Commit | Line | Data |
---|---|---|
75388acd LF |
1 | /* |
2 | ||
3 | Broadcom B43legacy wireless driver | |
4 | ||
5 | PIO Transmission | |
6 | ||
7 | Copyright (c) 2005 Michael Buesch <mb@bu3sch.de> | |
8 | ||
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. | |
13 | ||
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. | |
18 | ||
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. | |
23 | ||
24 | */ | |
25 | ||
26 | #include "b43legacy.h" | |
27 | #include "pio.h" | |
28 | #include "main.h" | |
29 | #include "xmit.h" | |
30 | ||
31 | #include <linux/delay.h> | |
32 | ||
33 | ||
34 | static void tx_start(struct b43legacy_pioqueue *queue) | |
35 | { | |
36 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
37 | B43legacy_PIO_TXCTL_INIT); | |
38 | } | |
39 | ||
40 | static void tx_octet(struct b43legacy_pioqueue *queue, | |
41 | u8 octet) | |
42 | { | |
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); | |
47 | } else { | |
48 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
49 | B43legacy_PIO_TXCTL_WRITELO); | |
50 | b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); | |
51 | } | |
52 | } | |
53 | ||
54 | static u16 tx_get_next_word(const u8 *txhdr, | |
55 | const u8 *packet, | |
56 | size_t txhdr_size, | |
57 | unsigned int *pos) | |
58 | { | |
59 | const u8 *source; | |
60 | unsigned int i = *pos; | |
61 | u16 ret; | |
62 | ||
63 | if (i < txhdr_size) | |
64 | source = txhdr; | |
65 | else { | |
66 | source = packet; | |
67 | i -= txhdr_size; | |
68 | } | |
69 | ret = le16_to_cpu(*((__le16 *)(source + i))); | |
70 | *pos += 2; | |
71 | ||
72 | return ret; | |
73 | } | |
74 | ||
75 | static void tx_data(struct b43legacy_pioqueue *queue, | |
76 | u8 *txhdr, | |
77 | const u8 *packet, | |
78 | unsigned int octets) | |
79 | { | |
80 | u16 data; | |
81 | unsigned int i = 0; | |
82 | ||
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); | |
87 | } | |
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); | |
95 | } | |
96 | if (octets % 2) | |
97 | tx_octet(queue, packet[octets - | |
98 | sizeof(struct b43legacy_txhdr_fw3) - 1]); | |
99 | } | |
100 | ||
101 | static void tx_complete(struct b43legacy_pioqueue *queue, | |
102 | struct sk_buff *skb) | |
103 | { | |
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); | |
110 | } else | |
111 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
112 | B43legacy_PIO_TXCTL_COMPLETE); | |
113 | } | |
114 | ||
115 | static u16 generate_cookie(struct b43legacy_pioqueue *queue, | |
116 | struct b43legacy_pio_txpacket *packet) | |
117 | { | |
118 | u16 cookie = 0x0000; | |
119 | int packetindex; | |
120 | ||
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). | |
124 | */ | |
125 | switch (queue->mmio_base) { | |
126 | case B43legacy_MMIO_PIO1_BASE: | |
127 | break; | |
128 | case B43legacy_MMIO_PIO2_BASE: | |
129 | cookie = 0x1000; | |
130 | break; | |
131 | case B43legacy_MMIO_PIO3_BASE: | |
132 | cookie = 0x2000; | |
133 | break; | |
134 | case B43legacy_MMIO_PIO4_BASE: | |
135 | cookie = 0x3000; | |
136 | break; | |
137 | default: | |
138 | B43legacy_WARN_ON(1); | |
139 | } | |
140 | packetindex = pio_txpacket_getindex(packet); | |
141 | B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000)); | |
142 | cookie |= (u16)packetindex; | |
143 | ||
144 | return cookie; | |
145 | } | |
146 | ||
147 | static | |
148 | struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev, | |
149 | u16 cookie, | |
150 | struct b43legacy_pio_txpacket **packet) | |
151 | { | |
152 | struct b43legacy_pio *pio = &dev->pio; | |
153 | struct b43legacy_pioqueue *queue = NULL; | |
154 | int packetindex; | |
