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include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / drivers / net / wireless / ath / ath9k / recv.c
blob9a4850154fb251246d07d6c3ae3935fb889769a7
1 /*
2 * Copyright (c) 2008-2011 Atheros Communications Inc.
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include <linux/dma-mapping.h>
18 #include "ath9k.h"
19 #include "ar9003_mac.h"
20
21 #define SKB_CB_ATHBUF(__skb) (*((struct ath_buf **)__skb->cb))
22
23 static inline bool ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta,
24 int mindelta, int main_rssi_avg,
25 int alt_rssi_avg, int pkt_count)
26 {
27 return (((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
28 (alt_rssi_avg > main_rssi_avg + maxdelta)) ||
29 (alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50);
30 }
31
32 static inline bool ath_ant_div_comb_alt_check(u8 div_group, int alt_ratio,
33 int curr_main_set, int curr_alt_set,
34 int alt_rssi_avg, int main_rssi_avg)
35 {
36 bool result = false;
37 switch (div_group) {
38 case 0:
39 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
40 result = true;
41 break;
42 case 1:
43 case 2:
44 if ((((curr_main_set == ATH_ANT_DIV_COMB_LNA2) &&
45 (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) &&
46 (alt_rssi_avg >= (main_rssi_avg - 5))) ||
47 ((curr_main_set == ATH_ANT_DIV_COMB_LNA1) &&
48 (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) &&
49 (alt_rssi_avg >= (main_rssi_avg - 2)))) &&
50 (alt_rssi_avg >= 4))
51 result = true;
52 else
53 result = false;
54 break;
55 }
56
57 return result;
58 }
59
60 static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
61 {
62 return sc->ps_enabled &&
63 (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_AUTOSLEEP);
64 }
65
66 /*
67 * Setup and link descriptors.
68 *
69 * 11N: we can no longer afford to self link the last descriptor.
70 * MAC acknowledges BA status as long as it copies frames to host
71 * buffer (or rx fifo). This can incorrectly acknowledge packets
72 * to a sender if last desc is self-linked.
73 */
74 static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf)
75 {
76 struct ath_hw *ah = sc->sc_ah;
77 struct ath_common *common = ath9k_hw_common(ah);
78 struct ath_desc *ds;
79 struct sk_buff *skb;
80
81 ATH_RXBUF_RESET(bf);
82
83 ds = bf->bf_desc;
84 ds->ds_link = 0; /* link to null */
85 ds->ds_data = bf->bf_buf_addr;
86
87 /* virtual addr of the beginning of the buffer. */
88 skb = bf->bf_mpdu;
89 BUG_ON(skb == NULL);
90 ds->ds_vdata = skb->data;
91
92 /*
93 * setup rx descriptors. The rx_bufsize here tells the hardware
94 * how much data it can DMA to us and that we are prepared
95 * to process
96 */
97 ath9k_hw_setuprxdesc(ah, ds,
98 common->rx_bufsize,
99 0);
100
101 if (sc->rx.rxlink == NULL)
102 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
103 else
104 *sc->rx.rxlink = bf->bf_daddr;
105
106 sc->rx.rxlink = &ds->ds_link;
107 }
108
109 static void ath_setdefantenna(struct ath_softc *sc, u32 antenna)
110 {
111 /* XXX block beacon interrupts */
112 ath9k_hw_setantenna(sc->sc_ah, antenna);
113 sc->rx.defant = antenna;
114 sc->rx.rxotherant = 0;
115 }
116
117 static void ath_opmode_init(struct ath_softc *sc)
118 {
119 struct ath_hw *ah = sc->sc_ah;
120 struct ath_common *common = ath9k_hw_common(ah);
121
122 u32 rfilt, mfilt[2];
123
124 /* configure rx filter */
125 rfilt = ath_calcrxfilter(sc);
126 ath9k_hw_setrxfilter(ah, rfilt);
127
128 /* configure bssid mask */
129 ath_hw_setbssidmask(common);
130
131 /* configure operational mode */
132 ath9k_hw_setopmode(ah);
133
134 /* calculate and install multicast filter */
135 mfilt[0] = mfilt[1] = ~0;
136 ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
137 }
138
139 static bool ath_rx_edma_buf_link(struct ath_softc *sc,
140 enum ath9k_rx_qtype qtype)
141 {
142 struct ath_hw *ah = sc->sc_ah;
143 struct ath_rx_edma *rx_edma;
144 struct sk_buff *skb;
145 struct ath_buf *bf;
146
147 rx_edma = &sc->rx.rx_edma[qtype];
148 if (skb_queue_len(&rx_edma->rx_fifo) >= rx_edma->rx_fifo_hwsize)
149 return false;
150
151 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
152 list_del_init(&bf->list);
153
154 skb = bf->bf_mpdu;
155
156 ATH_RXBUF_RESET(bf);
157 memset(skb->data, 0, ah->caps.rx_status_len);
158 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
159 ah->caps.rx_status_len, DMA_TO_DEVICE);
160
161 SKB_CB_ATHBUF(skb) = bf;
162 ath9k_hw_addrxbuf_edma(ah, bf->bf_buf_addr, qtype);
163 skb_queue_tail(&rx_edma->rx_fifo, skb);
164
165 return true;
166 }
167
168 static void ath_rx_addbuffer_edma(struct ath_softc *sc,
169 enum ath9k_rx_qtype qtype, int size)
170 {
171 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
172 u32 nbuf = 0;
173
174 if (list_empty(&sc->rx.rxbuf)) {
175 ath_dbg(common, ATH_DBG_QUEUE, "No free rx buf available\n");
176 return;
177 }
178
179 while (!list_empty(&sc->rx.rxbuf)) {
180 nbuf++;
181
182 if (!ath_rx_edma_buf_link(sc, qtype))
183 break;
184
185 if (nbuf >= size)
186 break;
187 }
188 }
189
190 static void ath_rx_remove_buffer(struct ath_softc *sc,
191 enum ath9k_rx_qtype qtype)
192 {
193 struct ath_buf *bf;
194 struct ath_rx_edma *rx_edma;
195 struct sk_buff *skb;
196
197 rx_edma = &sc->rx.rx_edma[qtype];
198
199 while ((skb = skb_dequeue(&rx_edma->rx_fifo)) != NULL) {
200 bf = SKB_CB_ATHBUF(skb);
201 BUG_ON(!bf);
202 list_add_tail(&bf->list, &sc->rx.rxbuf);
203 }
204 }
205
206 static void ath_rx_edma_cleanup(struct ath_softc *sc)
207 {
208 struct ath_buf *bf;
209
210 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
211 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
212
213 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
214 if (bf->bf_mpdu)
215 dev_kfree_skb_any(bf->bf_mpdu);
216 }
217
218 INIT_LIST_HEAD(&sc->rx.rxbuf);
219
220 kfree(sc->rx.rx_bufptr);
221 sc->rx.rx_bufptr = NULL;
222 }
223
224 static void ath_rx_edma_init_queue(struct ath_rx_edma *rx_edma, int size)
225 {
226 skb_queue_head_init(&rx_edma->rx_fifo);
227 skb_queue_head_init(&rx_edma->rx_buffers);
228 rx_edma->rx_fifo_hwsize = size;
229 }
230
231 static int ath_rx_edma_init(struct ath_softc *sc, int nbufs)
232 {
233 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
234 struct ath_hw *ah = sc->sc_ah;
235 struct sk_buff *skb;
236 struct ath_buf *bf;
237 int error = 0, i;
238 u32 size;
239
240 ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
241 ah->caps.rx_status_len);
242
243 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_LP],
244 ah->caps.rx_lp_qdepth);
245 ath_rx_edma_init_queue(&sc->rx.rx_edma[ATH9K_RX_QUEUE_HP],
246 ah->caps.rx_hp_qdepth);
247
248 size = sizeof(struct ath_buf) * nbufs;
249 bf = kzalloc(size, GFP_KERNEL);
250 if (!bf)
251 return -ENOMEM;
252
253 INIT_LIST_HEAD(&sc->rx.rxbuf);
254 sc->rx.rx_bufptr = bf;
255
256 for (i = 0; i < nbufs; i++, bf++) {
257 skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_KERNEL);
258 if (!skb) {
259 error = -ENOMEM;
260 goto rx_init_fail;
261 }
262
263 memset(skb->data, 0, common->rx_bufsize);
264 bf->bf_mpdu = skb;
265
266 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
267 common->rx_bufsize,
268 DMA_BIDIRECTIONAL);
269 if (unlikely(dma_mapping_error(sc->dev,
270 bf->bf_buf_addr))) {
271 dev_kfree_skb_any(skb);
272 bf->bf_mpdu = NULL;
273 bf->bf_buf_addr = 0;
274 ath_err(common,
275 "dma_mapping_error() on RX init\n");
276 error = -ENOMEM;
277 goto rx_init_fail;
278 }
279
280 list_add_tail(&bf->list, &sc->rx.rxbuf);
281 }
282
283 return 0;
284
285 rx_init_fail:
286 ath_rx_edma_cleanup(sc);
287 return error;
288 }
289
290 static void ath_edma_start_recv(struct ath_softc *sc)
291 {
292 spin_lock_bh(&sc->rx.rxbuflock);
293
294 ath9k_hw_rxena(sc->sc_ah);
295
296 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_HP,
297 sc->rx.rx_edma[ATH9K_RX_QUEUE_HP].rx_fifo_hwsize);
298
299 ath_rx_addbuffer_edma(sc, ATH9K_RX_QUEUE_LP,
300 sc->rx.rx_edma[ATH9K_RX_QUEUE_LP].rx_fifo_hwsize);
301
302 ath_opmode_init(sc);
303
304 ath9k_hw_startpcureceive(sc->sc_ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
