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 spin_lock_irqsave(&bcm
->irq_lock
, flags
);
267 if (queue
->tx_frozen
)
269 txctl
= bcm43xx_pio_read(queue
, BCM43xx_PIO_TXCTL
);
270 if (txctl
& BCM43xx_PIO_TXCTL_SUSPEND
)
273 list_for_each_entry_safe(packet
, tmp_packet
, &queue
->txqueue
, list
) {
274 assert(packet
->xmitted_frags
< packet
->txb
->nr_frags
);
275 if (packet
->xmitted_frags
== 0) {
279 /* Check if the device queue is big
280 * enough for every fragment. If not, drop the
283 for (i
= 0; i
< packet
->txb
->nr_frags
; i
++) {
284 skb
= packet
->txb
->fragments
[i
];
285 if (unlikely(skb
->len
> queue
->tx_devq_size
)) {
286 dprintkl(KERN_ERR PFX
"PIO TX device queue too small. "
287 "Dropping packet.\n");
288 free_txpacket(packet
, 1);
293 /* Try to transmit the packet.
294 * This may not completely succeed.
296 err
= pio_tx_packet(packet
);
303 spin_unlock_irqrestore(&bcm
->irq_lock
, flags
);
306 static void setup_txqueues(struct bcm43xx_pioqueue
*queue
)
308 struct bcm43xx_pio_txpacket
*packet
;
311 queue
->nr_txfree
= BCM43xx_PIO_MAXTXPACKETS
;
312 for (i
= 0; i
< BCM43xx_PIO_MAXTXPACKETS
; i
++) {
313 packet
= &(queue
->tx_packets_cache
[i
]);
315 packet
->queue
= queue
;
316 INIT_LIST_HEAD(&packet
->list
);
318 list_add(&packet
->list
, &queue
->txfree
);
323 struct bcm43xx_pioqueue
* bcm43xx_setup_pioqueue(struct bcm43xx_private
*bcm
,
326 struct bcm43xx_pioqueue
*queue
;
330 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
335 queue
->mmio_base
= pio_mmio_base
;
336 queue
->need_workarounds
= (bcm
->current_core
->rev
< 3);
338 INIT_LIST_HEAD(&queue
->txfree
);
339 INIT_LIST_HEAD(&queue
->txqueue
);
340 INIT_LIST_HEAD(&queue
->txrunning
);
341 tasklet_init(&queue
->txtask
, tx_tasklet
,
342 (unsigned long)queue
);
344 value
= bcm43xx_read32(bcm
, BCM43xx_MMIO_STATUS_BITFIELD
);
345 value
&= ~BCM43xx_SBF_XFER_REG_BYTESWAP
;
346 bcm43xx_write32(bcm
, BCM43xx_MMIO_STATUS_BITFIELD
, value
);
348 qsize
= bcm43xx_read16(bcm
, queue
->mmio_base
+ BCM43xx_PIO_TXQBUFSIZE
);
350 printk(KERN_ERR PFX
"ERROR: This card does not support PIO "
351 "operation mode. Please use DMA mode "
352 "(module parameter pio=0).\n");
355 if (qsize
<= BCM43xx_PIO_TXQADJUST
) {
356 printk(KERN_ERR PFX
"PIO tx device-queue too small (%u)\n",
360 qsize
-= BCM43xx_PIO_TXQADJUST
;
361 queue
->tx_devq_size
= qsize
;
363 setup_txqueues(queue
);
374 static void cancel_transfers(struct bcm43xx_pioqueue
*queue
)
376 struct bcm43xx_pio_txpacket
*packet
, *tmp_packet
;
378 netif_tx_disable(queue
->bcm
->net_dev
);
379 tasklet_disable(&queue
->txtask
);
381 list_for_each_entry_safe(packet
, tmp_packet
, &queue
->txrunning
, list
)
382 free_txpacket(packet
, 0);
383 list_for_each_entry_safe(packet
, tmp_packet
, &queue
->txqueue
, list
)
384 free_txpacket(packet
, 0);
387 static void bcm43xx_destroy_pioqueue(struct bcm43xx_pioqueue
*queue
)
392 cancel_transfers(queue
);
396 void bcm43xx_pio_free(struct bcm43xx_private
*bcm
)
398 struct bcm43xx_pio
*pio
;
400 if (!bcm43xx_using_pio(bcm
))
402 pio
= bcm43xx_current_pio(bcm
);
404 bcm43xx_destroy_pioqueue(pio
->queue3
);
406 bcm43xx_destroy_pioqueue(pio
->queue2
);
408 bcm43xx_destroy_pioqueue(pio
->queue1
);
410 bcm43xx_destroy_pioqueue(pio
->queue0
);
414 int bcm43xx_pio_init(struct bcm43xx_private
