1 /*
2
3 Broadcom B43legacy wireless driver
4
5 PIO Transmission
6
7 Copyright (c) 2005 Michael Buesch <mb@bu3sch.de>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU 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; see the file COPYING. If not, write to
21 the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
22 Boston, MA 02110-1301, USA.
23
24 */
25
26 #include "b43legacy.h"
27 #include "pio.h"
28 #include "main.h"
29 #include "xmit.h"
30
31 #include <linux/delay.h>
32
33
tx_start(struct b43legacy_pioqueue * queue)34 static void tx_start(struct b43legacy_pioqueue *queue)
35 {
36 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
37 B43legacy_PIO_TXCTL_INIT);
38 }
39
tx_octet(struct b43legacy_pioqueue * queue,u8 octet)40 static void tx_octet(struct b43legacy_pioqueue *queue,
41 u8 octet)
42 {
43 if (queue->need_workarounds) {
44 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
45 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
46 B43legacy_PIO_TXCTL_WRITELO);
47 } else {
48 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
49 B43legacy_PIO_TXCTL_WRITELO);
50 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet);
51 }
52 }
53
tx_get_next_word(const u8 * txhdr,const u8 * packet,size_t txhdr_size,unsigned int * pos)54 static u16 tx_get_next_word(const u8 *txhdr,
55 const u8 *packet,
56 size_t txhdr_size,
57 unsigned int *pos)
58 {
59 const u8 *source;
60 unsigned int i = *pos;
61 u16 ret;
62
63 if (i < txhdr_size)
64 source = txhdr;
65 else {
66 source = packet;
67 i -= txhdr_size;
68 }
69 ret = le16_to_cpu(*((__le16 *)(source + i)));
70 *pos += 2;
71
72 return ret;
73 }
74
tx_data(struct b43legacy_pioqueue * queue,u8 * txhdr,const u8 * packet,unsigned int octets)75 static void tx_data(struct b43legacy_pioqueue *queue,
76 u8 *txhdr,
77 const u8 *packet,
78 unsigned int octets)
79 {
80 u16 data;
81 unsigned int i = 0;
82
83 if (queue->need_workarounds) {
84 data = tx_get_next_word(txhdr, packet,
85 sizeof(struct b43legacy_txhdr_fw3), &i);
86 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
87 }
88 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
89 B43legacy_PIO_TXCTL_WRITELO |
90 B43legacy_PIO_TXCTL_WRITEHI);
91 while (i < octets - 1) {
92 data = tx_get_next_word(txhdr, packet,
93 sizeof(struct b43legacy_txhdr_fw3), &i);
94 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data);
95 }
96 if (octets % 2)
97 tx_octet(queue, packet[octets -
98 sizeof(struct b43legacy_txhdr_fw3) - 1]);
99 }
100
tx_complete(struct b43legacy_pioqueue * queue,struct sk_buff * skb)101 static void tx_complete(struct b43legacy_pioqueue *queue,
102 struct sk_buff *skb)
103 {
104 if (queue->need_workarounds) {
105 b43legacy_pio_write(queue, B43legacy_PIO_TXDATA,
106 skb->data[skb->len - 1]);
107 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
108 B43legacy_PIO_TXCTL_WRITELO |
109 B43legacy_PIO_TXCTL_COMPLETE);
110 } else
111 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
112 B43legacy_PIO_TXCTL_COMPLETE);
113 }
114
generate_cookie(struct b43legacy_pioqueue * queue,struct b43legacy_pio_txpacket * packet)115 static u16 generate_cookie(struct b43legacy_pioqueue *queue,
116 struct b43legacy_pio_txpacket *packet)
117 {
118 u16 cookie = 0x0000;
119 int packetindex;
120
121 /* We use the upper 4 bits for the PIO
122 * controller ID and the lower 12 bits
123 * for the packet index (in the cache).