155 | ||
156 | switch (cookie & 0xF000) { | |
157 | case 0x0000: | |
158 | queue = pio->queue0; | |
159 | break; | |
160 | case 0x1000: | |
161 | queue = pio->queue1; | |
162 | break; | |
163 | case 0x2000: | |
164 | queue = pio->queue2; | |
165 | break; | |
166 | case 0x3000: | |
167 | queue = pio->queue3; | |
168 | break; | |
169 | default: | |
170 | B43legacy_WARN_ON(1); | |
171 | } | |
172 | packetindex = (cookie & 0x0FFF); | |
173 | B43legacy_WARN_ON(!(packetindex >= 0 && packetindex | |
174 | < B43legacy_PIO_MAXTXPACKETS)); | |
175 | *packet = &(queue->tx_packets_cache[packetindex]); | |
176 | ||
177 | return queue; | |
178 | } | |
179 | ||
180 | union txhdr_union { | |
181 | struct b43legacy_txhdr_fw3 txhdr_fw3; | |
182 | }; | |
183 | ||
9eca9a8e | 184 | static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue, |
75388acd LF |
185 | struct sk_buff *skb, |
186 | struct b43legacy_pio_txpacket *packet, | |
187 | size_t txhdr_size) | |
188 | { | |
189 | union txhdr_union txhdr_data; | |
190 | u8 *txhdr = NULL; | |
191 | unsigned int octets; | |
9eca9a8e | 192 | int err; |
75388acd LF |
193 | |
194 | txhdr = (u8 *)(&txhdr_data.txhdr_fw3); | |
195 | ||
196 | B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); | |
9eca9a8e | 197 | err = b43legacy_generate_txhdr(queue->dev, |
75388acd | 198 | txhdr, skb->data, skb->len, |
e039fa4a | 199 | IEEE80211_SKB_CB(skb), |
75388acd | 200 | generate_cookie(queue, packet)); |
9eca9a8e SB |
201 | if (err) |
202 | return err; | |
75388acd LF |
203 | |
204 | tx_start(queue); | |
205 | octets = skb->len + txhdr_size; | |
206 | if (queue->need_workarounds) | |
207 | octets--; | |
208 | tx_data(queue, txhdr, (u8 *)skb->data, octets); | |
209 | tx_complete(queue, skb); | |
9eca9a8e SB |
210 | |
211 | return 0; | |
75388acd LF |
212 | } |
213 | ||
214 | static void free_txpacket(struct b43legacy_pio_txpacket *packet, | |
215 | int irq_context) | |
216 | { | |
217 | struct b43legacy_pioqueue *queue = packet->queue; | |
218 | ||
219 | if (packet->skb) { | |
220 | if (irq_context) | |
221 | dev_kfree_skb_irq(packet->skb); | |
222 | else | |
223 | dev_kfree_skb(packet->skb); | |
224 | } | |
225 | list_move(&packet->list, &queue->txfree); | |
226 | queue->nr_txfree++; | |
227 | } | |
228 | ||
229 | static int pio_tx_packet(struct b43legacy_pio_txpacket *packet) | |
230 | { | |
231 | struct b43legacy_pioqueue *queue = packet->queue; | |
232 | struct sk_buff *skb = packet->skb; | |
233 | u16 octets; | |
9eca9a8e | 234 | int err; |
75388acd LF |
235 | |
236 | octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3); | |
237 | if (queue->tx_devq_size < octets) { | |
238 | b43legacywarn(queue->dev->wl, "PIO queue too small. " | |
239 | "Dropping packet.\n"); | |
240 | /* Drop it silently (return success) */ | |
241 | free_txpacket(packet, 1); | |
242 | return 0; | |
243 | } | |
244 | B43legacy_WARN_ON(queue->tx_devq_packets > | |
245 | B43legacy_PIO_MAXTXDEVQPACKETS); | |
246 | B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size); | |
247 | /* Check if there is sufficient free space on the device | |
248 | * TX queue. If not, return and let the TX tasklet | |
249 | * retry later. | |
250 | */ | |
251 | if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS) | |
252 | return -EBUSY; | |
253 | if (queue->tx_devq_used + octets > queue->tx_devq_size) | |
254 | return -EBUSY; | |
255 | /* Now poke the device. */ | |
9eca9a8e | 256 | err = pio_tx_write_fragment(queue, skb, packet, |
75388acd | 257 | sizeof(struct b43legacy_txhdr_fw3)); |
9eca9a8e SB |
258 | if (unlikely(err == -ENOKEY)) { |
259 | /* Drop this packet, as we don't have the encryption key | |