305
306 spin_unlock_bh(&sc->rx.rxbuflock);
307 }
308
309 static void ath_edma_stop_recv(struct ath_softc *sc)
310 {
311 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_HP);
312 ath_rx_remove_buffer(sc, ATH9K_RX_QUEUE_LP);
313 }
314
315 int ath_rx_init(struct ath_softc *sc, int nbufs)
316 {
317 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
318 struct sk_buff *skb;
319 struct ath_buf *bf;
320 int error = 0;
321
322 spin_lock_init(&sc->sc_pcu_lock);
323 sc->sc_flags &= ~SC_OP_RXFLUSH;
324 spin_lock_init(&sc->rx.rxbuflock);
325
326 common->rx_bufsize = IEEE80211_MAX_MPDU_LEN / 2 +
327 sc->sc_ah->caps.rx_status_len;
328
329 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
330 return ath_rx_edma_init(sc, nbufs);
331 } else {
332 ath_dbg(common, ATH_DBG_CONFIG, "cachelsz %u rxbufsize %u\n",
333 common->cachelsz, common->rx_bufsize);
334
335 /* Initialize rx descriptors */
336
337 error = ath_descdma_setup(sc, &sc->rx.rxdma, &sc->rx.rxbuf,
338 "rx", nbufs, 1, 0);
339 if (error != 0) {
340 ath_err(common,
341 "failed to allocate rx descriptors: %d\n",
342 error);
343 goto err;
344 }
345
346 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
347 skb = ath_rxbuf_alloc(common, common->rx_bufsize,
348 GFP_KERNEL);
349 if (skb == NULL) {
350 error = -ENOMEM;
351 goto err;
352 }
353
354 bf->bf_mpdu = skb;
355 bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
356 common->rx_bufsize,
357 DMA_FROM_DEVICE);
358 if (unlikely(dma_mapping_error(sc->dev,
359 bf->bf_buf_addr))) {
360 dev_kfree_skb_any(skb);
361 bf->bf_mpdu = NULL;
362 bf->bf_buf_addr = 0;
363 ath_err(common,
364 "dma_mapping_error() on RX init\n");
365 error = -ENOMEM;
366 goto err;
367 }
368 }
369 sc->rx.rxlink = NULL;
370 }
371
372 err:
373 if (error)
374 ath_rx_cleanup(sc);
375
376 return error;
377 }
378
379 void ath_rx_cleanup(struct ath_softc *sc)
380 {
381 struct ath_hw *ah = sc->sc_ah;
382 struct ath_common *common = ath9k_hw_common(ah);
383 struct sk_buff *skb;
384 struct ath_buf *bf;
385
386 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
387 ath_rx_edma_cleanup(sc);
388 return;
389 } else {
390 list_for_each_entry(bf, &sc->rx.rxbuf, list) {
391 skb = bf->bf_mpdu;
392 if (skb) {
393 dma_unmap_single(sc->dev, bf->bf_buf_addr,
394 common->rx_bufsize,
395 DMA_FROM_DEVICE);
396 dev_kfree_skb(skb);
397 bf->bf_buf_addr = 0;
398 bf->bf_mpdu = NULL;
399 }
400 }
401
402 if (sc->rx.rxdma.dd_desc_len != 0)
403 ath_descdma_cleanup(sc, &sc->rx.rxdma, &sc->rx.rxbuf);
404 }
405 }
406
407 /*
408 * Calculate the receive filter according to the
409 * operating mode and state:
410 *
411 * o always accept unicast, broadcast, and multicast traffic
412 * o maintain current state of phy error reception (the hal
413 * may enable phy error frames for noise immunity work)
414 * o probe request frames are accepted only when operating in
415 * hostap, adhoc, or monitor modes
416 * o enable promiscuous mode according to the interface state
417 * o accept beacons:
418 * - when operating in adhoc mode so the 802.11 layer creates
419 * node table entries for peers,
420 * - when operating in station mode for collecting rssi data when
421 * the station is otherwise quiet, or
422 * - when operating as a repeater so we see repeater-sta beacons
423 * - when scanning
424 */
425
426 u32 ath_calcrxfilter(struct ath_softc *sc)
427 {
428 #define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)
429
430 u32 rfilt;
431
432 rfilt = (ath9k_hw_getrxfilter(sc->sc_ah) & RX_FILTER_PRESERVE)
433 | ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
434 | ATH9K_RX_FILTER_MCAST;
435
436 if (sc->rx.rxfilter & FIF_PROBE_REQ)
437 rfilt |= ATH9K_RX_FILTER_PROBEREQ;
438
439 /*
440 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
441 * mode interface or when in monitor mode. AP mode does not need this
442 * since it receives all in-BSS frames anyway.
443 */
444 if (sc->sc_ah->is_monitoring)
445 rfilt |= ATH9K_RX_FILTER_PROM;
446
447 if (sc->rx.rxfilter & FIF_CONTROL)
448 rfilt |= ATH9K_RX_FILTER_CONTROL;
449
450 if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) &&
451 (sc->nvifs <= 1) &&
452 !(sc->rx.rxfilter & FIF_BCN_PRBRESP_PROMISC))
453 rfilt |= ATH9K_RX_FILTER_MYBEACON;
454 else
455 rfilt |= ATH9K_RX_FILTER_BEACON;
456
457 if ((sc->sc_ah->opmode == NL80211_IFTYPE_AP) ||
458 (sc->rx.rxfilter & FIF_PSPOLL))
459 rfilt |= ATH9K_RX_FILTER_PSPOLL;
460
461 if (conf_is_ht(&sc->hw->conf))
462 rfilt |= ATH9K_RX_FILTER_COMP_BAR;
463
464 if (sc->nvifs > 1 || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
465 /* The following may also be needed for other older chips */
466 if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160)
467 rfilt |= ATH9K_RX_FILTER_PROM;
468 rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
469 }
470
471 return rfilt;
472
473 #undef RX_FILTER_PRESERVE
474 }
475
476 int ath_startrecv(struct ath_softc *sc)
477 {
478 struct ath_hw *ah = sc->sc_ah;
479 struct ath_buf *bf, *tbf;
480
481 if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) {
482 ath_edma_start_recv(sc);
483 return 0;
484 }
485
486 spin_lock_bh(&sc->rx.rxbuflock);
487 if (list_empty(&sc->rx.rxbuf))
488 goto start_recv;
489
490 sc->rx.rxlink = NULL;
491 list_for_each_entry_safe(bf, tbf, &sc->rx.rxbuf, list) {
492 ath_rx_buf_link(sc, bf);
493 }
494
495 /* We could have deleted elements so the list may be empty now */
496 if (list_empty(&sc->rx.rxbuf))
497 goto start_recv;
498
499 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
500 ath9k_hw_putrxbuf(ah, bf->bf_daddr);
501 ath9k_hw_rxena(ah);
502
503 start_recv:
504 ath_opmode_init(sc);
505 ath9k_hw_startpcureceive(ah, (sc->sc_flags & SC_OP_OFFCHANNEL));
506
507 spin_unlock_bh(&sc->rx.rxbuflock);
508
509 return 0;
510 }
511
512 bool ath_stoprecv(struct ath_softc *sc)
513 {
514 struct ath_hw *ah = sc->sc_ah;
515 bool stopped, reset = false;
516
517 spin_lock_bh(&sc->rx.rxbuflock);
518 ath9k_hw_abortpcurecv(ah);
519 ath9k_hw_setrxfilter(ah, 0);
520 stopped = ath9k_hw_stopdmarecv(ah, &reset);
521
522 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
523 ath_edma_stop_recv(sc);
524 else
525 sc->rx.rxlink = NULL;
526 spin_unlock_bh(&sc->rx.rxbuflock);
527
528 if (!(ah->ah_flags & AH_UNPLUGGED) &&
529 unlikely(!stopped)) {
530 ath_err(ath9k_hw_common(sc->sc_ah),
531 "Could not stop RX, we could be "
532 "confusing the DMA engine when we start RX up\n");
533 ATH_DBG_WARN_ON_ONCE(!stopped);
534 }
535 return stopped && !reset;
536 }
537
538 void ath_flushrecv(struct ath_softc *sc)
539 {
540 sc->sc_flags |= SC_OP_RXFLUSH;
541 if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA)
542 ath_rx_tasklet(sc, 1, true);
543 ath_rx_tasklet(sc, 1, false);
544 sc->sc_flags &= ~SC_OP_RXFLUSH;
545 }
546
547 static bool ath_beacon_dtim_pending_cab(struct sk_buff *skb)
548 {
549 /* Check whether the Beacon frame has DTIM indicating buffered bc/mc */
550 struct ieee80211_mgmt *mgmt;
551 u8 *pos, *end, id, elen;
552 struct ieee80211_tim_ie *tim;
553
554 mgmt = (struct ieee80211_mgmt *)skb->data;
555 pos = mgmt->u.beacon.variable;
556 end = skb->data + skb->len;
557
558 while (pos + 2 < end) {
559 id = *pos++;
560 elen = *pos++;
561 if (pos + elen > end)
562 break;
563
564 if (id == WLAN_EID_TIM) {
565 if (elen < sizeof(*tim))
566 break;
567 tim = (struct ieee80211_tim_ie *) pos;
568 if (tim->dtim_count != 0)
569 break;
570 return tim->bitmap_ctrl & 0x01;
571 }
572
573 pos += elen;
574 }
575
576 return false;
577 }
578
579 static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
580 {
581 struct ieee80211_mgmt *mgmt;
582 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
583
584 if (skb->len < 24 + 8 + 2 + 2)
585 return;
586
587 mgmt = (struct ieee80211_mgmt *)skb->data;
588 if (memcmp(common->curbssid, mgmt->bssid, ETH_ALEN) != 0) {
589 /* TODO: This doesn't work well if you have stations
590 * associated to two different APs because curbssid
591 * is just the last AP that any of the stations associated
592 * with.
