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Commit | Line | Data |
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5100d5ac MB |
1 | /* |
2 | ||
3 | Broadcom B43 wireless driver | |
4 | ||
5 | PIO data transfer | |
6 | ||
7 | Copyright (c) 2005-2008 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 "b43.h" | |
27 | #include "pio.h" | |
28 | #include "dma.h" | |
29 | #include "main.h" | |
30 | #include "xmit.h" | |
31 | ||
32 | #include <linux/delay.h> | |
33 | ||
34 | ||
35 | static void b43_pio_rx_work(struct work_struct *work); | |
36 | ||
37 | ||
38 | static u16 generate_cookie(struct b43_pio_txqueue *q, | |
39 | struct b43_pio_txpacket *pack) | |
40 | { | |
41 | u16 cookie; | |
42 | ||
43 | /* Use the upper 4 bits of the cookie as | |
44 | * PIO controller ID and store the packet index number | |
45 | * in the lower 12 bits. | |
46 | * Note that the cookie must never be 0, as this | |
47 | * is a special value used in RX path. | |
48 | * It can also not be 0xFFFF because that is special | |
49 | * for multicast frames. | |
50 | */ | |
51 | cookie = (((u16)q->index + 1) << 12); | |
52 | cookie |= pack->index; | |
53 | ||
54 | return cookie; | |
55 | } | |
56 | ||
57 | static | |
58 | struct b43_pio_txqueue * parse_cookie(struct b43_wldev *dev, | |
59 | u16 cookie, | |
60 | struct b43_pio_txpacket **pack) | |
61 | { | |
62 | struct b43_pio *pio = &dev->pio; | |
63 | struct b43_pio_txqueue *q = NULL; | |
64 | unsigned int pack_index; | |
65 | ||
66 | switch (cookie & 0xF000) { | |
67 | case 0x1000: | |
68 | q = pio->tx_queue_AC_BK; | |
69 | break; | |
70 | case 0x2000: | |
71 | q = pio->tx_queue_AC_BE; | |
72 | break; | |
73 | case 0x3000: | |
74 | q = pio->tx_queue_AC_VI; | |
75 | break; | |
76 | case 0x4000: | |
77 | q = pio->tx_queue_AC_VO; | |
78 | break; | |
79 | case 0x5000: | |
80 | q = pio->tx_queue_mcast; | |
81 | break; | |
82 | } | |
83 | if (B43_WARN_ON(!q)) | |
84 | return NULL; | |
85 | pack_index = (cookie & 0x0FFF); | |
86 | if (B43_WARN_ON(pack_index >= ARRAY_SIZE(q->packets))) | |
87 | return NULL; | |
88 | *pack = &q->packets[pack_index]; | |
89 | ||
90 | return q; | |
91 | } | |
92 | ||
93 | static u16 index_to_pioqueue_base(struct b43_wldev *dev, | |
94 | unsigned int index) | |
95 | { | |
96 | static const u16 bases[] = { | |
97 | B43_MMIO_PIO_BASE0, | |
98 | B43_MMIO_PIO_BASE1, | |
99 | B43_MMIO_PIO_BASE2, | |
100 | B43_MMIO_PIO_BASE3, | |
101 | B43_MMIO_PIO_BASE4, | |
102 | B43_MMIO_PIO_BASE5, | |
103 | B43_MMIO_PIO_BASE6, | |
104 | B43_MMIO_PIO_BASE7, | |
105 | }; | |
106 | static const u16 bases_rev11[] = { | |
107 | B43_MMIO_PIO11_BASE0, | |
108 | B43_MMIO_PIO11_BASE1, | |
109 | B43_MMIO_PIO11_BASE2, | |
110 | B43_MMIO_PIO11_BASE3, | |
111 | B43_MMIO_PIO11_BASE4, | |
112 | B43_MMIO_PIO11_BASE5, | |
113 | }; | |
114 | ||
115 | if (dev->dev->id.revision >= 11) { | |
116 | B43_WARN_ON(index >= ARRAY_SIZE(bases_rev11)); | |
117 | return bases_rev11[index]; | |
118 | } | |
119 | B43_WARN_ON(index >= ARRAY_SIZE(bases)); | |
120 | return bases[index]; | |
121 | } | |
122 | ||
123 | static u16 pio_txqueue_offset(struct b43_wldev *dev) | |
124 | { | |
125 | if (dev->dev->id.revision >= 11) | |
126 | return 0x18; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static u16 pio_rxqueue_offset(struct b43_wldev *dev) | |
131 | { | |
132 | if (dev->dev->id.revision >= 11) | |
133 | return 0x38; | |
134 | return 8; | |
135 | } | |