260 | * anymore and must not transmit it unencrypted. */ | |
261 | free_txpacket(packet, 1); | |
262 | return 0; | |
263 | } | |
75388acd LF |
264 | |
265 | /* Account for the packet size. | |
266 | * (We must not overflow the device TX queue) | |
267 | */ | |
268 | queue->tx_devq_packets++; | |
269 | queue->tx_devq_used += octets; | |
270 | ||
271 | /* Transmission started, everything ok, move the | |
272 | * packet to the txrunning list. | |
273 | */ | |
274 | list_move_tail(&packet->list, &queue->txrunning); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static void tx_tasklet(unsigned long d) | |
280 | { | |
281 | struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d; | |
282 | struct b43legacy_wldev *dev = queue->dev; | |
283 | unsigned long flags; | |
284 | struct b43legacy_pio_txpacket *packet, *tmp_packet; | |
285 | int err; | |
286 | u16 txctl; | |
287 | ||
288 | spin_lock_irqsave(&dev->wl->irq_lock, flags); | |
289 | if (queue->tx_frozen) | |
290 | goto out_unlock; | |
291 | txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL); | |
292 | if (txctl & B43legacy_PIO_TXCTL_SUSPEND) | |
293 | goto out_unlock; | |
294 | ||
295 | list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) { | |
296 | /* Try to transmit the packet. This can fail, if | |
297 | * the device queue is full. In case of failure, the | |
298 | * packet is left in the txqueue. | |
299 | * If transmission succeed, the packet is moved to txrunning. | |
300 | * If it is impossible to transmit the packet, it | |
301 | * is dropped. | |
302 | */ | |
303 | err = pio_tx_packet(packet); | |
304 | if (err) | |
305 | break; | |
306 | } | |
307 | out_unlock: | |
308 | spin_unlock_irqrestore(&dev->wl->irq_lock, flags); | |
309 | } | |
310 | ||
311 | static void setup_txqueues(struct b43legacy_pioqueue *queue) | |
312 | { | |
313 | struct b43legacy_pio_txpacket *packet; | |
314 | int i; | |
315 | ||
316 | queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS; | |
317 | for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) { | |
318 | packet = &(queue->tx_packets_cache[i]); | |
319 | ||
320 | packet->queue = queue; | |
321 | INIT_LIST_HEAD(&packet->list); | |
322 | ||
323 | list_add(&packet->list, &queue->txfree); | |
324 | } | |
325 | } | |
326 | ||
327 | static | |
328 | struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev, | |
329 | u16 pio_mmio_base) | |
330 | { | |
331 | struct b43legacy_pioqueue *queue; | |
332 | u32 value; | |
333 | u16 qsize; | |
334 | ||
335 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
336 | if (!queue) | |
337 | goto out; | |
338 | ||
339 | queue->dev = dev; | |
340 | queue->mmio_base = pio_mmio_base; | |
341 | queue->need_workarounds = (dev->dev->id.revision < 3); | |
342 | ||
343 | INIT_LIST_HEAD(&queue->txfree); | |
344 | INIT_LIST_HEAD(&queue->txqueue); | |
345 | INIT_LIST_HEAD(&queue->txrunning); | |
346 | tasklet_init(&queue->txtask, tx_tasklet, | |
347 | (unsigned long)queue); | |
348 | ||
e78c9d28 SB |
349 | value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL); |
350 | value &= ~B43legacy_MACCTL_BE; | |
351 | b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value); | |
75388acd LF |
352 | |
353 | qsize = b43legacy_read16(dev, queue->mmio_base | |
354 | + B43legacy_PIO_TXQBUFSIZE); | |
355 | if (qsize == 0) { | |
356 | b43legacyerr(dev->wl, "This card does not support PIO " | |
357 | "operation mode. Please use DMA mode " | |
358 | "(module parameter pio=0).\n"); | |
359 | goto err_freequeue; | |
360 | } | |
361 | if (qsize <= B43legacy_PIO_TXQADJUST) { | |
362 | b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n", | |
