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"
30 #include <linux/delay.h>
33 static void tx_start(struct bcm43xx_pioqueue *queue)
35 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
36 BCM43xx_PIO_TXCTL_INIT);
39 static void tx_octet(struct bcm43xx_pioqueue *queue,
42 if (queue->need_workarounds) {
43 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
45 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
46 BCM43xx_PIO_TXCTL_WRITEHI);
48 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
49 BCM43xx_PIO_TXCTL_WRITEHI);
50 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
55 static u16 tx_get_next_word(struct bcm43xx_txhdr *txhdr,
60 unsigned int i = *pos;
63 if (i < sizeof(*txhdr)) {
64 source = (const u8 *)txhdr;
69 ret = le16_to_cpu( *((u16 *)(source + i)) );
75 static void tx_data(struct bcm43xx_pioqueue *queue,
76 struct bcm43xx_txhdr *txhdr,
83 if (queue->need_workarounds) {
84 data = tx_get_next_word(txhdr, packet, &i);
85 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
87 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
88 BCM43xx_PIO_TXCTL_WRITELO |
89 BCM43xx_PIO_TXCTL_WRITEHI);
90 while (i < octets - 1) {
91 data = tx_get_next_word(txhdr, packet, &i);
92 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA, data);
95 tx_octet(queue, packet[octets - sizeof(*txhdr) - 1]);
98 static void tx_complete(struct bcm43xx_pioqueue *queue,
101 if (queue->need_workarounds) {
102 bcm43xx_pio_write(queue, BCM43xx_PIO_TXDATA,
103 skb->data[skb->len - 1]);
104 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
105 BCM43xx_PIO_TXCTL_WRITEHI |
106 BCM43xx_PIO_TXCTL_COMPLETE);
108 bcm43xx_pio_write(queue, BCM43xx_PIO_TXCTL,
109 BCM43xx_PIO_TXCTL_COMPLETE);
113 static u16 generate_cookie(struct bcm43xx_pioqueue *queue,
118 /* We use the upper 4 bits for the PIO
119 * controller ID and the lower 12 bits
120 * for the packet index (in the cache).
122 switch (queue->mmio_base) {
123 case BCM43xx_MMIO_PIO1_BASE:
125 case BCM43xx_MMIO_PIO2_BASE:
128 case BCM43xx_MMIO_PIO3_BASE:
131 case BCM43xx_MMIO_PIO4_BASE:
137 assert(((u16)packetindex & 0xF000) == 0x0000);
138 cookie |= (u16)packetindex;
144 struct bcm43xx_pioqueue * parse_cookie(struct bcm43xx_private *bcm,
146 struct bcm43xx_pio_txpacket **packet)
148 struct bcm43xx_pio *pio = bcm->current_core->pio;
149 struct bcm43xx_pioqueue *queue = NULL;
152 switch (cookie & 0xF000) {
168 packetindex = (cookie & 0x0FFF);
169 assert(packetindex >= 0 && packetindex < BCM43xx_PIO_MAXTXPACKETS);
170 *packet = &(queue->tx_packets_cache[packetindex]);
175 static void pio_tx_write_fragment(struct bcm43xx_pioqueue *queue,
177 struct bcm43xx_pio_txpacket *packet)
179 struct bcm43xx_txhdr txhdr;
182 assert(skb_shinfo(skb)->nr_frags == 0);
183 bcm43xx_generate_txhdr(queue->bcm,
184 &txhdr, skb->data, skb->len,
185 (packet->xmitted_frags == 0),
186 generate_cookie(queue, pio_txpacket_getindex(packet)));
189 octets = skb->len + sizeof(txhdr);
190 if (queue->need_workarounds)
192 tx_data(queue, &txhdr, (u8 *)skb->data, octets);
193 tx_complete(queue, skb);
196 static void free_txpacket(struct bcm43xx_pio_txpacket *packet,
199 struct bcm43xx_pioqueue *queue = packet->queue;
201 ieee80211_txb_free(packet->txb);
202 list_move(&packet->list, &queue->txfree);
205 assert(queue->tx_devq_used >= packet->xmitted_octets);
206 assert(queue->tx_devq_packets >= packet->xmitted_frags);
207 queue->tx_devq_used -= packet->xmitted_octets;