136 | ||
137 | static struct b43_pio_txqueue * b43_setup_pioqueue_tx(struct b43_wldev *dev, | |
138 | unsigned int index) | |
139 | { | |
140 | struct b43_pio_txqueue *q; | |
141 | struct b43_pio_txpacket *p; | |
142 | unsigned int i; | |
143 | ||
144 | q = kzalloc(sizeof(*q), GFP_KERNEL); | |
145 | if (!q) | |
146 | return NULL; | |
147 | spin_lock_init(&q->lock); | |
148 | q->dev = dev; | |
149 | q->rev = dev->dev->id.revision; | |
150 | q->mmio_base = index_to_pioqueue_base(dev, index) + | |
151 | pio_txqueue_offset(dev); | |
152 | q->index = index; | |
153 | ||
154 | q->free_packet_slots = B43_PIO_MAX_NR_TXPACKETS; | |
155 | if (q->rev >= 8) { | |
156 | q->buffer_size = 1920; //FIXME this constant is wrong. | |
157 | } else { | |
158 | q->buffer_size = b43_piotx_read16(q, B43_PIO_TXQBUFSIZE); | |
159 | q->buffer_size -= 80; | |
160 | } | |
161 | ||
162 | INIT_LIST_HEAD(&q->packets_list); | |
163 | for (i = 0; i < ARRAY_SIZE(q->packets); i++) { | |
164 | p = &(q->packets[i]); | |
165 | INIT_LIST_HEAD(&p->list); | |
166 | p->index = i; | |
167 | p->queue = q; | |
168 | list_add(&p->list, &q->packets_list); | |
169 | } | |
170 | ||
171 | return q; | |
172 | } | |
173 | ||
174 | static struct b43_pio_rxqueue * b43_setup_pioqueue_rx(struct b43_wldev *dev, | |
175 | unsigned int index) | |
176 | { | |
177 | struct b43_pio_rxqueue *q; | |
178 | ||
179 | q = kzalloc(sizeof(*q), GFP_KERNEL); | |
180 | if (!q) | |
181 | return NULL; | |
182 | spin_lock_init(&q->lock); | |
183 | q->dev = dev; | |
184 | q->rev = dev->dev->id.revision; | |
185 | q->mmio_base = index_to_pioqueue_base(dev, index) + | |
186 | pio_rxqueue_offset(dev); | |
187 | INIT_WORK(&q->rx_work, b43_pio_rx_work); | |
188 | ||
189 | /* Enable Direct FIFO RX (PIO) on the engine. */ | |
190 | b43_dma_direct_fifo_rx(dev, index, 1); | |
191 | ||
192 | return q; | |
193 | } | |
194 | ||
195 | static void b43_pio_cancel_tx_packets(struct b43_pio_txqueue *q) | |
196 | { | |
197 | struct b43_pio_txpacket *pack; | |
198 | unsigned int i; | |
199 | ||
200 | for (i = 0; i < ARRAY_SIZE(q->packets); i++) { | |
201 | pack = &(q->packets[i]); | |
202 | if (pack->skb) { | |
203 | dev_kfree_skb_any(pack->skb); | |
204 | pack->skb = NULL; | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | static void b43_destroy_pioqueue_tx(struct b43_pio_txqueue *q, | |
210 | const char *name) | |
211 | { | |
212 | if (!q) | |
213 | return; | |
214 | b43_pio_cancel_tx_packets(q); | |
215 | kfree(q); | |
216 | } | |
217 | ||
218 | static void b43_destroy_pioqueue_rx(struct b43_pio_rxqueue *q, | |
219 | const char *name) | |
220 | { | |
221 | if (!q) | |
222 | return; | |
223 | kfree(q); | |
224 | } | |
225 | ||
226 | #define destroy_queue_tx(pio, queue) do { \ | |
227 | b43_destroy_pioqueue_tx((pio)->queue, __stringify(queue)); \ | |
228 | (pio)->queue = NULL; \ | |
229 | } while (0) | |
230 | ||
231 | #define destroy_queue_rx(pio, queue) do { \ | |
232 | b43_destroy_pioqueue_rx((pio)->queue, __stringify(queue)); \ | |
233 | (pio)->queue = NULL; \ | |
234 | } while (0) | |
235 | ||
236 | void b43_pio_free(struct b43_wldev *dev) | |
237 | { | |
238 | struct b43_pio *pio; | |
239 | ||
240 | if (!b43_using_pio_transfers(dev)) | |
241 | return; | |
242 | pio = &dev->pio; | |
243 | ||
244 | destroy_queue_rx(pio, rx_queue); | |
245 | destroy_queue_tx(pio, tx_queue_mcast); | |
246 | destroy_queue_tx(pio, tx_queue_AC_VO); | |