124 */
125 switch (queue->mmio_base) {
126 case B43legacy_MMIO_PIO1_BASE:
127 break;
128 case B43legacy_MMIO_PIO2_BASE:
129 cookie = 0x1000;
130 break;
131 case B43legacy_MMIO_PIO3_BASE:
132 cookie = 0x2000;
133 break;
134 case B43legacy_MMIO_PIO4_BASE:
135 cookie = 0x3000;
136 break;
137 default:
138 B43legacy_WARN_ON(1);
139 }
140 packetindex = pio_txpacket_getindex(packet);
141 B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));
142 cookie |= (u16)packetindex;
143
144 return cookie;
145 }
146
147 static
parse_cookie(struct b43legacy_wldev * dev,u16 cookie,struct b43legacy_pio_txpacket ** packet)148 struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,
149 u16 cookie,
150 struct b43legacy_pio_txpacket **packet)
151 {
152 struct b43legacy_pio *pio = &dev->pio;
153 struct b43legacy_pioqueue *queue = NULL;
154 int packetindex;
155
156 switch (cookie & 0xF000) {
157 case 0x0000:
158 queue = pio->queue0;
159 break;
160 case 0x1000:
161 queue = pio->queue1;
162 break;
163 case 0x2000:
164 queue = pio->queue2;
165 break;
166 case 0x3000:
167 queue = pio->queue3;
168 break;
169 default:
170 B43legacy_WARN_ON(1);
171 }
172 packetindex = (cookie & 0x0FFF);
173 B43legacy_WARN_ON(!(packetindex >= 0 && packetindex
174 < B43legacy_PIO_MAXTXPACKETS));
175 *packet = &(queue->tx_packets_cache[packetindex]);
176
177 return queue;
178 }
179
180 union txhdr_union {
181 struct b43legacy_txhdr_fw3 txhdr_fw3;
182 };
183
pio_tx_write_fragment(struct b43legacy_pioqueue * queue,struct sk_buff * skb,struct b43legacy_pio_txpacket * packet,size_t txhdr_size)184 static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue,
185 struct sk_buff *skb,
186 struct b43legacy_pio_txpacket *packet,
187 size_t txhdr_size)
188 {
189 union txhdr_union txhdr_data;
190 u8 *txhdr = NULL;
191 unsigned int octets;
192 int err;
193
194 txhdr = (u8 *)(&txhdr_data.txhdr_fw3);
195
196 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
197 err = b43legacy_generate_txhdr(queue->dev,
198 txhdr, skb->data, skb->len,
199 IEEE80211_SKB_CB(skb),
200 generate_cookie(queue, packet));
201 if (err)
202 return err;
203
204 tx_start(queue);
205 octets = skb->len + txhdr_size;
206 if (queue->need_workarounds)
207 octets--;
208 tx_data(queue, txhdr, (u8 *)skb->data, octets);
209 tx_complete(queue, skb);
210
211 return 0;
212 }
213
free_txpacket(struct b43legacy_pio_txpacket * packet,int irq_context)214 static void free_txpacket(struct b43legacy_pio_txpacket *packet,
215 int irq_context)
216 {
217 struct b43legacy_pioqueue *queue = packet->queue;
218
219 if (packet->skb) {
220 if (irq_context)
221 dev_kfree_skb_irq(packet->skb);
222 else
223 dev_kfree_skb(packet->skb);
224 }
225 list_move(&packet->list, &queue->txfree);
226 queue->nr_txfree++;
227 }
228
pio_tx_packet(struct b43legacy_pio_txpacket * packet)229 static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)
230 {
231 struct b43legacy_pioqueue *queue = packet->queue;
232 struct sk_buff *skb = packet->skb;
233 u16 octets;
234 int err;
235
236 octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3);
237 if (queue->tx_devq_size < octets) {
238 b43legacywarn(queue->dev->wl, "PIO queue too small. "
239 "Dropping packet.\n");
240 /* Drop it silently (return success) */
241 free_txpacket(packet, 1);
242 return 0;
243 }
244 B43legacy_WARN_ON(queue->tx_devq_packets >
245 B43legacy_PIO_MAXTXDEVQPACKETS);
246 B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);
247 /* Check if there is sufficient free space on the device
248 * TX queue. If not, return and let the TX tasklet
249 * retry later.
250 */
251 if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)
252 return -EBUSY;
253 if (queue->tx_devq_used + octets > queue->tx_devq_size)
254 return -EBUSY;
255 /* Now poke the device. */
256 err = pio_tx_write_fragment(queue, skb, packet,
257 sizeof(struct b43legacy_txhdr_fw3));
258 if (unlikely(err == -ENOKEY)) {
259 /* Drop this packet, as we don't have the encryption key
260 * anymore and must not transmit it unencrypted. */
261 free_txpacket(packet, 1);
262 return 0;
263 }
264
265 /* Account for the packet size.
266 * (We must not overflow the device TX queue)
267 */
268 queue->tx_devq_packets++;
269 queue->tx_devq_used += octets;
270
271 /* Transmission started, everything ok, move the
272 * packet to the txrunning list.
