aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/ath/ath9k/ar9003_wow.c
blob: 81c88dd606dcd960f43e740b9af8cffcdc25778a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/*
 * Copyright (c) 2012 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/export.h>
#include "ath9k.h"
#include "reg.h"
#include "hw-ops.h"

const char *ath9k_hw_wow_event_to_string(u32 wow_event)
{
	if (wow_event & AH_WOW_MAGIC_PATTERN_EN)
		return "Magic pattern";
	if (wow_event & AH_WOW_USER_PATTERN_EN)
		return "User pattern";
	if (wow_event & AH_WOW_LINK_CHANGE)
		return "Link change";
	if (wow_event & AH_WOW_BEACON_MISS)
		return "Beacon miss";

	return  "unknown reason";
}
EXPORT_SYMBOL(ath9k_hw_wow_event_to_string);

static void ath9k_hw_set_powermode_wow_sleep(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);

	REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV);

	/* set rx disable bit */
	REG_WRITE(ah, AR_CR, AR_CR_RXD);

	if (!ath9k_hw_wait(ah, AR_CR, AR_CR_RXE, 0, AH_WAIT_TIMEOUT)) {
		ath_err(common, "Failed to stop Rx DMA in 10ms AR_CR=0x%08x AR_DIAG_SW=0x%08x\n",
			REG_READ(ah, AR_CR), REG_READ(ah, AR_DIAG_SW));
		return;
	}

	REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_ON_INT);
}

static void ath9k_wow_create_keep_alive_pattern(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);
	u8 sta_mac_addr[ETH_ALEN], ap_mac_addr[ETH_ALEN];
	u32 ctl[13] = {0};
	u32 data_word[KAL_NUM_DATA_WORDS];
	u8 i;
	u32 wow_ka_data_word0;

	memcpy(sta_mac_addr, common->macaddr, ETH_ALEN);
	memcpy(ap_mac_addr, common->curbssid, ETH_ALEN);

	/* set the transmit buffer */
	ctl[0] = (KAL_FRAME_LEN | (MAX_RATE_POWER << 16));
	ctl[1] = 0;
	ctl[3] = 0xb;	/* OFDM_6M hardware value for this rate */
	ctl[4] = 0;
	ctl[7] = (ah->txchainmask) << 2;
	ctl[2] = 0xf << 16; /* tx_tries 0 */

	for (i = 0; i < KAL_NUM_DESC_WORDS; i++)
		REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + i * 4), ctl[i]);

	REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + i * 4), ctl[i]);

	data_word[0] = (KAL_FRAME_TYPE << 2) | (KAL_FRAME_SUB_TYPE << 4) |
		       (KAL_TO_DS << 8) | (KAL_DURATION_ID << 16);
	data_word[1] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) |
		       (ap_mac_addr[1] << 8) | (ap_mac_addr[0]);
	data_word[2] = (sta_mac_addr[1] << 24) | (sta_mac_addr[0] << 16) |
		       (ap_mac_addr[5] << 8) | (ap_mac_addr[4]);
	data_word[3] = (sta_mac_addr[5] << 24) | (sta_mac_addr[4] << 16) |
		       (sta_mac_addr[3] << 8) | (sta_mac_addr[2]);
	data_word[4] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) |
		       (ap_mac_addr[1] << 8) | (ap_mac_addr[0]);
	data_word[5] = (ap_mac_addr[5] << 8) | (ap_mac_addr[4]);

	if (AR_SREV_9462_20(ah)) {
		/* AR9462 2.0 has an extra descriptor word (time based
		 * discard) compared to other chips */
		REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + (12 * 4)), 0);
		wow_ka_data_word0 = AR_WOW_TXBUF(13);
	} else {
		wow_ka_data_word0 = AR_WOW_TXBUF(12);
	}

	for (i = 0; i < KAL_NUM_DATA_WORDS; i++)
		REG_WRITE(ah, (wow_ka_data_word0 + i*4), data_word[i]);

