv->is_data_rate_auto = true;
86 	priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
87 	priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;
88 
89 	priv->sec_info.wep_enabled = 0;
90 	priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
91 	priv->sec_info.encryption_mode = 0;
92 	for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
93 		memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
94 	priv->wep_key_curr_index = 0;
95 	priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
96 				HostCmd_ACT_MAC_ETHERNETII_ENABLE;
97 
98 	priv->beacon_period = 100; /* beacon interval */
99 	priv->attempted_bss_desc = NULL;
100 	memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
101 	priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;
102 
103 	memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
104 	memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
105 	memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
106 	priv->assoc_rsp_size = 0;
107 	priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
108 	priv->atim_window = 0;
109 	priv->adhoc_state = ADHOC_IDLE;
110 	priv->tx_power_level = 0;
111 	priv->max_tx_power_level = 0;
112 	priv->min_tx_power_level = 0;
113 	priv->tx_rate = 0;
114 	priv->rxpd_htinfo = 0;
115 	priv->rxpd_rate = 0;
116 	priv->rate_bitmap = 0;
117 	priv->data_rssi_last = 0;
118 	priv->data_rssi_avg = 0;
119 	priv->data_nf_avg = 0;
120 	priv->data_nf_last = 0;
121 	priv->bcn_rssi_last = 0;
122 	priv->bcn_rssi_avg = 0;
123 	priv->bcn_nf_avg = 0;
124 	priv->bcn_nf_last = 0;
125 	memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
126 	memset(&priv->aes_key, 0, sizeof(priv->aes_key));
127 	priv->wpa_ie_len = 0;
128 	priv->wpa_is_gtk_set = false;
129 
130 	memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
131 	priv->assoc_tlv_buf_len = 0;
132 	memset(&priv->wps, 0, sizeof(priv->wps));
133 	memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
134 	priv->gen_ie_buf_len = 0;
135 	memset(priv->vs_ie, 0, sizeof(priv->vs_ie));
136 
137 	priv->wmm_required = true;
138 	priv->wmm_enabled = false;
139 	priv->wmm_qosinfo = 0;
140 	priv->curr_bcn_buf = NULL;
141 	priv->curr_bcn_size = 0;
142 	priv->wps_ie = NULL;
143 	priv->wps_ie_len = 0;
144 	priv->ap_11n_enabled = 0;
145 	memset(&priv->roc_cfg, 0, sizeof(priv->roc_cfg));
146 
147 	priv->scan_block = false;
148 
149 	priv->csa_chan = 0;
150 	priv->csa_expire_time = 0;
151 	priv->del_list_idx = 0;
152 	priv->hs2_enabled = false;
153 	priv->check_tdls_tx = false;
154 	memcpy(priv->tos_to_tid_inv, tos_to_tid_inv, MAX_NUM_TID);
155 
156 	mwifiex_init_11h_params(priv);
157 
158 	return mwifiex_add_bss_prio_tbl(priv);
159 }
160 
161 /*
162  * This function allocates buffers for members of the adapter
163  * structure.
164  *
165  * The memory allocated includes scan table, command buffers, and
166  * sleep confirm command buffer. In addition, the queues are
167  * also initialized.
168  */
169 static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
170 {
171 	int ret;
172 
173 	/* Allocate command buffer */
174 	ret = mwifiex_alloc_cmd_buffer(adapter);
175 	if (ret) {
176 		mwifiex_dbg(adapter, ERROR,
177 			    "%s: failed to alloc cmd buffer\n",
178 			    __func__);
179 		return -1;
180 	}
181 
182 	adapter->sleep_cfm =
183 		dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
184 			      + INTF_HEADER_LEN);
185 
186 	if (!adapter->sleep_cfm) {
187 		mwifiex_dbg(adapter, ERROR,
188 			    "%s: failed to alloc sleep cfm\t"
189 			    " cmd buffer\n", __func__);
190 		return -1;
191 	}
192 	skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
193 
194 	return 0;
195 }
196 
197 /*
198  * This function initializes the adapter structure and sets default
199  * values to the members of adapter.