247 | destroy_queue_tx(pio, tx_queue_AC_VI); | |
248 | destroy_queue_tx(pio, tx_queue_AC_BE); | |
249 | destroy_queue_tx(pio, tx_queue_AC_BK); | |
250 | } | |
251 | ||
252 | void b43_pio_stop(struct b43_wldev *dev) | |
253 | { | |
254 | if (!b43_using_pio_transfers(dev)) | |
255 | return; | |
256 | cancel_work_sync(&dev->pio.rx_queue->rx_work); | |
257 | } | |
258 | ||
259 | int b43_pio_init(struct b43_wldev *dev) | |
260 | { | |
261 | struct b43_pio *pio = &dev->pio; | |
262 | int err = -ENOMEM; | |
263 | ||
264 | b43_write32(dev, B43_MMIO_MACCTL, b43_read32(dev, B43_MMIO_MACCTL) | |
265 | & ~B43_MACCTL_BE); | |
266 | b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_RXPADOFF, 0); | |
267 | ||
268 | pio->tx_queue_AC_BK = b43_setup_pioqueue_tx(dev, 0); | |
269 | if (!pio->tx_queue_AC_BK) | |
270 | goto out; | |
271 | ||
272 | pio->tx_queue_AC_BE = b43_setup_pioqueue_tx(dev, 1); | |
273 | if (!pio->tx_queue_AC_BE) | |
274 | goto err_destroy_bk; | |
275 | ||
276 | pio->tx_queue_AC_VI = b43_setup_pioqueue_tx(dev, 2); | |
277 | if (!pio->tx_queue_AC_VI) | |
278 | goto err_destroy_be; | |
279 | ||
280 | pio->tx_queue_AC_VO = b43_setup_pioqueue_tx(dev, 3); | |
281 | if (!pio->tx_queue_AC_VO) | |
282 | goto err_destroy_vi; | |
283 | ||
284 | pio->tx_queue_mcast = b43_setup_pioqueue_tx(dev, 4); | |
285 | if (!pio->tx_queue_mcast) | |
286 | goto err_destroy_vo; | |
287 | ||
288 | pio->rx_queue = b43_setup_pioqueue_rx(dev, 0); | |
289 | if (!pio->rx_queue) | |
290 | goto err_destroy_mcast; | |
291 | ||
292 | b43dbg(dev->wl, "PIO initialized\n"); | |
293 | err = 0; | |
294 | out: | |
295 | return err; | |
296 | ||
297 | err_destroy_mcast: | |
298 | destroy_queue_tx(pio, tx_queue_mcast); | |
299 | err_destroy_vo: | |
300 | destroy_queue_tx(pio, tx_queue_AC_VO); | |
301 | err_destroy_vi: | |
302 | destroy_queue_tx(pio, tx_queue_AC_VI); | |
303 | err_destroy_be: | |
304 | destroy_queue_tx(pio, tx_queue_AC_BE); | |
305 | err_destroy_bk: | |
306 | destroy_queue_tx(pio, tx_queue_AC_BK); | |
307 | return err; | |
308 | } | |
309 | ||
310 | /* Static mapping of mac80211's queues (priorities) to b43 PIO queues. */ | |
311 | static struct b43_pio_txqueue * select_queue_by_priority(struct b43_wldev *dev, | |
312 | u8 queue_prio) | |
313 | { | |
314 | struct b43_pio_txqueue *q; | |
315 | ||
316 | if (b43_modparam_qos) { | |
317 | /* 0 = highest priority */ | |
318 | switch (queue_prio) { | |
319 | default: | |
320 | B43_WARN_ON(1); | |
321 | /* fallthrough */ | |
322 | case 0: | |
323 | q = dev->pio.tx_queue_AC_VO; | |
324 | break; | |
325 | case 1: | |
326 | q = dev->pio.tx_queue_AC_VI; | |
327 | break; | |
328 | case 2: | |
329 | q = dev->pio.tx_queue_AC_BE; | |
330 | break; | |
331 | case 3: | |
332 | q = dev->pio.tx_queue_AC_BK; | |
333 | break; | |
334 | } | |
335 | } else | |
336 | q = dev->pio.tx_queue_AC_BE; | |
337 | ||
338 | return q; | |
339 | } | |
340 | ||
d8c17e15 MB |
341 | static u16 tx_write_2byte_queue(struct b43_pio_txqueue *q, |
342 | u16 ctl, | |
343 | const void *_data, | |
344 | unsigned int data_len) | |
5100d5ac | 345 | { |
d8c17e15 | 346 | struct b43_wldev *dev = q->dev; |
5100d5ac | 347 | const u8 *data = _data; |
d8c17e15 MB |
348 | |
349 | ctl |= B43_PIO_TXCTL_WRITELO | B43_PIO_TXCTL_WRITEHI; | |
350 | b43_piotx_write16(q, B43_PIO_TXCTL, ctl); | |
351 | ||
352 | ssb_block_write(dev->dev, data, (data_len & ~1), | |
353 | q->mmio_base + B43_PIO_TXDATA, | |
354 | sizeof(u16)); | |
