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 void pio_tx_write_fragment(struct b43legacy_pioqueue *queue,
186 struct b43legacy_pio_txpacket *packet,
189 union txhdr_union txhdr_data;
193 txhdr = (u8 *)(&txhdr_data.txhdr_fw3);
195 B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0);
196 b43legacy_generate_txhdr(queue->dev,
197 txhdr, skb->data, skb->len,
198 &packet->txstat.control,
199 generate_cookie(queue, packet));
202 octets = skb->len + txhdr_size;
203 if (queue->need_workarounds)
205 tx_data(queue, txhdr, (u8 *)skb->data, octets);
206 tx_complete(queue, skb);
209 static void free_txpacket(struct b43legacy_pio_txpacket *packet,
212 struct b43legacy_pioqueue *queue = packet->queue;
216 dev_kfree_skb_irq(packet->skb);
218 dev_kfree_skb(packet->skb);
220 list_move(&packet->list, &queue->txfree);
224 static int pio_tx_packet(struct b43legacy_pio_txpacket *packet)
226 struct b43legacy_pioqueue *queue = packet->queue;
227 struct sk_buff *skb = packet->skb;
230 octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3);
231 if (queue->tx_devq_size < octets) {
232 b43legacywarn(queue->dev->wl, "PIO queue too small. "
233 "Dropping packet.\n");
234 /* Drop it silently (return success) */
235 free_txpacket(packet, 1);
238 B43legacy_WARN_ON(queue->tx_devq_packets >
239 B43legacy_PIO_MAXTXDEVQPACKETS);
240 B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size);
241 /* Check if there is sufficient free space on the device
242 * TX queue. If not, return and let the TX tasklet
245 if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS)
247 if (queue->tx_devq_used + octets > queue->tx_devq_size)
249 /* Now poke the device. */
250 pio_tx_write_fragment(queue, skb, packet,
251 sizeof(struct b43legacy_txhdr_fw3));
253 /* Account for the packet size.
254 * (We must not overflow the device TX queue)
256 queue->tx_devq_packets++;
257 queue->tx_devq_used += octets;
259 /* Transmission started, everything ok, move the
260 * packet to the txrunning list.
262 list_move_tail(&packet->list, &queue->txrunning);
267 static void tx_tasklet(unsigned long d)
269 struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d;
270 struct b43legacy_wldev *dev = queue->dev;
272 struct b43legacy_pio_txpacket *packet, *tmp_packet;
276 spin_lock_irqsave(&dev->wl->irq_lock, flags);
277 if (queue->tx_frozen)
279 txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL);
280 if (txctl & B43legacy_PIO_TXCTL_SUSPEND)
283 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
284 /* Try to transmit the packet. This can fail, if
285 * the device queue is full. In case of failure, the
286 * packet is left in the txqueue.
287 * If transmission succeed, the packet is moved to txrunning.