200  *
201  * This also initializes the WMM related parameters in the driver private
202  * structures.
203  */
204 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
205 {
206 	struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
207 
208 	skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
209 
210 	adapter->cmd_sent = false;
211 
212 	if (adapter->iface_type == MWIFIEX_SDIO)
213 		adapter->data_sent = true;
214 	else
215 		adapter->data_sent = false;
216 
217 	adapter->cmd_resp_received = false;
218 	adapter->event_received = false;
219 	adapter->data_received = false;
220 
221 	adapter->surprise_removed = false;
222 
223 	adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
224 
225 	adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
226 	adapter->ps_state = PS_STATE_AWAKE;
227 	adapter->need_to_wakeup = false;
228 
229 	adapter->scan_mode = HostCmd_BSS_MODE_ANY;
230 	adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
231 	adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
232 	adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
233 	adapter->scan_chan_gap_time = MWIFIEX_DEF_SCAN_CHAN_GAP_TIME;
234 
235 	adapter->scan_probes = 1;
236 
237 	adapter->multiple_dtim = 1;
238 
239 	adapter->local_listen_interval = 0;	/* default value in firmware
240 						   will be used */
241 
242 	adapter->is_deep_sleep = false;
243 
244 	adapter->delay_null_pkt = false;
245 	adapter->delay_to_ps = 1000;
246 	adapter->enhanced_ps_mode = PS_MODE_AUTO;
247 
248 	adapter->gen_null_pkt = false;	/* Disable NULL Pkg generation by
249 					   default */
250 	adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
251 					   default */
252 	adapter->pm_wakeup_card_req = false;
253 
254 	adapter->pm_wakeup_fw_try = false;
255 
256 	adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
257 
258 	adapter->is_hs_configured = false;
259 	adapter->hs_cfg.conditions = cpu_to_le32(HS_CFG_COND_DEF);
260 	adapter->hs_cfg.gpio = HS_CFG_GPIO_DEF;
261 	adapter->hs_cfg.gap = HS_CFG_GAP_DEF;
262 	adapter->hs_activated = false;
263 
264 	memset(adapter->event_body, 0, sizeof(adapter->event_body));
265 	adapter->hw_dot_11n_dev_cap = 0;
266 	adapter->hw_dev_mcs_support = 0;
267 	adapter->sec_chan_offset = 0;
268 	adapter->adhoc_11n_enabled = false;
269 
270 	mwifiex_wmm_init(adapter);
271 
272 	sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
273 					adapter->sleep_cfm->data;
274 	memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
275 	sleep_cfm_buf->command = cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
276 	sleep_cfm_buf->size = cpu_to_le16(adapter->sleep_cfm->len);
277 	sleep_cfm_buf->result = 0;
278 	sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
279 	sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
280 
281 	memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
282 	memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
283 	adapter->tx_lock_flag = false;
284 	adapter->null_pkt_interval = 0;
285 	adapter->fw_bands = 0;
286 	adapter->config_bands = 0;
287 	adapter->adhoc_start_band = 0;
288 	adapter->scan_channels = NULL;
289 	adapter->fw_release_number = 0;
290 	adapter->fw_cap_info = 0;
291 	memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
292 	adapter->event_cause = 0;
293 	adapter->region_code = 0;
294 	adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
295 	adapter->adhoc_awake_period = 0;
296 	memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
297 	adapter->arp_filter_size = 0;
298 	adapter->max_mgmt_ie_index = MAX_MGMT_IE_INDEX;
299 	adapter->key_api_major_ver = 0;
300 	adapter->key_api_minor_ver = 0;
301 	eth_broadcast_addr(adapter->perm_addr);
302 	adapter->iface_limit.sta_intf = MWIFIEX_MAX_STA_NUM;
303 	adapter->iface_limit.uap_intf = MWIFIEX_MAX_UAP_NUM;
304 	adapter->iface_limit.p2p_intf = MWIFIEX_MAX_P2P_NUM;
305 	adapter->active_scan_triggered = false;
306 	setup_timer(&adapter->wakeup_timer, wakeup_timer_fn,
307 		    (unsigned long)adapter);