355 | if (data_len & 1) { | |
356 | /* Write the last byte. */ | |
357 | ctl &= ~B43_PIO_TXCTL_WRITEHI; | |
358 | b43_piotx_write16(q, B43_PIO_TXCTL, ctl); | |
359 | b43_piotx_write16(q, B43_PIO_TXDATA, data[data_len - 1]); | |
5100d5ac | 360 | } |
d8c17e15 MB |
361 | |
362 | return ctl; | |
5100d5ac MB |
363 | } |
364 | ||
365 | static void pio_tx_frame_2byte_queue(struct b43_pio_txpacket *pack, | |
366 | const u8 *hdr, unsigned int hdrlen) | |
367 | { | |
368 | struct b43_pio_txqueue *q = pack->queue; | |
369 | const char *frame = pack->skb->data; | |
370 | unsigned int frame_len = pack->skb->len; | |
371 | u16 ctl; | |
372 | ||
373 | ctl = b43_piotx_read16(q, B43_PIO_TXCTL); | |
374 | ctl |= B43_PIO_TXCTL_FREADY; | |
375 | ctl &= ~B43_PIO_TXCTL_EOF; | |
376 | ||
377 | /* Transfer the header data. */ | |
d8c17e15 | 378 | ctl = tx_write_2byte_queue(q, ctl, hdr, hdrlen); |
5100d5ac | 379 | /* Transfer the frame data. */ |
d8c17e15 | 380 | ctl = tx_write_2byte_queue(q, ctl, frame, frame_len); |
5100d5ac MB |
381 | |
382 | ctl |= B43_PIO_TXCTL_EOF; | |
383 | b43_piotx_write16(q, B43_PIO_TXCTL, ctl); | |
384 | } | |
385 | ||
d8c17e15 MB |
386 | static u32 tx_write_4byte_queue(struct b43_pio_txqueue *q, |
387 | u32 ctl, | |
388 | const void *_data, | |
389 | unsigned int data_len) | |
5100d5ac | 390 | { |
d8c17e15 | 391 | struct b43_wldev *dev = q->dev; |
5100d5ac | 392 | const u8 *data = _data; |
d8c17e15 MB |
393 | |
394 | ctl |= B43_PIO8_TXCTL_0_7 | B43_PIO8_TXCTL_8_15 | | |
395 | B43_PIO8_TXCTL_16_23 | B43_PIO8_TXCTL_24_31; | |
396 | b43_piotx_write32(q, B43_PIO8_TXCTL, ctl); | |
397 | ||
398 | ssb_block_write(dev->dev, data, (data_len & ~3), | |
399 | q->mmio_base + B43_PIO8_TXDATA, | |
400 | sizeof(u32)); | |
401 | if (data_len & 3) { | |
402 | u32 value = 0; | |
403 | ||
404 | /* Write the last few bytes. */ | |
405 | ctl &= ~(B43_PIO8_TXCTL_8_15 | B43_PIO8_TXCTL_16_23 | | |
406 | B43_PIO8_TXCTL_24_31); | |
407 | data = &(data[data_len - 1]); | |
408 | switch (data_len & 3) { | |
409 | case 3: | |
410 | ctl |= B43_PIO8_TXCTL_16_23; | |
411 | value |= (u32)(*data) << 16; | |
412 | data--; | |
413 | case 2: | |
414 | ctl |= B43_PIO8_TXCTL_8_15; | |
415 | value |= (u32)(*data) << 8; | |
416 | data--; | |
417 | case 1: | |
418 | value |= (u32)(*data); | |
5100d5ac | 419 | } |
d8c17e15 | 420 | b43_piotx_write32(q, B43_PIO8_TXCTL, ctl); |
5100d5ac MB |
421 | b43_piotx_write32(q, B43_PIO8_TXDATA, value); |
422 | } | |
d8c17e15 MB |
423 | |
424 | return ctl; | |
5100d5ac MB |
425 | } |
426 | ||
427 | static void pio_tx_frame_4byte_queue(struct b43_pio_txpacket *pack, | |
428 | const u8 *hdr, unsigned int hdrlen) | |
429 | { | |
430 | struct b43_pio_txqueue *q = pack->queue; | |
431 | const char *frame = pack->skb->data; | |
432 | unsigned int frame_len = pack->skb->len; | |
433 | u32 ctl; | |
434 | ||
435 | ctl = b43_piotx_read32(q, B43_PIO8_TXCTL); | |
436 | ctl |= B43_PIO8_TXCTL_FREADY; | |
437 | ctl &= ~B43_PIO8_TXCTL_EOF; | |
438 | ||
439 | /* Transfer the header data. */ | |
d8c17e15 | 440 | ctl = tx_write_4byte_queue(q, ctl, hdr, hdrlen); |
5100d5ac | 441 | /* Transfer the frame data. */ |
d8c17e15 | 442 | ctl = tx_write_4byte_queue(q, ctl, frame, frame_len); |
5100d5ac MB |
443 | |
444 | ctl |= B43_PIO8_TXCTL_EOF; | |
445 | b43_piotx_write32(q, B43_PIO_TXCTL, ctl); | |
446 | } | |
447 | ||
448 | static int pio_tx_frame(struct b43_pio_txqueue *q, | |
