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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> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
75388acd LF |
33 | |
34 | ||
35 | static void tx_start(struct b43legacy_pioqueue *queue) | |
36 | { | |
37 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
38 | B43legacy_PIO_TXCTL_INIT); | |
39 | } | |
40 | ||
41 | static void tx_octet(struct b43legacy_pioqueue *queue, | |
42 | u8 octet) | |
43 | { | |
44 | if (queue->need_workarounds) { | |
45 | b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); | |
46 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
47 | B43legacy_PIO_TXCTL_WRITELO); | |
48 | } else { | |
49 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
50 | B43legacy_PIO_TXCTL_WRITELO); | |
51 | b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, octet); | |
52 | } | |
53 | } | |
54 | ||
55 | static u16 tx_get_next_word(const u8 *txhdr, | |
56 | const u8 *packet, | |
57 | size_t txhdr_size, | |
58 | unsigned int *pos) | |
59 | { | |
60 | const u8 *source; | |
61 | unsigned int i = *pos; | |
62 | u16 ret; | |
63 | ||
64 | if (i < txhdr_size) | |
65 | source = txhdr; | |
66 | else { | |
67 | source = packet; | |
68 | i -= txhdr_size; | |
69 | } | |
70 | ret = le16_to_cpu(*((__le16 *)(source + i))); | |
71 | *pos += 2; | |
72 | ||
73 | return ret; | |
74 | } | |
75 | ||
76 | static void tx_data(struct b43legacy_pioqueue *queue, | |
77 | u8 *txhdr, | |
78 | const u8 *packet, | |
79 | unsigned int octets) | |
80 | { | |
81 | u16 data; | |
82 | unsigned int i = 0; | |
83 | ||
84 | if (queue->need_workarounds) { | |
85 | data = tx_get_next_word(txhdr, packet, | |
86 | sizeof(struct b43legacy_txhdr_fw3), &i); | |
87 | b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); | |
88 | } | |
89 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
90 | B43legacy_PIO_TXCTL_WRITELO | | |
91 | B43legacy_PIO_TXCTL_WRITEHI); | |
92 | while (i < octets - 1) { | |
93 | data = tx_get_next_word(txhdr, packet, | |
94 | sizeof(struct b43legacy_txhdr_fw3), &i); | |
95 | b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, data); | |
96 | } | |
97 | if (octets % 2) | |
98 | tx_octet(queue, packet[octets - | |
99 | sizeof(struct b43legacy_txhdr_fw3) - 1]); | |
100 | } | |
101 | ||
102 | static void tx_complete(struct b43legacy_pioqueue *queue, | |
103 | struct sk_buff *skb) | |
104 | { | |
105 | if (queue->need_workarounds) { | |
106 | b43legacy_pio_write(queue, B43legacy_PIO_TXDATA, | |
107 | skb->data[skb->len - 1]); | |
108 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
109 | B43legacy_PIO_TXCTL_WRITELO | | |
110 | B43legacy_PIO_TXCTL_COMPLETE); | |
111 | } else | |
112 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
113 | B43legacy_PIO_TXCTL_COMPLETE); | |
114 | } | |
115 | ||
116 | static u16 generate_cookie(struct b43legacy_pioqueue *queue, | |
117 | struct b43legacy_pio_txpacket *packet) | |
118 | { | |
119 | u16 cookie = 0x0000; | |
120 | int packetindex; | |
121 | ||
122 | /* We use the upper 4 bits for the PIO | |
123 | * controller ID and the lower 12 bits | |
124 | * for the packet index (in the cache). | |
125 | */ | |
126 | switch (queue->mmio_base) { | |
127 | case B43legacy_MMIO_PIO1_BASE: | |