208 queue->tx_devq_packets -= packet->xmitted_frags;
211 static int pio_tx_packet(struct bcm43xx_pio_txpacket *packet)
213 struct bcm43xx_pioqueue *queue = packet->queue;
214 struct ieee80211_txb *txb = packet->txb;
219 for (i = packet->xmitted_frags; i < txb->nr_frags; i++) {
220 skb = txb->fragments[i];
222 octets = (u16)skb->len + sizeof(struct bcm43xx_txhdr);
223 assert(queue->tx_devq_size >= octets);
224 assert(queue->tx_devq_packets <= BCM43xx_PIO_MAXTXDEVQPACKETS);
225 assert(queue->tx_devq_used <= queue->tx_devq_size);
226 /* Check if there is sufficient free space on the device
227 * TX queue. If not, return and let the TX tasklet
230 if (queue->tx_devq_packets == BCM43xx_PIO_MAXTXDEVQPACKETS)
232 if (queue->tx_devq_used + octets > queue->tx_devq_size)
234 /* Now poke the device. */
235 pio_tx_write_fragment(queue, skb, packet);
237 /* Account for the packet size.
238 * (We must not overflow the device TX queue)
240 queue->tx_devq_packets++;
241 queue->tx_devq_used += octets;
243 assert(packet->xmitted_frags <= packet->txb->nr_frags);
244 packet->xmitted_frags++;
245 packet->xmitted_octets += octets;
247 list_move_tail(&packet->list, &queue->txrunning);
252 static void tx_tasklet(unsigned long d)
254 struct bcm43xx_pioqueue *queue = (struct bcm43xx_pioqueue *)d;
255 struct bcm43xx_private *bcm = queue->bcm;
257 struct bcm43xx_pio_txpacket *packet, *tmp_packet;
260 spin_lock_irqsave(&bcm->lock, flags);
261 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) {
262 assert(packet->xmitted_frags < packet->txb->nr_frags);
263 if (packet->xmitted_frags == 0) {
267 /* Check if the device queue is big
268 * enough for every fragment. If not, drop the
271 for (i = 0; i < packet->txb->nr_frags; i++) {
272 skb = packet->txb->fragments[i];
273 if (unlikely(skb->len > queue->tx_devq_size)) {
274 dprintkl(KERN_ERR PFX "PIO TX device queue too small. "
275 "Dropping packet.\n");
276 free_txpacket(packet, 1);
281 /* Try to transmit the packet.
282 * This may not completely succeed.
284 err = pio_tx_packet(packet);
290 spin_unlock_irqrestore(&bcm->lock, flags);
293 static void setup_txqueues(struct bcm43xx_pioqueue *queue)
295 struct bcm43xx_pio_txpacket *packet;
298 queue->nr_txfree = BCM43xx_PIO_MAXTXPACKETS;
299 for (i = 0; i < BCM43xx_PIO_MAXTXPACKETS; i++) {
300 packet = &(queue->tx_packets_cache[i]);
302 packet->queue = queue;
303 INIT_LIST_HEAD(&packet->list);
305 list_add(&packet->list, &queue->txfree);
310 struct bcm43xx_pioqueue * bcm43xx_setup_pioqueue(struct bcm43xx_private *bcm,
313 struct bcm43xx_pioqueue *queue;
317 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
322 queue->mmio_base = pio_mmio_base;
323 queue->need_workarounds = (bcm->current_core->rev < 3);
325 INIT_LIST_HEAD(&queue->txfree);
326 INIT_LIST_HEAD(&queue->txqueue);
327 INIT_LIST_HEAD(&queue->txrunning);
328 tasklet_init(&queue->txtask, tx_tasklet,
329 (unsigned long)queue);
331 value = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
332 value |= BCM43xx_SBF_XFER_REG_BYTESWAP;
333 bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, value);
335 qsize = bcm43xx_read16(bcm, queue->mmio_base + BCM43xx_PIO_TXQBUFSIZE);
336 if (qsize <= BCM43xx_PIO_TXQADJUST) {
337 printk(KERN_ERR PFX "PIO tx device-queue too small (%u)\n", qsize);
340 qsize -= BCM43xx_PIO_TXQADJUST;
341 queue->tx_devq_size = qsize;
343 setup_txqueues(queue);
354 static void cancel_transfers(struct bcm43xx_pioqueue *queue)
356 struct bcm43xx_pio_txpacket *packet, *tmp_packet;
