1 /*
2  * Atheros CARL9170 driver
3  *
4  * MAC programming
5  *
6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; see the file COPYING.  If not, see
20  * http://www.gnu.org/licenses/.
21  *
22  * This file incorporates work covered by the following copyright and
23  * permission notice:
24  *    Copyright (c) 2007-2008 Atheros Communications, Inc.
25  *
26  *    Permission to use, copy, modify, and/or distribute this software for any
27  *    purpose with or without fee is hereby granted, provided that the above
28  *    copyright notice and this permission notice appear in all copies.
29  *
30  *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
31  *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
32  *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
33  *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
34  *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
35  *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
36  *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
37  */
38 
39 #include <asm/unaligned.h>
40 
41 #include "carl9170.h"
42 #include "cmd.h"
43 
44 int carl9170_set_dyn_sifs_ack(struct ar9170 *ar)
45 {
46 	u32 val;
47 
48 	if (conf_is_ht40(&ar->hw->conf))
49 		val = 0x010a;
50 	else {
51 		if (ar->hw->conf.chandef.chan->band == NL80211_BAND_2GHZ)
52 			val = 0x105;
53 		else
54 			val = 0x104;
55 	}
56 
57 	return carl9170_write_reg(ar, AR9170_MAC_REG_DYNAMIC_SIFS_ACK, val);
58 }
59 
60 int carl9170_set_rts_cts_rate(struct ar9170 *ar)
61 {
62 	u32 rts_rate, cts_rate;
63 
64 	if (conf_is_ht(&ar->hw->conf)) {
65 		/* 12 mbit OFDM */
66 		rts_rate = 0x1da;
67 		cts_rate = 0x10a;
68 	} else {
69 		if (ar->hw->conf.chandef.chan->band == NL80211_BAND_2GHZ) {
70 			/* 11 mbit CCK */
71 			rts_rate = 033;
72 			cts_rate = 003;
73 		} else {
74 			/* 6 mbit OFDM */
75 			rts_rate = 0x1bb;
76 			cts_rate = 0x10b;
77 		}
78 	}
79 
80 	return carl9170_write_reg(ar, AR9170_MAC_REG_RTS_CTS_RATE,
81 				  rts_rate | (cts_rate) << 16);
82 }
83 
84 int carl9170_set_slot_time(struct ar9170 *ar)
85 {
86 	struct ieee80211_vif *vif;
87 	u32 slottime = 20;
88 
89 	rcu_read_lock();
90 	vif = carl9170_get_main_vif(ar);
91 	if (!vif) {
92 		rcu_read_unlock();
93 		return 0;
94 	}
95 
96 	if ((ar->hw->conf.chandef.chan->band == NL80211_BAND_5GHZ) ||
97 	    vif->bss_conf.use_short_slot)
98 		slottime = 9;
99 
100 	rcu_read_unlock();
101 
102 	return carl9170_write_reg(ar, AR9170_MAC_REG_SLOT_TIME,
103 				  slottime << 10);
104 }
105 
106 int carl9170_set_mac_rates(struct ar9170 *ar)
107 {
108 	struct ieee80211_vif *vif;
109 	u32 basic, mandatory;
110 
111 	rcu_read_lock();
112 	vif = carl9170_get_main_vif(ar);
113 
114 	if (!vif) {
115 		rcu_read_unlock();
116 		return 0;
117 	}
118 
119 	basic = (vif->bss_conf.basic_rates & 0xf);
120 	basic |= (vif->bss_conf.basic_rates & 0xff0) << 4;
121 	rcu_read_unlock();
122 
123 	if (ar->hw->conf.chandef.chan->band == NL80211_BAND_5GHZ)
124 		mandatory = 0xff00; /* OFDM 6/9/12/18/24/36/48/54 */
125 	else
126 		mandatory = 0xff0f; /* OFDM (6/9../54) + CCK (1/2/5.5/11) */
127 
128 	carl9170_regwrite_begin(ar);
129 	carl9170_regwrite(AR9170_MAC_REG_BASIC_RATE, basic);