273 */
274 list_move_tail(&packet->list, &queue->txrunning);
275
276 return 0;
277 }
278
tx_tasklet(unsigned long d)279 static void tx_tasklet(unsigned long d)
280 {
281 struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d;
282 struct b43legacy_wldev *dev = queue->dev;
283 unsigned long flags;
284 struct b43legacy_pio_txpacket *packet, *tmp_packet;
285 int err;
286 u16 txctl;
287
288 spin_lock_irqsave(&dev->wl->irq_lock, flags);
289 if (queue->tx_frozen)
290 goto out_unlock;
291 txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);
292 if (txctl & B43legacy_PIO_TXCTL_SUSPEND)
293 goto out_unlock;
294
295 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
296 /* Try to transmit the packet. This can fail, if
297 * the device queue is full. In case of failure, the
298 * packet is left in the txqueue.
299 * If transmission succeed, the packet is moved to txrunning.
300 * If it is impossible to transmit the packet, it
301 * is dropped.
302 */
303 err = pio_tx_packet(packet);
304 if (err)
305 break;
306 }
307 out_unlock:
308 spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
309 }
310
setup_txqueues(struct b43legacy_pioqueue * queue)311 static void setup_txqueues(struct b43legacy_pioqueue *queue)
312 {
313 struct b43legacy_pio_txpacket *packet;
314 int i;
315
316 queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;
317 for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {
318 packet = &(queue->tx_packets_cache[i]);
319
320 packet->queue = queue;
321 INIT_LIST_HEAD(&packet->list);
322
323 list_add(&packet->list, &queue->txfree);
324 }
325 }
326
327 static
b43legacy_setup_pioqueue(struct b43legacy_wldev * dev,u16 pio_mmio_base)328 struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
329 u16 pio_mmio_base)
330 {
331 struct b43legacy_pioqueue *queue;
332 u32 value;
333 u16 qsize;
334
335 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
336 if (!queue)
337 goto out;
338
339 queue->dev = dev;
340 queue->mmio_base = pio_mmio_base;
341 queue->need_workarounds = (dev->dev->id.revision < 3);
342
343 INIT_LIST_HEAD(&queue->txfree);
344 INIT_LIST_HEAD(&queue->txqueue);
345 INIT_LIST_HEAD(&queue->txrunning);
346 tasklet_init(&queue->txtask, tx_tasklet,
347 (unsigned long)queue);
348
349 value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
350 value &= ~B43legacy_MACCTL_BE;
351 b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value);
352
353 qsize = b43legacy_read16(dev, queue->mmio_base
354 + B43legacy_PIO_TXQBUFSIZE);
355 if (qsize == 0) {
356 b43legacyerr(dev->wl, "This card does not support PIO "
357 "operation mode. Please use DMA mode "
358 "(module parameter pio=0).\n");
359 goto err_freequeue;
360 }
361 if (qsize <= B43legacy_PIO_TXQADJUST) {
362 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
363 qsize);
364 goto err_freequeue;
365 }
366 qsize -= B43legacy_PIO_TXQADJUST;
367 queue->tx_devq_size = qsize;
368
369 setup_txqueues(queue);
370
371 out:
372 return queue;
373
374 err_freequeue:
375 kfree(queue);
376 queue = NULL;
377 goto out;
378 }
379
cancel_transfers(struct b43legacy_pioqueue * queue)380 static void cancel_transfers(struct b43legacy_pioqueue *queue)
381 {
382 struct b43legacy_pio_txpacket *packet, *tmp_packet;
383
384 tasklet_disable(&queue->txtask);
385
386 list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
387 free_txpacket(packet, 0);
388 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
389 free_txpacket(packet, 0);
390 }
391
b43legacy_destroy_pioqueue(struct b43legacy_pioqueue * queue)392 static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)
393 {
394 if (!queue)
395 return;
396
397 cancel_transfers(queue);
398 kfree(queue);
399 }
400
b43legacy_pio_free(struct b43legacy_wldev * dev)401 void b43legacy_pio_free(struct b43legacy_wldev *dev)
402 {
403 struct b43legacy_pio *pio;
404
405 if (!b43legacy_using_pio(dev))
406 return;
407 pio = &dev->pio;
408
409 b43legacy_destroy_pioqueue(pio->queue3);
410 pio->queue3 = NULL;
411 b43legacy_destroy_pioqueue(pio->queue2);
