3 Broadcom B43legacy wireless driver
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"
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,
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);
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,
60 unsigned int i = *pos;
69 ret = le16_to_cpu(*((__le16 *)(source + i)));
75 static void tx_data(struct b43legacy_pioqueue *queue,
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);
97 tx_octet(queue, packet[octets -
98 sizeof(struct b43legacy_txhdr_fw3) - 1]);
101 static void tx_complete(struct b43legacy_pioqueue *queue,
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);
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)
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:
128 case B43legacy_MMIO_PIO2_BASE:
131 case B43legacy_MMIO_PIO3_BASE:
134 case B43legacy_MMIO_PIO4_BASE:
138 B43legacy_WARN_ON(1);
140 packetindex = pio_txpacket_getindex(packet);
141 B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000));
142 cookie |= (u16)packetindex;
148 struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev,
150 struct b43legacy_pio_txpacket **packet)
152 struct b43legacy_pio *pio = &dev->pio;
153 struct b43legacy_pioqueue *queue = NULL;
156 switch (cookie & 0xF000) {
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]);
181 struct b43legacy_txhdr_fw3 txhdr_fw3;
184 static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue,
186 struct b43legacy_pio_txpacket *packet,
189 union txhdr_union txhdr_data;
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 IEEE80211_SKB_CB(skb),
200 generate_cookie(queue, packet));
205 octets = skb->len + txhdr_size;
206 if (queue->need_workarounds)
208 tx_data(queue, txhdr, (u8 *)skb->data, octets);
209 tx_complete(queue, skb);
214 static void free_txpacket(struct b43legacy_pio_txpacket *packet,
217 struct b43legacy_pioqueue *queue = packet->queue;
221 dev_kfree_skb_irq(packet->skb);
223 dev_kfree_skb(packet->skb);
225 list_move(&packet->list, &queue->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;
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);
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
251 if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)
253 if (queue->tx_devq_used + octets > queue->tx_devq_size)
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);
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);
279 static void tx_tasklet(unsigned long d)
281 struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d;
282 struct b43legacy_wldev *dev = queue->dev;
284 struct b43legacy_pio_txpacket *packet, *tmp_packet;
288 spin_lock_irqsave(&dev->wl->irq_lock, flags);
289 if (queue->tx_frozen)
291 txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);
292 if (txctl & B43legacy_PIO_TXCTL_SUSPEND)
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
303 err = pio_tx_packet(packet);
308 spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
311 static void setup_txqueues(struct b43legacy_pioqueue *queue)
313 struct b43legacy_pio_txpacket *packet;
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);
328 struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
331 struct b43legacy_pioqueue *queue;
335 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
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);
356 b43legacyerr(dev->wl, "This card does not support PIO "
357 "operation mode. Please use DMA mode "
358 "(module parameter pio=0).\n");
361 if (qsize <= B43legacy_PIO_TXQADJUST) {
362 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
366 qsize -= B43legacy_PIO_TXQADJUST;
367 queue->tx_devq_size = qsize;
369 setup_txqueues(queue);
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)
397 cancel_transfers(queue);
401 void b43legacy_pio_free(struct b43legacy_wldev *dev)
403 struct b43legacy_pio *pio;
405 if (!b43legacy_using_pio(dev))
409 b43legacy_destroy_pioqueue(pio->queue3);
411 b43legacy_destroy_pioqueue(pio->queue2);
413 b43legacy_destroy_pioqueue(pio->queue1);
415 b43legacy_destroy_pioqueue(pio->queue0);
419 int b43legacy_pio_init(struct b43legacy_wldev *dev)
421 struct b43legacy_pio *pio = &dev->pio;
422 struct b43legacy_pioqueue *queue;
425 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
430 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
435 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
440 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
445 if (dev->dev->id.revision < 3)
446 dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND;
448 b43legacydbg(dev->wl, "PIO initialized\n");
454 b43legacy_destroy_pioqueue(pio->queue2);
457 b43legacy_destroy_pioqueue(pio->queue1);
460 b43legacy_destroy_pioqueue(pio->queue0);
465 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
468 struct b43legacy_pioqueue *queue = dev->pio.queue1;
469 struct b43legacy_pio_txpacket *packet;
471 B43legacy_WARN_ON(queue->tx_suspended);
472 B43legacy_WARN_ON(list_empty(&queue->txfree));
474 packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
478 list_move_tail(&packet->list, &queue->txqueue);
480 B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);
482 tasklet_schedule(&queue->txtask);
487 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
488 const struct b43legacy_txstatus *status)
490 struct b43legacy_pioqueue *queue;
491 struct b43legacy_pio_txpacket *packet;
492 struct ieee80211_tx_info *info;
495 queue = parse_cookie(dev, status->cookie, &packet);
496 B43legacy_WARN_ON(!queue);
501 queue->tx_devq_packets--;
502 queue->tx_devq_used -= (packet->skb->len +
503 sizeof(struct b43legacy_txhdr_fw3));
505 info = IEEE80211_SKB_CB(packet->skb);
507 /* preserve the confiured retry limit before clearing the status
508 * The xmit function has overwritten the rc's value with the actual
509 * retry limit done by the hardware */
510 retry_limit = info->status.rates[0].count;
511 ieee80211_tx_info_clear_status(info);
514 info->flags |= IEEE80211_TX_STAT_ACK;
516 if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
518 * If the short retries (RTS, not data frame) have exceeded
519 * the limit, the hw will not have tried the selected rate,
520 * but will have used the fallback rate instead.
