summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/broadcom/b43legacy/pio.c
blob: cbb7613786191425ca1e3fead4b8a8e15eb706ad (plain)
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
// SPDX-License-Identifier: GPL-2.0-or-later
/*

  Broadcom B43legacy wireless driver

  PIO Transmission

  Copyright (c) 2005 Michael Buesch <m@bues.ch>


*/

#include "b43legacy.h"
#include "pio.h"
#include "main.h"
#include "xmit.h"

#include <linux/delay.h>
#include <linux/slab.h>


static void tx_start(struct b43legacy_pioqueue *queue)
{
	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
			    B43legacy_PIO_TXCTL_INIT);
}

static void tx_octet(struct b43legacy_pioqueue *queue,
		     u8 octet)
{
	if (queue->need_workarounds) {
		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
				    B43legacy_PIO_TXCTL_WRITELO);
	} else {
		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
				    B43legacy_PIO_TXCTL_WRITELO);
		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
	}
}

static u16 tx_get_next_word(const u8 *txhdr,
			    const u8 *packet,
			    size_t txhdr_size,
			    unsigned int *pos)
{
	const u8 *source;
	unsigned int i = *pos;
	u16 ret;

	if (i < txhdr_size)
		source = txhdr;
	else {
		source = packet;
		i -= txhdr_size;
	}
	ret = le16_to_cpu(*((__le16 *)(source + i)));
	*pos += 2;

	return ret;
}

static void tx_data(struct b43legacy_pioqueue *queue,
		    u8 *txhdr,
		    const u8 *packet,
		    unsigned int octets)
{
	u16 data;
	unsigned int i = 0;

	if (queue->need_workarounds) {
		data = tx_get_next_word(txhdr, packet,
					sizeof(struct b43legacy_txhdr_fw3), &i);
		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
	}
	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
			    B43legacy_PIO_TXCTL_WRITELO |
			    B43legacy_PIO_TXCTL_WRITEHI);
	while (i < octets - 1) {
		data = tx_get_next_word(txhdr, packet,
					sizeof(struct b43legacy_txhdr_fw3), &i);
		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
	}
	if (octets % 2)
		tx_octet(queue, packet[octets -
			 sizeof(struct b43legacy_txhdr_fw3) - 1]);
}

static void tx_complete(struct b43legacy_pioqueue *queue,
			struct sk_buff *skb)
{
	if (queue->need_workarounds) {
		b43legacy_pio_write(queue, B43legacy_PIO_TXDATA,
				    skb->data[skb->len - 1]);
		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
				    B43legacy_PIO_TXCTL_WRITELO |
				    B43legacy_PIO_TXCTL_COMPLETE);
	} else
		b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
				    B43legacy_PIO_TXCTL_COMPLETE);
}

static u16 generate_cookie(struct b43legacy_pioqueue *queue,
			   struct b43legacy_pio_txpacket *packet)
{
	u16 cookie = 0x0000;
	int packetindex;

	/* We use the upper 4 bits for the PIO
	 * controller ID and the lower 12 bits
	 * for the packet index (in the cache).
	 */
	switch (queue->mmio_base) {
	case B43legacy_MMIO_PIO1_BASE:
		break;
	case B43legacy_MMIO_PIO2_BASE:
		cookie = 0x1000;
		break;
	case B43legacy_MMIO_PIO3_BASE:
		cookie = 0x2000;
		break;
	case B43legacy_MMIO_PIO4_BASE:
		cookie = 0x3000;
		break;
	default:
		B43legacy_WARN_ON(1);
	}
	packetindex = pio_txpacket_getindex(packet);
	B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));
	cookie |= (u16)packetindex;

	return cookie;
}

static
struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,
					u16 cookie,
					struct b43legacy_pio_txpacket **packet)
{
	struct b43legacy_pio *pio = &dev->pio;
	struct b43legacy_pioqueue *queue = NULL;
	int packetindex;

	switch (cookie & 0xF000) {
	case 0x0000:
		queue = pio->queue0;
		break;
	case 0x1000:
		queue = pio->queue1;
		break;
	case 0x2000:
		queue = pio->queue2;
		break;
	case 0x3000:
		queue = pio->queue3;
		break;
	default:
		B43legacy_WARN_ON(1);
	}
	packetindex = (cookie & 0x0FFF);
	B43legacy_WARN_ON(!(packetindex >= 0 && packetindex
			  < B43legacy_PIO_MAXTXPACKETS));
	*packet = &(queue->tx_packets_cache[packetindex]);

	return queue;
}

union txhdr_union {
	struct b43legacy_txhdr_fw3 txhdr_fw3;
};

static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue,
				  struct sk_buff *skb,
				  struct b43legacy_pio_txpacket *packet,
				  size_t txhdr_size)
{
	union txhdr_union txhdr_data;
	u8 *txhdr = NULL;
	unsigned int octets;
	int err;

	txhdr = (u8 *)(&txhdr_data.txhdr_fw3);

