Merge branch 'master' of /home/trondmy/kernel/linux-2.6/ into merge_linus
[linux-2.6] / drivers / net / wireless / bcm43xx / bcm43xx_pio.c
1 /*
2
3   Broadcom BCM43xx wireless driver
4
5   PIO Transmission
6
7   Copyright (c) 2005 Michael Buesch <mbuesch@freenet.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 "bcm43xx.h"
27 #include "bcm43xx_pio.h"
28 #include "bcm43xx_main.h"
29 #include "bcm43xx_xmit.h"
30 #include "bcm43xx_power.h"
31
32 #include <linux/delay.h>
33
34
35 static void tx_start(struct bcm43xx_pioqueue *queue)
36 {
37         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
38                           BCM43xx_PIO_TXCTL_INIT);
39 }
40
41 static void tx_octet(struct bcm43xx_pioqueue *queue,
42                      u8 octet)
43 {
44         if (queue->need_workarounds) {
45                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
46                                   octet);
47                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
48                                   BCM43xx_PIO_TXCTL_WRITELO);
49         } else {
50                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
51                                   BCM43xx_PIO_TXCTL_WRITELO);
52                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
53                                   octet);
54         }
55 }
56
57 static u16 tx_get_next_word(struct bcm43xx_txhdr *txhdr,
58                             const u8 *packet,
59                             unsigned int *pos)
60 {
61         const u8 *source;
62         unsigned int i = *pos;
63         u16 ret;
64
65         if (i < sizeof(*txhdr)) {
66                 source = (const u8 *)txhdr;
67         } else {
68                 source = packet;
69                 i -= sizeof(*txhdr);
70         }
71         ret = le16_to_cpu( *((u16 *)(source + i)) );
72         *pos += 2;
73
74         return ret;
75 }
76
77 static void tx_data(struct bcm43xx_pioqueue *queue,
78                     struct bcm43xx_txhdr *txhdr,
79                     const u8 *packet,
80                     unsigned int octets)
81 {
82         u16 data;
83         unsigned int i = 0;
84
85         if (queue->need_workarounds) {
86                 data = tx_get_next_word(txhdr, packet, &i);
87                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
88         }
89         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
90                           BCM43xx_PIO_TXCTL_WRITELO |
91                           BCM43xx_PIO_TXCTL_WRITEHI);
92         while (i < octets - 1) {
93                 data = tx_get_next_word(txhdr, packet, &i);
94                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
95         }
96         if (octets % 2)
97                 tx_octet(queue, packet[octets - sizeof(*txhdr) - 1]);
98 }
99
100 static void tx_complete(struct bcm43xx_pioqueue *queue,
101                         struct sk_buff *skb)
102 {
103         if (queue->need_workarounds) {
104                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
105                                   skb->data[skb->len - 1]);
106                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
107                                   BCM43xx_PIO_TXCTL_WRITELO |
108                                   BCM43xx_PIO_TXCTL_COMPLETE);
109         } else {
110                 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
111                                   BCM43xx_PIO_TXCTL_COMPLETE);
112         }
113 }
114
115 static u16 generate_cookie(struct bcm43xx_pioqueue *queue,
116                            struct bcm43xx_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 BCM43xx_MMIO_PIO1_BASE:
127                 break;
128         case BCM43xx_MMIO_PIO2_BASE:
129                 cookie = 0x1000;
130                 break;
131         case BCM43xx_MMIO_PIO3_BASE:
132                 cookie = 0x2000;
133                 break;
134         case BCM43xx_MMIO_PIO4_BASE:
135                 cookie = 0x3000;
136                 break;
137         default:
138                 assert(0);
139         }
140         packetindex = pio_txpacket_getindex(packet);
141         assert(((u16)packetindex & 0xF000) == 0x0000);
142         cookie |= (u16)packetindex;
143
144         return cookie;
145 }
146
147 static
148 struct bcm43xx_pioqueue * parse_cookie(struct bcm43xx_private *bcm,
149                                        u16 cookie,
150                                        struct bcm43xx_pio_txpacket **packet)
151 {
152         struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
153         struct bcm43xx_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                 assert(0);
171         }
172         packetindex = (cookie & 0x0FFF);
173         assert(packetindex >= 0 && packetindex < BCM43xx_PIO_MAXTXPACKETS);
174         *packet = &(queue->tx_packets_cache[packetindex]);
175
176         return queue;
177 }
178
179 static void pio_tx_write_fragment(struct bcm43xx_pioqueue *queue,