521 * Don't let the rate control count attempts for the selected
522 * rate in this case, otherwise the statistics will be off.
524 info->status.rates[0].count = 0;
525 info->status.rates[1].count = status->frame_count;
527 if (status->frame_count > retry_limit) {
528 info->status.rates[0].count = retry_limit;
529 info->status.rates[1].count = status->frame_count -
533 info->status.rates[0].count = status->frame_count;
534 info->status.rates[1].idx = -1;
537 ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb);
540 free_txpacket(packet, 1);
541 /* If there are packets on the txqueue, poke the tasklet
544 if (!list_empty(&queue->txqueue))
545 tasklet_schedule(&queue->txtask);
548 static void pio_rx_error(struct b43legacy_pioqueue *queue,
554 b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
555 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
556 B43legacy_PIO_RXCTL_READY);
558 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
559 for (i = 0; i < 15; i++) {
561 b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
566 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
568 __le16 preamble[21] = { 0 };
569 struct b43legacy_rxhdr_fw3 *rxhdr;
574 int preamble_readwords;
577 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
578 if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
580 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
581 B43legacy_PIO_RXCTL_DATAAVAILABLE);
583 for (i = 0; i < 10; i++) {
584 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
585 if (tmp & B43legacy_PIO_RXCTL_READY)
589 b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
593 len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
594 if (unlikely(len > 0x700)) {
595 pio_rx_error(queue, 0, "len > 0x700");
598 if (unlikely(len == 0 && queue->mmio_base !=
599 B43legacy_MMIO_PIO4_BASE)) {
600 pio_rx_error(queue, 0, "len == 0");
603 preamble[0] = cpu_to_le16(len);
604 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
605 preamble_readwords = 14 / sizeof(u16);
607 preamble_readwords = 18 / sizeof(u16);
608 for (i = 0; i < preamble_readwords; i++) {
609 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
610 preamble[i + 1] = cpu_to_le16(tmp);
612 rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
613 macstat = le16_to_cpu(rxhdr->mac_status);
614 if (macstat & B43legacy_RX_MAC_FCSERR) {
616 (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
620 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
621 /* We received an xmit status. */
622 struct b43legacy_hwtxstatus *hw;
624 hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
625 b43legacy_handle_hwtxstatus(queue->dev, hw);
630 skb = dev_alloc_skb(len);
631 if (unlikely(!skb)) {
632 pio_rx_error(queue, 1, "OOM");
636 for (i = 0; i < len - 1; i += 2) {
637 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
638 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
641 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
642 skb->data[len - 1] = (tmp & 0x00FF);
644 b43legacy_rx(queue->dev, skb, rxhdr);
647 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
649 b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
650 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
651 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
652 | B43legacy_PIO_TXCTL_SUSPEND);
655 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
657 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
658 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
659 & ~B43legacy_PIO_TXCTL_SUSPEND);
660 b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
661 tasklet_schedule(&queue->txtask);
664 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
666 struct b43legacy_pio *pio;
668 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
670 pio->queue0->tx_frozen = 1;
671 pio->queue1->tx_frozen = 1;
672 pio->queue2->tx_frozen = 1;
673 pio->queue3->tx_frozen = 1;
676 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
678 struct b43legacy_pio *pio;
680 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
682 pio->queue0->tx_frozen = 0;
683 pio->queue1->tx_frozen = 0;
684 pio->queue2->tx_frozen = 0;
685 pio->queue3->tx_frozen = 0;
686 if (!list_empty(&pio->queue0->txqueue))
687 tasklet_schedule(&pio->queue0->txtask);
688 if (!list_empty(&pio->queue1->txqueue))
689 tasklet_schedule(&pio->queue1->txtask);
690 if (!list_empty(&pio->queue2->txqueue))
691 tasklet_schedule(&pio->queue2->txtask);
692 if (!list_empty(&pio->queue3->txqueue))
693 tasklet_schedule(&pio->queue3->txtask);