358 netif_tx_disable(queue->bcm->net_dev);
359 assert(queue->bcm->shutting_down);
360 tasklet_disable(&queue->txtask);
362 list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list)
363 free_txpacket(packet, 0);
364 list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list)
365 free_txpacket(packet, 0);
368 static void bcm43xx_destroy_pioqueue(struct bcm43xx_pioqueue *queue)
373 cancel_transfers(queue);
377 void bcm43xx_pio_free(struct bcm43xx_private *bcm)
379 struct bcm43xx_pio *pio = bcm->current_core->pio;
381 bcm43xx_destroy_pioqueue(pio->queue3);
383 bcm43xx_destroy_pioqueue(pio->queue2);
385 bcm43xx_destroy_pioqueue(pio->queue1);
387 bcm43xx_destroy_pioqueue(pio->queue0);
391 int bcm43xx_pio_init(struct bcm43xx_private *bcm)
393 struct bcm43xx_pio *pio = bcm->current_core->pio;
394 struct bcm43xx_pioqueue *queue;
397 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO1_BASE);
402 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO2_BASE);
407 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO3_BASE);
412 queue = bcm43xx_setup_pioqueue(bcm, BCM43xx_MMIO_PIO4_BASE);
417 if (bcm->current_core->rev < 3)
418 bcm->irq_savedstate |= BCM43xx_IRQ_PIO_WORKAROUND;
420 dprintk(KERN_INFO PFX "PIO initialized\n");
426 bcm43xx_destroy_pioqueue(pio->queue2);
429 bcm43xx_destroy_pioqueue(pio->queue1);
432 bcm43xx_destroy_pioqueue(pio->queue0);
437 int bcm43xx_pio_tx(struct bcm43xx_private *bcm,
438 struct ieee80211_txb *txb)
440 struct bcm43xx_pioqueue *queue = bcm->current_core->pio->queue1;
441 struct bcm43xx_pio_txpacket *packet;
444 assert(!queue->tx_suspended);
445 assert(!list_empty(&queue->txfree));
447 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_TXCTL);
448 if (tmp & BCM43xx_PIO_TXCTL_SUSPEND)
451 packet = list_entry(queue->txfree.next, struct bcm43xx_pio_txpacket, list);
453 packet->xmitted_frags = 0;
454 packet->xmitted_octets = 0;
455 list_move_tail(&packet->list, &queue->txqueue);
457 assert(queue->nr_txfree < BCM43xx_PIO_MAXTXPACKETS);
459 /* Suspend TX, if we are out of packets in the "free" queue. */
460 if (unlikely(list_empty(&queue->txfree))) {
461 netif_stop_queue(queue->bcm->net_dev);
462 queue->tx_suspended = 1;
465 tasklet_schedule(&queue->txtask);
470 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private *bcm,
471 struct bcm43xx_xmitstatus *status)
473 struct bcm43xx_pioqueue *queue;
474 struct bcm43xx_pio_txpacket *packet;
476 queue = parse_cookie(bcm, status->cookie, &packet);
481 free_txpacket(packet, 1);
482 if (unlikely(queue->tx_suspended)) {
483 queue->tx_suspended = 0;
484 netif_wake_queue(queue->bcm->net_dev);
486 /* If there are packets on the txqueue, poke the tasklet. */
487 if (!list_empty(&queue->txqueue))
488 tasklet_schedule(&queue->txtask);
491 static void pio_rx_error(struct bcm43xx_pioqueue *queue,
497 printkl("PIO RX error: %s\n", error);
498 bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
499 BCM43xx_PIO_RXCTL_READY);
501 assert(queue->mmio_base == BCM43xx_MMIO_PIO1_BASE);
502 for (i = 0; i < 15; i++) {
504 bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
509 void bcm43xx_pio_rx(struct bcm43xx_pioqueue *queue)
511 u16 preamble[21] = { 0 };
512 struct bcm43xx_rxhdr *rxhdr;
513 u16 tmp, len, rxflags2;
514 int i, preamble_readwords;
518 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
519 if (!(tmp & BCM43xx_PIO_RXCTL_DATAAVAILABLE)) {
520 dprintkl(KERN_ERR PFX "PIO RX: No data available\n");//TODO: remove this printk.