593 */
594 return; /* not from our current AP */
595 }
596
597 sc->ps_flags &= ~PS_WAIT_FOR_BEACON;
598
599 if (sc->ps_flags & PS_BEACON_SYNC) {
600 sc->ps_flags &= ~PS_BEACON_SYNC;
601 ath_dbg(common, ATH_DBG_PS,
602 "Reconfigure Beacon timers based on timestamp from the AP\n");
603 ath_set_beacon(sc);
604 sc->ps_flags &= ~PS_TSFOOR_SYNC;
605 }
606
607 if (ath_beacon_dtim_pending_cab(skb)) {
608 /*
609 * Remain awake waiting for buffered broadcast/multicast
610 * frames. If the last broadcast/multicast frame is not
611 * received properly, the next beacon frame will work as
612 * a backup trigger for returning into NETWORK SLEEP state,
613 * so we are waiting for it as well.
614 */
615 ath_dbg(common, ATH_DBG_PS,
616 "Received DTIM beacon indicating buffered broadcast/multicast frame(s)\n");
617 sc->ps_flags |= PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON;
618 return;
619 }
620
621 if (sc->ps_flags & PS_WAIT_FOR_CAB) {
622 /*
623 * This can happen if a broadcast frame is dropped or the AP
624 * fails to send a frame indicating that all CAB frames have
625 * been delivered.
626 */
627 sc->ps_flags &= ~PS_WAIT_FOR_CAB;
628 ath_dbg(common, ATH_DBG_PS,
629 "PS wait for CAB frames timed out\n");
630 }
631 }
632
633 static void ath_rx_ps(struct ath_softc *sc, struct sk_buff *skb)
634 {
635 struct ieee80211_hdr *hdr;
636 struct ath_common *common = ath9k_hw_common(sc->sc_ah);
637
638 hdr = (struct ieee80211_hdr *)skb->data;
639
640 /* Process Beacon and CAB receive in PS state */
641 if (((sc->ps_flags & PS_WAIT_FOR_BEACON) || ath9k_check_auto_sleep(sc))
642 && ieee80211_is_beacon(hdr->frame_control))
643 ath_rx_ps_beacon(sc, skb);
644 else if ((sc->ps_flags & PS_WAIT_FOR_CAB) &&
645 (ieee80211_is_data(hdr->frame_control) ||
646 ieee80211_is_action(hdr->frame_control)) &&
647 is_multicast_ether_addr(hdr->addr1) &&
648 !ieee80211_has_moredata(hdr->frame_control)) {
649 /*
650 * No more broadcast/multicast frames to be received at this
651 * point.
652 */
653 sc->ps_flags &= ~(PS_WAIT_FOR_CAB | PS_WAIT_FOR_BEACON);
654 ath_dbg(common, ATH_DBG_PS,
655 "All PS CAB frames received, back to sleep\n");
656 } else if ((sc->ps_flags & PS_WAIT_FOR_PSPOLL_DATA) &&
657 !is_multicast_ether_addr(hdr->addr1) &&
658 !ieee80211_has_morefrags(hdr->frame_control)) {
659 sc->ps_flags &= ~PS_WAIT_FOR_PSPOLL_DATA;
660 ath_dbg(common, ATH_DBG_PS,
661 "Going back to sleep after having received PS-Poll data (0x%lx)\n",
662 sc->ps_flags & (PS_WAIT_FOR_BEACON |
663 PS_WAIT_FOR_CAB |
664 PS_WAIT_FOR_PSPOLL_DATA |
665 PS_WAIT_FOR_TX_ACK));
666 }
667 }
668
669 static bool ath_edma_get_buffers(struct ath_softc *sc,
670 enum ath9k_rx_qtype qtype)
671 {
672 struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
673 struct ath_hw *ah = sc->sc_ah;
674 struct ath_common *common = ath9k_hw_common(ah);
675 struct sk_buff *skb;
676 struct ath_buf *bf;
677 int ret;
678
679 skb = skb_peek(&rx_edma->rx_fifo);
680 if (!skb)
681 return false;
682
683 bf = SKB_CB_ATHBUF(skb);
684 BUG_ON(!bf);
685
686 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
687 common->rx_bufsize, DMA_FROM_DEVICE);
688
689 ret = ath9k_hw_process_rxdesc_edma(ah, NULL, skb->data);
690 if (ret == -EINPROGRESS) {
691 /*let device gain the buffer again*/
692 dma_sync_single_for_device(sc->dev, bf->bf_buf_addr,
693 common->rx_bufsize, DMA_FROM_DEVICE);
694 return false;
695 }
696
697 __skb_unlink(skb, &rx_edma->rx_fifo);
698 if (ret == -EINVAL) {
699 /* corrupt descriptor, skip this one and the following one */
700 list_add_tail(&bf->list, &sc->rx.rxbuf);
701 ath_rx_edma_buf_link(sc, qtype);
702 skb = skb_peek(&rx_edma->rx_fifo);
703 if (!skb)
704 return true;
705
706 bf = SKB_CB_ATHBUF(skb);
707 BUG_ON(!bf);
708
709 __skb_unlink(skb, &rx_edma->rx_fifo);
710 list_add_tail(&bf->list, &sc->rx.rxbuf);
711 ath_rx_edma_buf_link(sc, qtype);
712 return true;
713 }
714 skb_queue_tail(&rx_edma->rx_buffers, skb);
715
716 return true;
717 }
718
719 static struct ath_buf *ath_edma_get_next_rx_buf(struct ath_softc *sc,
720 struct ath_rx_status *rs,
721 enum ath9k_rx_qtype qtype)
722 {
723 struct ath_rx_edma *rx_edma = &sc->rx.rx_edma[qtype];
724 struct sk_buff *skb;
725 struct ath_buf *bf;
726
727 while (ath_edma_get_buffers(sc, qtype));
728 skb = __skb_dequeue(&rx_edma->rx_buffers);
729 if (!skb)
730 return NULL;
731
732 bf = SKB_CB_ATHBUF(skb);
733 ath9k_hw_process_rxdesc_edma(sc->sc_ah, rs, skb->data);
734 return bf;
735 }
736
737 static struct ath_buf *ath_get_next_rx_buf(struct ath_softc *sc,
738 struct ath_rx_status *rs)
739 {
740 struct ath_hw *ah = sc->sc_ah;
741 struct ath_common *common = ath9k_hw_common(ah);
742 struct ath_desc *ds;
743 struct ath_buf *bf;
744 int ret;
745
746 if (list_empty(&sc->rx.rxbuf)) {
747 sc->rx.rxlink = NULL;
748 return NULL;
749 }
750
751 bf = list_first_entry(&sc->rx.rxbuf, struct ath_buf, list);
752 ds = bf->bf_desc;
753
754 /*
755 * Must provide the virtual address of the current
756 * descriptor, the physical address, and the virtual
757 * address of the next descriptor in the h/w chain.
758 * This allows the HAL to look ahead to see if the
759 * hardware is done with a descriptor by checking the
760 * done bit in the following descriptor and the address
761 * of the current descriptor the DMA engine is working
762 * on. All this is necessary because of our use of
763 * a self-linked list to avoid rx overruns.
764 */
765 ret = ath9k_hw_rxprocdesc(ah, ds, rs, 0);
766 if (ret == -EINPROGRESS) {
767 struct ath_rx_status trs;
768 struct ath_buf *tbf;
769 struct ath_desc *tds;
770
771 memset(&trs, 0, sizeof(trs));
772 if (list_is_last(&bf->list, &sc->rx.rxbuf)) {
773 sc->rx.rxlink = NULL;
774 return NULL;
775 }
776
777 tbf = list_entry(bf->list.next, struct ath_buf, list);
778
779 /*
780 * On some hardware the descriptor status words could
781 * get corrupted, including the done bit. Because of
782 * this, check if the next descriptor's done bit is
783 * set or not.
784 *
785 * If the next descriptor's done bit is set, the current
786 * descriptor has been corrupted. Force s/w to discard
787 * this descriptor and continue...