130 	carl9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, mandatory);
131 	carl9170_regwrite_finish();
132 
133 	return carl9170_regwrite_result();
134 }
135 
136 int carl9170_set_qos(struct ar9170 *ar)
137 {
138 	carl9170_regwrite_begin(ar);
139 
140 	carl9170_regwrite(AR9170_MAC_REG_AC0_CW, ar->edcf[0].cw_min |
141 			  (ar->edcf[0].cw_max << 16));
142 	carl9170_regwrite(AR9170_MAC_REG_AC1_CW, ar->edcf[1].cw_min |
143 			  (ar->edcf[1].cw_max << 16));
144 	carl9170_regwrite(AR9170_MAC_REG_AC2_CW, ar->edcf[2].cw_min |
145 			  (ar->edcf[2].cw_max << 16));
146 	carl9170_regwrite(AR9170_MAC_REG_AC3_CW, ar->edcf[3].cw_min |
147 			  (ar->edcf[3].cw_max << 16));
148 	carl9170_regwrite(AR9170_MAC_REG_AC4_CW, ar->edcf[4].cw_min |
149 			  (ar->edcf[4].cw_max << 16));
150 
151 	carl9170_regwrite(AR9170_MAC_REG_AC2_AC1_AC0_AIFS,
152 			  ((ar->edcf[0].aifs * 9 + 10)) |
153 			  ((ar->edcf[1].aifs * 9 + 10) << 12) |
154 			  ((ar->edcf[2].aifs * 9 + 10) << 24));
155 	carl9170_regwrite(AR9170_MAC_REG_AC4_AC3_AC2_AIFS,
156 			  ((ar->edcf[2].aifs * 9 + 10) >> 8) |
157 			  ((ar->edcf[3].aifs * 9 + 10) << 4) |
158 			  ((ar->edcf[4].aifs * 9 + 10) << 16));
159 
160 	carl9170_regwrite(AR9170_MAC_REG_AC1_AC0_TXOP,
161 			  ar->edcf[0].txop | ar->edcf[1].txop << 16);
162 	carl9170_regwrite(AR9170_MAC_REG_AC3_AC2_TXOP,
163 			  ar->edcf[2].txop | ar->edcf[3].txop << 16 |
164 			  ar->edcf[4].txop << 24);
165 
166 	carl9170_regwrite_finish();
167 
168 	return carl9170_regwrite_result();
169 }
170 
171 int carl9170_init_mac(struct ar9170 *ar)
172 {
173 	carl9170_regwrite_begin(ar);
174 
175 	/* switch MAC to OTUS interface */
176 	carl9170_regwrite(0x1c3600, 0x3);
177 
178 	carl9170_regwrite(AR9170_MAC_REG_ACK_EXTENSION, 0x40);
179 
180 	carl9170_regwrite(AR9170_MAC_REG_RETRY_MAX, 0x0);
181 
182 	carl9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
183 			  AR9170_MAC_FTF_MONITOR);
184 
185 	/* enable MMIC */
186 	carl9170_regwrite(AR9170_MAC_REG_SNIFFER,
187 			AR9170_MAC_SNIFFER_DEFAULTS);
188 
189 	carl9170_regwrite(AR9170_MAC_REG_RX_THRESHOLD, 0xc1f80);
190 
191 	carl9170_regwrite(AR9170_MAC_REG_RX_PE_DELAY, 0x70);
192 	carl9170_regwrite(AR9170_MAC_REG_EIFS_AND_SIFS, 0xa144000);
193 	carl9170_regwrite(AR9170_MAC_REG_SLOT_TIME, 9 << 10);
194 
195 	/* CF-END & CF-ACK rate => 24M OFDM */
196 	carl9170_regwrite(AR9170_MAC_REG_TID_CFACK_CFEND_RATE, 0x59900000);
197 
198 	/* NAV protects ACK only (in TXOP) */
199 	carl9170_regwrite(AR9170_MAC_REG_TXOP_DURATION, 0x201);
200 
201 	/* Set Beacon PHY CTRL's TPC to 0x7, TA1=1 */
202 	/* OTUS set AM to 0x1 */
203 	carl9170_regwrite(AR9170_MAC_REG_BCN_HT1, 0x8000170);
204 
205 	carl9170_regwrite(AR9170_MAC_REG_BACKOFF_PROTECT, 0x105);
206 
207 	/* Aggregation MAX number and timeout */
208 	carl9170_regwrite(AR9170_MAC_REG_AMPDU_FACTOR, 0x8000a);
209 	carl9170_regwrite(AR9170_MAC_REG_AMPDU_DENSITY, 0x140a07);
210 
211 	carl9170_regwrite(AR9170_MAC_REG_FRAMETYPE_FILTER,
212 			  AR9170_MAC_FTF_DEFAULTS);
213 
214 	carl9170_regwrite(AR9170_MAC_REG_RX_CONTROL,
215 			  AR9170_MAC_RX_CTRL_DEAGG |
216 			  AR9170_MAC_RX_CTRL_SHORT_FILTER);
217 
218 	/* rate sets */
219 	carl9170_regwrite(AR9170_MAC_REG_BASIC_RATE, 0x150f);