128 | break; | |
129 | case B43legacy_MMIO_PIO2_BASE: | |
130 | cookie = 0x1000; | |
131 | break; | |
132 | case B43legacy_MMIO_PIO3_BASE: | |
133 | cookie = 0x2000; | |
134 | break; | |
135 | case B43legacy_MMIO_PIO4_BASE: | |
136 | cookie = 0x3000; | |
137 | break; | |
138 | default: | |
139 | B43legacy_WARN_ON(1); | |
140 | } | |
141 | packetindex = pio_txpacket_getindex(packet); | |
142 | B43legacy_WARN_ON(!(((u16)packetindex & 0xF000) == 0x0000)); | |
143 | cookie |= (u16)packetindex; | |
144 | ||
145 | return cookie; | |
146 | } | |
147 | ||
148 | static | |
149 | struct b43legacy_pioqueue *parse_cookie(struct b43legacy_wldev *dev, | |
150 | u16 cookie, | |
151 | struct b43legacy_pio_txpacket **packet) | |
152 | { | |
153 | struct b43legacy_pio *pio = &dev->pio; | |
154 | struct b43legacy_pioqueue *queue = NULL; | |
155 | int packetindex; | |
156 | ||
157 | switch (cookie & 0xF000) { | |
158 | case 0x0000: | |
159 | queue = pio->queue0; | |
160 | break; | |
161 | case 0x1000: | |
162 | queue = pio->queue1; | |
163 | break; | |
164 | case 0x2000: | |
165 | queue = pio->queue2; | |
166 | break; | |
167 | case 0x3000: | |
168 | queue = pio->queue3; | |
169 | break; | |
170 | default: | |
171 | B43legacy_WARN_ON(1); | |
172 | } | |
173 | packetindex = (cookie & 0x0FFF); | |
174 | B43legacy_WARN_ON(!(packetindex >= 0 && packetindex | |
175 | < B43legacy_PIO_MAXTXPACKETS)); | |
176 | *packet = &(queue->tx_packets_cache[packetindex]); | |
177 | ||
178 | return queue; | |
179 | } | |
180 | ||
181 | union txhdr_union { | |
182 | struct b43legacy_txhdr_fw3 txhdr_fw3; | |
183 | }; | |
184 | ||
9eca9a8e | 185 | static int pio_tx_write_fragment(struct b43legacy_pioqueue *queue, |
75388acd LF |
186 | struct sk_buff *skb, |
187 | struct b43legacy_pio_txpacket *packet, | |
188 | size_t txhdr_size) | |
189 | { | |
190 | union txhdr_union txhdr_data; | |
191 | u8 *txhdr = NULL; | |
192 | unsigned int octets; | |
9eca9a8e | 193 | int err; |
75388acd LF |
194 | |
195 | txhdr = (u8 *)(&txhdr_data.txhdr_fw3); | |
196 | ||
197 | B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags != 0); | |
9eca9a8e | 198 | err = b43legacy_generate_txhdr(queue->dev, |
75388acd | 199 | txhdr, skb->data, skb->len, |
e039fa4a | 200 | IEEE80211_SKB_CB(skb), |
75388acd | 201 | generate_cookie(queue, packet)); |
9eca9a8e SB |
202 | if (err) |
203 | return err; | |
75388acd LF |
204 | |
205 | tx_start(queue); | |
206 | octets = skb->len + txhdr_size; | |
207 | if (queue->need_workarounds) | |
208 | octets--; | |
209 | tx_data(queue, txhdr, (u8 *)skb->data, octets); | |
210 | tx_complete(queue, skb); | |
9eca9a8e SB |
211 | |
212 | return 0; | |
75388acd LF |
213 | } |
214 | ||
215 | static void free_txpacket(struct b43legacy_pio_txpacket *packet, | |
216 | int irq_context) | |
217 | { | |
218 | struct b43legacy_pioqueue *queue = packet->queue; | |
219 | ||
220 | if (packet->skb) { | |
221 | if (irq_context) | |
222 | dev_kfree_skb_irq(packet->skb); | |
223 | else | |
224 | dev_kfree_skb(packet->skb); | |
225 | } | |
226 | list_move(&packet->list, &queue->txfree); | |
227 | queue->nr_txfree++; | |
228 | } | |
229 | ||
230 | static int pio_tx_packet(struct b43legacy_pio_txpacket *packet) | |