788 */
789
790 tds = tbf->bf_desc;
791 ret = ath9k_hw_rxprocdesc(ah, tds, &trs, 0);
792 if (ret == -EINPROGRESS)
793 return NULL;
794 }
795
796 if (!bf->bf_mpdu)
797 return bf;
798
799 /*
800 * Synchronize the DMA transfer with CPU before
801 * 1. accessing the frame
802 * 2. requeueing the same buffer to h/w
803 */
804 dma_sync_single_for_cpu(sc->dev, bf->bf_buf_addr,
805 common->rx_bufsize,
806 DMA_FROM_DEVICE);
807
808 return bf;
809 }
810
811 /* Assumes you've already done the endian to CPU conversion */
812 static bool ath9k_rx_accept(struct ath_common *common,
813 struct ieee80211_hdr *hdr,
814 struct ieee80211_rx_status *rxs,
815 struct ath_rx_status *rx_stats,
816 bool *decrypt_error)
817 {
818 bool is_mc, is_valid_tkip, strip_mic, mic_error;
819 struct ath_hw *ah = common->ah;
820 __le16 fc;
821 u8 rx_status_len = ah->caps.rx_status_len;
822
823 fc = hdr->frame_control;
824
825 is_mc = !!is_multicast_ether_addr(hdr->addr1);
826 is_valid_tkip = rx_stats->rs_keyix != ATH9K_RXKEYIX_INVALID &&
827 test_bit(rx_stats->rs_keyix, common->tkip_keymap);
828 strip_mic = is_valid_tkip && !(rx_stats->rs_status &
829 (ATH9K_RXERR_DECRYPT | ATH9K_RXERR_CRC | ATH9K_RXERR_MIC));
830
831 if (!rx_stats->rs_datalen)
832 return false;
833 /*
834 * rs_status follows rs_datalen so if rs_datalen is too large
835 * we can take a hint that hardware corrupted it, so ignore
836 * those frames.
837 */
838 if (rx_stats->rs_datalen > (common->rx_bufsize - rx_status_len))
839 return false;
840
841 /* Only use error bits from the last fragment */
842 if (rx_stats->rs_more)
843 return true;
844
845 mic_error = is_valid_tkip && !ieee80211_is_ctl(fc) &&
846 !ieee80211_has_morefrags(fc) &&
847 !(le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG) &&
848 (rx_stats->rs_status & ATH9K_RXERR_MIC);
849
850 /*
851 * The rx_stats->rs_status will not be set until the end of the
852 * chained descriptors so it can be ignored if rs_more is set. The
853 * rs_more will be false at the last element of the chained
854 * descriptors.
855 */
856 if (rx_stats->rs_status != 0) {
857 if (rx_stats->rs_status & ATH9K_RXERR_CRC) {
858 rxs->flag |= RX_FLAG_FAILED_FCS_CRC;
859 mic_error = false;
860 }
861 if (rx_stats->rs_status & ATH9K_RXERR_PHY)
862 return false;
863
864 if (rx_stats->rs_status & ATH9K_RXERR_DECRYPT) {
865 *decrypt_error = true;
866 mic_error = false;
867 }
868
869 /*
870 * Reject error frames with the exception of
871 * decryption and MIC failures. For monitor mode,
872 * we also ignore the CRC error.
873 */
874 if (ah->is_monitoring) {
875 if (rx_stats->rs_status &
876 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
877 ATH9K_RXERR_CRC))
878 return false;
879 } else {
880 if (rx_stats->rs_status &
881 ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
882 return false;
883 }
884 }
885 }
886
887 /*
888 * For unicast frames the MIC error bit can have false positives,
889 * so all MIC error reports need to be validated in software.
890 * False negatives are not common, so skip software verification
891 * if the hardware considers the MIC valid.
892 */
893 if (strip_mic)
894 rxs->flag |= RX_FLAG_MMIC_STRIPPED;
895 else if (is_mc && mic_error)
896 rxs->flag |= RX_FLAG_MMIC_ERROR;
897
898 return true;
899 }
900
901 static int ath9k_process_rate(struct ath_common *common,
902 struct ieee80211_hw *hw,
903 struct ath_rx_status *rx_stats,
904 struct ieee80211_rx_status *rxs)
905 {
906 struct ieee80211_supported_band *sband;
907 enum ieee80211_band band;
908 unsigned int i = 0;
909
910 band = hw->conf.channel->band;
911 sband = hw->wiphy->bands[band];
912
913 if (rx_stats->rs_rate & 0x80) {
914 /* HT rate */
915 rxs->flag |= RX_FLAG_HT;
916 if (rx_stats->rs_flags & ATH9K_RX_2040)
917 rxs->flag |= RX_FLAG_40MHZ;
918 if (rx_stats->rs_flags & ATH9K_RX_GI)
919 rxs->flag |= RX_FLAG_SHORT_GI;
920 rxs->rate_idx = rx_stats->rs_rate & 0x7f;
921 return 0;
922 }
923
924 for (i = 0; i < sband->n_bitrates; i++) {
925 if (sband->bitrates[i].hw_value == rx_stats->rs_rate) {
926 rxs->rate_idx = i;
927 return 0;
928 }
929 if (sband->bitrates[i].hw_value_short == rx_stats->rs_rate) {
930 rxs->flag |= RX_FLAG_SHORTPRE;
931 rxs->rate_idx = i;
932 return 0;
933 }
934 }
935
936 /*
937 * No valid hardware bitrate found -- we should not get here
938 * because hardware has already validated this frame as OK.
939 */
940 ath_dbg(common, ATH_DBG_XMIT,
941 "unsupported hw bitrate detected 0x%02x using 1 Mbit\n",
942 rx_stats->rs_rate);
943
944 return -EINVAL;
945 }
946
947 static void ath9k_process_rssi(struct ath_common *common,
948 struct ieee80211_hw *hw,
949 struct ieee80211_hdr *hdr,
950 struct ath_rx_status *rx_stats)
951 {
952 struct ath_softc *sc = hw->priv;
953 struct ath_hw *ah = common->ah;
954 int last_rssi;
955 __le16 fc;
956
957 if ((ah->opmode != NL80211_IFTYPE_STATION) &&
958 (ah->opmode != NL80211_IFTYPE_ADHOC))
959 return;
960
961 fc = hdr->frame_control;
962 if (!ieee80211_is_beacon(fc) ||
963 compare_ether_addr(hdr->addr3, common->curbssid)) {
964 /* TODO: This doesn't work well if you have stations
965 * associated to two different APs because curbssid
966 * is just the last AP that any of the stations associated
967 * with.
968 */
969 return;
970 }
971
972 if (rx_stats->rs_rssi != ATH9K_RSSI_BAD && !rx_stats->rs_moreaggr)
973 ATH_RSSI_LPF(sc->last_rssi, rx_stats->rs_rssi);
974
975 last_rssi = sc->last_rssi;
976 if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
977 rx_stats->rs_rssi = ATH_EP_RND(last_rssi,
978 ATH_RSSI_EP_MULTIPLIER);
979 if (rx_stats->rs_rssi < 0)
980 rx_stats->rs_rssi = 0;
981
982 /* Update Beacon RSSI, this is used by ANI. */
983 ah->stats.avgbrssi = rx_stats->rs_rssi;
984 }
985
986 /*
987 * For Decrypt or Demic errors, we only mark packet status here and always push
988 * up the frame up to let mac80211 handle the actual error case, be it no
989 * decryption key or real decryption error. This let us keep statistics there.
990 */
991 static int ath9k_rx_skb_preprocess(struct ath_common *common,
992 struct ieee80211_hw *hw,
993 struct ieee80211_hdr *hdr,
994 struct ath_rx_status *rx_stats,
995 struct ieee80211_rx_status *rx_status,
996 bool *decrypt_error)
997 {
998 memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
999
1000 /*
1001 * everything but the rate is checked here, the rate check is done
1002 * separately to avoid doing two lookups for a rate for each frame.