449 | struct sk_buff *skb, | |
450 | struct ieee80211_tx_control *ctl) | |
451 | { | |
452 | struct b43_pio_txpacket *pack; | |
453 | struct b43_txhdr txhdr; | |
454 | u16 cookie; | |
455 | int err; | |
456 | unsigned int hdrlen; | |
457 | ||
458 | B43_WARN_ON(list_empty(&q->packets_list)); | |
459 | pack = list_entry(q->packets_list.next, | |
460 | struct b43_pio_txpacket, list); | |
461 | memset(&pack->txstat, 0, sizeof(pack->txstat)); | |
462 | memcpy(&pack->txstat.control, ctl, sizeof(*ctl)); | |
463 | ||
464 | cookie = generate_cookie(q, pack); | |
465 | hdrlen = b43_txhdr_size(q->dev); | |
466 | err = b43_generate_txhdr(q->dev, (u8 *)&txhdr, skb->data, | |
467 | skb->len, ctl, cookie); | |
468 | if (err) | |
469 | return err; | |
470 | ||
471 | if (ctl->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM) { | |
472 | /* Tell the firmware about the cookie of the last | |
473 | * mcast frame, so it can clear the more-data bit in it. */ | |
474 | b43_shm_write16(q->dev, B43_SHM_SHARED, | |
475 | B43_SHM_SH_MCASTCOOKIE, cookie); | |
476 | } | |
477 | ||
478 | pack->skb = skb; | |
479 | if (q->rev >= 8) | |
480 | pio_tx_frame_4byte_queue(pack, (const u8 *)&txhdr, hdrlen); | |
481 | else | |
482 | pio_tx_frame_2byte_queue(pack, (const u8 *)&txhdr, hdrlen); | |
483 | ||
484 | /* Remove it from the list of available packet slots. | |
485 | * It will be put back when we receive the status report. */ | |
486 | list_del(&pack->list); | |
487 | ||
488 | /* Update the queue statistics. */ | |
489 | q->buffer_used += roundup(skb->len + hdrlen, 4); | |
490 | q->free_packet_slots -= 1; | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | int b43_pio_tx(struct b43_wldev *dev, | |
496 | struct sk_buff *skb, struct ieee80211_tx_control *ctl) | |
497 | { | |
498 | struct b43_pio_txqueue *q; | |
499 | struct ieee80211_hdr *hdr; | |
500 | unsigned long flags; | |
501 | unsigned int hdrlen, total_len; | |
502 | int err = 0; | |
503 | ||
504 | hdr = (struct ieee80211_hdr *)skb->data; | |
505 | if (ctl->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM) { | |
506 | /* The multicast queue will be sent after the DTIM. */ | |
507 | q = dev->pio.tx_queue_mcast; | |
508 | /* Set the frame More-Data bit. Ucode will clear it | |
509 | * for us on the last frame. */ | |
510 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
511 | } else { | |
512 | /* Decide by priority where to put this frame. */ | |
513 | q = select_queue_by_priority(dev, ctl->queue); | |
514 | } | |
515 | ||
516 | spin_lock_irqsave(&q->lock, flags); | |
517 | ||
518 | hdrlen = b43_txhdr_size(dev); | |
519 | total_len = roundup(skb->len + hdrlen, 4); | |
520 | ||
521 | if (unlikely(total_len > q->buffer_size)) { | |
522 | err = -ENOBUFS; | |
523 | b43dbg(dev->wl, "PIO: TX packet longer than queue.\n"); | |
524 | goto out_unlock; | |
525 | } | |
526 | if (unlikely(q->free_packet_slots == 0)) { | |
527 | err = -ENOBUFS; | |
528 | b43warn(dev->wl, "PIO: TX packet overflow.\n"); | |
529 | goto out_unlock; | |
530 | } | |
531 | B43_WARN_ON(q->buffer_used > q->buffer_size); | |
532 | ||
533 | if (total_len > (q->buffer_size - q->buffer_used)) { | |
534 | /* Not enough memory on the queue. */ | |
535 | err = -EBUSY; | |
536 | ieee80211_stop_queue(dev->wl->hw, ctl->queue); | |
537 | q->stopped = 1; | |
538 | goto out_unlock; | |
539 | } | |
540 | ||
541 | /* Assign the queue number to the ring (if not already done before) | |
