xref: /openbmc/linux/drivers/net/wireless/ath/ath9k/ar9003_mac.c (revision ce932d0c5589e9766e089c22c66890dfc48fbd94)
1 /*
2  * Copyright (c) 2010-2011 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 #include <linux/export.h>
17 #include "hw.h"
18 #include "ar9003_mac.h"
19 #include "ar9003_mci.h"
20 
21 static void ar9003_hw_rx_enable(struct ath_hw *hw)
22 {
23 	REG_WRITE(hw, AR_CR, 0);
24 }
25 
26 static void
27 ar9003_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i)
28 {
29 	struct ar9003_txc *ads = ds;
30 	int checksum = 0;
31 	u32 val, ctl12, ctl17;
32 	u8 desc_len;
33 
34 	desc_len = (AR_SREV_9462(ah) ? 0x18 : 0x17);
35 
36 	val = (ATHEROS_VENDOR_ID << AR_DescId_S) |
37 	      (1 << AR_TxRxDesc_S) |
38 	      (1 << AR_CtrlStat_S) |
39 	      (i->qcu << AR_TxQcuNum_S) | desc_len;
40 
41 	checksum += val;
42 	ACCESS_ONCE(ads->info) = val;
43 
44 	checksum += i->link;
45 	ACCESS_ONCE(ads->link) = i->link;
46 
47 	checksum += i->buf_addr[0];
48 	ACCESS_ONCE(ads->data0) = i->buf_addr[0];
49 	checksum += i->buf_addr[1];
50 	ACCESS_ONCE(ads->data1) = i->buf_addr[1];
51 	checksum += i->buf_addr[2];
52 	ACCESS_ONCE(ads->data2) = i->buf_addr[2];
53 	checksum += i->buf_addr[3];
54 	ACCESS_ONCE(ads->data3) = i->buf_addr[3];
55 
56 	checksum += (val = (i->buf_len[0] << AR_BufLen_S) & AR_BufLen);
57 	ACCESS_ONCE(ads->ctl3) = val;
58 	checksum += (val = (i->buf_len[1] << AR_BufLen_S) & AR_BufLen);
59 	ACCESS_ONCE(ads->ctl5) = val;
60 	checksum += (val = (i->buf_len[2] << AR_BufLen_S) & AR_BufLen);
61 	ACCESS_ONCE(ads->ctl7) = val;
62 	checksum += (val = (i->buf_len[3] << AR_BufLen_S) & AR_BufLen);
63 	ACCESS_ONCE(ads->ctl9) = val;
64 
65 	checksum = (u16) (((checksum & 0xffff) + (checksum >> 16)) & 0xffff);
66 	ACCESS_ONCE(ads->ctl10) = checksum;
67 
68 	if (i->is_first || i->is_last) {
69 		ACCESS_ONCE(ads->ctl13) = set11nTries(i->rates, 0)
70 			| set11nTries(i->rates, 1)
71 			| set11nTries(i->rates, 2)
72 			| set11nTries(i->rates, 3)
73 			| (i->dur_update ? AR_DurUpdateEna : 0)
74 			| SM(0, AR_BurstDur);
75 
76 		ACCESS_ONCE(ads->ctl14) = set11nRate(i->rates, 0)
77 			| set11nRate(i->rates, 1)
78 			| set11nRate(i->rates, 2)
79 			| set11nRate(i->rates, 3);
80 	} else {
81 		ACCESS_ONCE(ads->ctl13) = 0;
82 		ACCESS_ONCE(ads->ctl14) = 0;
83 	}
84 
85 	ads->ctl20 = 0;
86 	ads->ctl21 = 0;
87 	ads->ctl22 = 0;
88 	ads->ctl23 = 0;
89 
90 	ctl17 = SM(i->keytype, AR_EncrType);
91 	if (!i->is_first) {
92 		ACCESS_ONCE(ads->ctl11) = 0;
93 		ACCESS_ONCE(ads->ctl12) = i->is_last ? 0 : AR_TxMore;
