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"
31 #include <linux/delay.h>
34 static void tx_start(struct bcm43xx_pioqueue
*queue
)
36 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
37 BCM43xx_PIO_TXCTL_INIT
);
40 static void tx_octet(struct bcm43xx_pioqueue
*queue
,
43 if (queue
->need_workarounds
) {
44 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXDATA
,
46 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
47 BCM43xx_PIO_TXCTL_WRITEHI
);
49 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
50 BCM43xx_PIO_TXCTL_WRITEHI
);
51 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXDATA
,
56 static u16
tx_get_next_word(struct bcm43xx_txhdr
*txhdr
,
61 unsigned int i
= *pos
;
64 if (i
< sizeof(*txhdr
)) {
65 source
= (const u8
*)txhdr
;
70 ret
= le16_to_cpu( *((u16
*)(source
+ i
)) );
76 static void tx_data(struct bcm43xx_pioqueue
*queue
,
77 struct bcm43xx_txhdr
*txhdr
,
84 if (queue
->need_workarounds
) {
85 data
= tx_get_next_word(txhdr
, packet
, &i
);
86 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXDATA
, data
);
88 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
89 BCM43xx_PIO_TXCTL_WRITELO
|
90 BCM43xx_PIO_TXCTL_WRITEHI
);
91 while (i
< octets
- 1) {
92 data
= tx_get_next_word(txhdr
, packet
, &i
);
93 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXDATA
, data
);
96 tx_octet(queue
, packet
[octets
- sizeof(*txhdr
) - 1]);
99 static void tx_complete(struct bcm43xx_pioqueue
*queue
,
102 if (queue
->need_workarounds
) {
103 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXDATA
,
104 skb
->data
[skb
->len
- 1]);
105 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
106 BCM43xx_PIO_TXCTL_WRITEHI
|
107 BCM43xx_PIO_TXCTL_COMPLETE
);
109 bcm43xx_pio_write(queue
, BCM43xx_PIO_TXCTL
,
110 BCM43xx_PIO_TXCTL_COMPLETE
);
114 static u16
generate_cookie(struct bcm43xx_pioqueue
*queue
,
119 /* We use the upper 4 bits for the PIO
120 * controller ID and the lower 12 bits
121 * for the packet index (in the cache).
123 switch (queue
->mmio_base
) {
124 case BCM43xx_MMIO_PIO1_BASE
:
126 case BCM43xx_MMIO_PIO2_BASE
:
129 case BCM43xx_MMIO_PIO3_BASE
:
132 case BCM43xx_MMIO_PIO4_BASE
:
138 assert(((u16
)packetindex
& 0xF000) == 0x0000);
139 cookie
|= (u16
)packetindex
;
145 struct bcm43xx_pioqueue
* parse_cookie(struct bcm43xx_private
*bcm
,
147 struct bcm43xx_pio_txpacket
**packet
)
149 struct bcm43xx_pio
*pio
= bcm43xx_current_pio(bcm
);
150 struct bcm43xx_pioqueue
*queue
= NULL
;
153 switch (cookie
& 0xF000) {
169 packetindex
= (cookie
& 0x0FFF);
170 assert(packetindex
>= 0 && packetindex
< BCM43xx_PIO_MAXTXPACKETS
);
171 *packet
= &(queue
->tx_packets_cache
[packetindex
]);
176 static void pio_tx_write_fragment(struct bcm43xx_pioqueue
*queue
,
178 struct bcm43xx_pio_txpacket
*packet
)
180 struct bcm43xx_txhdr txhdr
;
183 assert(skb_shinfo(skb
)->nr_frags
== 0);
184 bcm43xx_generate_txhdr(queue
->bcm
,
185 &txhdr
, skb
->data
, skb
->len
,
186 (packet
->xmitted_frags
== 0),
187 generate_cookie(queue
, pio_txpacket_getindex(packet
)));
190 octets
= skb
->len
+ sizeof(txhdr
);
191 if (queue
->need_workarounds
)
193 tx_data(queue
, &txhdr
, (u8
*)skb
->data
, octets
);
194 tx_complete(queue
, skb
);
197 static void free_txpacket(struct bcm43xx_pio_txpacket
*packet
,
200 struct bcm43xx_pioqueue
*queue
= packet
->queue
;
202 ieee80211_txb_free(packet
->txb
);
203 list_move(&packet
->list
, &queue
->txfree
);
206 assert(queue
->tx_devq_used
>= packet
->xmitted_octets
);
207 assert(queue
->tx_devq_packets
>= packet
->xmitted_frags
);
208 queue
->tx_devq_used
-= packet
->xmitted_octets
;
209 queue
->tx_devq_packets
-= packet
->xmitted_frags
;
212 static int pio_tx_packet(struct bcm43xx_pio_txpacket
*packet
)
214 struct bcm43xx_pioqueue
*queue
= packet
->queue
;
215 struct ieee80211_txb
*txb
= packet
->txb
;
220 for (i
= packet
->xmitted_frags
; i
< txb
->nr_frags
; i
++) {
221 skb
= txb
->fragments
[i
];
223 octets
= (u16
)skb
->len
+ sizeof(struct bcm43xx_txhdr
);
224 assert(queue
->tx_devq_size
>= octets
);
225 assert(queue
->tx_devq_packets
<= BCM43xx_PIO_MAXTXDEVQPACKETS
);
226 assert(queue
->tx_devq_used
<= queue
->tx_devq_size
);
227 /* Check if there is sufficient free space on the device
228 * TX queue. If not, return and let the TX tasklet
231 if (queue
->tx_devq_packets
== BCM43xx_PIO_MAXTXDEVQPACKETS
)
233 if (queue
->tx_devq_used
+ octets
> queue
->tx_devq_size
)
235 /* Now poke the device. */
236 pio_tx_write_fragment(queue
, skb
, packet
);
238 /* Account for the packet size.
