3 Broadcom BCM43xx wireless driver
7 Copyright (c) 2005 Michael Buesch <mbuesch@freenet.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.
27 #include "bcm43xx_pio.h"
28 #include "bcm43xx_main.h"
29 #include "bcm43xx_xmit.h"
30 #include "bcm43xx_power.h"
32 #include <linux/delay.h>
35 static void tx_start(struct bcm43xx_pioqueue *queue)
37 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
38 BCM43xx_PIO_TXCTL_INIT);
41 static void tx_octet(struct bcm43xx_pioqueue *queue,
44 if (queue->need_workarounds) {
45 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
47 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
48 BCM43xx_PIO_TXCTL_WRITELO);
50 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
51 BCM43xx_PIO_TXCTL_WRITELO);
52 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
57 static u16 tx_get_next_word(struct bcm43xx_txhdr *txhdr,
62 unsigned int i = *pos;
65 if (i < sizeof(*txhdr)) {
66 source = (const u8 *)txhdr;
71 ret = le16_to_cpu( *((u16 *)(source + i)) );
77 static void tx_data(struct bcm43xx_pioqueue *queue,
78 struct bcm43xx_txhdr *txhdr,
85 if (queue->need_workarounds) {
86 data = tx_get_next_word(txhdr, packet, &i);
87 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
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);
97 tx_octet(queue, packet[octets - sizeof(*txhdr) - 1]);
100 static void tx_complete(struct bcm43xx_pioqueue *queue,
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);
110 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
111 BCM43xx_PIO_TXCTL_COMPLETE);
115 static u16 generate_cookie(struct bcm43xx_pioqueue *queue,
116 struct bcm43xx_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 BCM43xx_MMIO_PIO1_BASE:
128 case BCM43xx_MMIO_PIO2_BASE:
131 case BCM43xx_MMIO_PIO3_BASE:
134 case BCM43xx_MMIO_PIO4_BASE:
140 packetindex = pio_txpacket_getindex(packet);
141 assert(((u16)packetindex & 0xF000) == 0x0000);
142 cookie |= (u16)packetindex;
148 struct bcm43xx_pioqueue * parse_cookie(struct bcm43xx_private *bcm,
150 struct bcm43xx_pio_txpacket **packet)
152 struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
153 struct bcm43xx_pioqueue *queue = NULL;
156 switch (cookie & 0xF000) {
172 packetindex = (cookie & 0x0FFF);
173 assert(packetindex >= 0 && packetindex < BCM43xx_PIO_MAXTXPACKETS);
174 *packet = &(queue->tx_packets_cache[packetindex]);
179 static void pio_tx_write_fragment(struct bcm43xx_pioqueue *queue,
181 struct bcm43xx_pio_txpacket *packet)
183 struct bcm43xx_txhdr txhdr;
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));
193 octets = skb->len + sizeof(txhdr);
194 if (queue->need_workarounds)
196 tx_data(queue, &txhdr, (u8 *)skb->data, octets);
197 tx_complete(queue, skb);
200 static void free_txpacket(struct bcm43xx_pio_txpacket *packet,
203 struct bcm43xx_pioqueue *queue = packet->queue;
205 ieee80211_txb_free(packet->txb);
206 list_move(&packet->list, &queue->txfree);
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;
215 static int pio_tx_packet(struct bcm43xx_pio_txpacket *packet)
217 struct bcm43xx_pioqueue *queue = packet->queue;
218 struct ieee80211_txb *txb = packet->txb;
223 for (i = packet->xmitted_frags; i < txb->nr_frags; i++) {
224 skb = txb->fragments[i];
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
234 if (queue->tx_devq_packets == BCM43xx_PIO_MAXTXDEVQPACKETS)
236 if (queue->tx_devq_used + octets > queue->tx_devq_size)
238 /* Now poke the device. */
239 pio_tx_write_fragment(queue, skb, packet);
241 /* Account for the packet size.
242 * (We must not overflow the device TX queue)
244 queue->tx_devq_packets++;
245 queue->tx_devq_used += octets;
247 assert(packet->xmitted_frags < packet->txb->nr_frags);
248 packet->xmitted_frags++;
249 packet->xmitted_octets += octets;
251 list_move_tail(&packet->list, &queue->txrunning);
256 static void tx_tasklet(unsigned long d)
258 struct bcm43xx_pioqueue *queue = (struct bcm43xx_pioqueue *)d;
259 struct bcm43xx_private *bcm = queue->bcm;
261 struct bcm43xx_pio_txpacket *packet, *tmp_packet;
265 bcm43xx_lock_mmio(bcm, flags);
267 txctl = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
268 if (txctl & BCM43xx_PIO_TXCTL_SUSPEND)
271 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
272 assert(packet->xmitted_frags < packet->txb->nr_frags);
273 if (packet->xmitted_frags == 0) {
277 /* Check if the device queue is big
278 * enough for every fragment. If not, drop the
281 for (i = 0; i < packet->txb->nr_frags; i++) {
282 skb = packet->txb->fragments[i];
283 if (unlikely(skb->len > queue->tx_devq_size)) {
284 dprintkl(KERN_ERR PFX "PIO TX device queue too small. "
285 "Dropping packet.\n");
286 free_txpacket(packet, 1);
291 /* Try to transmit the packet.