*bcm
)
416 struct bcm43xx_pio
*pio
= bcm43xx_current_pio(bcm
);
417 struct bcm43xx_pioqueue
*queue
;
420 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO1_BASE
);
425 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO2_BASE
);
430 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO3_BASE
);
435 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO4_BASE
);
440 if (bcm
->current_core
->rev
< 3)
441 bcm
->irq_savedstate
|= BCM43xx_IRQ_PIO_WORKAROUND
;
443 dprintk(KERN_INFO PFX
"PIO initialized\n");
449 bcm43xx_destroy_pioqueue(pio
->queue2
);
452 bcm43xx_destroy_pioqueue(pio
->queue1
);
455 bcm43xx_destroy_pioqueue(pio
->queue0
);
460 int bcm43xx_pio_tx(struct bcm43xx_private
*bcm
,
461 struct ieee80211_txb
*txb
)
463 struct bcm43xx_pioqueue
*queue
= bcm43xx_current_pio(bcm
)->queue1
;
464 struct bcm43xx_pio_txpacket
*packet
;
466 assert(!queue
->tx_suspended
);
467 assert(!list_empty(&queue
->txfree
));
469 packet
= list_entry(queue
->txfree
.next
, struct bcm43xx_pio_txpacket
, list
);
471 packet
->xmitted_frags
= 0;
472 packet
->xmitted_octets
= 0;
473 list_move_tail(&packet
->list
, &queue
->txqueue
);
475 assert(queue
->nr_txfree
< BCM43xx_PIO_MAXTXPACKETS
);
477 /* Suspend TX, if we are out of packets in the "free" queue. */
478 if (list_empty(&queue
->txfree
)) {
479 netif_stop_queue(queue
->bcm
->net_dev
);
480 queue
->tx_suspended
= 1;
483 tasklet_schedule(&queue
->txtask
);
488 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private
*bcm
,
489 struct bcm43xx_xmitstatus
*status
)
491 struct bcm43xx_pioqueue
*queue
;
492 struct bcm43xx_pio_txpacket
*packet
;
494 queue
= parse_cookie(bcm
, status
->cookie
, &packet
);
497 free_txpacket(packet
, 1);
498 if (queue
->tx_suspended
) {
499 queue
->tx_suspended
= 0;
500 netif_wake_queue(queue
->bcm
->net_dev
);
502 /* If there are packets on the txqueue, poke the tasklet
505 if (!list_empty(&queue
->txqueue
))
506 tasklet_schedule(&queue
->txtask
);
509 static void pio_rx_error(struct bcm43xx_pioqueue
*queue
,
515 printkl("PIO RX error: %s\n", error
);
516 bcm43xx_pio_write(queue
, BCM43xx_PIO_RXCTL
,
517 BCM43xx_PIO_RXCTL_READY
);
519 assert(queue
->mmio_base
== BCM43xx_MMIO_PIO1_BASE
);
520 for (i
= 0; i
< 15; i
++) {
522 bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
527 void bcm43xx_pio_rx(struct bcm43xx_pioqueue
*queue
)
529 u16 preamble
[21] = { 0 };
530 struct bcm43xx_rxhdr
*rxhdr
;
531 u16 tmp
, len
, rxflags2
;
532 int i
, preamble_readwords
;
535 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXCTL
);
536 if (!(tmp
& BCM43xx_PIO_RXCTL_DATAAVAILABLE
))
538 bcm43xx_pio_write(queue
, BCM43xx_PIO_RXCTL
,
539 BCM43xx_PIO_RXCTL_DATAAVAILABLE
);
541 for (i
= 0; i
< 10; i
++) {
542 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXCTL
);
543 if (tmp
& BCM43xx_PIO_RXCTL_READY
)
547 dprintkl(KERN_ERR PFX
"PIO RX timed out\n");
551 len
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
552 if (unlikely(len
> 0x700)) {
553 pio_rx_error(queue
, 0, "len > 0x700");
556 if (unlikely(len
== 0 && queue
->mmio_base
!= BCM43xx_MMIO_PIO4_BASE
)) {
557 pio_rx_error(queue
, 0, "len == 0");
560 preamble
[0] = cpu_to_le16(len
);
561 if (queue
->mmio_base
== BCM43xx_MMIO_PIO4_BASE
)
562 preamble_readwords
= 14 / sizeof(u16
);
564 preamble_readwords