239 * (We must not overflow the device TX queue)
241 queue
->tx_devq_packets
++;
242 queue
->tx_devq_used
+= octets
;
244 assert(packet
->xmitted_frags
<= packet
->txb
->nr_frags
);
245 packet
->xmitted_frags
++;
246 packet
->xmitted_octets
+= octets
;
248 list_move_tail(&packet
->list
, &queue
->txrunning
);
253 static void tx_tasklet(unsigned long d
)
255 struct bcm43xx_pioqueue
*queue
= (struct bcm43xx_pioqueue
*)d
;
256 struct bcm43xx_private
*bcm
= queue
->bcm
;
258 struct bcm43xx_pio_txpacket
*packet
, *tmp_packet
;
261 bcm43xx_lock_mmio(bcm
, flags
);
262 list_for_each_entry_safe(packet
, tmp_packet
, &queue
->txqueue
, list
) {
263 assert(packet
->xmitted_frags
< packet
->txb
->nr_frags
);
264 if (packet
->xmitted_frags
== 0) {
268 /* Check if the device queue is big
269 * enough for every fragment. If not, drop the
272 for (i
= 0; i
< packet
->txb
->nr_frags
; i
++) {
273 skb
= packet
->txb
->fragments
[i
];
274 if (unlikely(skb
->len
> queue
->tx_devq_size
)) {
275 dprintkl(KERN_ERR PFX
"PIO TX device queue too small. "
276 "Dropping packet.\n");
277 free_txpacket(packet
, 1);
282 /* Try to transmit the packet.
283 * This may not completely succeed.
285 err
= pio_tx_packet(packet
);
291 bcm43xx_unlock_mmio(bcm
, flags
);
294 static void setup_txqueues(struct bcm43xx_pioqueue
*queue
)
296 struct bcm43xx_pio_txpacket
*packet
;
299 queue
->nr_txfree
= BCM43xx_PIO_MAXTXPACKETS
;
300 for (i
= 0; i
< BCM43xx_PIO_MAXTXPACKETS
; i
++) {
301 packet
= &(queue
->tx_packets_cache
[i
]);
303 packet
->queue
= queue
;
304 INIT_LIST_HEAD(&packet
->list
);
306 list_add(&packet
->list
, &queue
->txfree
);
311 struct bcm43xx_pioqueue
* bcm43xx_setup_pioqueue(struct bcm43xx_private
*bcm
,
314 struct bcm43xx_pioqueue
*queue
;
318 queue
= kzalloc(sizeof(*queue
), GFP_KERNEL
);
323 queue
->mmio_base
= pio_mmio_base
;
324 queue
->need_workarounds
= (bcm
->current_core
->rev
< 3);
326 INIT_LIST_HEAD(&queue
->txfree
);
327 INIT_LIST_HEAD(&queue
->txqueue
);
328 INIT_LIST_HEAD(&queue
->txrunning
);
329 tasklet_init(&queue
->txtask
, tx_tasklet
,
330 (unsigned long)queue
);
332 value
= bcm43xx_read32(bcm
, BCM43xx_MMIO_STATUS_BITFIELD
);
333 value
|= BCM43xx_SBF_XFER_REG_BYTESWAP
;
334 bcm43xx_write32(bcm
, BCM43xx_MMIO_STATUS_BITFIELD
, value
);
336 qsize
= bcm43xx_read16(bcm
, queue
->mmio_base
+ BCM43xx_PIO_TXQBUFSIZE
);
337 if (qsize
<= BCM43xx_PIO_TXQADJUST
) {
338 printk(KERN_ERR PFX
"PIO tx device-queue too small (%u)\n", qsize
);
341 qsize
-= BCM43xx_PIO_TXQADJUST
;
342 queue
->tx_devq_size
= qsize
;
344 setup_txqueues(queue
);
355 static void cancel_transfers(struct bcm43xx_pioqueue
*queue
)
357 struct bcm43xx_pio_txpacket
*packet
, *tmp_packet
;
359 netif_tx_disable(queue
->bcm
->net_dev
);
360 assert(queue
->bcm
->shutting_down
);
361 tasklet_disable(&queue
->txtask
);
363 list_for_each_entry_safe(packet
, tmp_packet
, &queue
->txrunning
, list
)
364 free_txpacket(packet
, 0);
365 list_for_each_entry_safe(packet
, tmp_packet
, &queue
->txqueue
, list
)
366 free_txpacket(packet
, 0);
369 static void bcm43xx_destroy_pioqueue(struct bcm43xx_pioqueue
*queue
)
374 cancel_transfers(queue
);