180                                   struct sk_buff *skb,
181                                   struct bcm43xx_pio_txpacket *packet)
182 {
183         struct bcm43xx_txhdr txhdr;
184         unsigned int octets;
185
186         assert(skb_shinfo(skb)->nr_frags == 0);
187         bcm43xx_generate_txhdr(queue->bcm,
188                                &txhdr, skb->data, skb->len,
189                                (packet->xmitted_frags == 0),
190                                generate_cookie(queue, packet));
191
192         tx_start(queue);
193         octets = skb->len + sizeof(txhdr);
194         if (queue->need_workarounds)
195                 octets--;
196         tx_data(queue, &txhdr, (u8 *)skb->data, octets);
197         tx_complete(queue, skb);
198 }
199
200 static void free_txpacket(struct bcm43xx_pio_txpacket *packet,
201                           int irq_context)
202 {
203         struct bcm43xx_pioqueue *queue = packet->queue;
204
205         ieee80211_txb_free(packet->txb);
206         list_move(&packet->list, &queue->txfree);
207         queue->nr_txfree++;
208
209         assert(queue->tx_devq_used >= packet->xmitted_octets);
210         assert(queue->tx_devq_packets >= packet->xmitted_frags);
211         queue->tx_devq_used -= packet->xmitted_octets;
212         queue->tx_devq_packets -= packet->xmitted_frags;
213 }
214
215 static int pio_tx_packet(struct bcm43xx_pio_txpacket *packet)
216 {
217         struct bcm43xx_pioqueue *queue = packet->queue;
218         struct ieee80211_txb *txb = packet->txb;
219         struct sk_buff *skb;
220         u16 octets;
221         int i;
222
223         for (i = packet->xmitted_frags; i < txb->nr_frags; i++) {
224                 skb = txb->fragments[i];
225
226                 octets = (u16)skb->len + sizeof(struct bcm43xx_txhdr);
227                 assert(queue->tx_devq_size >= octets);
228                 assert(queue->tx_devq_packets <= BCM43xx_PIO_MAXTXDEVQPACKETS);
229                 assert(queue->tx_devq_used <= queue->tx_devq_size);
230                 /* Check if there is sufficient free space on the device
231                  * TX queue. If not, return and let the TX tasklet
232                  * retry later.
233                  */
234                 if (queue->tx_devq_packets == BCM43xx_PIO_MAXTXDEVQPACKETS)
235                         return -EBUSY;
236                 if (queue->tx_devq_used + octets > queue->tx_devq_size)
237                         return -EBUSY;
238                 /* Now poke the device. */
239                 pio_tx_write_fragment(queue, skb, packet);
240
241                 /* Account for the packet size.
242                  * (We must not overflow the device TX queue)
243                  */
244                 queue->tx_devq_packets++;
245                 queue->tx_devq_used += octets;
246
247                 assert(packet->xmitted_frags < packet->txb->nr_frags);
248                 packet->xmitted_frags++;
249                 packet->xmitted_octets += octets;
250         }
251         list_move_tail(&packet->list, &queue->txrunning);
252
253         return 0;
254 }
255
256 static void tx_tasklet(unsigned long d)
257 {
258         struct bcm43xx_pioqueue *queue = (struct bcm43xx_pioqueue *)d;
259         struct bcm43xx_private *bcm = queue->bcm;
260         unsigned long flags;
261         struct bcm43xx_pio_txpacket *packet, *tmp_packet;
262         int err;
263         u16 txctl;
264
265         spin_lock_irqsave(&bcm->irq_lock, flags);
266
267         if (queue->tx_frozen)
268                 goto out_unlock;
269         txctl = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
270         if (txctl & BCM43xx_PIO_TXCTL_SUSPEND)
271                 goto out_unlock;
272
273         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
274                 assert(packet->xmitted_frags < packet->txb->nr_frags);
275                 if (packet->xmitted_frags == 0) {
276                         int i;
277                         struct sk_buff *skb;
278
279                         /* Check if the device queue is big
280                          * enough for every fragment. If not, drop the
281                          * whole packet.
282                          */
283                         for (i = 0; i < packet->txb->nr_frags; i++) {
284                                 skb = packet->txb->fragments[i];
285                                 if (unlikely(skb->len > queue->tx_devq_size)) {
286                                         dprintkl(KERN_ERR PFX "PIO TX device queue too small. "
287                                                               "Dropping packet.\n");
288                                         free_txpacket(packet, 1);
289                                         goto next_packet;
290                                 }
291                         }
292                 }
293                 /* Try to transmit the packet.
294                  * This may not completely succeed.