1003 */
1004 if (!ath9k_rx_accept(common, hdr, rx_status, rx_stats, decrypt_error))
1005 return -EINVAL;
1006
1007 /* Only use status info from the last fragment */
1008 if (rx_stats->rs_more)
1009 return 0;
1010
1011 ath9k_process_rssi(common, hw, hdr, rx_stats);
1012
1013 if (ath9k_process_rate(common, hw, rx_stats, rx_status))
1014 return -EINVAL;
1015
1016 rx_status->band = hw->conf.channel->band;
1017 rx_status->freq = hw->conf.channel->center_freq;
1018 rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi;
1019 rx_status->antenna = rx_stats->rs_antenna;
1020 rx_status->flag |= RX_FLAG_MACTIME_MPDU;
1021
1022 return 0;
1023 }
1024
1025 static void ath9k_rx_skb_postprocess(struct ath_common *common,
1026 struct sk_buff *skb,
1027 struct ath_rx_status *rx_stats,
1028 struct ieee80211_rx_status *rxs,
1029 bool decrypt_error)
1030 {
1031 struct ath_hw *ah = common->ah;
1032 struct ieee80211_hdr *hdr;
1033 int hdrlen, padpos, padsize;
1034 u8 keyix;
1035 __le16 fc;
1036
1037 /* see if any padding is done by the hw and remove it */
1038 hdr = (struct ieee80211_hdr *) skb->data;
1039 hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1040 fc = hdr->frame_control;
1041 padpos = ath9k_cmn_padpos(hdr->frame_control);
1042
1043 /* The MAC header is padded to have 32-bit boundary if the
1044 * packet payload is non-zero. The general calculation for
1045 * padsize would take into account odd header lengths:
1046 * padsize = (4 - padpos % 4) % 4; However, since only
1047 * even-length headers are used, padding can only be 0 or 2
1048 * bytes and we can optimize this a bit. In addition, we must
1049 * not try to remove padding from short control frames that do
1050 * not have payload. */
1051 padsize = padpos & 3;
1052 if (padsize && skb->len>=padpos+padsize+FCS_LEN) {
1053 memmove(skb->data + padsize, skb->data, padpos);
1054 skb_pull(skb, padsize);
1055 }
1056
1057 keyix = rx_stats->rs_keyix;
1058
1059 if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error &&
1060 ieee80211_has_protected(fc)) {
1061 rxs->flag |= RX_FLAG_DECRYPTED;
1062 } else if (ieee80211_has_protected(fc)
1063 && !decrypt_error && skb->len >= hdrlen + 4) {
1064 keyix = skb->data[hdrlen + 3] >> 6;
1065
1066 if (test_bit(keyix, common->keymap))
1067 rxs->flag |= RX_FLAG_DECRYPTED;
1068 }
1069 if (ah->sw_mgmt_crypto &&
1070 (rxs->flag & RX_FLAG_DECRYPTED) &&
1071 ieee80211_is_mgmt(fc))
1072 /* Use software decrypt for management frames. */
1073 rxs->flag &= ~RX_FLAG_DECRYPTED;
1074 }
1075
1076 static void ath_lnaconf_alt_good_scan(struct ath_ant_comb *antcomb,
1077 struct ath_hw_antcomb_conf ant_conf,
1078 int main_rssi_avg)
1079 {
1080 antcomb->quick_scan_cnt = 0;
1081
1082 if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA2)
1083 antcomb->rssi_lna2 = main_rssi_avg;
1084 else if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA1)
1085 antcomb->rssi_lna1 = main_rssi_avg;
1086
1087 switch ((ant_conf.main_lna_conf << 4) | ant_conf.alt_lna_conf) {
1088 case 0x10: /* LNA2 A-B */
1089 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1090 antcomb->first_quick_scan_conf =
1091 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1092 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
1093 break;
1094 case 0x20: /* LNA1 A-B */
1095 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1096 antcomb->first_quick_scan_conf =
1097 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1098 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
1099 break;
1100 case 0x21: /* LNA1 LNA2 */
1101 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA2;
1102 antcomb->first_quick_scan_conf =
1103 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1104 antcomb->second_quick_scan_conf =
1105 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1106 break;
1107 case 0x12: /* LNA2 LNA1 */
1108 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1;
1109 antcomb->first_quick_scan_conf =
1110 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1111 antcomb->second_quick_scan_conf =
1112 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1113 break;
1114 case 0x13: /* LNA2 A+B */
1115 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1116 antcomb->first_quick_scan_conf =
1117 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1118 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1;
1119 break;
1120 case 0x23: /* LNA1 A+B */
1121 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1122 antcomb->first_quick_scan_conf =
1123 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1124 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2;
1125 break;
1126 default:
1127 break;
1128 }
1129 }
1130
1131 static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb,
1132 struct ath_hw_antcomb_conf *div_ant_conf,
1133 int main_rssi_avg, int alt_rssi_avg,
1134 int alt_ratio)
1135 {
1136 /* alt_good */
1137 switch (antcomb->quick_scan_cnt) {
1138 case 0:
1139 /* set alt to main, and alt to first conf */
1140 div_ant_conf->main_lna_conf = antcomb->main_conf;
1141 div_ant_conf->alt_lna_conf = antcomb->first_quick_scan_conf;
1142 break;
1143 case 1:
1144 /* set alt to main, and alt to first conf */
1145 div_ant_conf->main_lna_conf = antcomb->main_conf;
1146 div_ant_conf->alt_lna_conf = antcomb->second_quick_scan_conf;
1147 antcomb->rssi_first = main_rssi_avg;
1148 antcomb->rssi_second = alt_rssi_avg;
1149
1150 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
1151 /* main is LNA1 */
1152 if (ath_is_alt_ant_ratio_better(alt_ratio,
1153 ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
1154 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1155 main_rssi_avg, alt_rssi_avg,
1156 antcomb->total_pkt_count))
1157 antcomb->first_ratio = true;
1158 else
1159 antcomb->first_ratio = false;
1160 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
1161 if (ath_is_alt_ant_ratio_better(alt_ratio,
1162 ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
1163 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1164 main_rssi_avg, alt_rssi_avg,
1165 antcomb->total_pkt_count))
1166 antcomb->first_ratio = true;
1167 else
1168 antcomb->first_ratio = false;
1169 } else {
1170 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
1171 (alt_rssi_avg > main_rssi_avg +
1172 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
1173 (alt_rssi_avg > main_rssi_avg)) &&
1174 (antcomb->total_pkt_count > 50))
1175 antcomb->first_ratio = true;
1176 else
1177 antcomb->first_ratio = false;
1178 }
1179 break;
1180 case 2:
1181 antcomb->alt_good = false;
1182 antcomb->scan_not_start = false;
1183 antcomb->scan = false;
1184 antcomb->rssi_first = main_rssi_avg;
1185 antcomb->rssi_third = alt_rssi_avg;
1186
1187 if (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1)
1188 antcomb->rssi_lna1 = alt_rssi_avg;
1189 else if (antcomb->second_quick_scan_conf ==
1190 ATH_ANT_DIV_COMB_LNA2)
1191 antcomb->rssi_lna2 = alt_rssi_avg;
1192 else if (antcomb->second_quick_scan_conf ==
1193 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2) {
1194 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2)
1195 antcomb->rssi_lna2 = main_rssi_avg;
1196 else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1)
1197 antcomb->rssi_lna1 = main_rssi_avg;
1198 }
1199
1200 if (antcomb->rssi_lna2 > antcomb->rssi_lna1 +
1201 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)
1202 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
1203 else
1204 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1;
1205
1206 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) {
1207 if (ath_is_alt_ant_ratio_better(alt_ratio,
1208 ATH_ANT_DIV_COMB_LNA1_DELTA_HI,
1209 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1210 main_rssi_avg, alt_rssi_avg,
1211 antcomb->total_pkt_count))
1212 antcomb->second_ratio = true;
1213 else
1214 antcomb->second_ratio = false;
1215 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) {
1216 if (ath_is_alt_ant_ratio_better(alt_ratio,
1217 ATH_ANT_DIV_COMB_LNA1_DELTA_MID,
1218 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW,
1219 main_rssi_avg, alt_rssi_avg,
1220 antcomb->total_pkt_count))
1221 antcomb->second_ratio = true;
1222 else
1223 antcomb->second_ratio = false;
1224 } else {
1225 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
1226 (alt_rssi_avg > main_rssi_avg +
1227 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
1228 (alt_rssi_avg > main_rssi_avg)) &&
1229 (antcomb->total_pkt_count > 50))
1230 antcomb->second_ratio = true;
1231 else
1232 antcomb->second_ratio = false;
1233 }
1234
1235 /* set alt to the conf with maximun ratio */