378 void bcm43xx_pio_free(struct bcm43xx_private
*bcm
)
380 struct bcm43xx_pio
*pio
= bcm43xx_current_pio(bcm
);
382 bcm43xx_destroy_pioqueue(pio
->queue3
);
384 bcm43xx_destroy_pioqueue(pio
->queue2
);
386 bcm43xx_destroy_pioqueue(pio
->queue1
);
388 bcm43xx_destroy_pioqueue(pio
->queue0
);
392 int bcm43xx_pio_init(struct bcm43xx_private
*bcm
)
394 struct bcm43xx_pio
*pio
= bcm43xx_current_pio(bcm
);
395 struct bcm43xx_pioqueue
*queue
;
398 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO1_BASE
);
403 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO2_BASE
);
408 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO3_BASE
);
413 queue
= bcm43xx_setup_pioqueue(bcm
, BCM43xx_MMIO_PIO4_BASE
);
418 if (bcm
->current_core
->rev
< 3)
419 bcm
->irq_savedstate
|= BCM43xx_IRQ_PIO_WORKAROUND
;
421 dprintk(KERN_INFO PFX
"PIO initialized\n");
427 bcm43xx_destroy_pioqueue(pio
->queue2
);
430 bcm43xx_destroy_pioqueue(pio
->queue1
);
433 bcm43xx_destroy_pioqueue(pio
->queue0
);
438 int bcm43xx_pio_tx(struct bcm43xx_private
*bcm
,
439 struct ieee80211_txb
*txb
)
441 struct bcm43xx_pioqueue
*queue
= bcm43xx_current_pio(bcm
)->queue1
;
442 struct bcm43xx_pio_txpacket
*packet
;
445 assert(!queue
->tx_suspended
);
446 assert(!list_empty(&queue
->txfree
));
448 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_TXCTL
);
449 if (tmp
& BCM43xx_PIO_TXCTL_SUSPEND
)
452 packet
= list_entry(queue
->txfree
.next
, struct bcm43xx_pio_txpacket
, list
);
454 packet
->xmitted_frags
= 0;
455 packet
->xmitted_octets
= 0;
456 list_move_tail(&packet
->list
, &queue
->txqueue
);
458 assert(queue
->nr_txfree
< BCM43xx_PIO_MAXTXPACKETS
);
460 /* Suspend TX, if we are out of packets in the "free" queue. */
461 if (unlikely(list_empty(&queue
->txfree
))) {
462 netif_stop_queue(queue
->bcm
->net_dev
);
463 queue
->tx_suspended
= 1;
466 tasklet_schedule(&queue
->txtask
);
471 void bcm43xx_pio_handle_xmitstatus(struct bcm43xx_private
*bcm
,
472 struct bcm43xx_xmitstatus
*status
)
474 struct bcm43xx_pioqueue
*queue
;
475 struct bcm43xx_pio_txpacket
*packet
;
477 queue
= parse_cookie(bcm
, status
->cookie
, &packet
);
482 free_txpacket(packet
, 1);
483 if (unlikely(queue
->tx_suspended
)) {
484 queue
->tx_suspended
= 0;
485 netif_wake_queue(queue
->bcm
->net_dev
);
487 /* If there are packets on the txqueue, poke the tasklet. */
488 if (!list_empty(&queue
->txqueue
))
489 tasklet_schedule(&queue
->txtask
);
492 static void pio_rx_error(struct bcm43xx_pioqueue
*queue
,
498 printkl("PIO RX error: %s\n", error
);
499 bcm43xx_pio_write(queue
, BCM43xx_PIO_RXCTL
,
500 BCM43xx_PIO_RXCTL_READY
);
502 assert(queue
->mmio_base
== BCM43xx_MMIO_PIO1_BASE
);
503 for (i
= 0; i
< 15; i
++) {
505 bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
510 void bcm43xx_pio_rx(struct bcm43xx_pioqueue
*queue
)
512 u16 preamble
[21] = { 0 };
513 struct bcm43xx_rxhdr
*rxhdr
;
514 u16 tmp
, len
, rxflags2
;
515 int i
, preamble_readwords
;
519 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXCTL
);
520 if (!(tmp
& BCM43xx_PIO_RXCTL_DATAAVAILABLE
)) {
521 dprintkl(KERN_ERR PFX
"PIO RX: No data available\n");//TODO: remove this printk.