412 pio->queue2 = NULL;
413 b43legacy_destroy_pioqueue(pio->queue1);
414 pio->queue1 = NULL;
415 b43legacy_destroy_pioqueue(pio->queue0);
416 pio->queue0 = NULL;
417 }
418
b43legacy_pio_init(struct b43legacy_wldev * dev)419 int b43legacy_pio_init(struct b43legacy_wldev *dev)
420 {
421 struct b43legacy_pio *pio = &dev->pio;
422 struct b43legacy_pioqueue *queue;
423 int err = -ENOMEM;
424
425 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
426 if (!queue)
427 goto out;
428 pio->queue0 = queue;
429
430 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
431 if (!queue)
432 goto err_destroy0;
433 pio->queue1 = queue;
434
435 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
436 if (!queue)
437 goto err_destroy1;
438 pio->queue2 = queue;
439
440 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
441 if (!queue)
442 goto err_destroy2;
443 pio->queue3 = queue;
444
445 if (dev->dev->id.revision < 3)
446 dev->irq_savedstate |= B43legacy_IRQ_PIO_WORKAROUND;
447
448 b43legacydbg(dev->wl, "PIO initialized\n");
449 err = 0;
450 out:
451 return err;
452
453 err_destroy2:
454 b43legacy_destroy_pioqueue(pio->queue2);
455 pio->queue2 = NULL;
456 err_destroy1:
457 b43legacy_destroy_pioqueue(pio->queue1);
458 pio->queue1 = NULL;
459 err_destroy0:
460 b43legacy_destroy_pioqueue(pio->queue0);
461 pio->queue0 = NULL;
462 goto out;
463 }
464
b43legacy_pio_tx(struct b43legacy_wldev * dev,struct sk_buff * skb)465 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
466 struct sk_buff *skb)
467 {
468 struct b43legacy_pioqueue *queue = dev->pio.queue1;
469 struct b43legacy_pio_txpacket *packet;
470
471 B43legacy_WARN_ON(queue->tx_suspended);
472 B43legacy_WARN_ON(list_empty(&queue->txfree));
473
474 packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
475 list);
476 packet->skb = skb;
477
478 list_move_tail(&packet->list, &queue->txqueue);
479 queue->nr_txfree--;
480 queue->nr_tx_packets++;
481 B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);
482
483 tasklet_schedule(&queue->txtask);
484
485 return 0;
486 }
487
b43legacy_pio_handle_txstatus(struct b43legacy_wldev * dev,const struct b43legacy_txstatus * status)488 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
489 const struct b43legacy_txstatus *status)
490 {
491 struct b43legacy_pioqueue *queue;
492 struct b43legacy_pio_txpacket *packet;
493 struct ieee80211_tx_info *info;
494 int retry_limit;
495
496 queue = parse_cookie(dev, status->cookie, &packet);
497 B43legacy_WARN_ON(!queue);
498
499 if (!packet->skb)
500 return;
501
502 queue->tx_devq_packets--;
503 queue->tx_devq_used -= (packet->skb->len +
504 sizeof(struct b43legacy_txhdr_fw3));
505
506 info = IEEE80211_SKB_CB(packet->skb);
507
508 /* preserve the confiured retry limit before clearing the status
509 * The xmit function has overwritten the rc's value with the actual
510 * retry limit done by the hardware */
511 retry_limit = info->status.rates[0].count;
512 ieee80211_tx_info_clear_status(info);
513
514 if (status->acked)
515 info->flags |= IEEE80211_TX_STAT_ACK;
516
517 if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
518 /*
519 * If the short retries (RTS, not data frame) have exceeded
520 * the limit, the hw will not have tried the selected rate,
521 * but will have used the fallback rate instead.
522 * Don't let the rate control count attempts for the selected
523 * rate in this case, otherwise the statistics will be off.
524 */
525 info->status.rates[0].count = 0;
526 info->status.rates[1].count = status->frame_count;
527 } else {
528 if (status->frame_count > retry_limit) {
529 info->status.rates[0].count = retry_limit;
530 info->status.rates[1].count = status->frame_count -
531 retry_limit;
532
533 } else {
534 info->status.rates[0].count = status->frame_count;
535 info->status.rates[1].idx = -1;
536 }
537 }
538 ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb);
539 packet->skb = NULL;
540
541 free_txpacket(packet, 1);
542 /* If there are packets on the txqueue, poke the tasklet
543 * to transmit them.