94 		ACCESS_ONCE(ads->ctl15) = 0;
95 		ACCESS_ONCE(ads->ctl16) = 0;
96 		ACCESS_ONCE(ads->ctl17) = ctl17;
97 		ACCESS_ONCE(ads->ctl18) = 0;
98 		ACCESS_ONCE(ads->ctl19) = 0;
99 		return;
100 	}
101 
102 	ACCESS_ONCE(ads->ctl11) = (i->pkt_len & AR_FrameLen)
103 		| (i->flags & ATH9K_TXDESC_VMF ? AR_VirtMoreFrag : 0)
104 		| SM(i->txpower, AR_XmitPower)
105 		| (i->flags & ATH9K_TXDESC_VEOL ? AR_VEOL : 0)
106 		| (i->keyix != ATH9K_TXKEYIX_INVALID ? AR_DestIdxValid : 0)
107 		| (i->flags & ATH9K_TXDESC_LOWRXCHAIN ? AR_LowRxChain : 0)
108 		| (i->flags & ATH9K_TXDESC_CLRDMASK ? AR_ClrDestMask : 0)
109 		| (i->flags & ATH9K_TXDESC_RTSENA ? AR_RTSEnable :
110 		   (i->flags & ATH9K_TXDESC_CTSENA ? AR_CTSEnable : 0));
111 
112 	ctl12 = (i->keyix != ATH9K_TXKEYIX_INVALID ?
113 		 SM(i->keyix, AR_DestIdx) : 0)
114 		| SM(i->type, AR_FrameType)
115 		| (i->flags & ATH9K_TXDESC_NOACK ? AR_NoAck : 0)
116 		| (i->flags & ATH9K_TXDESC_EXT_ONLY ? AR_ExtOnly : 0)
117 		| (i->flags & ATH9K_TXDESC_EXT_AND_CTL ? AR_ExtAndCtl : 0);
118 
119 	ctl17 |= (i->flags & ATH9K_TXDESC_LDPC ? AR_LDPC : 0);
120 	switch (i->aggr) {
121 	case AGGR_BUF_FIRST:
122 		ctl17 |= SM(i->aggr_len, AR_AggrLen);
123 		/* fall through */
124 	case AGGR_BUF_MIDDLE:
125 		ctl12 |= AR_IsAggr | AR_MoreAggr;
126 		ctl17 |= SM(i->ndelim, AR_PadDelim);
127 		break;
128 	case AGGR_BUF_LAST:
129 		ctl12 |= AR_IsAggr;
130 		break;
131 	case AGGR_BUF_NONE:
132 		break;
133 	}
134 
135 	val = (i->flags & ATH9K_TXDESC_PAPRD) >> ATH9K_TXDESC_PAPRD_S;
136 	ctl12 |= SM(val, AR_PAPRDChainMask);
137 
138 	ACCESS_ONCE(ads->ctl12) = ctl12;
139 	ACCESS_ONCE(ads->ctl17) = ctl17;
140 
141 	ACCESS_ONCE(ads->ctl15) = set11nPktDurRTSCTS(i->rates, 0)
142 		| set11nPktDurRTSCTS(i->rates, 1);
143 
144 	ACCESS_ONCE(ads->ctl16) = set11nPktDurRTSCTS(i->rates, 2)
145 		| set11nPktDurRTSCTS(i->rates, 3);
146 
147 	ACCESS_ONCE(ads->ctl18) = set11nRateFlags(i->rates, 0)
148 		| set11nRateFlags(i->rates, 1)
149 		| set11nRateFlags(i->rates, 2)
150 		| set11nRateFlags(i->rates, 3)
151 		| SM(i->rtscts_rate, AR_RTSCTSRate);
152 
153 	ACCESS_ONCE(ads->ctl19) = AR_Not_Sounding;
154 }
155 
156 static u16 ar9003_calc_ptr_chksum(struct ar9003_txc *ads)
157 {
158 	int checksum;
159 
160 	checksum = ads->info + ads->link
161 		+ ads->data0 + ads->ctl3
162 		+ ads->data1 + ads->ctl5
163 		+ ads->data2 + ads->ctl7
164 		+ ads->data3 + ads->ctl9;
165 
166 	return ((checksum & 0xffff) + (checksum >> 16)) & AR_TxPtrChkSum;
167 }
168 
169 static void ar9003_hw_set_desc_link(void *ds, u32 ds_link)
