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 "hw.h"
18 #include <linux/export.h>
19 
20 #define AR_BufLen           0x00000fff
21 
22 static void ar9002_hw_rx_enable(struct ath_hw *ah)
23 {
24 	REG_WRITE(ah, AR_CR, AR_CR_RXE);
25 }
26 
27 static void ar9002_hw_set_desc_link(void *ds, u32 ds_link)
28 {
29 	((struct ath_desc*) ds)->ds_link = ds_link;
30 }
31 
32 static bool ar9002_hw_get_isr(struct ath_hw *ah, enum ath9k_int *masked,
33 			      u32 *sync_cause_p)
34 {
35 	u32 isr = 0;
36 	u32 mask2 = 0;
37 	struct ath9k_hw_capabilities *pCap = &ah->caps;
38 	u32 sync_cause = 0;
39 	bool fatal_int = false;
40 	struct ath_common *common = ath9k_hw_common(ah);
41 
42 	if (!AR_SREV_9100(ah)) {
43 		if (REG_READ(ah, AR_INTR_ASYNC_CAUSE) & AR_INTR_MAC_IRQ) {
44 			if ((REG_READ(ah, AR_RTC_STATUS) & AR_RTC_STATUS_M)
45 			    == AR_RTC_STATUS_ON) {
46 				isr = REG_READ(ah, AR_ISR);
47 			}
48 		}
49 
50 		sync_cause = REG_READ(ah, AR_INTR_SYNC_CAUSE) &
51 			AR_INTR_SYNC_DEFAULT;
52 
53 		*masked = 0;
54 
55 		if (!isr && !sync_cause)
56 			return false;
57 	} else {
58 		*masked = 0;
59 		isr = REG_READ(ah, AR_ISR);
60 	}
61 
62 	if (isr) {
63 		if (isr & AR_ISR_BCNMISC) {
64 			u32 isr2;
65 			isr2 = REG_READ(ah, AR_ISR_S2);
66 			if (isr2 & AR_ISR_S2_TIM)
67 				mask2 |= ATH9K_INT_TIM;
68 			if (isr2 & AR_ISR_S2_DTIM)
69 				mask2 |= ATH9K_INT_DTIM;
70 			if (isr2 & AR_ISR_S2_DTIMSYNC)
71 				mask2 |= ATH9K_INT_DTIMSYNC;
72 			if (isr2 & (AR_ISR_S2_CABEND))
73 				mask2 |= ATH9K_INT_CABEND;
74 			if (isr2 & AR_ISR_S2_GTT)
75 				mask2 |= ATH9K_INT_GTT;
76 			if (isr2 & AR_ISR_S2_CST)
77 				mask2 |= ATH9K_INT_CST;
78 			if (isr2 & AR_ISR_S2_TSFOOR)
79 				mask2 |= ATH9K_INT_TSFOOR;
80 
81 			if (!(pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)) {
82 				REG_WRITE(ah, AR_ISR_S2, isr2);
83 				isr &= ~AR_ISR_BCNMISC;
84 			}
85 		}
86 
87 		if (pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)
88 			isr = REG_READ(ah, AR_ISR_RAC);
89 
90 		if (isr == 0xffffffff) {
91 			*masked = 0;
92 			return false;
93 		}
94 
95 		*masked = isr & ATH9K_INT_COMMON;
96 
97 		if (isr & (AR_ISR_RXMINTR | AR_ISR_RXINTM |
98 			   AR_ISR_RXOK | AR_ISR_RXERR))
99 			*masked |= ATH9K_INT_RX;
100 
101 		if (isr &
102 		    (AR_ISR_TXOK | AR_ISR_TXDESC | AR_ISR_TXERR |
103 		     AR_ISR_TXEOL)) {
104 			u32 s0_s, s1_s;
105 
106 			*masked |= ATH9K_INT_TX;
107 
108 			if (pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED) {