523 bcm43xx_pio_write(queue, BCM43xx_PIO_RXCTL,
524 BCM43xx_PIO_RXCTL_DATAAVAILABLE);
526 for (i = 0; i < 10; i++) {
527 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXCTL);
528 if (tmp & BCM43xx_PIO_RXCTL_READY)
532 dprintkl(KERN_ERR PFX "PIO RX timed out\n");
536 //FIXME: endianess in this function.
537 len = le16_to_cpu(bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA));
538 if (unlikely(len > 0x700)) {
539 pio_rx_error(queue, 0, "len > 0x700");
542 if (unlikely(len == 0 && queue->mmio_base != BCM43xx_MMIO_PIO4_BASE)) {
543 pio_rx_error(queue, 0, "len == 0");
546 preamble[0] = cpu_to_le16(len);
547 if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE)
548 preamble_readwords = 14 / sizeof(u16);
550 preamble_readwords = 18 / sizeof(u16);
551 for (i = 0; i < preamble_readwords; i++) {
552 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
553 preamble[i + 1] = cpu_to_be16(tmp);//FIXME?
555 rxhdr = (struct bcm43xx_rxhdr *)preamble;
556 rxflags2 = le16_to_cpu(rxhdr->flags2);
557 if (unlikely(rxflags2 & BCM43xx_RXHDR_FLAGS2_INVALIDFRAME)) {
559 (queue->mmio_base == BCM43xx_MMIO_PIO1_BASE),
563 if (queue->mmio_base == BCM43xx_MMIO_PIO4_BASE) {
564 /* We received an xmit status. */
565 struct bcm43xx_hwxmitstatus *hw;
566 struct bcm43xx_xmitstatus stat;
568 hw = (struct bcm43xx_hwxmitstatus *)(preamble + 1);
569 stat.cookie = le16_to_cpu(hw->cookie);
570 stat.flags = hw->flags;
571 stat.cnt1 = hw->cnt1;
572 stat.cnt2 = hw->cnt2;
573 stat.seq = le16_to_cpu(hw->seq);
574 stat.unknown = le16_to_cpu(hw->unknown);
576 bcm43xx_debugfs_log_txstat(queue->bcm, &stat);
577 bcm43xx_pio_handle_xmitstatus(queue->bcm, &stat);
582 skb = dev_alloc_skb(len);
583 if (unlikely(!skb)) {
584 pio_rx_error(queue, 1, "OOM");
588 for (i = 0; i < len - 1; i += 2) {
589 tmp = cpu_to_be16(bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA));
590 *((u16 *)(skb->data + i)) = tmp;
593 tmp = bcm43xx_pio_read(queue, BCM43xx_PIO_RXDATA);
594 skb->data[len - 1] = (tmp & 0x00FF);
595 if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME)
596 skb->data[0x20] = (tmp & 0xFF00) >> 8;
598 skb->data[0x1E] = (tmp & 0xFF00) >> 8;
600 bcm43xx_rx(queue->bcm, skb, rxhdr);
603 /* vim: set ts=8 sw=8 sts=8: */