295                  */
296                 err = pio_tx_packet(packet);
297                 if (err)
298                         break;
299         next_packet:
300                 continue;
301         }
302 out_unlock:
303         spin_unlock_irqrestore(&bcm->irq_lock, flags);
304 }
305
306 static void setup_txqueues(struct bcm43xx_pioqueue *queue)
307 {
308         struct bcm43xx_pio_txpacket *packet;
309         int i;
310
311         queue->nr_txfree = BCM43xx_PIO_MAXTXPACKETS;
312         for (i = 0; i < BCM43xx_PIO_MAXTXPACKETS; i++) {
313                 packet = &(queue->tx_packets_cache[i]);
314
315                 packet->queue = queue;
316                 INIT_LIST_HEAD(&packet->list);
317
318                 list_add(&packet->list, &queue->txfree);
319         }
320 }
321
322 static
323 struct bcm43xx_pioqueue * bcm43xx_setup_pioqueue(struct bcm43xx_private *bcm,
324                                                  u16 pio_mmio_base)
325 {
326         struct bcm43xx_pioqueue *queue;
327         u32 value;
328         u16 qsize;
329
330         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
331         if (!queue)
332                 goto out;
333
334         queue->bcm = bcm;
335         queue->mmio_base = pio_mmio_base;
336         queue->need_workarounds = (bcm->current_core->rev < 3);
337
338         INIT_LIST_HEAD(&queue->txfree);
339         INIT_LIST_HEAD(&queue->txqueue);
340         INIT_LIST_HEAD(&queue->txrunning);
341         tasklet_init(&queue->txtask, tx_tasklet,
342                      (unsigned long)queue);
343
344         value = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
345         value &= ~BCM43xx_SBF_XFER_REG_BYTESWAP;
346         bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, value);
347
348         qsize = bcm43xx_read16(bcm, queue->mmio_base + BCM43xx_PIO_TXQBUFSIZE);
349         if (qsize == 0) {
350                 printk(KERN_ERR PFX "ERROR: This card does not support PIO "
351                                     "operation mode. Please use DMA mode "
352                                     "(module parameter pio=0).\n");
353                 goto err_freequeue;
354         }
355         if (qsize <= BCM43xx_PIO_TXQADJUST) {
356                 printk(KERN_ERR PFX "PIO tx device-queue too small (%u)\n",
357                        qsize);
358                 goto err_freequeue;
359         }
360         qsize -= BCM43xx_PIO_TXQADJUST;
361         queue->tx_devq_size = qsize;
362
363         setup_txqueues(queue);
364
365 out:
366         return queue;
367
368 err_freequeue:
369         kfree(queue);
370         queue = NULL;
371         goto out;
372 }
373
374 static void cancel_transfers(struct bcm43xx_pioqueue *queue)
375 {
376         struct bcm43xx_pio_txpacket *packet, *tmp_packet;
377
378         netif_tx_disable(queue->bcm->net_dev);
379         tasklet_disable(&queue->txtask);
380
381         list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
382                 free_txpacket(packet, 0);
383         list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
384                 free_txpacket(packet, 0);
385 }
386
387 static void bcm43xx_destroy_pioqueue(struct bcm43xx_pioqueue *queue)
388 {
389         if (!queue)
390                 return;
391
392         cancel_transfers(queue);
393         kfree(queue);
394 }
395
396 void bcm43xx_pio_free(struct bcm43xx_private *bcm)
397 {
398         struct bcm43xx_pio *pio;
399
400         if (!bcm43xx_using_pio(bcm))
401                 return;
402         pio = bcm43xx_current_pio(bcm);
403
404         bcm43xx_destroy_pioqueue(pio->queue3);
405         pio->queue3 = NULL;
406         bcm43xx_destroy_pioqueue(pio->queue2);
407         pio->queue2 = NULL;
408         bcm43xx_destroy_pioqueue(pio->queue1);
409         pio->queue1 = NULL;
410         bcm43xx_destroy_pioqueue(pio->queue0);
411         pio->queue0 = NULL;
412 }
413
414 int bcm43xx_pio_init(struct bcm43xx_private *bcm)
415 {
416         struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
417         struct bcm43xx_pioqueue *queue;
418         int err = -ENOMEM;
419
420         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO1_BASE);
421         if (!queue)
422                 goto out;
423         pio->queue0 = queue;
424
425         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO2_BASE);
426         if (!queue)
427                 goto err_destroy0;
428         pio->queue1 = queue;
429
430         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO3_BASE);
431         if (!queue)
432                 goto err_destroy1;
433         pio->queue2 = queue;
