ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / drivers / net / wireless / b43legacy / pio.c
blobbcdd54eb2edb52683804712201f8ee78260c853b
1 /*
3 Broadcom B43legacy wireless driver
5 PIO Transmission
7 Copyright (c) 2005 Michael Buesch <mb@bu3sch.de>
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.
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.
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.
26 #include "b43legacy.h"
27 #include "pio.h"
28 #include "main.h"
29 #include "xmit.h"
31 #include <linux/delay.h>
34 static void tx_start(struct b43legacy_pioqueue *queue)
36 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
37 B43legacy_PIO_TXCTL_INIT);
40 static void tx_octet(struct b43legacy_pioqueue *queue,
41 u8 octet)
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);
54 static u16 tx_get_next_word(const u8 *txhdr,
55 const u8 *packet,
56 size_t txhdr_size,
57 unsigned int *pos)
59 const u8 *source;
60 unsigned int i = *pos;
61 u16 ret;
63 if (i < txhdr_size)
64 source = txhdr;
65 else {
66 source = packet;
67 i -= txhdr_size;
69 ret = le16_to_cpu(*((__le16 *)(source + i)));
70 *pos += 2;
72 return ret;
75 static void tx_data(struct b43legacy_pioqueue *queue,
76 u8 *txhdr,
77 const u8 *packet,
78 unsigned int octets)
80 u16 data;
81 unsigned int i = 0;
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);
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);
96 if (octets % 2)
97 tx_octet(queue, packet[octets -
98 sizeof(struct b43legacy_txhdr_fw3) - 1]);
101 static void tx_complete(struct b43legacy_pioqueue *queue,
102 struct sk_buff *skb)
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);
115 static u16 generate_cookie(struct b43legacy_pioqueue *queue,
116 struct b43legacy_pio_txpacket *packet)
118 u16 cookie = 0x0000;
119 int packetindex;
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).
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);
140 packetindex = pio_txpacket_getindex(packet);
141 B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));
142 cookie |= (u16)packetindex;
144 return cookie;
147 static
148 struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,
149 u16 cookie,
150 struct b43legacy_pio_txpacket **packet)
152 struct b43legacy_pio *pio = &dev->pio;
153 struct b43legacy_pioqueue *queue = NULL;
154 int packetindex;
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);
172 packetindex = (cookie & 0x0FFF);
173 B43legacy_WARN_ON(!(packetindex >= 0 && packetindex
174 < B43legacy_PIO_MAXTXPACKETS));
175 *packet = &(queue->tx_packets_cache[packetindex]);
177 return queue;
180 union txhdr_union {
181 struct b43legacy_txhdr_fw3 txhdr_fw3;
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)
189 union txhdr_union txhdr_data;
190 u8 *txhdr = NULL;
191 unsigned int octets;
192 int err;
194 txhdr = (u8 *)(&txhdr_data.txhdr_fw3);
196 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
197 err = b43legacy_generate_txhdr(queue->dev,
198 txhdr, skb->data, skb->len,
199 &packet->txstat.control,
200 generate_cookie(queue, packet));
201 if (err)
202 return err;
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);
211 return 0;
214 static void free_txpacket(struct b43legacy_pio_txpacket *packet,
215 int irq_context)
217 struct b43legacy_pioqueue *queue = packet->queue;
219 if (packet->skb) {
220 if (irq_context)
221 dev_kfree_skb_irq(packet->skb);
222 else
223 dev_kfree_skb(packet->skb);
225 list_move(&packet->list, &queue->txfree);
226 queue->nr_txfree++;
229 static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)
231 struct b43legacy_pioqueue *queue = packet->queue;
232 struct sk_buff *skb = packet->skb;
233 u16 octets;
234 int err;
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;
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.
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;
265 /* Account for the packet size.
266 * (We must not overflow the device TX queue)
268 queue->tx_devq_packets++;
269 queue->tx_devq_used += octets;
271 /* Transmission started, everything ok, move the
272 * packet to the txrunning list.
274 list_move_tail(&packet->list, &queue->txrunning);
276 return 0;
279 static void tx_tasklet(unsigned long d)
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;
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;
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.