308 }
309 
310 /*
311  * This function sets trans_start per tx_queue
312  */
313 void mwifiex_set_trans_start(struct net_device *dev)
314 {
315 	int i;
316 
317 	for (i = 0; i < dev->num_tx_queues; i++)
318 		netdev_get_tx_queue(dev, i)->trans_start = jiffies;
319 
320 	netif_trans_update(dev);
321 }
322 
323 /*
324  * This function wakes up all queues in net_device
325  */
326 void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
327 					struct mwifiex_adapter *adapter)
328 {
329 	unsigned long dev_queue_flags;
330 	unsigned int i;
331 
332 	spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
333 
334 	for (i = 0; i < netdev->num_tx_queues; i++) {
335 		struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
336 
337 		if (netif_tx_queue_stopped(txq))
338 			netif_tx_wake_queue(txq);
339 	}
340 
341 	spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
342 }
343 
344 /*
345  * This function stops all queues in net_device
346  */
347 void mwifiex_stop_net_dev_queue(struct net_device *netdev,
348 					struct mwifiex_adapter *adapter)
349 {
350 	unsigned long dev_queue_flags;
351 	unsigned int i;
352 
353 	spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
354 
355 	for (i = 0; i < netdev->num_tx_queues; i++) {
356 		struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
357 
358 		if (!netif_tx_queue_stopped(txq))
359 			netif_tx_stop_queue(txq);
360 	}
361 
362 	spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
363 }
364 
365 /*
366  *  This function releases the lock variables and frees the locks and
367  *  associated locks.
368  */
369 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
370 {
371 	struct mwifiex_private *priv;
372 	s32 i, j;
373 
374 	/* Free lists */
375 	list_del(&adapter->cmd_free_q);
376 	list_del(&adapter->cmd_pending_q);
377 	list_del(&adapter->scan_pending_q);
378 
379 	for (i = 0; i < adapter->priv_num; i++)
380 		list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
381 
382 	for (i = 0; i < adapter->priv_num; i++) {
383 		if (adapter->priv[i]) {
384 			priv = adapter->priv[i];
385 			for (j = 0; j < MAX_NUM_TID; ++j)
386 				list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
387 			list_del(&priv->tx_ba_stream_tbl_ptr);
388 			list_del(&priv->rx_reorder_tbl_ptr);
389 			list_del(&priv->sta_list);
390 			list_del(&priv->auto_tdls_list);
391 		}
392 	}
393 }
394 
395 /*
396  * This function performs cleanup for adapter structure.
397  *
398  * The cleanup is done recursively, by canceling all pending
399  * commands, freeing the member buffers previously allocated
400  * (command buffers, scan table buffer, sleep confirm command
401  * buffer), stopping the timers and calling the cleanup routines
402  * for every interface.
403  */
404 static void
405 mwifiex_adapter_cleanup(struct mwifiex_adapter *adapter)
406 {
407 	int idx;
408 
409 	if (!adapter) {
410 		pr_err("%s: adapter is NULL\n", __func__);
411 		return;
412 	}
413 
414 	del_timer(&adapter->wakeup_timer);
415 	mwifiex_cancel_all_pending_cmd(adapter);
416 	wake_up_interruptible(&adapter->cmd_wait_q.wait);
417 	wake_up_interruptible(&adapter->hs_activate_wait_q);
418 
419 	/* Free lock variables */
420 	mwifiex_free_lock_list(adapter);
421 
422 	/* Free command buffer */
423 	mwifiex_dbg(adapter, INFO, "info: free cmd buffer\n");
424 	mwifiex_free_cmd_buffer(adapter);
425 
426 	for (idx = 0; idx < adapter->num_mem_types; idx++) {
427 		struct memory_type_mapping *entry =
428 				&adapter->mem_type_mapping_tbl[idx];
429 
430 		if (entry->mem_ptr) {
431 			vfree(entry->mem_ptr);
432 			entry->mem_ptr = NULL;
433 		}
434 		entry->mem_size = 0;
435 	}
436 
437 	if (adapter->drv_info_dump) {
438 		vfree(adapter->drv_info_dump);
439 		adapter->drv_info_dump = NULL;
440 		adapter->drv_info_size = 0;
441 	}
442 
443 	if (adapter->sleep_cfm)
444 		dev_kfree_skb_any(adapter->sleep_cfm);
445 }
446 
447 /*
448  *  This function intializes the lock variables and
449  *  the list heads.