434
435         queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO4_BASE);
436         if (!queue)
437                 goto err_destroy2;
438         pio->queue3 = queue;
439
440         if (bcm->current_core->rev < 3)
441                 bcm->irq_savedstate |= BCM43xx_IRQ_PIO_WORKAROUND;
442
443         dprintk(KERN_INFO PFX "PIO initialized\n");
444         err = 0;
445 out:
446         return err;
447
448 err_destroy2:
449         bcm43xx_destroy_pioqueue(pio->queue2);
450         pio->queue2 = NULL;
451 err_destroy1:
452         bcm43xx_destroy_pioqueue(pio->queue1);
453         pio->queue1 = NULL;
454 err_destroy0:
455         bcm43xx_destroy_pioqueue(pio->queue0);
456         pio->queue0 = NULL;
457         goto out;
458 }
459
460 int bcm43xx_pio_tx(struct bcm43xx_private *bcm,
461                    struct ieee80211_txb *txb)
462 {
463         struct bcm43xx_pioqueue *queue = bcm43xx_current_pio(bcm)->queue1;
464         struct bcm43xx_pio_txpacket *packet;
465
466         assert(!queue->tx_suspended);
467         assert(!list_empty(&queue->txfree));
468
469         packet = list_entry(queue->txfree.next, struct bcm43xx_pio_txpacket, list);
470         packet->txb = txb;
471         packet->xmitted_frags = 0;
472         packet->xmitted_octets = 0;
473         list_move_tail(&packet->list, &queue->txqueue);
474         queue->nr_txfree--;
475         assert(queue->nr_txfree < BCM43xx_PIO_MAXTXPACKETS);
476
477         /* Suspend TX, if we are out of packets in the "free" queue. */
478         if (list_empty(&queue->txfree)) {
479                 netif_stop_queue(queue->bcm->net_dev);
480                 queue->tx_suspended = 1;
481         }
482
483         tasklet_schedule(&queue->txtask);
484
485         return 0;
486 }
487
488 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private *bcm,
489                                    struct bcm43xx_xmitstatus *status)
490 {
491         struct bcm43xx_pioqueue *queue;
492         struct bcm43xx_pio_txpacket *packet;
493
494         queue = parse_cookie(bcm, status->cookie, &packet);
495         assert(queue);
496
497         free_txpacket(packet, 1);
498         if (queue->tx_suspended) {
499                 queue->tx_suspended = 0;
500                 netif_wake_queue(queue->bcm->net_dev);
501         }
502         /* If there are packets on the txqueue, poke the tasklet
503          * to transmit them.
504          */
505         if (!list_empty(&queue->txqueue))
506                 tasklet_schedule(&queue->txtask);
507 }
508
509 static void pio_rx_error(struct bcm43xx_pioqueue *queue,
510                          int clear_buffers,
511                          const char *error)
512 {
513         int i;
514
515         printkl("PIO RX error: %s\n", error);
516         bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
517                           BCM43xx_PIO_RXCTL_READY);
518         if (clear_buffers) {
519                 assert(queue->mmio_base == BCM43xx_MMIO_PIO1_BASE);
520                 for (i = 0; i < 15; i++) {
521                         /* Dummy read. */
522                         bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
523                 }
524         }
525 }
526
527 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
528 {
529         u16 preamble[21] = { 0 };
530         struct bcm43xx_rxhdr *rxhdr;
531         u16 tmp, len, rxflags2;
532         int i, preamble_readwords;
533         struct sk_buff *skb;
534
535         tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
536         if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE))
537                 return;
538         bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
539                           BCM43xx_PIO_RXCTL_DATAAVAILABLE);
540
541         for (i = 0; i < 10; i++) {
542                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
543                 if (tmp & BCM43xx_PIO_RXCTL_READY)
544                         goto data_ready;
545                 udelay(10);
546         }
547         dprintkl(KERN_ERR PFX "PIO RX timed out\n");
548         return;
549 data_ready:
550
551         len = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
552         if (unlikely(len > 0x700)) {
553                 pio_rx_error(queue, 0, "len > 0x700");
554                 return;
555         }
556         if (unlikely(len == 0 && queue->mmio_base != BCM43xx_MMIO_PIO4_BASE)) {
557                 pio_rx_error(queue, 0, "len == 0");
558                 return;
559         }
560         preamble[0] = cpu_to_le16(len);
561         if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE)