220 	carl9170_regwrite(AR9170_MAC_REG_MANDATORY_RATE, 0x150f);
221 	carl9170_regwrite(AR9170_MAC_REG_RTS_CTS_RATE, 0x0030033);
222 
223 	/* MIMO response control */
224 	carl9170_regwrite(AR9170_MAC_REG_ACK_TPC, 0x4003c1e);
225 
226 	carl9170_regwrite(AR9170_MAC_REG_AMPDU_RX_THRESH, 0xffff);
227 
228 	/* set PHY register read timeout (??) */
229 	carl9170_regwrite(AR9170_MAC_REG_MISC_680, 0xf00008);
230 
231 	/* Disable Rx TimeOut, workaround for BB. */
232 	carl9170_regwrite(AR9170_MAC_REG_RX_TIMEOUT, 0x0);
233 
234 	/* Set WLAN DMA interrupt mode: generate int per packet */
235 	carl9170_regwrite(AR9170_MAC_REG_TXRX_MPI, 0x110011);
236 
237 	carl9170_regwrite(AR9170_MAC_REG_FCS_SELECT,
238 			AR9170_MAC_FCS_FIFO_PROT);
239 
240 	/* Disables the CF_END frame, undocumented register */
241 	carl9170_regwrite(AR9170_MAC_REG_TXOP_NOT_ENOUGH_IND,
242 			0x141e0f48);
243 
244 	/* reset group hash table */
245 	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, 0xffffffff);
246 	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, 0xffffffff);
247 
248 	/* disable PRETBTT interrupt */
249 	carl9170_regwrite(AR9170_MAC_REG_PRETBTT, 0x0);
250 	carl9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, 0x0);
251 
252 	carl9170_regwrite_finish();
253 
254 	return carl9170_regwrite_result();
255 }
256 
257 static int carl9170_set_mac_reg(struct ar9170 *ar,
258 				const u32 reg, const u8 *mac)
259 {
260 	static const u8 zero[ETH_ALEN] = { 0 };
261 
262 	if (!mac)
263 		mac = zero;
264 
265 	carl9170_regwrite_begin(ar);
266 
267 	carl9170_regwrite(reg, get_unaligned_le32(mac));
268 	carl9170_regwrite(reg + 4, get_unaligned_le16(mac + 4));
269 
270 	carl9170_regwrite_finish();
271 
272 	return carl9170_regwrite_result();
273 }
274 
275 int carl9170_mod_virtual_mac(struct ar9170 *ar, const unsigned int id,
276 			     const u8 *mac)
277 {
278 	if (WARN_ON(id >= ar->fw.vif_num))
279 		return -EINVAL;
280 
281 	return carl9170_set_mac_reg(ar,
282 		AR9170_MAC_REG_ACK_TABLE + (id - 1) * 8, mac);
283 }
284 
285 int carl9170_update_multicast(struct ar9170 *ar, const u64 mc_hash)
286 {
287 	int err;
288 
289 	carl9170_regwrite_begin(ar);
290 	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_H, mc_hash >> 32);
291 	carl9170_regwrite(AR9170_MAC_REG_GROUP_HASH_TBL_L, mc_hash);
292 	carl9170_regwrite_finish();
293 	err = carl9170_regwrite_result();
294 	if (err)
295 		return err;
296 
297 	ar->cur_mc_hash = mc_hash;
298 	return 0;
299 }
300 
301 int carl9170_set_operating_mode(struct ar9170 *ar)
302 {
303 	struct ieee80211_vif *vif;
304 	struct ath_common *common = &ar->common;
305 	u8 *mac_addr, *bssid;
306 	u32 cam_mode = AR9170_MAC_CAM_DEFAULTS;
307 	u32 enc_mode = AR9170_MAC_ENCRYPTION_DEFAULTS |
308 		AR9170_MAC_ENCRYPTION_MGMT_RX_SOFTWARE;
309 	u32 rx_ctrl = AR9170_MAC_RX_CTRL_DEAGG |
310 		      AR9170_MAC_RX_CTRL_SHORT_FILTER;
311 	u32 sniffer = AR9170_MAC_SNIFFER_DEFAULTS;
312 	int err = 0;
313 
314 	rcu_read_lock();
315 	vif = carl9170_get_main_vif(ar);
316 
317 	if (vif) {
318 		mac_addr = common->macaddr;
319 		bssid = common->curbssid;
320 
321 		switch (vif->type) {
322 		case NL80211_IFTYPE_ADHOC:
323 			cam_mode |= AR9170_MAC_CAM_IBSS;
324 			break;
325 		case NL80211_IFTYPE_MESH_POINT:
326 		case NL80211_IFTYPE_AP:
327 			cam_mode |= AR9170_MAC_CAM_AP;
328 
329 			/* iwlagn 802.11n STA Workaround */
330 			rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
331 			break;
332 		case NL80211_IFTYPE_WDS:
333 			cam_mode |= AR9170_MAC_CAM_AP_WDS;
334 			rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
335 			break;
336 		case NL80211_IFTYPE_STATION:
337 			cam_mode |= AR9170_MAC_CAM_STA;
338 			rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
339 			break;
340 		default:
341 			WARN(1, "Unsupported operation mode %x\n", vif->type);
342 			err = -EOPNOTSUPP;
343 			break;
344 		}
345 	} else {
346 		/*
347 		 * Enable monitor mode
348 		 *
349 		 * rx_ctrl |= AR9170_MAC_RX_CTRL_ACK_IN_SNIFFER;
350 		 * sniffer |= AR9170_MAC_SNIFFER_ENABLE_PROMISC;
351 		 *
352 		 * When the hardware is in SNIFFER_PROMISC mode,
353 		 * it generates spurious ACKs for every incoming
354 		 * frame. This confuses every peer in the
355 		 * vicinity and the network throughput will suffer
356 		 * badly.
357 		 *
358 		 * Hence, the hardware will be put into station
359 		 * mode and just the rx filters are disabled.
360 		 */
361 		cam_mode |= AR9170_MAC_CAM_STA;
362 		rx_ctrl |= AR9170_MAC_RX_CTRL_PASS_TO_HOST;
363 		mac_addr = common->macaddr;
364 		bssid = NULL;
365 	}
366 	rcu_read_unlock();
367 
368 	if (err)
369 		return err;
370 
371 	if (ar->rx_software_decryption)
372 		enc_mode |= AR9170_MAC_ENCRYPTION_RX_SOFTWARE;
373 
374 	if (ar->sniffer_enabled) {
375 		enc_mode |= AR9170_MAC_ENCRYPTION_RX_SOFTWARE;
376 	}
377 
378 	err = carl9170_set_mac_reg(ar, AR9170_MAC_REG_MAC_ADDR_L, mac_addr);
379 	if (err)
380 		return err;
381 
382 	err = carl9170_set_mac_reg(ar, AR9170_MAC_REG_BSSID_L, bssid);
383 	if (err)
384 		return err;
385 
386 	carl9170_regwrite_begin(ar);
387 	carl9170_regwrite(AR9170_MAC_REG_SNIFFER, sniffer);
388 	carl9170_regwrite(AR9170_MAC_REG_CAM_MODE, cam_mode);
389 	carl9170_regwrite(AR9170_MAC_REG_ENCRYPTION, enc_mode);
390 	carl9170_regwrite(AR9170_MAC_REG_RX_CONTROL, rx_ctrl);
391 	carl9170_regwrite_finish();
392 
393 	return carl9170_regwrite_result();
394 }
395 
396 int carl9170_set_hwretry_limit(struct ar9170 *ar, const unsigned int max_retry)
397 {
398 	u32 tmp = min_t(u32, 0x33333, max_retry * 0x11111);
399 
400 	return carl9170_write_reg(ar, AR9170_MAC_REG_RETRY_MAX, tmp);
401 }
402 
403 int carl9170_set_beacon_timers(struct ar9170 *ar)
404 {
405 	struct ieee80211_vif *vif;
406 	u32 v = 0;
407 	u32 pretbtt = 0;
408 
409 	rcu_read_lock();
410 	vif = carl9170_get_main_vif(ar);
411 
412 	if (vif) {
413 		struct carl9170_vif_info *mvif;
414 		mvif = (void *) vif->drv_priv;
415 
416 		if (mvif->enable_beacon && !WARN_ON(!ar->beacon_enabled)) {
417 			ar->global_beacon_int = vif->bss_conf.beacon_int /
418 						ar->beacon_enabled;
419 
420 			SET_VAL(AR9170_MAC_BCN_DTIM, v,
421 				vif->bss_conf.dtim_period);
422 
423 			switch (vif->type) {
424 			case NL80211_IFTYPE_MESH_POINT:
425 			case NL80211_IFTYPE_ADHOC:
426 				v |= AR9170_MAC_BCN_IBSS_MODE;
427 				break;
428 			case NL80211_IFTYPE_AP:
429 				v |= AR9170_MAC_BCN_AP_MODE;
430 				break;
431 			default:
432 				WARN_ON_ONCE(1);
433 				break;
434 			}
435 		} else if (vif->type == NL80211_IFTYPE_STATION) {
436 			ar->global_beacon_int = vif->bss_conf.beacon_int;
437 
438 			SET_VAL(AR9170_MAC_BCN_DTIM, v,
439 				ar->hw->conf.ps_dtim_period);
440 
441 			v |= AR9170_MAC_BCN_STA_PS |
442 			     AR9170_MAC_BCN_PWR_MGT;
443 		}
444 
445 		if (ar->global_beacon_int) {
446 			if (ar->global_beacon_int < 15) {
447 				rcu_read_unlock();
448 				return -ERANGE;
449 			}
450 
451 			ar->global_pretbtt = ar->global_beacon_int -
452 					CARL9170_PRETBTT_KUS;
453 		} else {
454 			ar->global_pretbtt = 0;
455 		}
456 	} else {
457 		ar->global_beacon_int = 0;
458 		ar->global_pretbtt = 0;
459 	}
460 
461 	rcu_read_unlock();
462 
463 	SET_VAL(AR9170_MAC_BCN_PERIOD, v, ar->global_beacon_int);
464 	SET_VAL(AR9170_MAC_PRETBTT, pretbtt, ar->global_pretbtt);
465 	SET_VAL(AR9170_MAC_PRETBTT2, pretbtt, ar->global_pretbtt);
466 
467 	carl9170_regwrite_begin(ar);
468 	carl9170_regwrite(AR9170_MAC_REG_PRETBTT, pretbtt);
469 	carl9170_regwrite(AR9170_MAC_REG_BCN_PERIOD, v);
470 	carl9170_regwrite_finish();
471 	return carl9170_regwrite_result();
472 }
473 
474 int carl9170_upload_key(struct ar9170 *ar, const u8 id, const u8 *mac,
475 			const u8 ktype, const u8 keyidx, const u8 *keydata,
476 			const int keylen)
477 {
478 	struct carl9170_set_key_cmd key = { };
479 	static const u8 bcast[ETH_ALEN] = {
480 		0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
481 
482 	mac = mac ? : bcast;
483 
484 	key.user = cpu_to_le16(id);
485 	key.keyId = cpu_to_le16(keyidx);
486 	key.type = cpu_to_le16(ktype);
487 	memcpy(&key.macAddr, mac, ETH_ALEN);
488 	if (keydata)
489 		memcpy(&key.key, keydata, keylen);
490 
491 	return carl9170_exec_cmd(ar, CARL9170_CMD_EKEY,
492 		sizeof(key), (u8 *)&key, 0, NULL);
493 }
494 
495 int carl9170_disable_key(struct ar9170 *ar, const u8 id)
496 {
497 	struct carl9170_disable_key_cmd key = { };
498 
499 	key.user = cpu_to_le16(id);
500 
501 	return carl9170_exec_cmd(ar, CARL9170_CMD_DKEY,
502 		sizeof(key), (u8 *)&key, 0, NULL);
503 }
504 
505 int carl9170_set_mac_tpc(struct ar9170 *ar, struct ieee80211_channel *channel)
506 {
507 	unsigned int power, chains;
508 
509 	if (ar->eeprom.tx_mask != 1)
510 		chains = AR9170_TX_PHY_TXCHAIN_2;
511 	else
512 		chains = AR9170_TX_PHY_TXCHAIN_1;
513 
514 	switch (channel->band) {
515 	case NL80211_BAND_2GHZ:
516 		power = ar->power_2G_ofdm[0] & 0x3f;
517 		break;
518 	case NL80211_BAND_5GHZ:
519 		power = ar->power_5G_leg[0] & 0x3f;
520 		break;
521 	default:
522 		BUG_ON(1);
523 	}
524 
525 	power = min_t(unsigned int, power, ar->hw->conf.power_level * 2);
526 
527 	carl9170_regwrite_begin(ar);
528 	carl9170_regwrite(AR9170_MAC_REG_ACK_TPC,
529 			  0x3c1e | power << 20 | chains << 26);
530 	carl9170_regwrite(AR9170_MAC_REG_RTS_CTS_TPC,
531 			  power << 5 | chains << 11 |
532 			  power << 21 | chains << 27);
533 	carl9170_regwrite(AR9170_MAC_REG_CFEND_QOSNULL_TPC,
534 			  power << 5 | chains << 11 |
535 			  power << 21 | chains << 27);
536 	carl9170_regwrite_finish();
537 	return carl9170_regwrite_result();
538 }
539