	B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
	err = b43legacy_generate_txhdr(queue->dev,
				 txhdr, skb->data, skb->len,
				 IEEE80211_SKB_CB(skb),
				 generate_cookie(queue, packet));
	if (err)
		return err;

	tx_start(queue);
	octets = skb->len + txhdr_size;
	if (queue->need_workarounds)
		octets--;
	tx_data(queue, txhdr, (u8 *)skb->data, octets);
	tx_complete(queue, skb);

	return 0;
}

static void free_txpacket(struct b43legacy_pio_txpacket *packet,
			  int irq_context)
{
	struct b43legacy_pioqueue *queue = packet->queue;

	if (packet->skb) {
		if (irq_context)
			dev_kfree_skb_irq(packet->skb);
		else
			dev_kfree_skb(packet->skb);
	}
	list_move(&packet->list, &queue->txfree);
	queue->nr_txfree++;
}

static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)
{
	struct b43legacy_pioqueue *queue = packet->queue;
	struct sk_buff *skb = packet->skb;
	u16 octets;
	int err;

	octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3);
	if (queue->tx_devq_size < octets) {
		b43legacywarn(queue->dev->wl, "PIO queue too small. "
			"Dropping packet.\n");
		/* Drop it silently (return success) */
		free_txpacket(packet, 1);
		return 0;
	}
	B43legacy_WARN_ON(queue->tx_devq_packets >
			  B43legacy_PIO_MAXTXDEVQPACKETS);
	B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);
	/* Check if there is sufficient free space on the device
	 * TX queue. If not, return and let the TX tasklet
	 * retry later.
	 */
	if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)
		return -EBUSY;
	if (queue->tx_devq_used + octets > queue->tx_devq_size)
		return -EBUSY;
	/* Now poke the device. */
	err = pio_tx_write_fragment(queue, skb, packet,
			      sizeof(struct b43legacy_txhdr_fw3));
	if (unlikely(err == -ENOKEY)) {
		/* Drop this packet, as we don't have the encryption key
		 * anymore and must not transmit it unencrypted. */
		free_txpacket(packet, 1);
		return 0;
	}

	/* Account for the packet size.
	 * (We must not overflow the device TX queue)
	 */
	queue->tx_devq_packets++;
	queue->tx_devq_used += octets;

	/* Transmission started, everything ok, move the
	 * packet to the txrunning list.
	 */
	list_move_tail(&packet->list, &queue->txrunning);

	return 0;
}

static void tx_tasklet(unsigned long d)
{
	struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d;
	struct b43legacy_wldev *dev = queue->dev;
	unsigned long flags;
	struct b43legacy_pio_txpacket *packet, *tmp_packet;
	int err;
	u16 txctl;

	spin_lock_irqsave(&dev->wl->irq_lock, flags);
	if (queue->tx_frozen)
		goto out_unlock;
	txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);
	if (txctl & B43legacy_PIO_TXCTL_SUSPEND)
		goto out_unlock;

	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
		/* Try to transmit the packet. This can fail, if
		 * the device queue is full. In case of failure, the
		 * packet is left in the txqueue.
		 * If transmission succeed, the packet is moved to txrunning.
		 * If it is impossible to transmit the packet, it
		 * is dropped.
		 */
		err = pio_tx_packet(packet);
		if (err)
			break;
	}
out_unlock:
	spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
}

static void setup_txqueues(struct b43legacy_pioqueue *queue)
{
	struct b43legacy_pio_txpacket *packet;
	int i;

	queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;
	for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {
		packet = &(queue->tx_packets_cache[i]);

		packet->queue = queue;
		INIT_LIST_HEAD(&packet->list);

		list_add(&packet->list, &queue->txfree);
	}
}

static
struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
						    u16 pio_mmio_base)
{
	struct b43legacy_pioqueue *queue;
	u32 value;
	u16 qsize;

	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
	if (!queue)
		goto out;

	queue->dev = dev;
	queue->mmio_base = pio_mmio_base;
	queue->need_workarounds = (dev->dev->id.revision < 3);