544 */
545 if (!list_empty(&queue->txqueue))
546 tasklet_schedule(&queue->txtask);
547 }
548
b43legacy_pio_get_tx_stats(struct b43legacy_wldev * dev,struct ieee80211_tx_queue_stats * stats)549 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
550 struct ieee80211_tx_queue_stats *stats)
551 {
552 struct b43legacy_pio *pio = &dev->pio;
553 struct b43legacy_pioqueue *queue;
554
555 queue = pio->queue1;
556 stats[0].len = B43legacy_PIO_MAXTXPACKETS - queue->nr_txfree;
557 stats[0].limit = B43legacy_PIO_MAXTXPACKETS;
558 stats[0].count = queue->nr_tx_packets;
559 }
560
pio_rx_error(struct b43legacy_pioqueue * queue,int clear_buffers,const char * error)561 static void pio_rx_error(struct b43legacy_pioqueue *queue,
562 int clear_buffers,
563 const char *error)
564 {
565 int i;
566
567 b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
568 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
569 B43legacy_PIO_RXCTL_READY);
570 if (clear_buffers) {
571 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
572 for (i = 0; i < 15; i++) {
573 /* Dummy read. */
574 b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
575 }
576 }
577 }
578
b43legacy_pio_rx(struct b43legacy_pioqueue * queue)579 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
580 {
581 __le16 preamble[21] = { 0 };
582 struct b43legacy_rxhdr_fw3 *rxhdr;
583 u16 tmp;
584 u16 len;
585 u16 macstat;
586 int i;
587 int preamble_readwords;
588 struct sk_buff *skb;
589
590 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
591 if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
592 return;
593 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
594 B43legacy_PIO_RXCTL_DATAAVAILABLE);
595
596 for (i = 0; i < 10; i++) {
597 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
598 if (tmp & B43legacy_PIO_RXCTL_READY)
599 goto data_ready;
600 udelay(10);
601 }
602 b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
603 return;
604 data_ready:
605
606 len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
607 if (unlikely(len > 0x700)) {
608 pio_rx_error(queue, 0, "len > 0x700");
609 return;
610 }
611 if (unlikely(len == 0 && queue->mmio_base !=
612 B43legacy_MMIO_PIO4_BASE)) {
613 pio_rx_error(queue, 0, "len == 0");
614 return;
615 }
616 preamble[0] = cpu_to_le16(len);
617 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
618 preamble_readwords = 14 / sizeof(u16);
619 else
620 preamble_readwords = 18 / sizeof(u16);
621 for (i = 0; i < preamble_readwords; i++) {
622 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
623 preamble[i + 1] = cpu_to_le16(tmp);
624 }
625 rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
626 macstat = le16_to_cpu(rxhdr->mac_status);
627 if (macstat & B43legacy_RX_MAC_FCSERR) {
628 pio_rx_error(queue,
629 (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
630 "Frame FCS error");
631 return;
632 }
633 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
634 /* We received an xmit status. */
635 struct b43legacy_hwtxstatus *hw;
636
637 hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
638 b43legacy_handle_hwtxstatus(queue->dev, hw);
639
640 return;
641 }
642
643 skb = dev_alloc_skb(len);
644 if (unlikely(!skb)) {
645 pio_rx_error(queue, 1, "OOM");
646 return;
647 }
648 skb_put(skb, len);
649 for (i = 0; i < len - 1; i += 2) {
650 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
651 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
652 }
653 if (len % 2) {
654 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
655 skb->data[len - 1] = (tmp & 0x00FF);
656 }
657 b43legacy_rx(queue->dev, skb, rxhdr);
658 }
659
b43legacy_pio_tx_suspend(struct b43legacy_pioqueue * queue)660 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
661 {
662 b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
663 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
664 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
665 | B43legacy_PIO_TXCTL_SUSPEND);
666 }
667
b43legacy_pio_tx_resume(struct b43legacy_pioqueue * queue)668 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
669 {
670 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
671 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
672 & ~B43legacy_PIO_TXCTL_SUSPEND);
673 b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
674 tasklet_schedule(&queue->txtask);
675 }
676
b43legacy_pio_freeze_txqueues(struct b43legacy_wldev * dev)677 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
678 {
679 struct b43legacy_pio *pio;
680
681 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
682 pio = &dev->pio;
683 pio->queue0->tx_frozen = 1;
684 pio->queue1->tx_frozen = 1;
685 pio->queue2->tx_frozen = 1;
686 pio->queue3->tx_frozen = 1;
687 }
688
b43legacy_pio_thaw_txqueues(struct b43legacy_wldev * dev)689 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
690 {
691 struct b43legacy_pio *pio;
692
693 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
694 pio = &dev->pio;
695 pio->queue0->tx_frozen = 0;
696 pio->queue1->tx_frozen = 0;
697 pio->queue2->tx_frozen = 0;
698 pio->queue3->tx_frozen = 0;
699 if (!list_empty(&pio->queue0->txqueue))
700 tasklet_schedule(&pio->queue0->txtask);
701 if (!list_empty(&pio->queue1->txqueue))
702 tasklet_schedule(&pio->queue1->txtask);
703 if (!list_empty(&pio->queue2->txqueue))
704 tasklet_schedule(&pio->queue2->txtask);
705 if (!list_empty(&pio->queue3->txqueue))
706 tasklet_schedule(&pio->queue3->txtask);
707 }
708