450  */
451 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
452 {
453 	struct mwifiex_private *priv;
454 	s32 i, j;
455 
456 	spin_lock_init(&adapter->mwifiex_lock);
457 	spin_lock_init(&adapter->int_lock);
458 	spin_lock_init(&adapter->main_proc_lock);
459 	spin_lock_init(&adapter->mwifiex_cmd_lock);
460 	spin_lock_init(&adapter->queue_lock);
461 	for (i = 0; i < adapter->priv_num; i++) {
462 		if (adapter->priv[i]) {
463 			priv = adapter->priv[i];
464 			spin_lock_init(&priv->rx_pkt_lock);
465 			spin_lock_init(&priv->wmm.ra_list_spinlock);
466 			spin_lock_init(&priv->curr_bcn_buf_lock);
467 			spin_lock_init(&priv->sta_list_spinlock);
468 			spin_lock_init(&priv->auto_tdls_lock);
469 		}
470 	}
471 
472 	/* Initialize cmd_free_q */
473 	INIT_LIST_HEAD(&adapter->cmd_free_q);
474 	/* Initialize cmd_pending_q */
475 	INIT_LIST_HEAD(&adapter->cmd_pending_q);
476 	/* Initialize scan_pending_q */
477 	INIT_LIST_HEAD(&adapter->scan_pending_q);
478 
479 	spin_lock_init(&adapter->cmd_free_q_lock);
480 	spin_lock_init(&adapter->cmd_pending_q_lock);
481 	spin_lock_init(&adapter->scan_pending_q_lock);
482 	spin_lock_init(&adapter->rx_proc_lock);
483 
484 	skb_queue_head_init(&adapter->rx_data_q);
485 	skb_queue_head_init(&adapter->tx_data_q);
486 
487 	for (i = 0; i < adapter->priv_num; ++i) {
488 		INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
489 		spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
490 	}
491 
492 	for (i = 0; i < adapter->priv_num; i++) {
493 		if (!adapter->priv[i])
494 			continue;
495 		priv = adapter->priv[i];
496 		for (j = 0; j < MAX_NUM_TID; ++j)
497 			INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
498 		INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
499 		INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
500 		INIT_LIST_HEAD(&priv->sta_list);
501 		INIT_LIST_HEAD(&priv->auto_tdls_list);
502 		skb_queue_head_init(&priv->tdls_txq);
503 		skb_queue_head_init(&priv->bypass_txq);
504 
505 		spin_lock_init(&priv->tx_ba_stream_tbl_lock);
506 		spin_lock_init(&priv->rx_reorder_tbl_lock);
507 
508 		spin_lock_init(&priv->ack_status_lock);
509 		idr_init(&priv->ack_status_frames);
510 	}
511 
512 	return 0;
513 }
514 
515 /*
516  * This function initializes the firmware.