}

void ath9k_hw_wow_apply_pattern(struct ath_hw *ah, u8 *user_pattern,
				u8 *user_mask, int pattern_count,
				int pattern_len)
{
	int i;
	u32 pattern_val, mask_val;
	u32 set, clr;

	/* FIXME: should check count by querying the hardware capability */
	if (pattern_count >= MAX_NUM_PATTERN)
		return;

	REG_SET_BIT(ah, AR_WOW_PATTERN, BIT(pattern_count));

	/* set the registers for pattern */
	for (i = 0; i < MAX_PATTERN_SIZE; i += 4) {
		memcpy(&pattern_val, user_pattern, 4);
		REG_WRITE(ah, (AR_WOW_TB_PATTERN(pattern_count) + i),
			  pattern_val);
		user_pattern += 4;
	}

	/* set the registers for mask */
	for (i = 0; i < MAX_PATTERN_MASK_SIZE; i += 4) {
		memcpy(&mask_val, user_mask, 4);
		REG_WRITE(ah, (AR_WOW_TB_MASK(pattern_count) + i), mask_val);
		user_mask += 4;
	}

	/* set the pattern length to be matched
	 *
	 * AR_WOW_LENGTH1_REG1
	 * bit 31:24 pattern 0 length
	 * bit 23:16 pattern 1 length
	 * bit 15:8 pattern 2 length
	 * bit 7:0 pattern 3 length
	 *
	 * AR_WOW_LENGTH1_REG2
	 * bit 31:24 pattern 4 length
	 * bit 23:16 pattern 5 length
	 * bit 15:8 pattern 6 length
	 * bit 7:0 pattern 7 length
	 *
	 * the below logic writes out the new
	 * pattern length for the corresponding
	 * pattern_count, while masking out the
	 * other fields
	 */

	ah->wow_event_mask |= BIT(pattern_count + AR_WOW_PAT_FOUND_SHIFT);

	if (pattern_count < 4) {
		/* Pattern 0-3 uses AR_WOW_LENGTH1 register */
		set = (pattern_len & AR_WOW_LENGTH_MAX) <<
		       AR_WOW_LEN1_SHIFT(pattern_count);
		clr = AR_WOW_LENGTH1_MASK(pattern_count);
		REG_RMW(ah, AR_WOW_LENGTH1, set, clr);
	} else {
		/* Pattern 4-7 uses AR_WOW_LENGTH2 register */
		set = (pattern_len & AR_WOW_LENGTH_MAX) <<
		       AR_WOW_LEN2_SHIFT(pattern_count);
		clr = AR_WOW_LENGTH2_MASK(pattern_count);
		REG_RMW(ah, AR_WOW_LENGTH2, set, clr);
	}

}
EXPORT_SYMBOL(ath9k_hw_wow_apply_pattern);

u32 ath9k_hw_wow_wakeup(struct ath_hw *ah)
{
	u32 wow_status = 0;
	u32 val = 0, rval;

	/*
	 * read the WoW status register to know
	 * the wakeup reason
	 */
	rval = REG_READ(ah, AR_WOW_PATTERN);
	val = AR_WOW_STATUS(rval);

	/*
	 * mask only the WoW events that we have enabled. Sometimes
	 * we have spurious WoW events from the AR_WOW_PATTERN
	 * register. This mask will clean it up.
	 */

	val &= ah->wow_event_mask;

	if (val) {
		if (val & AR_WOW_MAGIC_PAT_FOUND)
			wow_status |= AH_WOW_MAGIC_PATTERN_EN;
		if (AR_WOW_PATTERN_FOUND(val))
			wow_status |= AH_WOW_USER_PATTERN_EN;
		if (val & AR_WOW_KEEP_ALIVE_FAIL)
			wow_status |= AH_WOW_LINK_CHANGE;
		if (val & AR_WOW_BEACON_FAIL)
			wow_status |= AH_WOW_BEACON_MISS;
	}

	/*
	 * set and clear WOW_PME_CLEAR registers for the chip to
	 * generate next wow signal.
	 * disable D3 before accessing other registers ?
	 */