109 				s0_s = REG_READ(ah, AR_ISR_S0_S);
110 				s1_s = REG_READ(ah, AR_ISR_S1_S);
111 			} else {
112 				s0_s = REG_READ(ah, AR_ISR_S0);
113 				REG_WRITE(ah, AR_ISR_S0, s0_s);
114 				s1_s = REG_READ(ah, AR_ISR_S1);
115 				REG_WRITE(ah, AR_ISR_S1, s1_s);
116 
117 				isr &= ~(AR_ISR_TXOK |
118 					 AR_ISR_TXDESC |
119 					 AR_ISR_TXERR |
120 					 AR_ISR_TXEOL);
121 			}
122 
123 			ah->intr_txqs |= MS(s0_s, AR_ISR_S0_QCU_TXOK);
124 			ah->intr_txqs |= MS(s0_s, AR_ISR_S0_QCU_TXDESC);
125 			ah->intr_txqs |= MS(s1_s, AR_ISR_S1_QCU_TXERR);
126 			ah->intr_txqs |= MS(s1_s, AR_ISR_S1_QCU_TXEOL);
127 		}
128 
129 		if (isr & AR_ISR_RXORN) {
130 			ath_dbg(common, INTERRUPT,
131 				"receive FIFO overrun interrupt\n");
132 		}
133 
134 		*masked |= mask2;
135 	}
136 
137 	if (!AR_SREV_9100(ah) && (isr & AR_ISR_GENTMR)) {
138 		u32 s5_s;
139 
140 		if (pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED) {
141 			s5_s = REG_READ(ah, AR_ISR_S5_S);
142 		} else {
143 			s5_s = REG_READ(ah, AR_ISR_S5);
144 		}
145 
146 		ah->intr_gen_timer_trigger =
147 				MS(s5_s, AR_ISR_S5_GENTIMER_TRIG);
148 
149 		ah->intr_gen_timer_thresh =
150 			MS(s5_s, AR_ISR_S5_GENTIMER_THRESH);
151 
152 		if (ah->intr_gen_timer_trigger)
153 			*masked |= ATH9K_INT_GENTIMER;
154 
155 		if ((s5_s & AR_ISR_S5_TIM_TIMER) &&
156 		    !(pCap->hw_caps & ATH9K_HW_CAP_AUTOSLEEP))
157 			*masked |= ATH9K_INT_TIM_TIMER;
158 
159 		if (!(pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)) {
160 			REG_WRITE(ah, AR_ISR_S5, s5_s);
161 			isr &= ~AR_ISR_GENTMR;
162 		}
163 	}
164 
165 	if (!(pCap->hw_caps & ATH9K_HW_CAP_RAC_SUPPORTED)) {
166 		REG_WRITE(ah, AR_ISR, isr);
167 		REG_READ(ah, AR_ISR);
168 	}
169 
170 	if (AR_SREV_9100(ah))
171 		return true;
172 
173 	if (sync_cause) {
174 		if (sync_cause_p)
175 			*sync_cause_p = sync_cause;
176 		fatal_int =
177 			(sync_cause &
178 			 (AR_INTR_SYNC_HOST1_FATAL | AR_INTR_SYNC_HOST1_PERR))
179 			? true : false;
180 
181 		if (fatal_int) {
182 			if (sync_cause & AR_INTR_SYNC_HOST1_FATAL) {
183 				ath_dbg(common, ANY,
184 					"received PCI FATAL interrupt\n");
185 			}
186 			if (sync_cause & AR_INTR_SYNC_HOST1_PERR) {
187 				ath_dbg(common, ANY,
188 					"received PCI PERR interrupt\n");
189 			}
190 			*masked |= ATH9K_INT_FATAL;
191 		}
192 		if (sync_cause & AR_INTR_SYNC_RADM_CPL_TIMEOUT) {
193 			ath_dbg(common, INTERRUPT,
194 				"AR_INTR_SYNC_RADM_CPL_TIMEOUT\n");
195 			REG_WRITE(ah, AR_RC, AR_RC_HOSTIF);
196 			REG_WRITE(ah, AR_RC, 0);