1236 if (antcomb->first_ratio && antcomb->second_ratio) {
1237 if (antcomb->rssi_second > antcomb->rssi_third) {
1238 /* first alt*/
1239 if ((antcomb->first_quick_scan_conf ==
1240 ATH_ANT_DIV_COMB_LNA1) ||
1241 (antcomb->first_quick_scan_conf ==
1242 ATH_ANT_DIV_COMB_LNA2))
1243 /* Set alt LNA1 or LNA2*/
1244 if (div_ant_conf->main_lna_conf ==
1245 ATH_ANT_DIV_COMB_LNA2)
1246 div_ant_conf->alt_lna_conf =
1247 ATH_ANT_DIV_COMB_LNA1;
1248 else
1249 div_ant_conf->alt_lna_conf =
1250 ATH_ANT_DIV_COMB_LNA2;
1251 else
1252 /* Set alt to A+B or A-B */
1253 div_ant_conf->alt_lna_conf =
1254 antcomb->first_quick_scan_conf;
1255 } else if ((antcomb->second_quick_scan_conf ==
1256 ATH_ANT_DIV_COMB_LNA1) ||
1257 (antcomb->second_quick_scan_conf ==
1258 ATH_ANT_DIV_COMB_LNA2)) {
1259 /* Set alt LNA1 or LNA2 */
1260 if (div_ant_conf->main_lna_conf ==
1261 ATH_ANT_DIV_COMB_LNA2)
1262 div_ant_conf->alt_lna_conf =
1263 ATH_ANT_DIV_COMB_LNA1;
1264 else
1265 div_ant_conf->alt_lna_conf =
1266 ATH_ANT_DIV_COMB_LNA2;
1267 } else {
1268 /* Set alt to A+B or A-B */
1269 div_ant_conf->alt_lna_conf =
1270 antcomb->second_quick_scan_conf;
1271 }
1272 } else if (antcomb->first_ratio) {
1273 /* first alt */
1274 if ((antcomb->first_quick_scan_conf ==
1275 ATH_ANT_DIV_COMB_LNA1) ||
1276 (antcomb->first_quick_scan_conf ==
1277 ATH_ANT_DIV_COMB_LNA2))
1278 /* Set alt LNA1 or LNA2 */
1279 if (div_ant_conf->main_lna_conf ==
1280 ATH_ANT_DIV_COMB_LNA2)
1281 div_ant_conf->alt_lna_conf =
1282 ATH_ANT_DIV_COMB_LNA1;
1283 else
1284 div_ant_conf->alt_lna_conf =
1285 ATH_ANT_DIV_COMB_LNA2;
1286 else
1287 /* Set alt to A+B or A-B */
1288 div_ant_conf->alt_lna_conf =
1289 antcomb->first_quick_scan_conf;
1290 } else if (antcomb->second_ratio) {
1291 /* second alt */
1292 if ((antcomb->second_quick_scan_conf ==
1293 ATH_ANT_DIV_COMB_LNA1) ||
1294 (antcomb->second_quick_scan_conf ==
1295 ATH_ANT_DIV_COMB_LNA2))
1296 /* Set alt LNA1 or LNA2 */
1297 if (div_ant_conf->main_lna_conf ==
1298 ATH_ANT_DIV_COMB_LNA2)
1299 div_ant_conf->alt_lna_conf =
1300 ATH_ANT_DIV_COMB_LNA1;
1301 else
1302 div_ant_conf->alt_lna_conf =
1303 ATH_ANT_DIV_COMB_LNA2;
1304 else
1305 /* Set alt to A+B or A-B */
1306 div_ant_conf->alt_lna_conf =
1307 antcomb->second_quick_scan_conf;
1308 } else {
1309 /* main is largest */
1310 if ((antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) ||
1311 (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2))
1312 /* Set alt LNA1 or LNA2 */
1313 if (div_ant_conf->main_lna_conf ==
1314 ATH_ANT_DIV_COMB_LNA2)
1315 div_ant_conf->alt_lna_conf =
1316 ATH_ANT_DIV_COMB_LNA1;
1317 else
1318 div_ant_conf->alt_lna_conf =
1319 ATH_ANT_DIV_COMB_LNA2;
1320 else
1321 /* Set alt to A+B or A-B */
1322 div_ant_conf->alt_lna_conf = antcomb->main_conf;
1323 }
1324 break;
1325 default:
1326 break;
1327 }
1328 }
1329
1330 static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf,
1331 struct ath_ant_comb *antcomb, int alt_ratio)
1332 {
1333 if (ant_conf->div_group == 0) {
1334 /* Adjust the fast_div_bias based on main and alt lna conf */
1335 switch ((ant_conf->main_lna_conf << 4) |
1336 ant_conf->alt_lna_conf) {
1337 case 0x01: /* A-B LNA2 */
1338 ant_conf->fast_div_bias = 0x3b;
1339 break;
1340 case 0x02: /* A-B LNA1 */
1341 ant_conf->fast_div_bias = 0x3d;
1342 break;
1343 case 0x03: /* A-B A+B */
1344 ant_conf->fast_div_bias = 0x1;
1345 break;
1346 case 0x10: /* LNA2 A-B */
1347 ant_conf->fast_div_bias = 0x7;
1348 break;
1349 case 0x12: /* LNA2 LNA1 */
1350 ant_conf->fast_div_bias = 0x2;
1351 break;
1352 case 0x13: /* LNA2 A+B */
1353 ant_conf->fast_div_bias = 0x7;
1354 break;
1355 case 0x20: /* LNA1 A-B */
1356 ant_conf->fast_div_bias = 0x6;
1357 break;
1358 case 0x21: /* LNA1 LNA2 */
1359 ant_conf->fast_div_bias = 0x0;
1360 break;
1361 case 0x23: /* LNA1 A+B */
1362 ant_conf->fast_div_bias = 0x6;
1363 break;
1364 case 0x30: /* A+B A-B */
1365 ant_conf->fast_div_bias = 0x1;
1366 break;
1367 case 0x31: /* A+B LNA2 */
1368 ant_conf->fast_div_bias = 0x3b;
1369 break;
1370 case 0x32: /* A+B LNA1 */
1371 ant_conf->fast_div_bias = 0x3d;
1372 break;
1373 default:
1374 break;
1375 }
1376 } else if (ant_conf->div_group == 1) {
1377 /* Adjust the fast_div_bias based on main and alt_lna_conf */
1378 switch ((ant_conf->main_lna_conf << 4) |
1379 ant_conf->alt_lna_conf) {
1380 case 0x01: /* A-B LNA2 */
1381 ant_conf->fast_div_bias = 0x1;
1382 ant_conf->main_gaintb = 0;
1383 ant_conf->alt_gaintb = 0;
1384 break;
1385 case 0x02: /* A-B LNA1 */
1386 ant_conf->fast_div_bias = 0x1;
1387 ant_conf->main_gaintb = 0;
1388 ant_conf->alt_gaintb = 0;
1389 break;
1390 case 0x03: /* A-B A+B */
1391 ant_conf->fast_div_bias = 0x1;
1392 ant_conf->main_gaintb = 0;
1393 ant_conf->alt_gaintb = 0;
1394 break;
1395 case 0x10: /* LNA2 A-B */
1396 if (!(antcomb->scan) &&
1397 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1398 ant_conf->fast_div_bias = 0x3f;
1399 else
1400 ant_conf->fast_div_bias = 0x1;
1401 ant_conf->main_gaintb = 0;
1402 ant_conf->alt_gaintb = 0;
1403 break;
1404 case 0x12: /* LNA2 LNA1 */
1405 ant_conf->fast_div_bias = 0x1;
1406 ant_conf->main_gaintb = 0;
1407 ant_conf->alt_gaintb = 0;
1408 break;
1409 case 0x13: /* LNA2 A+B */
1410 if (!(antcomb->scan) &&
1411 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1412 ant_conf->fast_div_bias = 0x3f;
1413 else
1414 ant_conf->fast_div_bias = 0x1;
1415 ant_conf->main_gaintb = 0;
1416 ant_conf->alt_gaintb = 0;
1417 break;
1418 case 0x20: /* LNA1 A-B */
1419 if (!(antcomb->scan) &&
1420 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1421 ant_conf->fast_div_bias = 0x3f;
1422 else
1423 ant_conf->fast_div_bias = 0x1;
1424 ant_conf->main_gaintb = 0;
1425 ant_conf->alt_gaintb = 0;
1426 break;
1427 case 0x21: /* LNA1 LNA2 */
1428 ant_conf->fast_div_bias = 0x1;
1429 ant_conf->main_gaintb = 0;
1430 ant_conf->alt_gaintb = 0;
1431 break;
1432 case 0x23: /* LNA1 A+B */
1433 if (!(antcomb->scan) &&
1434 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1435 ant_conf->fast_div_bias = 0x3f;
1436 else
1437 ant_conf->fast_div_bias = 0x1;
1438 ant_conf->main_gaintb = 0;
1439 ant_conf->alt_gaintb = 0;
1440 break;
1441 case 0x30: /* A+B A-B */
1442 ant_conf->fast_div_bias = 0x1;
1443 ant_conf->main_gaintb = 0;
1444 ant_conf->alt_gaintb = 0;
1445 break;
1446 case 0x31: /* A+B LNA2 */
1447 ant_conf->fast_div_bias = 0x1;
1448 ant_conf->main_gaintb = 0;
1449 ant_conf->alt_gaintb = 0;
1450 break;
1451 case 0x32: /* A+B LNA1 */
1452 ant_conf->fast_div_bias = 0x1;
1453 ant_conf->main_gaintb = 0;
1454 ant_conf->alt_gaintb = 0;
1455 break;
1456 default:
1457 break;
1458 }
1459 } else if (ant_conf->div_group == 2) {
1460 /* Adjust the fast_div_bias based on main and alt_lna_conf */
1461 switch ((ant_conf->main_lna_conf << 4) |
1462 ant_conf->alt_lna_conf) {
1463 case 0x01: /* A-B LNA2 */
1464 ant_conf->fast_div_bias = 0x1;
1465 ant_conf->main_gaintb = 0;
1466 ant_conf->alt_gaintb = 0;
1467 break;
1468 case 0x02: /* A-B LNA1 */
1469 ant_conf->fast_div_bias = 0x1;
1470 ant_conf->main_gaintb = 0;
1471 ant_conf->alt_gaintb = 0;
1472 break;
1473 case 0x03: /* A-B A+B */
1474 ant_conf->fast_div_bias = 0x1;
1475 ant_conf->main_gaintb = 0;
1476 ant_conf->alt_gaintb = 0;
1477 break;
1478 case 0x10: /* LNA2 A-B */
1479 if (!(antcomb->scan) &&
1480 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1481 ant_conf->fast_div_bias = 0x1;
1482 else
1483 ant_conf->fast_div_bias = 0x2;
1484 ant_conf->main_gaintb = 0;
1485 ant_conf->alt_gaintb = 0;
1486 break;
1487 case 0x12: /* LNA2 LNA1 */
1488 ant_conf->fast_div_bias = 0x1;
1489 ant_conf->main_gaintb = 0;
1490 ant_conf->alt_gaintb = 0;
1491 break;
1492 case 0x13: /* LNA2 A+B */
1493 if (!(antcomb->scan) &&
1494 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1495 ant_conf->fast_div_bias = 0x1;
1496 else
1497 ant_conf->fast_div_bias = 0x2;
1498 ant_conf->main_gaintb = 0;
1499 ant_conf->alt_gaintb = 0;
1500 break;
1501 case 0x20: /* LNA1 A-B */
1502 if (!(antcomb->scan) &&
1503 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1504 ant_conf->fast_div_bias = 0x1;
1505 else
1506 ant_conf->fast_div_bias = 0x2;
1507 ant_conf->main_gaintb = 0;
1508 ant_conf->alt_gaintb = 0;
1509 break;
1510 case 0x21: /* LNA1 LNA2 */
1511 ant_conf->fast_div_bias = 0x1;
1512 ant_conf->main_gaintb = 0;
1513 ant_conf->alt_gaintb = 0;
1514 break;
1515 case 0x23: /* LNA1 A+B */
1516 if (!(antcomb->scan) &&
1517 (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO))
1518 ant_conf->fast_div_bias = 0x1;
1519 else
1520 ant_conf->fast_div_bias = 0x2;
1521 ant_conf->main_gaintb = 0;