562                 preamble_readwords = 14 / sizeof(u16);
563         else
564                 preamble_readwords = 18 / sizeof(u16);
565         for (i = 0; i < preamble_readwords; i++) {
566                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
567                 preamble[i + 1] = cpu_to_le16(tmp);
568         }
569         rxhdr = (struct bcm43xx_rxhdr *)preamble;
570         rxflags2 = le16_to_cpu(rxhdr->flags2);
571         if (unlikely(rxflags2 & BCM43xx_RXHDR_FLAGS2_INVALIDFRAME)) {
572                 pio_rx_error(queue,
573                              (queue->mmio_base == BCM43xx_MMIO_PIO1_BASE),
574                              "invalid frame");
575                 return;
576         }
577         if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE) {
578                 /* We received an xmit status. */
579                 struct bcm43xx_hwxmitstatus *hw;
580                 struct bcm43xx_xmitstatus stat;
581
582                 hw = (struct bcm43xx_hwxmitstatus *)(preamble + 1);
583                 stat.cookie = le16_to_cpu(hw->cookie);
584                 stat.flags = hw->flags;
585                 stat.cnt1 = hw->cnt1;
586                 stat.cnt2 = hw->cnt2;
587                 stat.seq = le16_to_cpu(hw->seq);
588                 stat.unknown = le16_to_cpu(hw->unknown);
589
590                 bcm43xx_debugfs_log_txstat(queue->bcm, &stat);
591                 bcm43xx_pio_handle_xmitstatus(queue->bcm, &stat);
592
593                 return;
594         }
595
596         skb = dev_alloc_skb(len);
597         if (unlikely(!skb)) {
598                 pio_rx_error(queue, 1, "OOM");
599                 return;
600         }
601         skb_put(skb, len);
602         for (i = 0; i < len - 1; i += 2) {
603                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
604                 *((u16 *)(skb->data + i)) = cpu_to_le16(tmp);
605         }
606         if (len % 2) {
607                 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
608                 skb->data[len - 1] = (tmp & 0x00FF);
609 /* The specs say the following is required, but
610  * it is wrong and corrupts the PLCP. If we don't do
611  * this, the PLCP seems to be correct. So ifdef it out for now.
612  */
613 #if 0
614                 if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME)
615                         skb->data[2] = (tmp & 0xFF00) >> 8;
616                 else
617                         skb->data[0] = (tmp & 0xFF00) >> 8;
618 #endif
619         }
620         skb_trim(skb, len - IEEE80211_FCS_LEN);
621         bcm43xx_rx(queue->bcm, skb, rxhdr);
622 }
623
624 void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
625 {
626         bcm43xx_power_saving_ctl_bits(queue->bcm, -1, 1);
627         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
628                           bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
629                           | BCM43xx_PIO_TXCTL_SUSPEND);
630 }
631
632 void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
633 {
634         bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
635                           bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
636                           & ~BCM43xx_PIO_TXCTL_SUSPEND);
637         bcm43xx_power_saving_ctl_bits(queue->bcm, -1, -1);
638         if (!list_empty(&queue->txqueue))
639                 tasklet_schedule(&queue->txtask);
640 }
641
642 void bcm43xx_pio_freeze_txqueues(struct bcm43xx_private *bcm)
643 {
644         struct bcm43xx_pio *pio;
645
646         assert(bcm43xx_using_pio(bcm));
647         pio = bcm43xx_current_pio(bcm);
648         pio->queue0->tx_frozen = 1;
649         pio->queue1->tx_frozen = 1;
650         pio->queue2->tx_frozen = 1;
651         pio->queue3->tx_frozen = 1;
652 }
653
654 void bcm43xx_pio_thaw_txqueues(struct bcm43xx_private *bcm)
655 {
656         struct bcm43xx_pio *pio;
657
658         assert(bcm43xx_using_pio(bcm));
659         pio = bcm43xx_current_pio(bcm);
660         pio->queue0->tx_frozen = 0;
661         pio->queue1->tx_frozen = 0;
662         pio->queue2->tx_frozen = 0;
663         pio->queue3->tx_frozen = 0;
664         if (!list_empty(&pio->queue0->txqueue))
665                 tasklet_schedule(&pio->queue0->txtask);
666         if (!list_empty(&pio->queue1->txqueue))
667                 tasklet_schedule(&pio->queue1->txtask);
668         if (!list_empty(&pio->queue2->txqueue))
669                 tasklet_schedule(&pio->queue2->txtask);
670         if (!list_empty(&pio->queue3->txqueue))
671                 tasklet_schedule(&pio->queue3->txtask);
672 }
673
674