	INIT_LIST_HEAD(&queue->txfree);
	INIT_LIST_HEAD(&queue->txqueue);
	INIT_LIST_HEAD(&queue->txrunning);
	tasklet_init(&queue->txtask, tx_tasklet,
		     (unsigned long)queue);

	value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
	value &= ~B43legacy_MACCTL_BE;
	b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value);

	qsize = b43legacy_read16(dev, queue->mmio_base
				 + B43legacy_PIO_TXQBUFSIZE);
	if (qsize == 0) {
		b43legacyerr(dev->wl, "This card does not support PIO "
		       "operation mode. Please use DMA mode "
		       "(module parameter pio=0).\n");
		goto err_freequeue;
	}
	if (qsize <= B43legacy_PIO_TXQADJUST) {
		b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
		       qsize);
		goto err_freequeue;
	}
	qsize -= B43legacy_PIO_TXQADJUST;
	queue->tx_devq_size = qsize;

	setup_txqueues(queue);

out:
	return queue;

err_freequeue:
	kfree(queue);
	queue = NULL;
	goto out;
}

static void cancel_transfers(struct b43legacy_pioqueue *queue)
{
	struct b43legacy_pio_txpacket *packet, *tmp_packet;

	tasklet_kill(&queue->txtask);

	list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
		free_txpacket(packet, 0);
	list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
		free_txpacket(packet, 0);
}

static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)
{
	if (!queue)
		return;

	cancel_transfers(queue);
	kfree(queue);
}

void b43legacy_pio_free(struct b43legacy_wldev *dev)
{
	struct b43legacy_pio *pio;

	if (!b43legacy_using_pio(dev))
		return;
	pio = &dev->pio;

	b43legacy_destroy_pioqueue(pio->queue3);
	pio->queue3 = NULL;
	b43legacy_destroy_pioqueue(pio->queue2);
	pio->queue2 = NULL;
	b43legacy_destroy_pioqueue(pio->queue1);
	pio->queue1 = NULL;
	b43legacy_destroy_pioqueue(pio->queue0);
	pio->queue0 = NULL;
}

int b43legacy_pio_init(struct b43legacy_wldev *dev)
{
	struct b43legacy_pio *pio = &dev->pio;
	struct b43legacy_pioqueue *queue;
	int err = -ENOMEM;

	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
	if (!queue)
		goto out;
	pio->queue0 = queue;

	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
	if (!queue)
		goto err_destroy0;
	pio->queue1 = queue;

	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
	if (!queue)
		goto err_destroy1;
	pio->queue2 = queue;

	queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
	if (!queue)
		goto err_destroy2;
	pio->queue3 = queue;

	if (dev->dev->id.revision < 3)
		dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND;

	b43legacydbg(dev->wl, "PIO initialized\n");
	err = 0;
out:
	return err;

err_destroy2:
	b43legacy_destroy_pioqueue(pio->queue2);
	pio->queue2 = NULL;
err_destroy1:
	b43legacy_destroy_pioqueue(pio->queue1);
	pio->queue1 = NULL;
err_destroy0:
	b43legacy_destroy_pioqueue(pio->queue0);
	pio->queue0 = NULL;
	goto out;
}

int b43legacy_pio_tx(struct b43legacy_wldev *dev,
		     struct sk_buff *skb)
{
	struct b43legacy_pioqueue *queue = dev->pio.queue1;
	struct b43legacy_pio_txpacket *packet;

	B43legacy_WARN_ON(queue->tx_suspended);
	B43legacy_WARN_ON(list_empty(&queue->txfree));

	packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
			    list);
	packet->skb = skb;

	list_move_tail(&packet->list, &queue->txqueue);
	queue->nr_txfree--;
	B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);

	tasklet_schedule(&queue->txtask);

	return 0;
}

void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
				   const struct b43legacy_txstatus *status)
{
	struct b43legacy_pioqueue *queue;
	struct b43legacy_pio_txpacket *packet;
	struct ieee80211_tx_info *info;
	int retry_limit;

	queue = parse_cookie(dev, status->cookie, &packet);
	B43legacy_WARN_ON(!queue);

	if (!packet->skb)
		return;

	queue->tx_devq_packets--;
	queue->tx_devq_used -= (packet->skb->len +
				sizeof(struct b43legacy_txhdr_fw3));

	info = IEEE80211_SKB_CB(packet->skb);

	/* preserve the confiured retry limit before clearing the status
	 * The xmit function has overwritten the rc's value with the actual
	 * retry limit done by the hardware */
	retry_limit = info->status.rates[0].count;
	ieee80211_tx_info_clear_status(info);

	if (status->acked)
		info->flags |= IEEE80211_TX_STAT_ACK;

	if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
		/*
		 * If the short retries (RTS, not data frame) have exceeded
		 * the limit, the hw will not have tried the selected rate,
		 * but will have used the fallback rate instead.
		 * Don't let the rate control count attempts for the selected
		 * rate in this case, otherwise the statistics will be off.
		 */
		info->status.rates[0].count = 0;
		info->status.rates[1].count = status->frame_count;
	} else {
		if (status->frame_count > retry_limit) {
			info->status.rates[0].count = retry_limit;
			info->status.rates[1].count = status->frame_count -
					retry_limit;