517  *
518  * The following operations are performed sequentially -
519  *      - Allocate adapter structure
520  *      - Initialize the adapter structure
521  *      - Initialize the private structure
522  *      - Add BSS priority tables to the adapter structure
523  *      - For each interface, send the init commands to firmware
524  *      - Send the first command in command pending queue, if available
525  */
526 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
527 {
528 	int ret;
529 	struct mwifiex_private *priv;
530 	u8 i, first_sta = true;
531 	int is_cmd_pend_q_empty;
532 	unsigned long flags;
533 
534 	adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
535 
536 	/* Allocate memory for member of adapter structure */
537 	ret = mwifiex_allocate_adapter(adapter);
538 	if (ret)
539 		return -1;
540 
541 	/* Initialize adapter structure */
542 	mwifiex_init_adapter(adapter);
543 
544 	for (i = 0; i < adapter->priv_num; i++) {
545 		if (adapter->priv[i]) {
546 			priv = adapter->priv[i];
547 
548 			/* Initialize private structure */
549 			ret = mwifiex_init_priv(priv);
550 			if (ret)
551 				return -1;
552 		}
553 	}
554 
555 	for (i = 0; i < adapter->priv_num; i++) {
556 		if (adapter->priv[i]) {
557 			ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta,
558 						   true);
559 			if (ret == -1)
560 				return -1;
561 
562 			first_sta = false;
563 		}
564 	}
565 
566 	spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
567 	is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
568 	spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
569 	if (!is_cmd_pend_q_empty) {
570 		/* Send the first command in queue and return */
571 		if (mwifiex_main_process(adapter) != -1)
572 			ret = -EINPROGRESS;
573 	} else {
574 		adapter->hw_status = MWIFIEX_HW_STATUS_READY;
575 	}
576 
577 	return ret;
578 }
579 
580 /*
581  * This function deletes the BSS priority tables.
582  *
583  * The function traverses through all the allocated BSS priority nodes
584  * in every BSS priority table and frees them.
585  */
586 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
587 {
588 	int i;
589 	struct mwifiex_adapter *adapter = priv->adapter;
590 	struct mwifiex_bss_prio_node *bssprio_node, *tmp_node;
591 	struct list_head *head;
592 	spinlock_t *lock; /* bss priority lock */
593 	unsigned long flags;
594 
595 	for (i = 0; i < adapter->priv_num; ++i) {
596 		head = &adapter->bss_prio_tbl[i].bss_prio_head;
597 		lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
598 		mwifiex_dbg(adapter, INFO,
599 			    "info: delete BSS priority table,\t"
600 			    "bss_type = %d, bss_num = %d, i = %d,\t"
601 			    "head = %p\n",
602 			    priv->bss_type, priv->bss_num, i, head);
603 
604 		{
605 			spin_lock_irqsave(lock, flags);
606 			if (list_empty(head)) {
607 				spin_unlock_irqrestore(lock, flags);
608 				continue;
609 			}
610 			list_for_each_entry_safe(bssprio_node, tmp_node, head,
611 						 list) {
612 				if (bssprio_node->priv == priv) {
613 					mwifiex_dbg(adapter, INFO,
614 						    "info: Delete\t"
615 						    "node %p, next = %p\n",
616 						    bssprio_node, tmp_node);
617 					list_del(&bssprio_node->list);
618 					kfree(bssprio_node);
619 				}
620 			}
621 			spin_unlock_irqrestore(lock, flags);
622 		}
623 	}
624 }
625 
626 /*
627  * This function frees the private structure, including cleans
628  * up the TX and RX queues and frees the BSS priority tables.
629  */
630 void mwifiex_free_priv(struct mwifiex_private *priv)
631 {
632 	mwifiex_clean_txrx(priv);
633 	mwifiex_delete_bss_prio_tbl(priv);
634 	mwifiex_free_curr_bcn(priv);
635 }
636 
637 /*
638  * This function is used to shutdown the driver.