542 | * so TX status handling can use it. The mac80211-queue to b43-queue | |
543 | * mapping is static, so we don't need to store it per frame. */ | |
544 | q->queue_prio = ctl->queue; | |
545 | ||
546 | err = pio_tx_frame(q, skb, ctl); | |
547 | if (unlikely(err == -ENOKEY)) { | |
548 | /* Drop this packet, as we don't have the encryption key | |
549 | * anymore and must not transmit it unencrypted. */ | |
550 | dev_kfree_skb_any(skb); | |
551 | err = 0; | |
552 | goto out_unlock; | |
553 | } | |
554 | if (unlikely(err)) { | |
555 | b43err(dev->wl, "PIO transmission failure\n"); | |
556 | goto out_unlock; | |
557 | } | |
558 | q->nr_tx_packets++; | |
559 | ||
560 | B43_WARN_ON(q->buffer_used > q->buffer_size); | |
561 | if (((q->buffer_size - q->buffer_used) < roundup(2 + 2 + 6, 4)) || | |
562 | (q->free_packet_slots == 0)) { | |
563 | /* The queue is full. */ | |
564 | ieee80211_stop_queue(dev->wl->hw, ctl->queue); | |
565 | q->stopped = 1; | |
566 | } | |
567 | ||
568 | out_unlock: | |
569 | spin_unlock_irqrestore(&q->lock, flags); | |
570 | ||
571 | return err; | |
572 | } | |
573 | ||
574 | /* Called with IRQs disabled. */ | |
575 | void b43_pio_handle_txstatus(struct b43_wldev *dev, | |
576 | const struct b43_txstatus *status) | |
577 | { | |
578 | struct b43_pio_txqueue *q; | |
579 | struct b43_pio_txpacket *pack = NULL; | |
580 | unsigned int total_len; | |
581 | ||
582 | q = parse_cookie(dev, status->cookie, &pack); | |
583 | if (unlikely(!q)) | |
584 | return; | |
585 | B43_WARN_ON(!pack); | |
586 | ||
587 | spin_lock(&q->lock); /* IRQs are already disabled. */ | |
588 | ||
589 | b43_fill_txstatus_report(&(pack->txstat), status); | |
590 | ||
591 | total_len = pack->skb->len + b43_txhdr_size(dev); | |
592 | total_len = roundup(total_len, 4); | |
593 | q->buffer_used -= total_len; | |
594 | q->free_packet_slots += 1; | |
595 | ||
596 | ieee80211_tx_status_irqsafe(dev->wl->hw, pack->skb, | |
597 | &(pack->txstat)); | |
598 | pack->skb = NULL; | |
599 | list_add(&pack->list, &q->packets_list); | |
600 | ||
601 | if (q->stopped) { | |
602 | ieee80211_wake_queue(dev->wl->hw, q->queue_prio); | |
603 | q->stopped = 0; | |
604 | } | |
605 | ||
606 | spin_unlock(&q->lock); | |
607 | } | |
608 | ||
609 | void b43_pio_get_tx_stats(struct b43_wldev *dev, | |
610 | struct ieee80211_tx_queue_stats *stats) | |
611 | { | |
612 | const int nr_queues = dev->wl->hw->queues; | |
613 | struct b43_pio_txqueue *q; | |
5100d5ac MB |
614 | unsigned long flags; |
615 | int i; | |
616 | ||
617 | for (i = 0; i < nr_queues; i++) { | |
5100d5ac MB |
618 | q = select_queue_by_priority(dev, i); |
619 | ||
620 | spin_lock_irqsave(&q->lock, flags); | |
57ffc589 JB |
621 | stats[i].len = B43_PIO_MAX_NR_TXPACKETS - q->free_packet_slots; |
622 | stats[i].limit = B43_PIO_MAX_NR_TXPACKETS; | |
623 | stats[i].count = q->nr_tx_packets; | |
5100d5ac MB |
624 | spin_unlock_irqrestore(&q->lock, flags); |
625 | } | |
626 | } | |
627 | ||
628 | /* Returns whether we should fetch another frame. */ | |
629 | static bool pio_rx_frame(struct b43_pio_rxqueue *q) | |
630 | { | |
d8c17e15 | 631 | struct b43_wldev *dev = q->dev; |
5100d5ac MB |
632 | struct b43_rxhdr_fw4 rxhdr; |
633 | u16 len; | |
634 | u32 macstat; | |
635 | unsigned int i, padding; | |
636 | struct sk_buff *skb; | |
637 | const char *err_msg = NULL; | |
638 | ||
639 | memset(&rxhdr, 0, sizeof(rxhdr)); | |
640 | ||