	/* do we need to check the bit value 0x01000000 (7-10) ?? */
	REG_RMW(ah, AR_PCIE_PM_CTRL, AR_PMCTRL_WOW_PME_CLR,
		AR_PMCTRL_PWR_STATE_D1D3);

	/*
	 * clear all events
	 */
	REG_WRITE(ah, AR_WOW_PATTERN,
		  AR_WOW_CLEAR_EVENTS(REG_READ(ah, AR_WOW_PATTERN)));

	/*
	 * restore the beacon threshold to init value
	 */
	REG_WRITE(ah, AR_RSSI_THR, INIT_RSSI_THR);

	/*
	 * Restore the way the PCI-E reset, Power-On-Reset, external
	 * PCIE_POR_SHORT pins are tied to its original value.
	 * Previously just before WoW sleep, we untie the PCI-E
	 * reset to our Chip's Power On Reset so that any PCI-E
	 * reset from the bus will not reset our chip
	 */
	if (ah->is_pciexpress)
		ath9k_hw_configpcipowersave(ah, false);

	ah->wow_event_mask = 0;

	return wow_status;
}
EXPORT_SYMBOL(ath9k_hw_wow_wakeup);

void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable)
{
	u32 wow_event_mask;
	u32 set, clr;

	/*
	 * wow_event_mask is a mask to the AR_WOW_PATTERN register to
	 * indicate which WoW events we have enabled. The WoW events
	 * are from the 'pattern_enable' in this function and
	 * 'pattern_count' of ath9k_hw_wow_apply_pattern()
	 */
	wow_event_mask = ah->wow_event_mask;

	/*
	 * Untie Power-on-Reset from the PCI-E-Reset. When we are in
	 * WOW sleep, we do want the Reset from the PCI-E to disturb
	 * our hw state
	 */
	if (ah->is_pciexpress) {
		/*
		 * we need to untie the internal POR (power-on-reset)
		 * to the external PCI-E reset. We also need to tie
		 * the PCI-E Phy reset to the PCI-E reset.
		 */
		set = AR_WA_RESET_EN | AR_WA_POR_SHORT;
		clr = AR_WA_UNTIE_RESET_EN | AR_WA_D3_L1_DISABLE;
		REG_RMW(ah, AR_WA, set, clr);
	}

	/*
	 * set the power states appropriately and enable PME
	 */
	set = AR_PMCTRL_HOST_PME_EN | AR_PMCTRL_PWR_PM_CTRL_ENA |
	      AR_PMCTRL_AUX_PWR_DET | AR_PMCTRL_WOW_PME_CLR;

	/*
	 * set and clear WOW_PME_CLEAR registers for the chip
	 * to generate next wow signal.
	 */
	REG_SET_BIT(ah, AR_PCIE_PM_CTRL, set);
	clr = AR_PMCTRL_WOW_PME_CLR;
	REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, clr);

	/*
	 * Setup for:
	 *	- beacon misses
	 *	- magic pattern
	 *	- keep alive timeout
	 *	- pattern matching
	 */

	/*
	 * Program default values for pattern backoff, aifs/slot/KAL count,
	 * beacon miss timeout, KAL timeout, etc.
	 */
	set = AR_WOW_BACK_OFF_SHIFT(AR_WOW_PAT_BACKOFF);
	REG_SET_BIT(ah, AR_WOW_PATTERN, set);

	set = AR_WOW_AIFS_CNT(AR_WOW_CNT_AIFS_CNT) |
	      AR_WOW_SLOT_CNT(AR_WOW_CNT_SLOT_CNT) |
	      AR_WOW_KEEP_ALIVE_CNT(AR_WOW_CNT_KA_CNT);
	REG_SET_BIT(ah, AR_WOW_COUNT, set);

	if (pattern_enable & AH_WOW_BEACON_MISS)
		set = AR_WOW_BEACON_TIMO;
	/* We are not using beacon miss, program a large value */
	else
		set = AR_WOW_BEACON_TIMO_MAX;

	REG_WRITE(ah, AR_WOW_BCN_TIMO, set);