363 | qsize); | |
364 | goto err_freequeue; | |
365 | } | |
366 | qsize -= B43legacy_PIO_TXQADJUST; | |
367 | queue->tx_devq_size = qsize; | |
368 | ||
369 | setup_txqueues(queue); | |
370 | ||
371 | out: | |
372 | return queue; | |
373 | ||
374 | err_freequeue: | |
375 | kfree(queue); | |
376 | queue = NULL; | |
377 | goto out; | |
378 | } | |
379 | ||
380 | static void cancel_transfers(struct b43legacy_pioqueue *queue) | |
381 | { | |
382 | struct b43legacy_pio_txpacket *packet, *tmp_packet; | |
383 | ||
384 | tasklet_disable(&queue->txtask); | |
385 | ||
386 | list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list) | |
387 | free_txpacket(packet, 0); | |
388 | list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) | |
389 | free_txpacket(packet, 0); | |
390 | } | |
391 | ||
392 | static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue) | |
393 | { | |
394 | if (!queue) | |
395 | return; | |
396 | ||
397 | cancel_transfers(queue); | |
398 | kfree(queue); | |
399 | } | |
400 | ||
401 | void b43legacy_pio_free(struct b43legacy_wldev *dev) | |
402 | { | |
403 | struct b43legacy_pio *pio; | |
404 | ||
405 | if (!b43legacy_using_pio(dev)) | |
406 | return; | |
407 | pio = &dev->pio; | |
408 | ||
409 | b43legacy_destroy_pioqueue(pio->queue3); | |
410 | pio->queue3 = NULL; | |
411 | b43legacy_destroy_pioqueue(pio->queue2); | |
412 | pio->queue2 = NULL; | |
413 | b43legacy_destroy_pioqueue(pio->queue1); | |
414 | pio->queue1 = NULL; | |
415 | b43legacy_destroy_pioqueue(pio->queue0); | |
416 | pio->queue0 = NULL; | |
417 | } | |
418 | ||
419 | int b43legacy_pio_init(struct b43legacy_wldev *dev) | |
420 | { | |
421 | struct b43legacy_pio *pio = &dev->pio; | |
422 | struct b43legacy_pioqueue *queue; | |
423 | int err = -ENOMEM; | |
424 | ||
425 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE); | |
426 | if (!queue) | |
427 | goto out; | |
428 | pio->queue0 = queue; | |
429 | ||
430 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE); | |
431 | if (!queue) | |
432 | goto err_destroy0; | |
433 | pio->queue1 = queue; | |
434 | ||
435 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE); | |
436 | if (!queue) | |
437 | goto err_destroy1; | |
438 | pio->queue2 = queue; | |
439 | ||
440 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE); | |
441 | if (!queue) | |
442 | goto err_destroy2; | |
443 | pio->queue3 = queue; | |
444 | ||
445 | if (dev->dev->id.revision < 3) | |
446 | dev->irq_savedstate |= B43legacy_IRQ_PIO_WORKAROUND; | |
447 | ||
448 | b43legacydbg(dev->wl, "PIO initialized\n"); | |
449 | err = 0; | |
450 | out: | |
451 | return err; | |
452 | ||
453 | err_destroy2: | |
454 | b43legacy_destroy_pioqueue(pio->queue2); | |
455 | pio->queue2 = NULL; | |
456 | err_destroy1: | |
457 | b43legacy_destroy_pioqueue(pio->queue1); | |
458 | pio->queue1 = NULL; | |
459 | err_destroy0: | |
460 | b43legacy_destroy_pioqueue(pio->queue0); | |
461 | pio->queue0 = NULL; | |
462 | goto out; | |
463 | } | |
464 | ||
465 | int b43legacy_pio_tx(struct b43legacy_wldev *dev, | |
e039fa4a | 466 | struct sk_buff *skb) |
75388acd LF |
467 | { |
468 | struct b43legacy_pioqueue *queue = dev->pio.queue1; | |
469 | struct b43legacy_pio_txpacket *packet; | |
470 | ||
471 | B43legacy_WARN_ON(queue->tx_suspended); | |
472 | B43legacy_WARN_ON(list_empty(&queue->txfree)); | |
473 | ||
474 | packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket, | |
475 | list); | |
476 | packet->skb = skb; | |
477 | ||
75388acd LF |
478 | list_move_tail(&packet->list, &queue->txqueue); |
479 | queue->nr_txfree--; | |
480 | queue->nr_tx_packets++; | |