170 {
171 	struct ar9003_txc *ads = ds;
172 
173 	ads->link = ds_link;
174 	ads->ctl10 &= ~AR_TxPtrChkSum;
175 	ads->ctl10 |= ar9003_calc_ptr_chksum(ads);
176 }
177 
178 static bool ar9003_hw_get_isr(struct ath_hw *ah, enum ath9k_int *masked)
179 {
180 	u32 isr = 0;
181 	u32 mask2 = 0;
182 	struct ath9k_hw_capabilities *pCap = &ah->caps;
183 	struct ath_common *common = ath9k_hw_common(ah);
184 	u32 sync_cause = 0, async_cause;
185 
186 	async_cause = REG_READ(ah, AR_INTR_ASYNC_CAUSE);
187 
188 	if (async_cause & (AR_INTR_MAC_IRQ | AR_INTR_ASYNC_MASK_MCI)) {
189 		if ((REG_READ(ah, AR_RTC_STATUS) & AR_RTC_STATUS_M)
190 				== AR_RTC_STATUS_ON)
191 			isr = REG_READ(ah, AR_ISR);
192 	}
193 
194 
195 	sync_cause = REG_READ(ah, AR_INTR_SYNC_CAUSE) & AR_INTR_SYNC_DEFAULT;
196 
197 	*masked = 0;
198 
199 	if (!isr && !sync_cause && !async_cause)
200 		return false;
201 
202 	if (isr) {
203 		if (isr & AR_ISR_BCNMISC) {
204 			u32 isr2;
205 			isr2 = REG_READ(ah, AR_ISR_S2);
206 
207 			mask2 |= ((isr2 & AR_ISR_S2_TIM) >>
208 				  MAP_ISR_S2_TIM);
209 			mask2 |= ((isr2 & AR_ISR_S2_DTIM) >>
210 				  MAP_ISR_S2_DTIM);
211 			mask2 |= ((isr2 & AR_ISR_S2_DTIMSYNC) >>
212 				  MAP_ISR_S2_DTIMSYNC);
213 			mask2 |= ((isr2 & AR_ISR_S2_CABEND) >>
214 				  MAP_ISR_S2_CABEND);
215 			mask2 |= ((isr2 & AR_ISR_S2_GTT) <<
216 				  MAP_ISR_S2_GTT);
217 			mask2 |= ((isr2 & AR_ISR_S2_CST) <<
218 				  MAP_ISR_S2_CST);
219 			mask2 |= ((isr2 & AR_ISR_S2_TSFOOR) >>
220 				  MAP_ISR_S2_TSFOOR);
221 			mask2 |= ((isr2 & AR_ISR_S2_BB_WATCHDOG) >>
222 				  MAP_ISR_S2_BB_WATCHDOG);
223 
224 			if (!(pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)) {
225 				REG_WRITE(ah, AR_ISR_S2, isr2);
226 				isr &= ~AR_ISR_BCNMISC;
227 			}
228 		}
229 
230 		if ((pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED))
231 			isr = REG_READ(ah, AR_ISR_RAC);
232 
233 		if (isr == 0xffffffff) {
234 			*masked = 0;
235 			return false;
236 		}
237 
238 		*masked = isr & ATH9K_INT_COMMON;
239 
240 		if (ah->config.rx_intr_mitigation)
241 			if (isr & (AR_ISR_RXMINTR | AR_ISR_RXINTM))
242 				*masked |= ATH9K_INT_RXLP;
243 
244 		if (ah->config.tx_intr_mitigation)
245 			if (isr & (AR_ISR_TXMINTR | AR_ISR_TXINTM))
246 				*masked |= ATH9K_INT_TX;
247 
248 		if (isr & (AR_ISR_LP_RXOK | AR_ISR_RXERR))
249 			*masked |= ATH9K_INT_RXLP;
250 
251 		if (isr & AR_ISR_HP_RXOK)
252 			*masked |= ATH9K_INT_RXHP;
253 
254 		if (isr & (AR_ISR_TXOK | AR_ISR_TXERR | AR_ISR_TXEOL)) {
255 			*masked |= ATH9K_INT_TX;