	/*
	 * Keep alive timo in ms except AR9280
	 */
	if (!pattern_enable)
		set = AR_WOW_KEEP_ALIVE_NEVER;
	else
		set = KAL_TIMEOUT * 32;

	REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, set);

	/*
	 * Keep alive delay in us. based on 'power on clock',
	 * therefore in usec
	 */
	set = KAL_DELAY * 1000;
	REG_WRITE(ah, AR_WOW_KEEP_ALIVE_DELAY, set);

	/*
	 * Create keep alive pattern to respond to beacons
	 */
	ath9k_wow_create_keep_alive_pattern(ah);

	/*
	 * Configure MAC WoW Registers
	 */
	set = 0;
	/* Send keep alive timeouts anyway */
	clr = AR_WOW_KEEP_ALIVE_AUTO_DIS;

	if (pattern_enable & AH_WOW_LINK_CHANGE)
		wow_event_mask |= AR_WOW_KEEP_ALIVE_FAIL;
	else
		set = AR_WOW_KEEP_ALIVE_FAIL_DIS;

	set = AR_WOW_KEEP_ALIVE_FAIL_DIS;
	REG_RMW(ah, AR_WOW_KEEP_ALIVE, set, clr);

	/*
	 * we are relying on a bmiss failure. ensure we have
	 * enough threshold to prevent false positives
	 */
	REG_RMW_FIELD(ah, AR_RSSI_THR, AR_RSSI_THR_BM_THR,
		      AR_WOW_BMISSTHRESHOLD);

	set = 0;
	clr = 0;

	if (pattern_enable & AH_WOW_BEACON_MISS) {
		set = AR_WOW_BEACON_FAIL_EN;
		wow_event_mask |= AR_WOW_BEACON_FAIL;
	} else {
		clr = AR_WOW_BEACON_FAIL_EN;
	}

	REG_RMW(ah, AR_WOW_BCN_EN, set, clr);

	set = 0;
	clr = 0;
	/*
	 * Enable the magic packet registers
	 */
	if (pattern_enable & AH_WOW_MAGIC_PATTERN_EN) {
		set = AR_WOW_MAGIC_EN;
		wow_event_mask |= AR_WOW_MAGIC_PAT_FOUND;
	} else {
		clr = AR_WOW_MAGIC_EN;
	}
	set |= AR_WOW_MAC_INTR_EN;
	REG_RMW(ah, AR_WOW_PATTERN, set, clr);

	REG_WRITE(ah, AR_WOW_PATTERN_MATCH_LT_256B,
		  AR_WOW_PATTERN_SUPPORTED);

	/*
	 * Set the power states appropriately and enable PME
	 */
	clr = 0;
	set = AR_PMCTRL_PWR_STATE_D1D3 | AR_PMCTRL_HOST_PME_EN |
	      AR_PMCTRL_PWR_PM_CTRL_ENA;

	clr = AR_PCIE_PM_CTRL_ENA;
	REG_RMW(ah, AR_PCIE_PM_CTRL, set, clr);

	/*
	 * this is needed to prevent the chip waking up
	 * the host within 3-4 seconds with certain
	 * platform/BIOS. The fix is to enable
	 * D1 & D3 to match original definition and
	 * also match the OTP value. Anyway this
	 * is more related to SW WOW.
	 */
	clr = AR_PMCTRL_PWR_STATE_D1D3;
	REG_CLR_BIT(ah, AR_PCIE_PM_CTRL, clr);

	set = AR_PMCTRL_PWR_STATE_D1D3_REAL;
	REG_SET_BIT(ah, AR_PCIE_PM_CTRL, set);

	REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PRESERVE_SEQNUM);

	/* to bring down WOW power low margin */
	set = BIT(13);
	REG_SET_BIT(ah, AR_PCIE_PHY_REG3, set);
	/* HW WoW */
	clr = BIT(5);
	REG_CLR_BIT(ah, AR_PCU_MISC_MODE3, clr);

	ath9k_hw_set_powermode_wow_sleep(ah);
	ah->wow_event_mask = wow_event_mask;
}
EXPORT_SYMBOL(ath9k_hw_wow_enable);