		} else {
			info->status.rates[0].count = status->frame_count;
			info->status.rates[1].idx = -1;
		}
	}
	ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb);
	packet->skb = NULL;

	free_txpacket(packet, 1);
	/* If there are packets on the txqueue, poke the tasklet
	 * to transmit them.
	 */
	if (!list_empty(&queue->txqueue))
		tasklet_schedule(&queue->txtask);
}

static void pio_rx_error(struct b43legacy_pioqueue *queue,
			 int clear_buffers,
			 const char *error)
{
	int i;

	b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
	b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
			    B43legacy_PIO_RXCTL_READY);
	if (clear_buffers) {
		B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
		for (i = 0; i < 15; i++) {
			/* Dummy read. */
			b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
		}
	}
}

void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
{
	__le16 preamble[21] = { 0 };
	struct b43legacy_rxhdr_fw3 *rxhdr;
	u16 tmp;
	u16 len;
	u16 macstat;
	int i;
	int preamble_readwords;
	struct sk_buff *skb;

	tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
	if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
		return;
	b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
			    B43legacy_PIO_RXCTL_DATAAVAILABLE);

	for (i = 0; i < 10; i++) {
		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
		if (tmp & B43legacy_PIO_RXCTL_READY)
			goto data_ready;
		udelay(10);
	}
	b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
	return;
data_ready:

	len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
	if (unlikely(len > 0x700)) {
		pio_rx_error(queue, 0, "len > 0x700");
		return;
	}
	if (unlikely(len == 0 && queue->mmio_base !=
		     B43legacy_MMIO_PIO4_BASE)) {
		pio_rx_error(queue, 0, "len == 0");
		return;
	}
	preamble[0] = cpu_to_le16(len);
	if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
		preamble_readwords = 14 / sizeof(u16);
	else
		preamble_readwords = 18 / sizeof(u16);
	for (i = 0; i < preamble_readwords; i++) {
		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
		preamble[i + 1] = cpu_to_le16(tmp);
	}
	rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
	macstat = le16_to_cpu(rxhdr->mac_status);
	if (macstat & B43legacy_RX_MAC_FCSERR) {
		pio_rx_error(queue,
			     (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
			     "Frame FCS error");
		return;
	}
	if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
		/* We received an xmit status. */
		struct b43legacy_hwtxstatus *hw;

		hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
		b43legacy_handle_hwtxstatus(queue->dev, hw);

		return;
	}

	skb = dev_alloc_skb(len);
	if (unlikely(!skb)) {
		pio_rx_error(queue, 1, "OOM");
		return;
	}
	skb_put(skb, len);
	for (i = 0; i < len - 1; i += 2) {
		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
		*((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
	}
	if (len % 2) {
		tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
		skb->data[len - 1] = (tmp & 0x00FF);
	}
	b43legacy_rx(queue->dev, skb, rxhdr);
}

void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
{
	b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
			    b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
			    | B43legacy_PIO_TXCTL_SUSPEND);
}

void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
{
	b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
			    b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
			    & ~B43legacy_PIO_TXCTL_SUSPEND);
	b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
	tasklet_schedule(&queue->txtask);
}

void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
{
	struct b43legacy_pio *pio;

	B43legacy_WARN_ON(!b43legacy_using_pio(dev));
	pio = &dev->pio;
	pio->queue0->tx_frozen = 1;
	pio->queue1->tx_frozen = 1;
	pio->queue2->tx_frozen = 1;
	pio->queue3->tx_frozen = 1;
}

void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
{
	struct b43legacy_pio *pio;

	B43legacy_WARN_ON(!b43legacy_using_pio(dev));
	pio = &dev->pio;
	pio->queue0->tx_frozen = 0;
	pio->queue1->tx_frozen = 0;
	pio->queue2->tx_frozen = 0;
	pio->queue3->tx_frozen = 0;
	if (!list_empty(&pio->queue0->txqueue))
		tasklet_schedule(&pio->queue0->txtask);
	if (!list_empty(&pio->queue1->txqueue))
		tasklet_schedule(&pio->queue1->txtask);
	if (!list_empty(&pio->queue2->txqueue))
		tasklet_schedule(&pio->queue2->txtask);
	if (!list_empty(&pio->queue3->txqueue))
		tasklet_schedule(&pio->queue3->txtask);
}