231 | { | |
232 | struct b43legacy_pioqueue *queue = packet->queue; | |
233 | struct sk_buff *skb = packet->skb; | |
234 | u16 octets; | |
9eca9a8e | 235 | int err; |
75388acd LF |
236 | |
237 | octets = (u16)skb->len + sizeof(struct b43legacy_txhdr_fw3); | |
238 | if (queue->tx_devq_size < octets) { | |
239 | b43legacywarn(queue->dev->wl, "PIO queue too small. " | |
240 | "Dropping packet.\n"); | |
241 | /* Drop it silently (return success) */ | |
242 | free_txpacket(packet, 1); | |
243 | return 0; | |
244 | } | |
245 | B43legacy_WARN_ON(queue->tx_devq_packets > | |
246 | B43legacy_PIO_MAXTXDEVQPACKETS); | |
247 | B43legacy_WARN_ON(queue->tx_devq_used > queue->tx_devq_size); | |
248 | /* Check if there is sufficient free space on the device | |
249 | * TX queue. If not, return and let the TX tasklet | |
250 | * retry later. | |
251 | */ | |
252 | if (queue->tx_devq_packets == B43legacy_PIO_MAXTXDEVQPACKETS) | |
253 | return -EBUSY; | |
254 | if (queue->tx_devq_used + octets > queue->tx_devq_size) | |
255 | return -EBUSY; | |
256 | /* Now poke the device. */ | |
9eca9a8e | 257 | err = pio_tx_write_fragment(queue, skb, packet, |
75388acd | 258 | sizeof(struct b43legacy_txhdr_fw3)); |
9eca9a8e SB |
259 | if (unlikely(err == -ENOKEY)) { |
260 | /* Drop this packet, as we don't have the encryption key | |
261 | * anymore and must not transmit it unencrypted. */ | |
262 | free_txpacket(packet, 1); | |
263 | return 0; | |
264 | } | |
75388acd LF |
265 | |
266 | /* Account for the packet size. | |
267 | * (We must not overflow the device TX queue) | |
268 | */ | |
269 | queue->tx_devq_packets++; | |
270 | queue->tx_devq_used += octets; | |
271 | ||
272 | /* Transmission started, everything ok, move the | |
273 | * packet to the txrunning list. | |
274 | */ | |
275 | list_move_tail(&packet->list, &queue->txrunning); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static void tx_tasklet(unsigned long d) | |
281 | { | |
282 | struct b43legacy_pioqueue *queue = (struct b43legacy_pioqueue *)d; | |
283 | struct b43legacy_wldev *dev = queue->dev; | |
284 | unsigned long flags; | |
285 | struct b43legacy_pio_txpacket *packet, *tmp_packet; | |
286 | int err; | |
287 | u16 txctl; | |
288 | ||
289 | spin_lock_irqsave(&dev->wl->irq_lock, flags); | |
290 | if (queue->tx_frozen) | |
291 | goto out_unlock; | |
292 | txctl = b43legacy_pio_read(queue, B43legacy_PIO_TXCTL); | |
293 | if (txctl & B43legacy_PIO_TXCTL_SUSPEND) | |
294 | goto out_unlock; | |
295 | ||
296 | list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) { | |
297 | /* Try to transmit the packet. This can fail, if | |
298 | * the device queue is full. In case of failure, the | |
299 | * packet is left in the txqueue. | |
300 | * If transmission succeed, the packet is moved to txrunning. | |
301 | * If it is impossible to transmit the packet, it | |
302 | * is dropped. | |
303 | */ | |
304 | err = pio_tx_packet(packet); | |
305 | if (err) | |
306 | break; | |
307 | } | |
308 | out_unlock: | |
309 | spin_unlock_irqrestore(&dev->wl->irq_lock, flags); | |
310 | } | |
311 | ||
312 | static void setup_txqueues(struct b43legacy_pioqueue *queue) | |
313 | { | |
314 | struct b43legacy_pio_txpacket *packet; | |
315 | int i; | |
316 | ||