197 			*masked |= ATH9K_INT_FATAL;
198 		}
199 		if (sync_cause & AR_INTR_SYNC_LOCAL_TIMEOUT) {
200 			ath_dbg(common, INTERRUPT,
201 				"AR_INTR_SYNC_LOCAL_TIMEOUT\n");
202 		}
203 
204 		REG_WRITE(ah, AR_INTR_SYNC_CAUSE_CLR, sync_cause);
205 		(void) REG_READ(ah, AR_INTR_SYNC_CAUSE_CLR);
206 	}
207 
208 	return true;
209 }
210 
211 static void
212 ar9002_set_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_info *i)
213 {
214 	struct ar5416_desc *ads = AR5416DESC(ds);
215 	u32 ctl1, ctl6;
216 
217 	ads->ds_txstatus0 = ads->ds_txstatus1 = 0;
218 	ads->ds_txstatus2 = ads->ds_txstatus3 = 0;
219 	ads->ds_txstatus4 = ads->ds_txstatus5 = 0;
220 	ads->ds_txstatus6 = ads->ds_txstatus7 = 0;
221 	ads->ds_txstatus8 = ads->ds_txstatus9 = 0;
222 
223 	WRITE_ONCE(ads->ds_link, i->link);
224 	WRITE_ONCE(ads->ds_data, i->buf_addr[0]);
225 
226 	ctl1 = i->buf_len[0] | (i->is_last ? 0 : AR_TxMore);
227 	ctl6 = SM(i->keytype, AR_EncrType);
228 
229 	if (AR_SREV_9285(ah)) {
230 		ads->ds_ctl8 = 0;
231 		ads->ds_ctl9 = 0;
232 		ads->ds_ctl10 = 0;
233 		ads->ds_ctl11 = 0;
234 	}
235 
236 	if ((i->is_first || i->is_last) &&
237 	    i->aggr != AGGR_BUF_MIDDLE && i->aggr != AGGR_BUF_LAST) {
238 		WRITE_ONCE(ads->ds_ctl2, set11nTries(i->rates, 0)
239 			| set11nTries(i->rates, 1)
240 			| set11nTries(i->rates, 2)
241 			| set11nTries(i->rates, 3)
242 			| (i->dur_update ? AR_DurUpdateEna : 0)
243 			| SM(0, AR_BurstDur));
244 
245 		WRITE_ONCE(ads->ds_ctl3, set11nRate(i->rates, 0)
246 			| set11nRate(i->rates, 1)
247 			| set11nRate(i->rates, 2)
248 			| set11nRate(i->rates, 3));
249 	} else {
250 		WRITE_ONCE(ads->ds_ctl2, 0);
251 		WRITE_ONCE(ads->ds_ctl3, 0);
252 	}
253 
254 	if (!i->is_first) {
255 		WRITE_ONCE(ads->ds_ctl0, 0);
256 		WRITE_ONCE(ads->ds_ctl1, ctl1);
257 		WRITE_ONCE(ads->ds_ctl6, ctl6);
258 		return;
259 	}
260 
261 	ctl1 |= (i->keyix != ATH9K_TXKEYIX_INVALID ? SM(i->keyix, AR_DestIdx) : 0)
262 		| SM(i->type, AR_FrameType)
263 		| (i->flags & ATH9K_TXDESC_NOACK ? AR_NoAck : 0)
264 		| (i->flags & ATH9K_TXDESC_EXT_ONLY ? AR_ExtOnly : 0)
265 		| (i->flags & ATH9K_TXDESC_EXT_AND_CTL ? AR_ExtAndCtl : 0);
266 
267 	switch (i->aggr) {
268 	case AGGR_BUF_FIRST:
269 		ctl6 |= SM(i->aggr_len, AR_AggrLen);
270 		/* fall through */
271 	case AGGR_BUF_MIDDLE:
272 		ctl1 |= AR_IsAggr | AR_MoreAggr;
273 		ctl6 |= SM(i->ndelim, AR_PadDelim);
274 		break;
275 	case AGGR_BUF_LAST:
276 		ctl1 |= AR_IsAggr;
277 		break;
278 	case AGGR_BUF_NONE:
279 		break;