1522 ant_conf->alt_gaintb = 0;
1523 break;
1524 case 0x30: /* A+B A-B */
1525 ant_conf->fast_div_bias = 0x1;
1526 ant_conf->main_gaintb = 0;
1527 ant_conf->alt_gaintb = 0;
1528 break;
1529 case 0x31: /* A+B LNA2 */
1530 ant_conf->fast_div_bias = 0x1;
1531 ant_conf->main_gaintb = 0;
1532 ant_conf->alt_gaintb = 0;
1533 break;
1534 case 0x32: /* A+B LNA1 */
1535 ant_conf->fast_div_bias = 0x1;
1536 ant_conf->main_gaintb = 0;
1537 ant_conf->alt_gaintb = 0;
1538 break;
1539 default:
1540 break;
1541 }
1542 }
1543 }
1544
1545 /* Antenna diversity and combining */
1546 static void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs)
1547 {
1548 struct ath_hw_antcomb_conf div_ant_conf;
1549 struct ath_ant_comb *antcomb = &sc->ant_comb;
1550 int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set;
1551 int curr_main_set;
1552 int main_rssi = rs->rs_rssi_ctl0;
1553 int alt_rssi = rs->rs_rssi_ctl1;
1554 int rx_ant_conf, main_ant_conf;
1555 bool short_scan = false;
1556
1557 rx_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_CURRENT_SHIFT) &
1558 ATH_ANT_RX_MASK;
1559 main_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_MAIN_SHIFT) &
1560 ATH_ANT_RX_MASK;
1561
1562 /* Record packet only when both main_rssi and alt_rssi is positive */
1563 if (main_rssi > 0 && alt_rssi > 0) {
1564 antcomb->total_pkt_count++;
1565 antcomb->main_total_rssi += main_rssi;
1566 antcomb->alt_total_rssi += alt_rssi;
1567 if (main_ant_conf == rx_ant_conf)
1568 antcomb->main_recv_cnt++;
1569 else
1570 antcomb->alt_recv_cnt++;
1571 }
1572
1573 /* Short scan check */
1574 if (antcomb->scan && antcomb->alt_good) {
1575 if (time_after(jiffies, antcomb->scan_start_time +
1576 msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR)))
1577 short_scan = true;
1578 else
1579 if (antcomb->total_pkt_count ==
1580 ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT) {
1581 alt_ratio = ((antcomb->alt_recv_cnt * 100) /
1582 antcomb->total_pkt_count);
1583 if (alt_ratio < ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
1584 short_scan = true;
1585 }
1586 }
1587
1588 if (((antcomb->total_pkt_count < ATH_ANT_DIV_COMB_MAX_PKTCOUNT) ||
1589 rs->rs_moreaggr) && !short_scan)
1590 return;
1591
1592 if (antcomb->total_pkt_count) {
1593 alt_ratio = ((antcomb->alt_recv_cnt * 100) /
1594 antcomb->total_pkt_count);
1595 main_rssi_avg = (antcomb->main_total_rssi /
1596 antcomb->total_pkt_count);
1597 alt_rssi_avg = (antcomb->alt_total_rssi /
1598 antcomb->total_pkt_count);
1599 }
1600
1601
1602 ath9k_hw_antdiv_comb_conf_get(sc->sc_ah, &div_ant_conf);
1603 curr_alt_set = div_ant_conf.alt_lna_conf;
1604 curr_main_set = div_ant_conf.main_lna_conf;
1605
1606 antcomb->count++;
1607
1608 if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) {
1609 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
1610 ath_lnaconf_alt_good_scan(antcomb, div_ant_conf,
1611 main_rssi_avg);
1612 antcomb->alt_good = true;
1613 } else {
1614 antcomb->alt_good = false;
1615 }
1616
1617 antcomb->count = 0;
1618 antcomb->scan = true;
1619 antcomb->scan_not_start = true;
1620 }
1621
1622 if (!antcomb->scan) {
1623 if (ath_ant_div_comb_alt_check(div_ant_conf.div_group,
1624 alt_ratio, curr_main_set, curr_alt_set,
1625 alt_rssi_avg, main_rssi_avg)) {
1626 if (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) {
1627 /* Switch main and alt LNA */
1628 div_ant_conf.main_lna_conf =
1629 ATH_ANT_DIV_COMB_LNA2;
1630 div_ant_conf.alt_lna_conf =
1631 ATH_ANT_DIV_COMB_LNA1;
1632 } else if (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) {
1633 div_ant_conf.main_lna_conf =
1634 ATH_ANT_DIV_COMB_LNA1;
1635 div_ant_conf.alt_lna_conf =
1636 ATH_ANT_DIV_COMB_LNA2;
1637 }
1638
1639 goto div_comb_done;
1640 } else if ((curr_alt_set != ATH_ANT_DIV_COMB_LNA1) &&
1641 (curr_alt_set != ATH_ANT_DIV_COMB_LNA2)) {
1642 /* Set alt to another LNA */
1643 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2)
1644 div_ant_conf.alt_lna_conf =
1645 ATH_ANT_DIV_COMB_LNA1;
1646 else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1)
1647 div_ant_conf.alt_lna_conf =
1648 ATH_ANT_DIV_COMB_LNA2;
1649
1650 goto div_comb_done;
1651 }
1652
1653 if ((alt_rssi_avg < (main_rssi_avg +
1654 div_ant_conf.lna1_lna2_delta)))
1655 goto div_comb_done;
1656 }
1657
1658 if (!antcomb->scan_not_start) {
1659 switch (curr_alt_set) {
1660 case ATH_ANT_DIV_COMB_LNA2:
1661 antcomb->rssi_lna2 = alt_rssi_avg;
1662 antcomb->rssi_lna1 = main_rssi_avg;
1663 antcomb->scan = true;
1664 /* set to A+B */
1665 div_ant_conf.main_lna_conf =
1666 ATH_ANT_DIV_COMB_LNA1;
1667 div_ant_conf.alt_lna_conf =
1668 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1669 break;
1670 case ATH_ANT_DIV_COMB_LNA1:
1671 antcomb->rssi_lna1 = alt_rssi_avg;
1672 antcomb->rssi_lna2 = main_rssi_avg;
1673 antcomb->scan = true;
1674 /* set to A+B */
1675 div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
1676 div_ant_conf.alt_lna_conf =
1677 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1678 break;
1679 case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2:
1680 antcomb->rssi_add = alt_rssi_avg;
1681 antcomb->scan = true;
1682 /* set to A-B */
1683 div_ant_conf.alt_lna_conf =
1684 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1685 break;
1686 case ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2:
1687 antcomb->rssi_sub = alt_rssi_avg;
1688 antcomb->scan = false;
1689 if (antcomb->rssi_lna2 >
1690 (antcomb->rssi_lna1 +
1691 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)) {
1692 /* use LNA2 as main LNA */
1693 if ((antcomb->rssi_add > antcomb->rssi_lna1) &&
1694 (antcomb->rssi_add > antcomb->rssi_sub)) {
1695 /* set to A+B */
1696 div_ant_conf.main_lna_conf =
1697 ATH_ANT_DIV_COMB_LNA2;
1698 div_ant_conf.alt_lna_conf =
1699 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1700 } else if (antcomb->rssi_sub >
1701 antcomb->rssi_lna1) {
1702 /* set to A-B */
1703 div_ant_conf.main_lna_conf =
1704 ATH_ANT_DIV_COMB_LNA2;
1705 div_ant_conf.alt_lna_conf =
1706 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1707 } else {
1708 /* set to LNA1 */
1709 div_ant_conf.main_lna_conf =
1710 ATH_ANT_DIV_COMB_LNA2;
1711 div_ant_conf.alt_lna_conf =
1712 ATH_ANT_DIV_COMB_LNA1;
1713 }
1714 } else {
1715 /* use LNA1 as main LNA */
1716 if ((antcomb->rssi_add > antcomb->rssi_lna2) &&
1717 (antcomb->rssi_add > antcomb->rssi_sub)) {
1718 /* set to A+B */
1719 div_ant_conf.main_lna_conf =
1720 ATH_ANT_DIV_COMB_LNA1;
1721 div_ant_conf.alt_lna_conf =
1722 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
1723 } else if (antcomb->rssi_sub >
1724 antcomb->rssi_lna1) {
1725 /* set to A-B */
1726 div_ant_conf.main_lna_conf =
1727 ATH_ANT_DIV_COMB_LNA1;
1728 div_ant_conf.alt_lna_conf =
1729 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
1730 } else {
1731 /* set to LNA2 */
1732 div_ant_conf.main_lna_conf =
1733 ATH_ANT_DIV_COMB_LNA1;
1734 div_ant_conf.alt_lna_conf =
1735 ATH_ANT_DIV_COMB_LNA2;
1736 }
1737 }
1738 break;
1739 default:
1740 break;
1741 }
1742 } else {
1743 if (!antcomb->alt_good) {
1744 antcomb->scan_not_start = false;
1745 /* Set alt to another LNA */
1746 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) {
1747 div_ant_conf.main_lna_conf =
1748 ATH_ANT_DIV_COMB_LNA2;
1749 div_ant_conf.alt_lna_conf =
1750 ATH_ANT_DIV_COMB_LNA1;
1751 } else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) {
1752 div_ant_conf.main_lna_conf =
1753 ATH_ANT_DIV_COMB_LNA1;
1754 div_ant_conf.alt_lna_conf =
1755 ATH_ANT_DIV_COMB_LNA2;
1756 }
1757 goto div_comb_done;
1758 }
1759 }
1760
1761 ath_select_ant_div_from_quick_scan(antcomb, &div_ant_conf,
1762 main_rssi_avg, alt_rssi_avg,
1763 alt_ratio);
1764
1765 antcomb->quick_scan_cnt++;
1766
1767 div_comb_done:
1768 ath_ant_div_conf_fast_divbias(&div_ant_conf, antcomb, alt_ratio);
1769 ath9k_hw_antdiv_comb_conf_set(sc->sc_ah, &div_ant_conf);
1770
1771 antcomb->scan_start_time = jiffies;
1772 antcomb->total_pkt_count = 0;
1773 antcomb->main_total_rssi = 0;
1774 antcomb->alt_total_rssi = 0;
1775 antcomb->main_recv_cnt = 0;
1776 antcomb->alt_recv_cnt = 0;
1777 }
1778
1779 int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
1780 {
1781 struct ath_buf *bf;
1782 struct sk_buff *skb = NULL, *requeue_skb, *hdr_skb;
1783 struct ieee80211_rx_status *rxs;
1784 struct ath_hw *ah = sc->sc_ah;
1785 struct ath_common *common = ath9k_hw_common(ah);
1786 /*
1787 * The hw can technically differ from common->hw when using ath9k
1788 * virtual wiphy so to account for that we iterate over the active
1789 * wiphys and find the appropriate wiphy and therefore hw.