317 | queue->nr_txfree = B43legacy_PIO_MAXTXPACKETS; | |
318 | for (i = 0; i < B43legacy_PIO_MAXTXPACKETS; i++) { | |
319 | packet = &(queue->tx_packets_cache[i]); | |
320 | ||
321 | packet->queue = queue; | |
322 | INIT_LIST_HEAD(&packet->list); | |
323 | ||
324 | list_add(&packet->list, &queue->txfree); | |
325 | } | |
326 | } | |
327 | ||
328 | static | |
329 | struct b43legacy_pioqueue *b43legacy_setup_pioqueue(struct b43legacy_wldev *dev, | |
330 | u16 pio_mmio_base) | |
331 | { | |
332 | struct b43legacy_pioqueue *queue; | |
333 | u32 value; | |
334 | u16 qsize; | |
335 | ||
336 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
337 | if (!queue) | |
338 | goto out; | |
339 | ||
340 | queue->dev = dev; | |
341 | queue->mmio_base = pio_mmio_base; | |
342 | queue->need_workarounds = (dev->dev->id.revision < 3); | |
343 | ||
344 | INIT_LIST_HEAD(&queue->txfree); | |
345 | INIT_LIST_HEAD(&queue->txqueue); | |
346 | INIT_LIST_HEAD(&queue->txrunning); | |
347 | tasklet_init(&queue->txtask, tx_tasklet, | |
348 | (unsigned long)queue); | |
349 | ||
e78c9d28 SB |
350 | value = b43legacy_read32(dev, B43legacy_MMIO_MACCTL); |
351 | value &= ~B43legacy_MACCTL_BE; | |
352 | b43legacy_write32(dev, B43legacy_MMIO_MACCTL, value); | |
75388acd LF |
353 | |
354 | qsize = b43legacy_read16(dev, queue->mmio_base | |
355 | + B43legacy_PIO_TXQBUFSIZE); | |
356 | if (qsize == 0) { | |
357 | b43legacyerr(dev->wl, "This card does not support PIO " | |
358 | "operation mode. Please use DMA mode " | |
359 | "(module parameter pio=0).\n"); | |
360 | goto err_freequeue; | |
361 | } | |
362 | if (qsize <= B43legacy_PIO_TXQADJUST) { | |
363 | b43legacyerr(dev->wl, "PIO tx device-queue too small (%u)\n", | |
364 | qsize); | |
365 | goto err_freequeue; | |
366 | } | |
367 | qsize -= B43legacy_PIO_TXQADJUST; | |
368 | queue->tx_devq_size = qsize; | |
369 | ||
370 | setup_txqueues(queue); | |
371 | ||
372 | out: | |
373 | return queue; | |
374 | ||
375 | err_freequeue: | |
376 | kfree(queue); | |
377 | queue = NULL; | |
378 | goto out; | |
379 | } | |
380 | ||
381 | static void cancel_transfers(struct b43legacy_pioqueue *queue) | |
382 | { | |
383 | struct b43legacy_pio_txpacket *packet, *tmp_packet; | |
384 | ||
385 | tasklet_disable(&queue->txtask); | |
386 | ||
387 | list_for_each_entry_safe(packet, tmp_packet, &queue->txrunning, list) | |
388 | free_txpacket(packet, 0); | |
389 | list_for_each_entry_safe(packet, tmp_packet, &queue->txqueue, list) | |
390 | free_txpacket(packet, 0); | |
391 | } | |
392 | ||
393 | static void b43legacy_destroy_pioqueue(struct b43legacy_pioqueue *queue) | |
394 | { | |
395 | if (!queue) | |
396 | return; | |
397 | ||
398 | cancel_transfers(queue); | |
399 | kfree(queue); | |
400 | } | |
401 | ||
402 | void b43legacy_pio_free(struct b43legacy_wldev *dev) | |
403 | { | |
404 | struct b43legacy_pio *pio; | |
405 | ||
406 | if (!b43legacy_using_pio(dev)) | |
407 | return; | |
408 | pio = &dev->pio; | |
409 | ||
410 | b43legacy_destroy_pioqueue(pio->queue3); | |
411 | pio->queue3 = NULL; | |
412 | b43legacy_destroy_pioqueue(pio->queue2); | |
413 | pio->queue2 = NULL; | |
414 | b43legacy_destroy_pioqueue(pio->queue1); | |
415 | pio->queue1 = NULL; | |