641 | /* Check if we have data and wait for it to get ready. */ | |
642 | if (q->rev >= 8) { | |
643 | u32 ctl; | |
644 | ||
645 | ctl = b43_piorx_read32(q, B43_PIO8_RXCTL); | |
646 | if (!(ctl & B43_PIO8_RXCTL_FRAMERDY)) | |
647 | return 0; | |
648 | b43_piorx_write32(q, B43_PIO8_RXCTL, | |
649 | B43_PIO8_RXCTL_FRAMERDY); | |
650 | for (i = 0; i < 10; i++) { | |
651 | ctl = b43_piorx_read32(q, B43_PIO8_RXCTL); | |
652 | if (ctl & B43_PIO8_RXCTL_DATARDY) | |
653 | goto data_ready; | |
654 | udelay(10); | |
655 | } | |
656 | } else { | |
657 | u16 ctl; | |
658 | ||
659 | ctl = b43_piorx_read16(q, B43_PIO_RXCTL); | |
660 | if (!(ctl & B43_PIO_RXCTL_FRAMERDY)) | |
661 | return 0; | |
662 | b43_piorx_write16(q, B43_PIO_RXCTL, | |
663 | B43_PIO_RXCTL_FRAMERDY); | |
664 | for (i = 0; i < 10; i++) { | |
665 | ctl = b43_piorx_read16(q, B43_PIO_RXCTL); | |
666 | if (ctl & B43_PIO_RXCTL_DATARDY) | |
667 | goto data_ready; | |
668 | udelay(10); | |
669 | } | |
670 | } | |
671 | b43dbg(q->dev->wl, "PIO RX timed out\n"); | |
672 | return 1; | |
673 | data_ready: | |
674 | ||
675 | /* Get the preamble (RX header) */ | |
676 | if (q->rev >= 8) { | |
d8c17e15 MB |
677 | ssb_block_read(dev->dev, &rxhdr, sizeof(rxhdr), |
678 | q->mmio_base + B43_PIO8_RXDATA, | |
679 | sizeof(u32)); | |
5100d5ac | 680 | } else { |
d8c17e15 MB |
681 | ssb_block_read(dev->dev, &rxhdr, sizeof(rxhdr), |
682 | q->mmio_base + B43_PIO_RXDATA, | |
683 | sizeof(u16)); | |
5100d5ac MB |
684 | } |
685 | /* Sanity checks. */ | |
686 | len = le16_to_cpu(rxhdr.frame_len); | |
687 | if (unlikely(len > 0x700)) { | |
688 | err_msg = "len > 0x700"; | |
689 | goto rx_error; | |
690 | } | |
691 | if (unlikely(len == 0)) { | |
692 | err_msg = "len == 0"; | |
693 | goto rx_error; | |
694 | } | |
695 | ||
696 | macstat = le32_to_cpu(rxhdr.mac_status); | |
697 | if (macstat & B43_RX_MAC_FCSERR) { | |
698 | if (!(q->dev->wl->filter_flags & FIF_FCSFAIL)) { | |
699 | /* Drop frames with failed FCS. */ | |
700 | err_msg = "Frame FCS error"; | |
701 | goto rx_error; | |
702 | } | |
703 | } | |
704 | ||
705 | /* We always pad 2 bytes, as that's what upstream code expects | |
706 | * due to the RX-header being 30 bytes. In case the frame is | |
707 | * unaligned, we pad another 2 bytes. */ | |
708 | padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0; | |
709 | skb = dev_alloc_skb(len + padding + 2); | |
710 | if (unlikely(!skb)) { | |
711 | err_msg = "Out of memory"; | |
712 | goto rx_error; | |
713 | } | |
714 | skb_reserve(skb, 2); | |
715 | skb_put(skb, len + padding); | |
716 | if (q->rev >= 8) { | |
d8c17e15 MB |
717 | ssb_block_read(dev->dev, skb->data + padding, (len & ~3), |
718 | q->mmio_base + B43_PIO8_RXDATA, | |
719 | sizeof(u32)); | |
720 | if (len & 3) { | |
721 | u32 value; | |
722 | char *data; | |
723 | ||
724 | /* Read the last few bytes. */ | |
5100d5ac | 725 | value = b43_piorx_read32(q, B43_PIO8_RXDATA); |
d8c17e15 MB |
726 | data = &(skb->data[len + padding - 1]); |
727 | switch (len & 3) { | |
728 | case 3: | |
729 | *data = (value >> 16); | |
730 | data--; | |
731 | case 2: | |
732 | *data = (value >> 8); | |
733 | data--; | |
734 | case 1: | |
735 | *data = value; | |
736 | } | |
5100d5ac MB |
737 | } |
738 | } else { | |
d8c17e15 MB |
739 | ssb_block_read(dev->dev, skb->data + padding, (len & ~1), |
740 | q->mmio_base + B43_PIO_RXDATA, | |
741 | sizeof(u16)); | |
742 | if (len & 1) { | |
743 | u16 value; | |