= 18 / sizeof(u16
);
565 for (i
= 0; i
< preamble_readwords
; i
++) {
566 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
567 preamble
[i
+ 1] = cpu_to_le16(tmp
);
569 rxhdr
= (struct bcm43xx_rxhdr
*)preamble
;
570 rxflags2
= le16_to_cpu(rxhdr
->flags2
);
571 if (unlikely(rxflags2
& BCM43xx_RXHDR_FLAGS2_INVALIDFRAME
)) {
573 (queue
->mmio_base
== BCM43xx_MMIO_PIO1_BASE
),
577 if (queue
->mmio_base
== BCM43xx_MMIO_PIO4_BASE
) {
578 /* We received an xmit status. */
579 struct bcm43xx_hwxmitstatus
*hw
;
580 struct bcm43xx_xmitstatus stat
;
582 hw
= (struct bcm43xx_hwxmitstatus
*)(preamble
+ 1);
583 stat
.cookie
= le16_to_cpu(hw
->cookie
);
584 stat
.flags
= hw
->flags
;
585 stat
.cnt1
= hw
->cnt1
;
586 stat
.cnt2
= hw
->cnt2
;
587 stat
.seq
= le16_to_cpu(hw
->seq
);
588 stat
.unknown
= le16_to_cpu(hw
->unknown
);
590 bcm43xx_debugfs_log_txstat(queue
->bcm
, &stat
);
591 bcm43xx_pio_handle_xmitstatus(queue
->bcm
, &stat
);
596 skb
= dev_alloc_skb(len
);
597 if (unlikely(!skb
)) {
598 pio_rx_error(queue
, 1, "OOM");
602 for (i
= 0; i
< len
- 1; i
+= 2) {
603 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
604 *((u16
*)(skb
->data
+ i
)) = cpu_to_le16(tmp
);
607 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
608 skb
->data
[len
- 1] = (tmp
& 0x00FF);
609 /* The specs say the following is required, but
610 * it is wrong and corrupts the PLCP. If we don't do
611 * this, the PLCP seems to be correct. So ifdef it out for now.
614 if (rxflags2
& BCM43xx_RXHDR_FLAGS2_TYPE2FRAME
)
615 skb
->data
[2] = (tmp
& 0xFF00) >> 8;
617 skb
->data
[0] = (tmp
& 0xFF00) >> 8;
620 skb_trim(skb
, len
- IEEE80211_FCS_LEN
);
621 bcm43xx_rx(queue
->bcm
, skb
, rxhdr
);
624 void bcm43xx_pio_tx_suspend(struct bcm43xx_pioqueue
*queue
)
626 bcm43xx_power_saving_ctl_bits(queue
->bcm
, -1, 1);
627 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
628 bcm43xx_pio_read(queue
, BCM43xx_PIO_TXCTL
)
629 | BCM43xx_PIO_TXCTL_SUSPEND
);
632 void bcm43xx_pio_tx_resume(struct bcm43xx_pioqueue
*queue
)
634 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
635 bcm43xx_pio_read(queue
, BCM43xx_PIO_TXCTL
)
636 & ~BCM43xx_PIO_TXCTL_SUSPEND
);
637 bcm43xx_power_saving_ctl_bits(queue
->bcm
, -1, -1);
638 if (!list_empty(&queue
->txqueue
))
639 tasklet_schedule(&queue
->txtask
);
642 void bcm43xx_pio_freeze_txqueues(struct bcm43xx_private
*bcm
)
644 struct bcm43xx_pio
*pio
;
646 assert(bcm43xx_using_pio(bcm
));
647 pio
= bcm43xx_current_pio(bcm
);
648 pio
->queue0
->tx_frozen
= 1;
649 pio
->queue1
->tx_frozen
= 1;
650 pio
->queue2
->tx_frozen
= 1;
651 pio
->queue3
->tx_frozen
= 1;
654 void bcm43xx_pio_thaw_txqueues(struct bcm43xx_private
*bcm
)
656 struct bcm43xx_pio
*pio
;
658 assert(bcm43xx_using_pio(bcm
));
659 pio
= bcm43xx_current_pio(bcm
);
660 pio
->queue0
->tx_frozen
= 0;
661 pio
->queue1
->tx_frozen
= 0;
662 pio
->queue2
->tx_frozen
= 0;
663 pio
->queue3
->tx_frozen
= 0;
664 if (!list_empty(&pio
->queue0
->txqueue
))
665 tasklet_schedule(&pio
->queue0
->txtask
);
666 if (!list_empty(&pio
->queue1
->txqueue
))
667 tasklet_schedule(&pio
->queue1
->txtask
);
668 if (!list_empty(&pio
->queue2
->txqueue
))
669 tasklet_schedule(&pio
->queue2
->txtask
);
670 if (!list_empty(&pio
->queue3
->txqueue
))
671 tasklet_schedule(&pio
->queue3
->txtask
);