416 | b43legacy_destroy_pioqueue(pio->queue0); | |
417 | pio->queue0 = NULL; | |
418 | } | |
419 | ||
420 | int b43legacy_pio_init(struct b43legacy_wldev *dev) | |
421 | { | |
422 | struct b43legacy_pio *pio = &dev->pio; | |
423 | struct b43legacy_pioqueue *queue; | |
424 | int err = -ENOMEM; | |
425 | ||
426 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO1_BASE); | |
427 | if (!queue) | |
428 | goto out; | |
429 | pio->queue0 = queue; | |
430 | ||
431 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO2_BASE); | |
432 | if (!queue) | |
433 | goto err_destroy0; | |
434 | pio->queue1 = queue; | |
435 | ||
436 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO3_BASE); | |
437 | if (!queue) | |
438 | goto err_destroy1; | |
439 | pio->queue2 = queue; | |
440 | ||
441 | queue = b43legacy_setup_pioqueue(dev, B43legacy_MMIO_PIO4_BASE); | |
442 | if (!queue) | |
443 | goto err_destroy2; | |
444 | pio->queue3 = queue; | |
445 | ||
446 | if (dev->dev->id.revision < 3) | |
44710bbc | 447 | dev->irq_mask |= B43legacy_IRQ_PIO_WORKAROUND; |
75388acd LF |
448 | |
449 | b43legacydbg(dev->wl, "PIO initialized\n"); | |
450 | err = 0; | |
451 | out: | |
452 | return err; | |
453 | ||
454 | err_destroy2: | |
455 | b43legacy_destroy_pioqueue(pio->queue2); | |
456 | pio->queue2 = NULL; | |
457 | err_destroy1: | |
458 | b43legacy_destroy_pioqueue(pio->queue1); | |
459 | pio->queue1 = NULL; | |
460 | err_destroy0: | |
461 | b43legacy_destroy_pioqueue(pio->queue0); | |
462 | pio->queue0 = NULL; | |
463 | goto out; | |
464 | } | |
465 | ||
466 | int b43legacy_pio_tx(struct b43legacy_wldev *dev, | |
e039fa4a | 467 | struct sk_buff *skb) |
75388acd LF |
468 | { |
469 | struct b43legacy_pioqueue *queue = dev->pio.queue1; | |
470 | struct b43legacy_pio_txpacket *packet; | |
471 | ||
472 | B43legacy_WARN_ON(queue->tx_suspended); | |
473 | B43legacy_WARN_ON(list_empty(&queue->txfree)); | |
474 | ||
475 | packet = list_entry(queue->txfree.next, struct b43legacy_pio_txpacket, | |
476 | list); | |
477 | packet->skb = skb; | |
478 | ||
75388acd LF |
479 | list_move_tail(&packet->list, &queue->txqueue); |
480 | queue->nr_txfree--; | |
75388acd LF |
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; |
e6a9854b | 494 | int retry_limit; |
75388acd LF |
495 | |
496 | queue = parse_cookie(dev, status->cookie, &packet); | |
497 | B43legacy_WARN_ON(!queue); | |
498 | ||
0cd67d48 SB |
499 | if (!packet->skb) |
500 | return; | |
501 | ||
75388acd LF |
502 | queue->tx_devq_packets--; |
503 | queue->tx_devq_used -= (packet->skb->len + | |
504 | sizeof(struct b43legacy_txhdr_fw3)); | |
505 | ||
e039fa4a | 506 | info = IEEE80211_SKB_CB(packet->skb); |
e6a9854b JB |
507 | |
508 | /* preserve the confiured retry limit before clearing the status | |
509 | * The xmit function has overwritten the rc's value with the actual | |
510 | * retry limit done by the hardware */ | |
511 | retry_limit = info->status.rates[0].count; | |
512 | ieee80211_tx_info_clear_status(info); | |
e039fa4a | 513 | |
75388acd | 514 | if (status->acked) |
e039fa4a | 515 | info->flags |= IEEE80211_TX_STAT_ACK; |
e6a9854b JB |
516 | |
517 | if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) { | |
518 | /* | |
519 | * If the short retries (RTS, not data frame) have exceeded | |