256 
257 			if (!(pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)) {
258 				u32 s0, s1;
259 				s0 = REG_READ(ah, AR_ISR_S0);
260 				REG_WRITE(ah, AR_ISR_S0, s0);
261 				s1 = REG_READ(ah, AR_ISR_S1);
262 				REG_WRITE(ah, AR_ISR_S1, s1);
263 
264 				isr &= ~(AR_ISR_TXOK | AR_ISR_TXERR |
265 					 AR_ISR_TXEOL);
266 			}
267 		}
268 
269 		if (isr & AR_ISR_GENTMR) {
270 			u32 s5;
271 
272 			if (pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)
273 				s5 = REG_READ(ah, AR_ISR_S5_S);
274 			else
275 				s5 = REG_READ(ah, AR_ISR_S5);
276 
277 			ah->intr_gen_timer_trigger =
278 				MS(s5, AR_ISR_S5_GENTIMER_TRIG);
279 
280 			ah->intr_gen_timer_thresh =
281 				MS(s5, AR_ISR_S5_GENTIMER_THRESH);
282 
283 			if (ah->intr_gen_timer_trigger)
284 				*masked |= ATH9K_INT_GENTIMER;
285 
286 			if (!(pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)) {
287 				REG_WRITE(ah, AR_ISR_S5, s5);
288 				isr &= ~AR_ISR_GENTMR;
289 			}
290 
291 		}
292 
293 		*masked |= mask2;
294 
295 		if (!(pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)) {
296 			REG_WRITE(ah, AR_ISR, isr);
297 
298 			(void) REG_READ(ah, AR_ISR);
299 		}
300 
301 		if (*masked & ATH9K_INT_BB_WATCHDOG)
302 			ar9003_hw_bb_watchdog_read(ah);
303 	}
304 
305 	if (async_cause & AR_INTR_ASYNC_MASK_MCI)
306 		ar9003_mci_get_isr(ah, masked);
307 
308 	if (sync_cause) {
309 		if (sync_cause & AR_INTR_SYNC_RADM_CPL_TIMEOUT) {
310 			REG_WRITE(ah, AR_RC, AR_RC_HOSTIF);
311 			REG_WRITE(ah, AR_RC, 0);
312 			*masked |= ATH9K_INT_FATAL;
313 		}
314 
315 		if (sync_cause & AR_INTR_SYNC_LOCAL_TIMEOUT)
316 			ath_dbg(common, INTERRUPT,
317 				"AR_INTR_SYNC_LOCAL_TIMEOUT\n");
318 
319 		REG_WRITE(ah, AR_INTR_SYNC_CAUSE_CLR, sync_cause);
320 		(void) REG_READ(ah, AR_INTR_SYNC_CAUSE_CLR);
321 
322 	}
323 	return true;
324 }
325 
326 static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds,
327 				 struct ath_tx_status *ts)
328 {
329 	struct ar9003_txs *ads;
330 	u32 status;
331 
332 	ads = &ah->ts_ring[ah->ts_tail];
333 
334 	status = ACCESS_ONCE(ads->status8);
335 	if ((status & AR_TxDone) == 0)
336 		return -EINPROGRESS;
337 
338 	ah->ts_tail = (ah->ts_tail + 1) % ah->ts_size;
339 
340 	if ((MS(ads->ds_info, AR_DescId) != ATHEROS_VENDOR_ID) ||
341 	    (MS(ads->ds_info, AR_TxRxDesc) != 1)) {
342 		ath_dbg(ath9k_hw_common(ah), XMIT,
343 			"Tx Descriptor error %x\n", ads->ds_info);
344 		memset(ads, 0, sizeof(*ads));
345 		return -EIO;
346 	}
347 
348 	ts->ts_rateindex = MS(status, AR_FinalTxIdx);