303 err = pio_tx_packet(packet);
304 if (err)
305 break;
307 out_unlock:
308 spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
311 static void setup_txqueues(struct b43legacy_pioqueue *queue)
313 struct b43legacy_pio_txpacket *packet;
314 int i;
316 queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;
317 for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {
318 packet = &(queue->tx_packets_cache[i]);
320 packet->queue = queue;
321 INIT_LIST_HEAD(&packet->list);
323 list_add(&packet->list, &queue->txfree);
327 static
328 struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
329 u16 pio_mmio_base)
331 struct b43legacy_pioqueue *queue;
332 u32 value;
333 u16 qsize;
335 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
336 if (!queue)
337 goto out;
339 queue->dev = dev;
340 queue->mmio_base = pio_mmio_base;
341 queue->need_workarounds = (dev->dev->id.revision < 3);
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);
349 value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL);
350 value &= ~B43legacy_MACCTL_BE;
351 b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value);
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;
361 if (qsize <= B43legacy_PIO_TXQADJUST) {
362 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
363 qsize);
364 goto err_freequeue;
366 qsize -= B43legacy_PIO_TXQADJUST;
367 queue->tx_devq_size = qsize;
369 setup_txqueues(queue);
371 out:
372 return queue;
374 err_freequeue:
375 kfree(queue);
376 queue = NULL;
377 goto out;
380 static void cancel_transfers(struct b43legacy_pioqueue *queue)
382 struct b43legacy_pio_txpacket *packet, *tmp_packet;
384 tasklet_disable(&queue->txtask);
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);
392 static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)
394 if (!queue)
395 return;
397 cancel_transfers(queue);
398 kfree(queue);
401 void b43legacy_pio_free(struct b43legacy_wldev *dev)
403 struct b43legacy_pio *pio;
405 if (!b43legacy_using_pio(dev))
406 return;
407 pio = &dev->pio;
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;
419 int b43legacy_pio_init(struct b43legacy_wldev *dev)
421 struct b43legacy_pio *pio = &dev->pio;
422 struct b43legacy_pioqueue *queue;
423 int err = -ENOMEM;
425 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
426 if (!queue)
427 goto out;
428 pio->queue0 = queue;
430 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
431 if (!queue)
432 goto err_destroy0;
433 pio->queue1 = queue;
435 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
436 if (!queue)
437 goto err_destroy1;
438 pio->queue2 = queue;
440 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
441 if (!queue)
442 goto err_destroy2;
443 pio->queue3 = queue;
445 if (dev->dev->id.revision < 3)
446 dev->irq_savedstate |= B43legacy_IRQ_PIO_WORKAROUND;
448 b43legacydbg(dev->wl, "PIO initialized\n");
449 err = 0;
450 out:
451 return err;
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;
465 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
466 struct sk_buff *skb,
467 struct ieee80211_tx_control *ctl)
469 struct b43legacy_pioqueue *queue = dev->pio.queue1;
470 struct b43legacy_pio_txpacket *packet;
472 B43legacy_WARN_ON(queue->tx_suspended);
473 B43legacy_WARN_ON(list_empty(&queue->txfree));
475 packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
476 list);
477 packet->skb = skb;
479 memset(&packet->txstat, 0, sizeof(packet->txstat));
480 memcpy(&packet->txstat.control, ctl, sizeof(*ctl));
482 list_move_tail(&packet->list, &queue->txqueue);
483 queue->nr_txfree--;
484 queue->nr_tx_packets++;
485 B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);
487 tasklet_schedule(&queue->txtask);
489 return 0;
492 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
493 const struct b43legacy_txstatus *status)
495 struct b43legacy_pioqueue *queue;
496 struct b43legacy_pio_txpacket *packet;
498 queue = parse_cookie(dev, status->cookie, &packet);
499 B43legacy_WARN_ON(!queue);
501 if (!packet->skb)
502 return;
504 queue->tx_devq_packets--;
505 queue->tx_devq_used -= (packet->skb->len +
506 sizeof(struct b43legacy_txhdr_fw3));
508 if (status->acked)
509 packet->txstat.flags |= IEEE80211_TX_STATUS_ACK;
510 packet->txstat.retry_count = status->frame_count - 1;
511 ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb,
512 &(packet->txstat));
513 packet->skb = NULL;
515 free_txpacket(packet, 1);
516 /* If there are packets on the txqueue, poke the tasklet
517 * to transmit them.