481 | B43legacy_WARN_ON(queue->nr_txfree >= B43legacy_PIO_MAXTXPACKETS); | |
482 | ||
483 | tasklet_schedule(&queue->txtask); | |
484 | ||
485 | return 0; | |
486 | } | |
487 | ||
488 | void b43legacy_pio_handle_txstatus(struct b43legacy_wldev *dev, | |
489 | const struct b43legacy_txstatus *status) | |
490 | { | |
491 | struct b43legacy_pioqueue *queue; | |
492 | struct b43legacy_pio_txpacket *packet; | |
e039fa4a | 493 | struct ieee80211_tx_info *info; |
75388acd LF |
494 | |
495 | queue = parse_cookie(dev, status->cookie, &packet); | |
496 | B43legacy_WARN_ON(!queue); | |
497 | ||
0cd67d48 SB |
498 | if (!packet->skb) |
499 | return; | |
500 | ||
75388acd LF |
501 | queue->tx_devq_packets--; |
502 | queue->tx_devq_used -= (packet->skb->len + | |
503 | sizeof(struct b43legacy_txhdr_fw3)); | |
504 | ||
e039fa4a JB |
505 | info = IEEE80211_SKB_CB(packet->skb); |
506 | memset(&info->status, 0, sizeof(info->status)); | |
507 | ||
75388acd | 508 | if (status->acked) |
e039fa4a JB |
509 | info->flags |= IEEE80211_TX_STAT_ACK; |
510 | info->status.retry_count = status->frame_count - 1; | |
511 | ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb); | |
75388acd LF |
512 | packet->skb = NULL; |
513 | ||
514 | free_txpacket(packet, 1); | |
515 | /* If there are packets on the txqueue, poke the tasklet | |
516 | * to transmit them. | |
517 | */ | |
518 | if (!list_empty(&queue->txqueue)) | |
519 | tasklet_schedule(&queue->txtask); | |
520 | } | |
521 | ||
522 | void b43legacy_pio_get_tx_stats(struct b43legacy_wldev *dev, | |
523 | struct ieee80211_tx_queue_stats *stats) | |
524 | { | |
525 | struct b43legacy_pio *pio = &dev->pio; | |
526 | struct b43legacy_pioqueue *queue; | |
75388acd LF |
527 | |
528 | queue = pio->queue1; | |
57ffc589 JB |
529 | stats[0].len = B43legacy_PIO_MAXTXPACKETS - queue->nr_txfree; |
530 | stats[0].limit = B43legacy_PIO_MAXTXPACKETS; | |
531 | stats[0].count = queue->nr_tx_packets; | |
75388acd LF |
532 | } |
533 | ||
534 | static void pio_rx_error(struct b43legacy_pioqueue *queue, | |
535 | int clear_buffers, | |
536 | const char *error) | |
537 | { | |
538 | int i; | |
539 | ||
540 | b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error); | |
541 | b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, | |
542 | B43legacy_PIO_RXCTL_READY); | |
543 | if (clear_buffers) { | |
544 | B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE); | |
545 | for (i = 0; i < 15; i++) { | |
546 | /* Dummy read. */ | |
547 | b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
548 | } | |
549 | } | |
550 | } | |
551 | ||
552 | void b43legacy_pio_rx(struct b43legacy_pioqueue *queue) | |
553 | { | |
554 | __le16 preamble[21] = { 0 }; | |
555 | struct b43legacy_rxhdr_fw3 *rxhdr; | |
556 | u16 tmp; | |
557 | u16 len; | |
558 | u16 macstat; | |
559 | int i; | |
560 | int preamble_readwords; | |
561 | struct sk_buff *skb; | |
562 | ||
563 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); | |
564 | if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE)) | |
565 | return; | |
566 | b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, | |
567 | B43legacy_PIO_RXCTL_DATAAVAILABLE); | |
568 | ||
569 | for (i = 0; i < 10; i++) { | |
570 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); | |
571 | if (tmp & B43legacy_PIO_RXCTL_READY) | |
572 | goto data_ready; | |
573 | udelay(10); | |
574 | } | |
575 | b43legacydbg(queue->dev->wl, "PIO RX timed out\n"); | |
576 | return; | |
577 | data_ready: | |
578 | ||
579 | len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
580 | if (unlikely(len > 0x700)) { | |
581 | pio_rx_error(queue, 0, "len > 0x700"); | |
582 | return; | |
583 | } | |