280 	}
281 
282 	WRITE_ONCE(ads->ds_ctl0, (i->pkt_len & AR_FrameLen)
283 		| (i->flags & ATH9K_TXDESC_VMF ? AR_VirtMoreFrag : 0)
284 		| SM(i->txpower[0], AR_XmitPower0)
285 		| (i->flags & ATH9K_TXDESC_VEOL ? AR_VEOL : 0)
286 		| (i->flags & ATH9K_TXDESC_INTREQ ? AR_TxIntrReq : 0)
287 		| (i->keyix != ATH9K_TXKEYIX_INVALID ? AR_DestIdxValid : 0)
288 		| (i->flags & ATH9K_TXDESC_CLRDMASK ? AR_ClrDestMask : 0)
289 		| (i->flags & ATH9K_TXDESC_RTSENA ? AR_RTSEnable :
290 		   (i->flags & ATH9K_TXDESC_CTSENA ? AR_CTSEnable : 0)));
291 
292 	WRITE_ONCE(ads->ds_ctl1, ctl1);
293 	WRITE_ONCE(ads->ds_ctl6, ctl6);
294 
295 	if (i->aggr == AGGR_BUF_MIDDLE || i->aggr == AGGR_BUF_LAST)
296 		return;
297 
298 	WRITE_ONCE(ads->ds_ctl4, set11nPktDurRTSCTS(i->rates, 0)
299 		| set11nPktDurRTSCTS(i->rates, 1));
300 
301 	WRITE_ONCE(ads->ds_ctl5, set11nPktDurRTSCTS(i->rates, 2)
302 		| set11nPktDurRTSCTS(i->rates, 3));
303 
304 	WRITE_ONCE(ads->ds_ctl7, set11nRateFlags(i->rates, 0)
305 		| set11nRateFlags(i->rates, 1)
306 		| set11nRateFlags(i->rates, 2)
307 		| set11nRateFlags(i->rates, 3)
308 		| SM(i->rtscts_rate, AR_RTSCTSRate));
309 
310 	WRITE_ONCE(ads->ds_ctl9, SM(i->txpower[1], AR_XmitPower1));
311 	WRITE_ONCE(ads->ds_ctl10, SM(i->txpower[2], AR_XmitPower2));
312 	WRITE_ONCE(ads->ds_ctl11, SM(i->txpower[3], AR_XmitPower3));
313 }
314 
315 static int ar9002_hw_proc_txdesc(struct ath_hw *ah, void *ds,
316 				 struct ath_tx_status *ts)
317 {
318 	struct ar5416_desc *ads = AR5416DESC(ds);
319 	u32 status;
320 
321 	status = READ_ONCE(ads->ds_txstatus9);
322 	if ((status & AR_TxDone) == 0)
323 		return -EINPROGRESS;
324 
325 	ts->ts_tstamp = ads->AR_SendTimestamp;
326 	ts->ts_status = 0;
327 	ts->ts_flags = 0;
328 
329 	if (status & AR_TxOpExceeded)
330 		ts->ts_status |= ATH9K_TXERR_XTXOP;
331 	ts->tid = MS(status, AR_TxTid);
332 	ts->ts_rateindex = MS(status, AR_FinalTxIdx);
333 	ts->ts_seqnum = MS(status, AR_SeqNum);
334 
335 	status = READ_ONCE(ads->ds_txstatus0);
336 	ts->ts_rssi_ctl0 = MS(status, AR_TxRSSIAnt00);
337 	ts->ts_rssi_ctl1 = MS(status, AR_TxRSSIAnt01);
338 	ts->ts_rssi_ctl2 = MS(status, AR_TxRSSIAnt02);
339 	if (status & AR_TxBaStatus) {
340 		ts->ts_flags |= ATH9K_TX_BA;
341 		ts->ba_low = ads->AR_BaBitmapLow;
342 		ts->ba_high = ads->AR_BaBitmapHigh;
343 	}
344 
345 	status = READ_ONCE(ads->ds_txstatus1);
346 	if (status & AR_FrmXmitOK)
347 		ts->ts_status |= ATH9K_TX_ACKED;
348 	else {
349 		if (status & AR_ExcessiveRetries)