520 | * the limit, the hw will not have tried the selected rate, | |
521 | * but will have used the fallback rate instead. | |
522 | * Don't let the rate control count attempts for the selected | |
523 | * rate in this case, otherwise the statistics will be off. | |
524 | */ | |
525 | info->status.rates[0].count = 0; | |
526 | info->status.rates[1].count = status->frame_count; | |
527 | } else { | |
528 | if (status->frame_count > retry_limit) { | |
529 | info->status.rates[0].count = retry_limit; | |
530 | info->status.rates[1].count = status->frame_count - | |
531 | retry_limit; | |
532 | ||
533 | } else { | |
534 | info->status.rates[0].count = status->frame_count; | |
535 | info->status.rates[1].idx = -1; | |
536 | } | |
537 | } | |
e039fa4a | 538 | ieee80211_tx_status_irqsafe(dev->wl->hw, packet->skb); |
75388acd LF |
539 | packet->skb = NULL; |
540 | ||
541 | free_txpacket(packet, 1); | |
542 | /* If there are packets on the txqueue, poke the tasklet | |
543 | * to transmit them. | |
544 | */ | |
545 | if (!list_empty(&queue->txqueue)) | |
546 | tasklet_schedule(&queue->txtask); | |
547 | } | |
548 | ||
75388acd LF |
549 | static void pio_rx_error(struct b43legacy_pioqueue *queue, |
550 | int clear_buffers, | |
551 | const char *error) | |
552 | { | |
553 | int i; | |
554 | ||
555 | b43legacyerr(queue->dev->wl, "PIO RX error: %s\n", error); | |
556 | b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, | |
557 | B43legacy_PIO_RXCTL_READY); | |
558 | if (clear_buffers) { | |
559 | B43legacy_WARN_ON(queue->mmio_base != B43legacy_MMIO_PIO1_BASE); | |
560 | for (i = 0; i < 15; i++) { | |
561 | /* Dummy read. */ | |
562 | b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
563 | } | |
564 | } | |
565 | } | |
566 | ||
567 | void b43legacy_pio_rx(struct b43legacy_pioqueue *queue) | |
568 | { | |
569 | __le16 preamble[21] = { 0 }; | |
570 | struct b43legacy_rxhdr_fw3 *rxhdr; | |
571 | u16 tmp; | |
572 | u16 len; | |
573 | u16 macstat; | |
574 | int i; | |
575 | int preamble_readwords; | |
576 | struct sk_buff *skb; | |
577 | ||
578 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); | |
579 | if (!(tmp & B43legacy_PIO_RXCTL_DATAAVAILABLE)) | |
580 | return; | |
581 | b43legacy_pio_write(queue, B43legacy_PIO_RXCTL, | |
582 | B43legacy_PIO_RXCTL_DATAAVAILABLE); | |
583 | ||
584 | for (i = 0; i < 10; i++) { | |
585 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXCTL); | |
586 | if (tmp & B43legacy_PIO_RXCTL_READY) | |
587 | goto data_ready; | |
588 | udelay(10); | |
589 | } | |
590 | b43legacydbg(queue->dev->wl, "PIO RX timed out\n"); | |
591 | return; | |
592 | data_ready: | |
593 | ||
594 | len = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
595 | if (unlikely(len > 0x700)) { | |
596 | pio_rx_error(queue, 0, "len > 0x700"); | |
597 | return; | |
598 | } | |
599 | if (unlikely(len == 0 && queue->mmio_base != | |
600 | B43legacy_MMIO_PIO4_BASE)) { | |
601 | pio_rx_error(queue, 0, "len == 0"); | |
602 | return; | |
603 | } | |
604 | preamble[0] = cpu_to_le16(len); | |
605 | if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) | |
606 | preamble_readwords = 14 / sizeof(u16); | |
607 | else | |
608 | preamble_readwords = 18 / sizeof(u16); | |