584 | if (unlikely(len == 0 && queue->mmio_base != | |
585 | B43legacy_MMIO_PIO4_BASE)) { | |
586 | pio_rx_error(queue, 0, "len == 0"); | |
587 | return; | |
588 | } | |
589 | preamble[0] = cpu_to_le16(len); | |
590 | if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) | |
591 | preamble_readwords = 14 / sizeof(u16); | |
592 | else | |
593 | preamble_readwords = 18 / sizeof(u16); | |
594 | for (i = 0; i < preamble_readwords; i++) { | |
595 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
596 | preamble[i + 1] = cpu_to_le16(tmp); | |
597 | } | |
598 | rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble; | |
599 | macstat = le16_to_cpu(rxhdr->mac_status); | |
600 | if (macstat & B43legacy_RX_MAC_FCSERR) { | |
601 | pio_rx_error(queue, | |
602 | (queue->mmio_base == B43legacy_MMIO_PIO1_BASE), | |
603 | "Frame FCS error"); | |
604 | return; | |
605 | } | |
606 | if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) { | |
607 | /* We received an xmit status. */ | |
608 | struct b43legacy_hwtxstatus *hw; | |
609 | ||
610 | hw = (struct b43legacy_hwtxstatus *)(preamble + 1); | |
611 | b43legacy_handle_hwtxstatus(queue->dev, hw); | |
612 | ||
613 | return; | |
614 | } | |
615 | ||
616 | skb = dev_alloc_skb(len); | |
617 | if (unlikely(!skb)) { | |
618 | pio_rx_error(queue, 1, "OOM"); | |
619 | return; | |
620 | } | |
621 | skb_put(skb, len); | |
622 | for (i = 0; i < len - 1; i += 2) { | |
623 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
624 | *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp); | |
625 | } | |
626 | if (len % 2) { | |
627 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
628 | skb->data[len - 1] = (tmp & 0x00FF); | |
629 | } | |
630 | b43legacy_rx(queue->dev, skb, rxhdr); | |
631 | } | |
632 | ||
633 | void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue) | |
634 | { | |
635 | b43legacy_power_saving_ctl_bits(queue->dev, -1, 1); | |
636 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
637 | b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) | |
638 | | B43legacy_PIO_TXCTL_SUSPEND); | |
639 | } | |
640 | ||
641 | void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue) | |
642 | { | |
643 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
644 | b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) | |
645 | & ~B43legacy_PIO_TXCTL_SUSPEND); | |
646 | b43legacy_power_saving_ctl_bits(queue->dev, -1, -1); | |
647 | tasklet_schedule(&queue->txtask); | |
648 | } | |
649 | ||
650 | void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev) | |
651 | { | |
652 | struct b43legacy_pio *pio; | |
653 | ||
654 | B43legacy_WARN_ON(!b43legacy_using_pio(dev)); | |
655 | pio = &dev->pio; | |
656 | pio->queue0->tx_frozen = 1; | |
657 | pio->queue1->tx_frozen = 1; | |
658 | pio->queue2->tx_frozen = 1; | |
659 | pio->queue3->tx_frozen = 1; | |
660 | } | |
661 | ||
662 | void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev) | |
663 | { | |
664 | struct b43legacy_pio *pio; | |
665 | ||
666 | B43legacy_WARN_ON(!b43legacy_using_pio(dev)); | |
667 | pio = &dev->pio; | |
668 | pio->queue0->tx_frozen = 0; | |
669 | pio->queue1->tx_frozen = 0; | |
670 | pio->queue2->tx_frozen = 0; | |
671 | pio->queue3->tx_frozen = 0; | |
672 | if (!list_empty(&pio->queue0->txqueue)) | |
673 | tasklet_schedule(&pio->queue0->txtask); | |
674 | if (!list_empty(&pio->queue1->txqueue)) | |
675 | tasklet_schedule(&pio->queue1->txtask); | |
676 | if (!list_empty(&pio->queue2->txqueue)) | |
677 | tasklet_schedule(&pio->queue2->txtask); | |
678 | if (!list_empty(&pio->queue3->txqueue)) | |
679 | tasklet_schedule(&pio->queue3->txtask); | |
680 | } |