349 	ts->ts_seqnum = MS(status, AR_SeqNum);
350 	ts->tid = MS(status, AR_TxTid);
351 
352 	ts->qid = MS(ads->ds_info, AR_TxQcuNum);
353 	ts->desc_id = MS(ads->status1, AR_TxDescId);
354 	ts->ts_tstamp = ads->status4;
355 	ts->ts_status = 0;
356 	ts->ts_flags  = 0;
357 
358 	if (status & AR_TxOpExceeded)
359 		ts->ts_status |= ATH9K_TXERR_XTXOP;
360 	status = ACCESS_ONCE(ads->status2);
361 	ts->ts_rssi_ctl0 = MS(status, AR_TxRSSIAnt00);
362 	ts->ts_rssi_ctl1 = MS(status, AR_TxRSSIAnt01);
363 	ts->ts_rssi_ctl2 = MS(status, AR_TxRSSIAnt02);
364 	if (status & AR_TxBaStatus) {
365 		ts->ts_flags |= ATH9K_TX_BA;
366 		ts->ba_low = ads->status5;
367 		ts->ba_high = ads->status6;
368 	}
369 
370 	status = ACCESS_ONCE(ads->status3);
371 	if (status & AR_ExcessiveRetries)
372 		ts->ts_status |= ATH9K_TXERR_XRETRY;
373 	if (status & AR_Filtered)
374 		ts->ts_status |= ATH9K_TXERR_FILT;
375 	if (status & AR_FIFOUnderrun) {
376 		ts->ts_status |= ATH9K_TXERR_FIFO;
377 		ath9k_hw_updatetxtriglevel(ah, true);
378 	}
379 	if (status & AR_TxTimerExpired)
380 		ts->ts_status |= ATH9K_TXERR_TIMER_EXPIRED;
381 	if (status & AR_DescCfgErr)
382 		ts->ts_flags |= ATH9K_TX_DESC_CFG_ERR;
383 	if (status & AR_TxDataUnderrun) {
384 		ts->ts_flags |= ATH9K_TX_DATA_UNDERRUN;
385 		ath9k_hw_updatetxtriglevel(ah, true);
386 	}
387 	if (status & AR_TxDelimUnderrun) {
388 		ts->ts_flags |= ATH9K_TX_DELIM_UNDERRUN;
389 		ath9k_hw_updatetxtriglevel(ah, true);
390 	}
391 	ts->ts_shortretry = MS(status, AR_RTSFailCnt);
392 	ts->ts_longretry = MS(status, AR_DataFailCnt);
393 	ts->ts_virtcol = MS(status, AR_VirtRetryCnt);
394 
395 	status = ACCESS_ONCE(ads->status7);
396 	ts->ts_rssi = MS(status, AR_TxRSSICombined);
397 	ts->ts_rssi_ext0 = MS(status, AR_TxRSSIAnt10);
398 	ts->ts_rssi_ext1 = MS(status, AR_TxRSSIAnt11);
399 	ts->ts_rssi_ext2 = MS(status, AR_TxRSSIAnt12);
400 
401 	memset(ads, 0, sizeof(*ads));
402 
403 	return 0;
404 }
405 
406 void ar9003_hw_attach_mac_ops(struct ath_hw *hw)
407 {
408 	struct ath_hw_ops *ops = ath9k_hw_ops(hw);
409 
410 	ops->rx_enable = ar9003_hw_rx_enable;
411 	ops->set_desc_link = ar9003_hw_set_desc_link;
412 	ops->get_isr = ar9003_hw_get_isr;
413 	ops->set_txdesc = ar9003_set_txdesc;
414 	ops->proc_txdesc = ar9003_hw_proc_txdesc;
415 }
416 
417 void ath9k_hw_set_rx_bufsize(struct ath_hw *ah, u16 buf_size)
418 {
419 	REG_WRITE(ah, AR_DATABUF_SIZE, buf_size & AR_DATABUF_SIZE_MASK);
420 }
421 EXPORT_SYMBOL(ath9k_hw_set_rx_bufsize);
422 
423 void ath9k_hw_addrxbuf_edma(struct ath_hw *ah, u32 rxdp,