350 			ts->ts_status |= ATH9K_TXERR_XRETRY;
351 		if (status & AR_Filtered)
352 			ts->ts_status |= ATH9K_TXERR_FILT;
353 		if (status & AR_FIFOUnderrun) {
354 			ts->ts_status |= ATH9K_TXERR_FIFO;
355 			ath9k_hw_updatetxtriglevel(ah, true);
356 		}
357 	}
358 	if (status & AR_TxTimerExpired)
359 		ts->ts_status |= ATH9K_TXERR_TIMER_EXPIRED;
360 	if (status & AR_DescCfgErr)
361 		ts->ts_flags |= ATH9K_TX_DESC_CFG_ERR;
362 	if (status & AR_TxDataUnderrun) {
363 		ts->ts_flags |= ATH9K_TX_DATA_UNDERRUN;
364 		ath9k_hw_updatetxtriglevel(ah, true);
365 	}
366 	if (status & AR_TxDelimUnderrun) {
367 		ts->ts_flags |= ATH9K_TX_DELIM_UNDERRUN;
368 		ath9k_hw_updatetxtriglevel(ah, true);
369 	}
370 	ts->ts_shortretry = MS(status, AR_RTSFailCnt);
371 	ts->ts_longretry = MS(status, AR_DataFailCnt);
372 	ts->ts_virtcol = MS(status, AR_VirtRetryCnt);
373 
374 	status = READ_ONCE(ads->ds_txstatus5);
375 	ts->ts_rssi = MS(status, AR_TxRSSICombined);
376 	ts->ts_rssi_ext0 = MS(status, AR_TxRSSIAnt10);
377 	ts->ts_rssi_ext1 = MS(status, AR_TxRSSIAnt11);
378 	ts->ts_rssi_ext2 = MS(status, AR_TxRSSIAnt12);
379 
380 	ts->evm0 = ads->AR_TxEVM0;
381 	ts->evm1 = ads->AR_TxEVM1;
382 	ts->evm2 = ads->AR_TxEVM2;
383 
384 	return 0;
385 }
386 
387 static int ar9002_hw_get_duration(struct ath_hw *ah, const void *ds, int index)
388 {
389 	struct ar5416_desc *ads = AR5416DESC(ds);
390 
391 	switch (index) {
392 	case 0:
393 		return MS(READ_ONCE(ads->ds_ctl4), AR_PacketDur0);
394 	case 1:
395 		return MS(READ_ONCE(ads->ds_ctl4), AR_PacketDur1);
396 	case 2:
397 		return MS(READ_ONCE(ads->ds_ctl5), AR_PacketDur2);
398 	case 3:
399 		return MS(READ_ONCE(ads->ds_ctl5), AR_PacketDur3);
400 	default:
401 		return -1;
402 	}
403 }
404 
405 void ath9k_hw_setuprxdesc(struct ath_hw *ah, struct ath_desc *ds,
406 			  u32 size, u32 flags)
407 {
408 	struct ar5416_desc *ads = AR5416DESC(ds);
409 
410 	ads->ds_ctl1 = size & AR_BufLen;
411 	if (flags & ATH9K_RXDESC_INTREQ)
412 		ads->ds_ctl1 |= AR_RxIntrReq;
413 
414 	memset(&ads->u.rx, 0, sizeof(ads->u.rx));
415 }
416 EXPORT_SYMBOL(ath9k_hw_setuprxdesc);
417 
418 void ar9002_hw_attach_mac_ops(struct ath_hw *ah)
419 {
420 	struct ath_hw_ops *ops = ath9k_hw_ops(ah);
421 
422 	ops->rx_enable = ar9002_hw_rx_enable;
423 	ops->set_desc_link = ar9002_hw_set_desc_link;
424 	ops->get_isr = ar9002_hw_get_isr;
425 	ops->set_txdesc = ar9002_set_txdesc;
426 	ops->proc_txdesc = ar9002_hw_proc_txdesc;
427 	ops->get_duration = ar9002_hw_get_duration;
428 }
429