609 | for (i = 0; i < preamble_readwords; i++) { | |
610 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
611 | preamble[i + 1] = cpu_to_le16(tmp); | |
612 | } | |
613 | rxhdr = (struct b43legacy_rxhdr_fw3 *)preamble; | |
614 | macstat = le16_to_cpu(rxhdr->mac_status); | |
615 | if (macstat & B43legacy_RX_MAC_FCSERR) { | |
616 | pio_rx_error(queue, | |
617 | (queue->mmio_base == B43legacy_MMIO_PIO1_BASE), | |
618 | "Frame FCS error"); | |
619 | return; | |
620 | } | |
621 | if (queue->mmio_base == B43legacy_MMIO_PIO4_BASE) { | |
622 | /* We received an xmit status. */ | |
623 | struct b43legacy_hwtxstatus *hw; | |
624 | ||
625 | hw = (struct b43legacy_hwtxstatus *)(preamble + 1); | |
626 | b43legacy_handle_hwtxstatus(queue->dev, hw); | |
627 | ||
628 | return; | |
629 | } | |
630 | ||
631 | skb = dev_alloc_skb(len); | |
632 | if (unlikely(!skb)) { | |
633 | pio_rx_error(queue, 1, "OOM"); | |
634 | return; | |
635 | } | |
636 | skb_put(skb, len); | |
637 | for (i = 0; i < len - 1; i += 2) { | |
638 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
639 | *((__le16 *)(skb->data + i)) = cpu_to_le16(tmp); | |
640 | } | |
641 | if (len % 2) { | |
642 | tmp = b43legacy_pio_read(queue, B43legacy_PIO_RXDATA); | |
643 | skb->data[len - 1] = (tmp & 0x00FF); | |
644 | } | |
645 | b43legacy_rx(queue->dev, skb, rxhdr); | |
646 | } | |
647 | ||
648 | void b43legacy_pio_tx_suspend(struct b43legacy_pioqueue *queue) | |
649 | { | |
650 | b43legacy_power_saving_ctl_bits(queue->dev, -1, 1); | |
651 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
652 | b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) | |
653 | | B43legacy_PIO_TXCTL_SUSPEND); | |
654 | } | |
655 | ||
656 | void b43legacy_pio_tx_resume(struct b43legacy_pioqueue *queue) | |
657 | { | |
658 | b43legacy_pio_write(queue, B43legacy_PIO_TXCTL, | |
659 | b43legacy_pio_read(queue, B43legacy_PIO_TXCTL) | |
660 | & ~B43legacy_PIO_TXCTL_SUSPEND); | |
661 | b43legacy_power_saving_ctl_bits(queue->dev, -1, -1); | |
662 | tasklet_schedule(&queue->txtask); | |
663 | } | |
664 | ||
665 | void b43legacy_pio_freeze_txqueues(struct b43legacy_wldev *dev) | |
666 | { | |
667 | struct b43legacy_pio *pio; | |
668 | ||
669 | B43legacy_WARN_ON(!b43legacy_using_pio(dev)); | |
670 | pio = &dev->pio; | |
671 | pio->queue0->tx_frozen = 1; | |
672 | pio->queue1->tx_frozen = 1; | |
673 | pio->queue2->tx_frozen = 1; | |
674 | pio->queue3->tx_frozen = 1; | |
675 | } | |
676 | ||
677 | void b43legacy_pio_thaw_txqueues(struct b43legacy_wldev *dev) | |
678 | { | |
679 | struct b43legacy_pio *pio; | |
680 | ||
681 | B43legacy_WARN_ON(!b43legacy_using_pio(dev)); | |
682 | pio = &dev->pio; | |
683 | pio->queue0->tx_frozen = 0; | |
684 | pio->queue1->tx_frozen = 0; | |
685 | pio->queue2->tx_frozen = 0; | |
686 | pio->queue3->tx_frozen = 0; | |
687 | if (!list_empty(&pio->queue0->txqueue)) | |
688 | tasklet_schedule(&pio->queue0->txtask); | |
689 | if (!list_empty(&pio->queue1->txqueue)) | |
690 | tasklet_schedule(&pio->queue1->txtask); | |
691 | if (!list_empty(&pio->queue2->txqueue)) | |
692 | tasklet_schedule(&pio->queue2->txtask); | |
693 | if (!list_empty(&pio->queue3->txqueue)) | |
694 | tasklet_schedule(&pio->queue3->txtask); | |
695 | } |