424 			    enum ath9k_rx_qtype qtype)
425 {
426 	if (qtype == ATH9K_RX_QUEUE_HP)
427 		REG_WRITE(ah, AR_HP_RXDP, rxdp);
428 	else
429 		REG_WRITE(ah, AR_LP_RXDP, rxdp);
430 }
431 EXPORT_SYMBOL(ath9k_hw_addrxbuf_edma);
432 
433 int ath9k_hw_process_rxdesc_edma(struct ath_hw *ah, struct ath_rx_status *rxs,
434 				 void *buf_addr)
435 {
436 	struct ar9003_rxs *rxsp = (struct ar9003_rxs *) buf_addr;
437 	unsigned int phyerr;
438 
439 	if ((rxsp->status11 & AR_RxDone) == 0)
440 		return -EINPROGRESS;
441 
442 	if (MS(rxsp->ds_info, AR_DescId) != 0x168c)
443 		return -EINVAL;
444 
445 	if ((rxsp->ds_info & (AR_TxRxDesc | AR_CtrlStat)) != 0)
446 		return -EINPROGRESS;
447 
448 	rxs->rs_status = 0;
449 	rxs->rs_flags =  0;
450 
451 	rxs->rs_datalen = rxsp->status2 & AR_DataLen;
452 	rxs->rs_tstamp =  rxsp->status3;
453 
454 	/* XXX: Keycache */
455 	rxs->rs_rssi = MS(rxsp->status5, AR_RxRSSICombined);
456 	rxs->rs_rssi_ctl0 = MS(rxsp->status1, AR_RxRSSIAnt00);
457 	rxs->rs_rssi_ctl1 = MS(rxsp->status1, AR_RxRSSIAnt01);
458 	rxs->rs_rssi_ctl2 = MS(rxsp->status1, AR_RxRSSIAnt02);
459 	rxs->rs_rssi_ext0 = MS(rxsp->status5, AR_RxRSSIAnt10);
460 	rxs->rs_rssi_ext1 = MS(rxsp->status5, AR_RxRSSIAnt11);
461 	rxs->rs_rssi_ext2 = MS(rxsp->status5, AR_RxRSSIAnt12);
462 
463 	if (rxsp->status11 & AR_RxKeyIdxValid)
464 		rxs->rs_keyix = MS(rxsp->status11, AR_KeyIdx);
465 	else
466 		rxs->rs_keyix = ATH9K_RXKEYIX_INVALID;
467 
468 	rxs->rs_rate = MS(rxsp->status1, AR_RxRate);
469 	rxs->rs_more = (rxsp->status2 & AR_RxMore) ? 1 : 0;
470 
471 	rxs->rs_isaggr = (rxsp->status11 & AR_RxAggr) ? 1 : 0;
472 	rxs->rs_moreaggr = (rxsp->status11 & AR_RxMoreAggr) ? 1 : 0;
473 	rxs->rs_antenna = (MS(rxsp->status4, AR_RxAntenna) & 0x7);
474 	rxs->rs_flags  = (rxsp->status4 & AR_GI) ? ATH9K_RX_GI : 0;
475 	rxs->rs_flags  |= (rxsp->status4 & AR_2040) ? ATH9K_RX_2040 : 0;
476 
477 	rxs->evm0 = rxsp->status6;
478 	rxs->evm1 = rxsp->status7;
479 	rxs->evm2 = rxsp->status8;
480 	rxs->evm3 = rxsp->status9;
481 	rxs->evm4 = (rxsp->status10 & 0xffff);
482 
483 	if (rxsp->status11 & AR_PreDelimCRCErr)
484 		rxs->rs_flags |= ATH9K_RX_DELIM_CRC_PRE;
485 
486 	if (rxsp->status11 & AR_PostDelimCRCErr)
487 		rxs->rs_flags |= ATH9K_RX_DELIM_CRC_POST;
488 
489 	if (rxsp->status11 & AR_DecryptBusyErr)
490 		rxs->rs_flags |= ATH9K_RX_DECRYPT_BUSY;
491 
492 	if ((rxsp->status11 & AR_RxFrameOK) == 0) {
493 		/*
494 		 * AR_CRCErr will bet set to true if we're on the last
495 		 * subframe and the AR_PostDelimCRCErr is caught.