288 * If it is impossible to transmit the packet, it
291 err = pio_tx_packet(packet);
296 spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
299 static void setup_txqueues(struct b43legacy_pioqueue *queue)
301 struct b43legacy_pio_txpacket *packet;
304 queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS;
305 for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) {
306 packet = &(queue->tx_packets_cache[i]);
308 packet->queue = queue;
309 INIT_LIST_HEAD(&packet->list);
311 list_add(&packet->list, &queue->txfree);
316 struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev,
319 struct b43legacy_pioqueue *queue;
323 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
328 queue->mmio_base = pio_mmio_base;
329 queue->need_workarounds = (dev->dev->id.revision < 3);
331 INIT_LIST_HEAD(&queue->txfree);
332 INIT_LIST_HEAD(&queue->txqueue);
333 INIT_LIST_HEAD(&queue->txrunning);
334 tasklet_init(&queue->txtask, tx_tasklet,
335 (unsigned long)queue);
337 value = b43legacy_read32(dev, B43legacy_MMIO_STATUS_BITFIELD);
338 value &= ~B43legacy_SBF_XFER_REG_BYTESWAP;
339 b43legacy_write32(dev, B43legacy_MMIO_STATUS_BITFIELD, value);
341 qsize = b43legacy_read16(dev, queue->mmio_base
342 + B43legacy_PIO_TXQBUFSIZE);
344 b43legacyerr(dev->wl, "This card does not support PIO "
345 "operation mode. Please use DMA mode "
346 "(module parameter pio=0).\n");
349 if (qsize <= B43legacy_PIO_TXQADJUST) {
350 b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n",
354 qsize -= B43legacy_PIO_TXQADJUST;
355 queue->tx_devq_size = qsize;
357 setup_txqueues(queue);
368 static void cancel_transfers(struct b43legacy_pioqueue *queue)
370 struct b43legacy_pio_txpacket *packet, *tmp_packet;
372 tasklet_disable(&queue->txtask);
374 list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
375 free_txpacket(packet, 0);
376 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
377 free_txpacket(packet, 0);
380 static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue)
385 cancel_transfers(queue);
389 void b43legacy_pio_free(struct b43legacy_wldev *dev)
391 struct b43legacy_pio *pio;
393 if (!b43legacy_using_pio(dev))
397 b43legacy_destroy_pioqueue(pio->queue3);
399 b43legacy_destroy_pioqueue(pio->queue2);
401 b43legacy_destroy_pioqueue(pio->queue1);
403 b43legacy_destroy_pioqueue(pio->queue0);
407 int b43legacy_pio_init(struct b43legacy_wldev *dev)
409 struct b43legacy_pio *pio = &dev->pio;
410 struct b43legacy_pioqueue *queue;
413 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE);
418 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE);
423 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE);
428 queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE);
433 if (dev->dev->id.revision < 3)
434 dev->irq_savedstate |= B43legacy_IRQ_PIO_WORKAROUND;
436 b43legacydbg(dev->wl, "PIO initialized\n");
442 b43legacy_destroy_pioqueue(pio->queue2);
445 b43legacy_destroy_pioqueue(pio->queue1);
448 b43legacy_destroy_pioqueue(pio->queue0);
453 int b43legacy_pio_tx(struct b43legacy_wldev *dev,
455 struct ieee80211_tx_control *ctl)
457 struct b43legacy_pioqueue *queue = dev->pio.queue1;
458 struct b43legacy_pio_txpacket *packet;
460 B43legacy_WARN_ON(queue->tx_suspended);
461 B43legacy_WARN_ON(list_empty(&queue->txfree));
463 packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket,
467 memset(&packet->txstat, 0, sizeof(packet->txstat));
468 memcpy(&packet->txstat.control, ctl, sizeof(*ctl));
470 list_move_tail(&packet->list, &queue->txqueue);
472 queue->nr_tx_packets++;
473 B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS);
475 tasklet_schedule(&queue->txtask);
480 void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev,
481 const struct b43legacy_txstatus *status)
483 struct b43legacy_pioqueue *queue;
484 struct b43legacy_pio_txpacket *packet;
486 queue = parse_cookie(dev, status->cookie, &packet);
487 B43legacy_WARN_ON(!queue);
489 queue->tx_devq_packets--;
490 queue->tx_devq_used -= (packet->skb->len +
491 sizeof(struct b43legacy_txhdr_fw3));
494 packet->txstat.flags |= IEEE80211_TX_STATUS_ACK;
495 packet->txstat.retry_count = status->frame_count - 1;
496 ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb,
500 free_txpacket(packet, 1);
501 /* If there are packets on the txqueue, poke the tasklet
504 if (!list_empty(&queue->txqueue))