1790 */
1791 struct ieee80211_hw *hw = sc->hw;
1792 struct ieee80211_hdr *hdr;
1793 int retval;
1794 bool decrypt_error = false;
1795 struct ath_rx_status rs;
1796 enum ath9k_rx_qtype qtype;
1797 bool edma = !!(ah->caps.hw_caps & ATH9K_HW_CAP_EDMA);
1798 int dma_type;
1799 u8 rx_status_len = ah->caps.rx_status_len;
1800 u64 tsf = 0;
1801 u32 tsf_lower = 0;
1802 unsigned long flags;
1803
1804 if (edma)
1805 dma_type = DMA_BIDIRECTIONAL;
1806 else
1807 dma_type = DMA_FROM_DEVICE;
1808
1809 qtype = hp ? ATH9K_RX_QUEUE_HP : ATH9K_RX_QUEUE_LP;
1810 spin_lock_bh(&sc->rx.rxbuflock);
1811
1812 tsf = ath9k_hw_gettsf64(ah);
1813 tsf_lower = tsf & 0xffffffff;
1814
1815 do {
1816 /* If handling rx interrupt and flush is in progress => exit */
1817 if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0))
1818 break;
1819
1820 memset(&rs, 0, sizeof(rs));
1821 if (edma)
1822 bf = ath_edma_get_next_rx_buf(sc, &rs, qtype);
1823 else
1824 bf = ath_get_next_rx_buf(sc, &rs);
1825
1826 if (!bf)
1827 break;
1828
1829 skb = bf->bf_mpdu;
1830 if (!skb)
1831 continue;
1832
1833 /*
1834 * Take frame header from the first fragment and RX status from
1835 * the last one.
1836 */
1837 if (sc->rx.frag)
1838 hdr_skb = sc->rx.frag;
1839 else
1840 hdr_skb = skb;
1841
1842 hdr = (struct ieee80211_hdr *) (hdr_skb->data + rx_status_len);
1843 rxs = IEEE80211_SKB_RXCB(hdr_skb);
1844
1845 ath_debug_stat_rx(sc, &rs);
1846
1847 /*
1848 * If we're asked to flush receive queue, directly
1849 * chain it back at the queue without processing it.
1850 */
1851 if (flush)
1852 goto requeue_drop_frag;
1853
1854 retval = ath9k_rx_skb_preprocess(common, hw, hdr, &rs,
1855 rxs, &decrypt_error);
1856 if (retval)
1857 goto requeue_drop_frag;
1858
1859 rxs->mactime = (tsf & ~0xffffffffULL) | rs.rs_tstamp;
1860 if (rs.rs_tstamp > tsf_lower &&
1861 unlikely(rs.rs_tstamp - tsf_lower > 0x10000000))
1862 rxs->mactime -= 0x100000000ULL;
1863
1864 if (rs.rs_tstamp < tsf_lower &&
1865 unlikely(tsf_lower - rs.rs_tstamp > 0x10000000))
1866 rxs->mactime += 0x100000000ULL;
1867
1868 /* Ensure we always have an skb to requeue once we are done
1869 * processing the current buffer's skb */
1870 requeue_skb = ath_rxbuf_alloc(common, common->rx_bufsize, GFP_ATOMIC);
1871
1872 /* If there is no memory we ignore the current RX'd frame,
1873 * tell hardware it can give us a new frame using the old
1874 * skb and put it at the tail of the sc->rx.rxbuf list for
1875 * processing. */
1876 if (!requeue_skb)
1877 goto requeue_drop_frag;
1878
1879 /* Unmap the frame */
1880 dma_unmap_single(sc->dev, bf->bf_buf_addr,
1881 common->rx_bufsize,
1882 dma_type);
1883
1884 skb_put(skb, rs.rs_datalen + ah->caps.rx_status_len);
1885 if (ah->caps.rx_status_len)
1886 skb_pull(skb, ah->caps.rx_status_len);
1887
1888 if (!rs.rs_more)
1889 ath9k_rx_skb_postprocess(common, hdr_skb, &rs,
1890 rxs, decrypt_error);
1891
1892 /* We will now give hardware our shiny new allocated skb */
1893 bf->bf_mpdu = requeue_skb;
1894 bf->bf_buf_addr = dma_map_single(sc->dev, requeue_skb->data,
1895 common->rx_bufsize,
1896 dma_type);
1897 if (unlikely(dma_mapping_error(sc->dev,
1898 bf->bf_buf_addr))) {
1899 dev_kfree_skb_any(requeue_skb);
1900 bf->bf_mpdu = NULL;
1901 bf->bf_buf_addr = 0;
1902 ath_err(common, "dma_mapping_error() on RX\n");
1903 ieee80211_rx(hw, skb);
1904 break;
1905 }
1906
1907 if (rs.rs_more) {
1908 /*
1909 * rs_more indicates chained descriptors which can be
1910 * used to link buffers together for a sort of
1911 * scatter-gather operation.
1912 */
1913 if (sc->rx.frag) {
1914 /* too many fragments - cannot handle frame */
1915 dev_kfree_skb_any(sc->rx.frag);
1916 dev_kfree_skb_any(skb);
1917 skb = NULL;
1918 }
1919 sc->rx.frag = skb;
1920 goto requeue;
1921 }
1922
1923 if (sc->rx.frag) {
1924 int space = skb->len - skb_tailroom(hdr_skb);
1925
1926 sc->rx.frag = NULL;
1927
1928 if (pskb_expand_head(hdr_skb, 0, space, GFP_ATOMIC) < 0) {
1929 dev_kfree_skb(skb);
1930 goto requeue_drop_frag;
1931 }
1932
1933 skb_copy_from_linear_data(skb, skb_put(hdr_skb, skb->len),
1934 skb->len);
1935 dev_kfree_skb_any(skb);
1936 skb = hdr_skb;
1937 }
1938
1939 /*
1940 * change the default rx antenna if rx diversity chooses the
1941 * other antenna 3 times in a row.
1942 */
1943 if (sc->rx.defant != rs.rs_antenna) {
1944 if (++sc->rx.rxotherant >= 3)
1945 ath_setdefantenna(sc, rs.rs_antenna);
1946 } else {
1947 sc->rx.rxotherant = 0;
1948 }
1949
1950 if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
1951 skb_trim(skb, skb->len - 8);
1952
1953 spin_lock_irqsave(&sc->sc_pm_lock, flags);
1954
1955 if ((sc->ps_flags & (PS_WAIT_FOR_BEACON |
1956 PS_WAIT_FOR_CAB |
1957 PS_WAIT_FOR_PSPOLL_DATA)) ||
1958 ath9k_check_auto_sleep(sc))
1959 ath_rx_ps(sc, skb);
1960 spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
1961
1962 if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)
1963 ath_ant_comb_scan(sc, &rs);
1964
1965 ieee80211_rx(hw, skb);
1966
1967 requeue_drop_frag:
1968 if (sc->rx.frag) {
1969 dev_kfree_skb_any(sc->rx.frag);
1970 sc->rx.frag = NULL;
1971 }
1972 requeue:
1973 if (edma) {
1974 list_add_tail(&bf->list, &sc->rx.rxbuf);
1975 ath_rx_edma_buf_link(sc, qtype);
1976 } else {
1977 list_move_tail(&bf->list, &sc->rx.rxbuf);
1978 ath_rx_buf_link(sc, bf);
1979 ath9k_hw_rxena(ah);
1980 }
1981 } while (1);
1982
1983 spin_unlock_bh(&sc->rx.rxbuflock);
1984
1985 return 0;
1986 }
linux-next