524 bcm43xx_pio_write(queue
, BCM43xx_PIO_RXCTL
,
525 BCM43xx_PIO_RXCTL_DATAAVAILABLE
);
527 for (i
= 0; i
< 10; i
++) {
528 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXCTL
);
529 if (tmp
& BCM43xx_PIO_RXCTL_READY
)
533 dprintkl(KERN_ERR PFX
"PIO RX timed out\n");
537 //FIXME: endianess in this function.
538 len
= le16_to_cpu(bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
));
539 if (unlikely(len
> 0x700)) {
540 pio_rx_error(queue
, 0, "len > 0x700");
543 if (unlikely(len
== 0 && queue
->mmio_base
!= BCM43xx_MMIO_PIO4_BASE
)) {
544 pio_rx_error(queue
, 0, "len == 0");
547 preamble
[0] = cpu_to_le16(len
);
548 if (queue
->mmio_base
== BCM43xx_MMIO_PIO4_BASE
)
549 preamble_readwords
= 14 / sizeof(u16
);
551 preamble_readwords
= 18 / sizeof(u16
);
552 for (i
= 0; i
< preamble_readwords
; i
++) {
553 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
554 preamble
[i
+ 1] = cpu_to_be16(tmp
);//FIXME?
556 rxhdr
= (struct bcm43xx_rxhdr
*)preamble
;
557 rxflags2
= le16_to_cpu(rxhdr
->flags2
);
558 if (unlikely(rxflags2
& BCM43xx_RXHDR_FLAGS2_INVALIDFRAME
)) {
560 (queue
->mmio_base
== BCM43xx_MMIO_PIO1_BASE
),
564 if (queue
->mmio_base
== BCM43xx_MMIO_PIO4_BASE
) {
565 /* We received an xmit status. */
566 struct bcm43xx_hwxmitstatus
*hw
;
567 struct bcm43xx_xmitstatus stat
;
569 hw
= (struct bcm43xx_hwxmitstatus
*)(preamble
+ 1);
570 stat
.cookie
= le16_to_cpu(hw
->cookie
);
571 stat
.flags
= hw
->flags
;
572 stat
.cnt1
= hw
->cnt1
;
573 stat
.cnt2
= hw
->cnt2
;
574 stat
.seq
= le16_to_cpu(hw
->seq
);
575 stat
.unknown
= le16_to_cpu(hw
->unknown
);
577 bcm43xx_debugfs_log_txstat(queue
->bcm
, &stat
);
578 bcm43xx_pio_handle_xmitstatus(queue
->bcm
, &stat
);
583 skb
= dev_alloc_skb(len
);
584 if (unlikely(!skb
)) {
585 pio_rx_error(queue
, 1, "OOM");
589 for (i
= 0; i
< len
- 1; i
+= 2) {
590 tmp
= cpu_to_be16(bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
));
591 *((u16
*)(skb
->data
+ i
)) = tmp
;
594 tmp
= bcm43xx_pio_read(queue
, BCM43xx_PIO_RXDATA
);
595 skb
->data
[len
- 1] = (tmp
& 0x00FF);
596 if (rxflags2
& BCM43xx_RXHDR_FLAGS2_TYPE2FRAME
)
597 skb
->data
[0x20] = (tmp
& 0xFF00) >> 8;
599 skb
->data
[0x1E] = (tmp
& 0xFF00) >> 8;
601 bcm43xx_rx(queue
->bcm
, skb
, rxhdr
);
604 /* vim: set ts=8 sw=8 sts=8: */