292 * This may not completely succeed.
294 err = pio_tx_packet(packet);
301 bcm43xx_unlock_mmio(bcm, flags);
304 static void setup_txqueues(struct bcm43xx_pioqueue *queue)
306 struct bcm43xx_pio_txpacket *packet;
309 queue->nr_txfree = BCM43xx_PIO_MAXTXPACKETS;
310 for (i = 0; i < BCM43xx_PIO_MAXTXPACKETS; i++) {
311 packet = &(queue->tx_packets_cache[i]);
313 packet->queue = queue;
314 INIT_LIST_HEAD(&packet->list);
316 list_add(&packet->list, &queue->txfree);
321 struct bcm43xx_pioqueue * bcm43xx_setup_pioqueue(struct bcm43xx_private *bcm,
324 struct bcm43xx_pioqueue *queue;
328 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
333 queue->mmio_base = pio_mmio_base;
334 queue->need_workarounds = (bcm->current_core->rev < 3);
336 INIT_LIST_HEAD(&queue->txfree);
337 INIT_LIST_HEAD(&queue->txqueue);
338 INIT_LIST_HEAD(&queue->txrunning);
339 tasklet_init(&queue->txtask, tx_tasklet,
340 (unsigned long)queue);
342 value = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
343 value &= ~BCM43xx_SBF_XFER_REG_BYTESWAP;
344 bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, value);
346 qsize = bcm43xx_read16(bcm, queue->mmio_base + BCM43xx_PIO_TXQBUFSIZE);
348 printk(KERN_ERR PFX "ERROR: This card does not support PIO "
349 "operation mode. Please use DMA mode "
350 "(module parameter pio=0).\n");
353 if (qsize <= BCM43xx_PIO_TXQADJUST) {
354 printk(KERN_ERR PFX "PIO tx device-queue too small (%u)\n",
358 qsize -= BCM43xx_PIO_TXQADJUST;
359 queue->tx_devq_size = qsize;
361 setup_txqueues(queue);
372 static void cancel_transfers(struct bcm43xx_pioqueue *queue)
374 struct bcm43xx_pio_txpacket *packet, *tmp_packet;
376 netif_tx_disable(queue->bcm->net_dev);
377 assert(queue->bcm->shutting_down);
378 tasklet_disable(&queue->txtask);
380 list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
381 free_txpacket(packet, 0);
382 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
383 free_txpacket(packet, 0);
386 static void bcm43xx_destroy_pioqueue(struct bcm43xx_pioqueue *queue)
391 cancel_transfers(queue);
395 void bcm43xx_pio_free(struct bcm43xx_private *bcm)
397 struct bcm43xx_pio *pio;
399 if (!bcm43xx_using_pio(bcm))
401 pio = bcm43xx_current_pio(bcm);
403 bcm43xx_destroy_pioqueue(pio->queue3);
405 bcm43xx_destroy_pioqueue(pio->queue2);
407 bcm43xx_destroy_pioqueue(pio->queue1);
409 bcm43xx_destroy_pioqueue(pio->queue0);
413 int bcm43xx_pio_init(struct bcm43xx_private *bcm)
415 struct bcm43xx_pio *pio = bcm43xx_current_pio(bcm);
416 struct bcm43xx_pioqueue *queue;
419 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO1_BASE);
424 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO2_BASE);
429 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO3_BASE);
434 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO4_BASE);
439 if (bcm->current_core->rev < 3)
440 bcm->irq_savedstate |= BCM43xx_IRQ_PIO_WORKAROUND;
442 dprintk(KERN_INFO PFX "PIO initialized\n");
448 bcm43xx_destroy_pioqueue(pio->queue2);
451 bcm43xx_destroy_pioqueue(pio->queue1);
454 bcm43xx_destroy_pioqueue(pio->queue0);
459 int bcm43xx_pio_tx(struct bcm43xx_private *bcm,
460 struct ieee80211_txb *txb)
462 struct bcm43xx_pioqueue *queue = bcm43xx_current_pio(bcm)->queue1;
463 struct bcm43xx_pio_txpacket *packet;
465 assert(!queue->tx_suspended);
466 assert(!list_empty(&queue->txfree));
468 packet = list_entry(queue->txfree.next, struct bcm43xx_pio_txpacket, list);
470 packet->xmitted_frags = 0;
471 packet->xmitted_octets = 0;
472 list_move_tail(&packet->list, &queue->txqueue);
474 assert(queue->nr_txfree < BCM43xx_PIO_MAXTXPACKETS);
476 /* Suspend TX, if we are out of packets in the "free" queue. */
477 if (list_empty(&queue->txfree)) {
478 netif_stop_queue(queue->bcm->net_dev);
479 queue->tx_suspended = 1;
482 tasklet_schedule(&queue->txtask);
487 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private *bcm,
488 struct bcm43xx_xmitstatus *status)
490 struct bcm43xx_pioqueue *queue;