505 tasklet_schedule(&queue->txtask);
508 void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev,
509 struct ieee80211_tx_queue_stats *stats)
511 struct b43legacy_pio *pio = &dev->pio;
512 struct b43legacy_pioqueue *queue;
513 struct ieee80211_tx_queue_stats_data *data;
516 data = &(stats->data[0]);
517 data->len = B43legacy_PIO_MAXTXPACKETS - queue->nr_txfree;
518 data->limit = B43legacy_PIO_MAXTXPACKETS;
519 data->count = queue->nr_tx_packets;
522 static void pio_rx_error(struct b43legacy_pioqueue *queue,
528 b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error);
529 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
530 B43legacy_PIO_RXCTL_READY);
532 B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE);
533 for (i = 0; i < 15; i++) {
535 b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
540 void b43legacy_pio_rx(struct b43legacy_pioqueue *queue)
542 __le16 preamble[21] = { 0 };
543 struct b43legacy_rxhdr_fw3 *rxhdr;
548 int preamble_readwords;
551 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
552 if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE))
554 b43legacy_pio_write(queue, B43legacy_PIO_RXCTL,
555 B43legacy_PIO_RXCTL_DATAAVAILABLE);
557 for (i = 0; i < 10; i++) {
558 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL);
559 if (tmp & B43legacy_PIO_RXCTL_READY)
563 b43legacydbg(queue->dev->wl, "PIO RX timed out\n");
567 len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
568 if (unlikely(len > 0x700)) {
569 pio_rx_error(queue, 0, "len > 0x700");
572 if (unlikely(len == 0 && queue->mmio_base !=
573 B43legacy_MMIO_PIO4_BASE)) {
574 pio_rx_error(queue, 0, "len == 0");
577 preamble[0] = cpu_to_le16(len);
578 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE)
579 preamble_readwords = 14 / sizeof(u16);
581 preamble_readwords = 18 / sizeof(u16);
582 for (i = 0; i < preamble_readwords; i++) {
583 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
584 preamble[i + 1] = cpu_to_le16(tmp);
586 rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble;
587 macstat = le16_to_cpu(rxhdr->mac_status);
588 if (macstat & B43legacy_RX_MAC_FCSERR) {
590 (queue->mmio_base == B43legacy_MMIO_PIO1_BASE),
594 if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) {
595 /* We received an xmit status. */
596 struct b43legacy_hwtxstatus *hw;
598 hw = (struct b43legacy_hwtxstatus *)(preamble + 1);
599 b43legacy_handle_hwtxstatus(queue->dev, hw);
604 skb = dev_alloc_skb(len);
605 if (unlikely(!skb)) {
606 pio_rx_error(queue, 1, "OOM");
610 for (i = 0; i < len - 1; i += 2) {
611 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
612 *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp);
615 tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA);
616 skb->data[len - 1] = (tmp & 0x00FF);
618 b43legacy_rx(queue->dev, skb, rxhdr);
621 void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue)
623 b43legacy_power_saving_ctl_bits(queue->dev, -1, 1);
624 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
625 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
626 | B43legacy_PIO_TXCTL_SUSPEND);
629 void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue)
631 b43legacy_pio_write(queue, B43legacy_PIO_TXCTL,
632 b43legacy_pio_read(queue, B43legacy_PIO_TXCTL)
633 & ~B43legacy_PIO_TXCTL_SUSPEND);
634 b43legacy_power_saving_ctl_bits(queue->dev, -1, -1);
635 tasklet_schedule(&queue->txtask);
638 void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev)
640 struct b43legacy_pio *pio;
642 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
644 pio->queue0->tx_frozen = 1;
645 pio->queue1->tx_frozen = 1;
646 pio->queue2->tx_frozen = 1;
647 pio->queue3->tx_frozen = 1;
650 void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev)
652 struct b43legacy_pio *pio;
654 B43legacy_WARN_ON(!b43legacy_using_pio(dev));
656 pio->queue0->tx_frozen = 0;
657 pio->queue1->tx_frozen = 0;
658 pio->queue2->tx_frozen = 0;
659 pio->queue3->tx_frozen = 0;
660 if (!list_empty(&pio->queue0->txqueue))
661 tasklet_schedule(&pio->queue0->txtask);
662 if (!list_empty(&pio->queue1->txqueue))
663 tasklet_schedule(&pio->queue1->txtask);
664 if (!list_empty(&pio->queue2->txqueue))
665 tasklet_schedule(&pio->queue2->txtask);
666 if (!list_empty(&pio->queue3->txqueue))
667 tasklet_schedule(&pio->queue3->txtask);