639  *
640  * The following operations are performed sequentially -
641  *      - Check if already shut down
642  *      - Make sure the main process has stopped
643  *      - Clean up the Tx and Rx queues
644  *      - Delete BSS priority tables
645  *      - Free the adapter
646  *      - Notify completion
647  */
648 int
649 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
650 {
651 	int ret = -EINPROGRESS;
652 	struct mwifiex_private *priv;
653 	s32 i;
654 	unsigned long flags;
655 	struct sk_buff *skb;
656 
657 	/* mwifiex already shutdown */
658 	if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
659 		return 0;
660 
661 	adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
662 	/* wait for mwifiex_process to complete */
663 	if (adapter->mwifiex_processing) {
664 		mwifiex_dbg(adapter, WARN,
665 			    "main process is still running\n");
666 		return ret;
667 	}
668 
669 	/* cancel current command */
670 	if (adapter->curr_cmd) {
671 		mwifiex_dbg(adapter, WARN,
672 			    "curr_cmd is still in processing\n");
673 		del_timer_sync(&adapter->cmd_timer);
674 		mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
675 		adapter->curr_cmd = NULL;
676 	}
677 
678 	/* shut down mwifiex */
679 	mwifiex_dbg(adapter, MSG,
680 		    "info: shutdown mwifiex...\n");
681 
682 	/* Clean up Tx/Rx queues and delete BSS priority table */
683 	for (i = 0; i < adapter->priv_num; i++) {
684 		if (adapter->priv[i]) {
685 			priv = adapter->priv[i];
686 
687 			mwifiex_clean_auto_tdls(priv);
688 			mwifiex_abort_cac(priv);
689 			mwifiex_clean_txrx(priv);
690 			mwifiex_delete_bss_prio_tbl(priv);
691 		}
692 	}
693 
694 	atomic_set(&adapter->tx_queued, 0);
695 	while ((skb = skb_dequeue(&adapter->tx_data_q)))
696 		mwifiex_write_data_complete(adapter, skb, 0, 0);
697 
698 	spin_lock_irqsave(&adapter->rx_proc_lock, flags);
699 
700 	while ((skb = skb_dequeue(&adapter->rx_data_q))) {
701 		struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
702 
703 		atomic_dec(&adapter->rx_pending);
704 		priv = adapter->priv[rx_info->bss_num];
705 		if (priv)
706 			priv->stats.rx_dropped++;
707 
708 		dev_kfree_skb_any(skb);
709 	}
710 
711 	spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
712 
713 	spin_lock(&adapter->mwifiex_lock);
714 
715 	mwifiex_adapter_cleanup(adapter);
716 
717 	spin_unlock(&adapter->mwifiex_lock);
718 
719 	/* Notify completion */
720 	ret = mwifiex_shutdown_fw_complete(adapter);
721 
722 	return ret;
723 }
724 
725 /*
726  * This function downloads the firmware to the card.
727  *
728  * The actual download is preceded by two sanity checks -
729  *      - Check if firmware is already running
730  *      - Check if the interface is the winner to download the firmware
731  *
732  * ...and followed by another -
733  *      - Check if the firmware is downloaded successfully
734  *
735  * After download is successfully completed, the host interrupts are enabled.
736  */
737 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
738 		    struct mwifiex_fw_image *pmfw)
739 {
740 	int ret;
741 	u32 poll_num = 1;
742 
743 	if (adapter->if_ops.check_fw_status) {
744 		/* check if firmware is already running */
745 		ret = adapter->if_ops.check_fw_status(adapter, poll_num);
746 		if (!ret) {
747 			mwifiex_dbg(adapter, MSG,
748 				    "WLAN FW already running! Skip FW dnld\n");
749 			return 0;
750 		}
751 	}
752 
753 	/* check if we are the winner for downloading FW */
754 	if (adapter->if_ops.check_winner_status) {
755 		adapter->winner = 0;
756 		ret = adapter->if_ops.check_winner_status(adapter);
757 
758 		poll_num = MAX_FIRMWARE_POLL_TRIES;
759 		if (ret) {
760 			mwifiex_dbg(adapter, MSG,
761 				    "WLAN read winner status failed!\n");
762 			return ret;
763 		}
764 
765 		if (!adapter->winner) {
766 			mwifiex_dbg(adapter, MSG,
767 				    "WLAN is not the winner! Skip FW dnld\n");
768 			goto poll_fw;
769 		}
770 	}
771 
772 	if (pmfw) {
773 		/* Download firmware with helper */
774 		ret = adapter->if_ops.prog_fw(adapter, pmfw);
775 		if (ret) {
776 			mwifiex_dbg(adapter, ERROR,
777 				    "prog_fw failed ret=%#x\n", ret);
778 			return ret;
779 		}
780 	}
781 
782 poll_fw:
783 	/* Check if the firmware is downloaded successfully or not */
784 	ret = adapter->if_ops.check_fw_status(adapter, poll_num);
785 	if (ret)
786 		mwifiex_dbg(adapter, ERROR,
787 			    "FW failed to be active in time\n");
788 
789 	return ret;
790 }
791