519 if (!list_empty(&queue->txqueue))
520 tasklet_schedule(&queue->txtask);
523 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
524 struct ieee80211_tx_queue_stats *stats)
526 struct b43legacy_pio *pio = &dev->pio;
527 struct b43legacy_pioqueue *queue;
528 struct ieee80211_tx_queue_stats_data *data;
530 queue = pio->queue1;
531 data = &(stats->data[0]);
532 data->len = B43legacy_PIO_MAXTXPACKETS - queue->nr_txfree;
533 data->limit = B43legacy_PIO_MAXTXPACKETS;
534 data->count = queue->nr_tx_packets;
537 static void pio_rx_error(struct b43legacy_pioqueue *queue,
538 int clear_buffers,
539 const char *error)
541 int i;
543 b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
544 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
545 B43legacy_PIO_RXCTL_READY);
546 if (clear_buffers) {
547 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
548 for (i = 0; i < 15; i++) {
549 /* Dummy read. */
550 b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
555 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
557 __le16 preamble[21] = { 0 };
558 struct b43legacy_rxhdr_fw3 *rxhdr;
559 u16 tmp;
560 u16 len;
561 u16 macstat;
562 int i;
563 int preamble_readwords;
564 struct sk_buff *skb;
566 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
567 if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
568 return;
569 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
570 B43legacy_PIO_RXCTL_DATAAVAILABLE);
572 for (i = 0; i < 10; i++) {
573 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
574 if (tmp & B43legacy_PIO_RXCTL_READY)
575 goto data_ready;
576 udelay(10);
578 b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
579 return;
580 data_ready:
582 len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
583 if (unlikely(len > 0x700)) {
584 pio_rx_error(queue, 0, "len > 0x700");
585 return;
587 if (unlikely(len == 0 && queue->mmio_base !=
588 B43legacy_MMIO_PIO4_BASE)) {
589 pio_rx_error(queue, 0, "len == 0");
590 return;
592 preamble[0] = cpu_to_le16(len);
593 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
594 preamble_readwords = 14 / sizeof(u16);
595 else
596 preamble_readwords = 18 / sizeof(u16);
597 for (i = 0; i < preamble_readwords; i++) {
598 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
599 preamble[i + 1] = cpu_to_le16(tmp);
601 rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
602 macstat = le16_to_cpu(rxhdr->mac_status);
603 if (macstat & B43legacy_RX_MAC_FCSERR) {
604 pio_rx_error(queue,
605 (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
606 "Frame FCS error");
607 return;
609 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
610 /* We received an xmit status. */
611 struct b43legacy_hwtxstatus *hw;
613 hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
614 b43legacy_handle_hwtxstatus(queue->dev, hw);
616 return;
619 skb = dev_alloc_skb(len);
620 if (unlikely(!skb)) {
621 pio_rx_error(queue, 1, "OOM");
622 return;
624 skb_put(skb, len);
625 for (i = 0; i < len - 1; i += 2) {
626 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
627 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
629 if (len % 2) {
630 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
631 skb->data[len - 1] = (tmp & 0x00FF);
633 b43legacy_rx(queue->dev, skb, rxhdr);
636 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
638 b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
639 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
640 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
641 | B43legacy_PIO_TXCTL_SUSPEND);
644 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
646 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
647 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
648 & ~B43legacy_PIO_TXCTL_SUSPEND);
649 b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
650 tasklet_schedule(&queue->txtask);
653 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
655 struct b43legacy_pio *pio;
657 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
658 pio = &dev->pio;
659 pio->queue0->tx_frozen = 1;
660 pio->queue1->tx_frozen = 1;
661 pio->queue2->tx_frozen = 1;
662 pio->queue3->tx_frozen = 1;
665 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
667 struct b43legacy_pio *pio;
669 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
670 pio = &dev->pio;
671 pio->queue0->tx_frozen = 0;
672 pio->queue1->tx_frozen = 0;
673 pio->queue2->tx_frozen = 0;
674 pio->queue3->tx_frozen = 0;
675 if (!list_empty(&pio->queue0->txqueue))
676 tasklet_schedule(&pio->queue0->txtask);
677 if (!list_empty(&pio->queue1->txqueue))
678 tasklet_schedule(&pio->queue1->txtask);
679 if (!list_empty(&pio->queue2->txqueue))
680 tasklet_schedule(&pio->queue2->txtask);
681 if (!list_empty(&pio->queue3->txqueue))
682 tasklet_schedule(&pio->queue3->txtask);