5100d5ac | 744 | |
d8c17e15 | 745 | /* Read the last byte. */ |
5100d5ac | 746 | value = b43_piorx_read16(q, B43_PIO_RXDATA); |
d8c17e15 | 747 | skb->data[len + padding - 1] = value; |
5100d5ac MB |
748 | } |
749 | } | |
750 | ||
751 | b43_rx(q->dev, skb, &rxhdr); | |
752 | ||
753 | return 1; | |
754 | ||
755 | rx_error: | |
756 | if (err_msg) | |
757 | b43dbg(q->dev->wl, "PIO RX error: %s\n", err_msg); | |
758 | b43_piorx_write16(q, B43_PIO_RXCTL, B43_PIO_RXCTL_DATARDY); | |
759 | return 1; | |
760 | } | |
761 | ||
762 | /* RX workqueue. We can sleep, yay! */ | |
763 | static void b43_pio_rx_work(struct work_struct *work) | |
764 | { | |
765 | struct b43_pio_rxqueue *q = container_of(work, struct b43_pio_rxqueue, | |
766 | rx_work); | |
767 | unsigned int budget = 50; | |
768 | bool stop; | |
769 | ||
770 | do { | |
771 | spin_lock_irq(&q->lock); | |
772 | stop = (pio_rx_frame(q) == 0); | |
773 | spin_unlock_irq(&q->lock); | |
774 | cond_resched(); | |
775 | if (stop) | |
776 | break; | |
777 | } while (--budget); | |
778 | } | |
779 | ||
780 | /* Called with IRQs disabled. */ | |
781 | void b43_pio_rx(struct b43_pio_rxqueue *q) | |
782 | { | |
783 | /* Due to latency issues we must run the RX path in | |
784 | * a workqueue to be able to schedule between packets. */ | |
785 | queue_work(q->dev->wl->hw->workqueue, &q->rx_work); | |
786 | } | |
787 | ||
788 | static void b43_pio_tx_suspend_queue(struct b43_pio_txqueue *q) | |
789 | { | |
790 | unsigned long flags; | |
791 | ||
792 | spin_lock_irqsave(&q->lock, flags); | |
793 | if (q->rev >= 8) { | |
794 | b43_piotx_write32(q, B43_PIO8_TXCTL, | |
795 | b43_piotx_read32(q, B43_PIO8_TXCTL) | |
796 | | B43_PIO8_TXCTL_SUSPREQ); | |
797 | } else { | |
798 | b43_piotx_write16(q, B43_PIO_TXCTL, | |
799 | b43_piotx_read16(q, B43_PIO_TXCTL) | |
800 | | B43_PIO_TXCTL_SUSPREQ); | |
801 | } | |
802 | spin_unlock_irqrestore(&q->lock, flags); | |
803 | } | |
804 | ||
805 | static void b43_pio_tx_resume_queue(struct b43_pio_txqueue *q) | |
806 | { | |
807 | unsigned long flags; | |
808 | ||
809 | spin_lock_irqsave(&q->lock, flags); | |
810 | if (q->rev >= 8) { | |
811 | b43_piotx_write32(q, B43_PIO8_TXCTL, | |
812 | b43_piotx_read32(q, B43_PIO8_TXCTL) | |
813 | & ~B43_PIO8_TXCTL_SUSPREQ); | |
814 | } else { | |
815 | b43_piotx_write16(q, B43_PIO_TXCTL, | |
816 | b43_piotx_read16(q, B43_PIO_TXCTL) | |
817 | & ~B43_PIO_TXCTL_SUSPREQ); | |
818 | } | |
819 | spin_unlock_irqrestore(&q->lock, flags); | |
820 | } | |
821 | ||
822 | void b43_pio_tx_suspend(struct b43_wldev *dev) | |
823 | { | |
824 | b43_power_saving_ctl_bits(dev, B43_PS_AWAKE); | |
825 | b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_BK); | |
826 | b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_BE); | |
827 | b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_VI); | |
828 | b43_pio_tx_suspend_queue(dev->pio.tx_queue_AC_VO); | |
829 | b43_pio_tx_suspend_queue(dev->pio.tx_queue_mcast); | |
830 | } | |
831 | ||
832 | void b43_pio_tx_resume(struct b43_wldev *dev) | |
833 | { | |
834 | b43_pio_tx_resume_queue(dev->pio.tx_queue_mcast); | |
835 | b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_VO); | |
836 | b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_VI); | |
837 | b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_BE); | |
838 | b43_pio_tx_resume_queue(dev->pio.tx_queue_AC_BK); | |
839 | b43_power_saving_ctl_bits(dev, 0); | |
840 | } |