496 		 * In a way this also gives us a guarantee that when
497 		 * (!(AR_CRCErr) && (AR_PostDelimCRCErr)) we cannot
498 		 * possibly be reviewing the last subframe. AR_CRCErr
499 		 * is the CRC of the actual data.
500 		 */
501 		if (rxsp->status11 & AR_CRCErr)
502 			rxs->rs_status |= ATH9K_RXERR_CRC;
503 		else if (rxsp->status11 & AR_DecryptCRCErr)
504 			rxs->rs_status |= ATH9K_RXERR_DECRYPT;
505 		else if (rxsp->status11 & AR_MichaelErr)
506 			rxs->rs_status |= ATH9K_RXERR_MIC;
507 		if (rxsp->status11 & AR_PHYErr) {
508 			phyerr = MS(rxsp->status11, AR_PHYErrCode);
509 			/*
510 			 * If we reach a point here where AR_PostDelimCRCErr is
511 			 * true it implies we're *not* on the last subframe. In
512 			 * in that case that we know already that the CRC of
513 			 * the frame was OK, and MAC would send an ACK for that
514 			 * subframe, even if we did get a phy error of type
515 			 * ATH9K_PHYERR_OFDM_RESTART. This is only applicable
516 			 * to frame that are prior to the last subframe.
517 			 * The AR_PostDelimCRCErr is the CRC for the MPDU
518 			 * delimiter, which contains the 4 reserved bits,
519 			 * the MPDU length (12 bits), and follows the MPDU
520 			 * delimiter for an A-MPDU subframe (0x4E = 'N' ASCII).
521 			 */
522 			if ((phyerr == ATH9K_PHYERR_OFDM_RESTART) &&
523 			    (rxsp->status11 & AR_PostDelimCRCErr)) {
524 				rxs->rs_phyerr = 0;
525 			} else {
526 				rxs->rs_status |= ATH9K_RXERR_PHY;
527 				rxs->rs_phyerr = phyerr;
528 			}
529 		};
530 	}
531 
532 	if (rxsp->status11 & AR_KeyMiss)
533 		rxs->rs_status |= ATH9K_RXERR_KEYMISS;
534 
535 	return 0;
536 }
537 EXPORT_SYMBOL(ath9k_hw_process_rxdesc_edma);
538 
539 void ath9k_hw_reset_txstatus_ring(struct ath_hw *ah)
540 {
541 	ah->ts_tail = 0;
542 
543 	memset((void *) ah->ts_ring, 0,
544 		ah->ts_size * sizeof(struct ar9003_txs));
545 
546 	ath_dbg(ath9k_hw_common(ah), XMIT,
547 		"TS Start 0x%x End 0x%x Virt %p, Size %d\n",
548 		ah->ts_paddr_start, ah->ts_paddr_end,
549 		ah->ts_ring, ah->ts_size);
550 
551 	REG_WRITE(ah, AR_Q_STATUS_RING_START, ah->ts_paddr_start);
552 	REG_WRITE(ah, AR_Q_STATUS_RING_END, ah->ts_paddr_end);
553 }
554 
555 void ath9k_hw_setup_statusring(struct ath_hw *ah, void *ts_start,
556 			       u32 ts_paddr_start,
557 			       u16 size)
558 {
559 
560 	ah->ts_paddr_start = ts_paddr_start;
561 	ah->ts_paddr_end = ts_paddr_start + (size * sizeof(struct ar9003_txs));
562 	ah->ts_size = size;
563 	ah->ts_ring = (struct ar9003_txs *) ts_start;
564 
565 	ath9k_hw_reset_txstatus_ring(ah);
566 }
567 EXPORT_SYMBOL(ath9k_hw_setup_statusring);
568