491 struct bcm43xx_pio_txpacket *packet;
493 queue = parse_cookie(bcm, status->cookie, &packet);
496 free_txpacket(packet, 1);
497 if (queue->tx_suspended) {
498 queue->tx_suspended = 0;
499 netif_wake_queue(queue->bcm->net_dev);
501 /* If there are packets on the txqueue, poke the tasklet
504 if (!list_empty(&queue->txqueue))
505 tasklet_schedule(&queue->txtask);
508 static void pio_rx_error(struct bcm43xx_pioqueue *queue,
514 printkl("PIO RX error: %s\n", error);
515 bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
516 BCM43xx_PIO_RXCTL_READY);
518 assert(queue->mmio_base == BCM43xx_MMIO_PIO1_BASE);
519 for (i = 0; i < 15; i++) {
521 bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
526 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
528 u16 preamble[21] = { 0 };
529 struct bcm43xx_rxhdr *rxhdr;
530 u16 tmp, len, rxflags2;
531 int i, preamble_readwords;
534 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
535 if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE))
537 bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
538 BCM43xx_PIO_RXCTL_DATAAVAILABLE);
540 for (i = 0; i < 10; i++) {
541 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
542 if (tmp & BCM43xx_PIO_RXCTL_READY)
546 dprintkl(KERN_ERR PFX "PIO RX timed out\n");
550 len = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
551 if (unlikely(len > 0x700)) {
552 pio_rx_error(queue, 0, "len > 0x700");
555 if (unlikely(len == 0 && queue->mmio_base != BCM43xx_MMIO_PIO4_BASE)) {
556 pio_rx_error(queue, 0, "len == 0");
559 preamble[0] = cpu_to_le16(len);
560 if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE)
561 preamble_readwords = 14 / sizeof(u16);
563 preamble_readwords = 18 / sizeof(u16);
564 for (i = 0; i < preamble_readwords; i++) {
565 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
566 preamble[i + 1] = cpu_to_le16(tmp);
568 rxhdr = (struct bcm43xx_rxhdr *)preamble;
569 rxflags2 = le16_to_cpu(rxhdr->flags2);
570 if (unlikely(rxflags2 & BCM43xx_RXHDR_FLAGS2_INVALIDFRAME)) {
572 (queue->mmio_base == BCM43xx_MMIO_PIO1_BASE),
576 if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE) {
577 /* We received an xmit status. */
578 struct bcm43xx_hwxmitstatus *hw;
579 struct bcm43xx_xmitstatus stat;
581 hw = (struct bcm43xx_hwxmitstatus *)(preamble + 1);
582 stat.cookie = le16_to_cpu(hw->cookie);
583 stat.flags = hw->flags;
584 stat.cnt1 = hw->cnt1;
585 stat.cnt2 = hw->cnt2;
586 stat.seq = le16_to_cpu(hw->seq);
587 stat.unknown = le16_to_cpu(hw->unknown);
589 bcm43xx_debugfs_log_txstat(queue->bcm, &stat);
590 bcm43xx_pio_handle_xmitstatus(queue->bcm, &stat);
595 skb = dev_alloc_skb(len);
596 if (unlikely(!skb)) {
597 pio_rx_error(queue, 1, "OOM");
601 for (i = 0; i < len - 1; i += 2) {
602 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
603 *((u16 *)(skb->data + i)) = cpu_to_le16(tmp);
606 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
607 skb->data[len - 1] = (tmp & 0x00FF);
608 /* The specs say the following is required, but
609 * it is wrong and corrupts the PLCP. If we don't do
610 * this, the PLCP seems to be correct. So ifdef it out for now.
613 if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME)
614 skb->data[2] = (tmp & 0xFF00) >> 8;
616 skb->data[0] = (tmp & 0xFF00) >> 8;
619 skb_trim(skb, len - IEEE80211_FCS_LEN);
620 bcm43xx_rx(queue->bcm, skb, rxhdr);
623 void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue *queue)
625 bcm43xx_power_saving_ctl_bits(queue->bcm, -1, 1);
626 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
627 bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
628 | BCM43xx_PIO_TXCTL_SUSPEND);
631 void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue *queue)
633 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
634 bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL)
635 & ~BCM43xx_PIO_TXCTL_SUSPEND);
636 bcm43xx_power_saving_ctl_bits(queue->bcm, -1, -1);
637 tasklet_schedule(&queue->txtask);