1 | /* |
2 | * Copyright (c) 2012 Qualcomm Atheros, 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/export.h> |
18 | #include "ath9k.h" |
19 | #include "reg.h" |
20 | #include "reg_wow.h" |
21 | #include "hw-ops.h" |
22 | |
23 | static void ath9k_hw_set_sta_powersave(struct ath_hw *ah) |
24 | { |
25 | if (!ath9k_hw_mci_is_enabled(ah)) |
26 | goto set; |
27 | /* |
28 | * If MCI is being used, set PWR_SAV only when MCI's |
29 | * PS state is disabled. |
30 | */ |
31 | if (ar9003_mci_state(ah, state_type: MCI_STATE_GET_WLAN_PS_STATE) != MCI_PS_DISABLE) |
32 | return; |
33 | set: |
34 | REG_SET_BIT(ah, AR_STA_ID1, AR_STA_ID1_PWR_SAV); |
35 | } |
36 | |
37 | static void ath9k_hw_set_powermode_wow_sleep(struct ath_hw *ah) |
38 | { |
39 | struct ath_common *common = ath9k_hw_common(ah); |
40 | |
41 | ath9k_hw_set_sta_powersave(ah); |
42 | |
43 | /* set rx disable bit */ |
44 | REG_WRITE(ah, AR_CR, AR_CR_RXD); |
45 | |
46 | if (!ath9k_hw_wait(ah, AR_CR, AR_CR_RXE(ah), val: 0, AH_WAIT_TIMEOUT)) { |
47 | ath_err(common, "Failed to stop Rx DMA in 10ms AR_CR=0x%08x AR_DIAG_SW=0x%08x\n" , |
48 | REG_READ(ah, AR_CR), REG_READ(ah, AR_DIAG_SW)); |
49 | return; |
50 | } |
51 | |
52 | if (AR_SREV_9462(ah) || AR_SREV_9565(ah)) { |
53 | if (!REG_READ(ah, AR_MAC_PCU_GEN_TIMER_TSF_SEL)) |
54 | REG_CLR_BIT(ah, AR_DIRECT_CONNECT, AR_DC_TSF2_ENABLE); |
55 | } else if (AR_SREV_9485(ah)){ |
56 | if (!(REG_READ(ah, AR_NDP2_TIMER_MODE) & |
57 | AR_GEN_TIMERS2_MODE_ENABLE_MASK)) |
58 | REG_CLR_BIT(ah, AR_DIRECT_CONNECT, AR_DC_TSF2_ENABLE); |
59 | } |
60 | |
61 | if (ath9k_hw_mci_is_enabled(ah)) |
62 | REG_WRITE(ah, AR_RTC_KEEP_AWAKE, 0x2); |
63 | |
64 | REG_WRITE(ah, AR_RTC_FORCE_WAKE(ah), AR_RTC_FORCE_WAKE_ON_INT); |
65 | } |
66 | |
67 | static void ath9k_wow_create_keep_alive_pattern(struct ath_hw *ah) |
68 | { |
69 | struct ath_common *common = ath9k_hw_common(ah); |
70 | u8 sta_mac_addr[ETH_ALEN], ap_mac_addr[ETH_ALEN]; |
71 | u32 ctl[13] = {0}; |
72 | u32 data_word[KAL_NUM_DATA_WORDS]; |
73 | u8 i; |
74 | u32 wow_ka_data_word0; |
75 | |
76 | memcpy(sta_mac_addr, common->macaddr, ETH_ALEN); |
77 | memcpy(ap_mac_addr, common->curbssid, ETH_ALEN); |
78 | |
79 | /* set the transmit buffer */ |
80 | ctl[0] = (KAL_FRAME_LEN | (MAX_RATE_POWER << 16)); |
81 | ctl[1] = 0; |
82 | ctl[4] = 0; |
83 | ctl[7] = (ah->txchainmask) << 2; |
84 | ctl[2] = 0xf << 16; /* tx_tries 0 */ |
85 | |
86 | if (IS_CHAN_2GHZ(ah->curchan)) |
87 | ctl[3] = 0x1b; /* CCK_1M */ |
88 | else |
89 | ctl[3] = 0xb; /* OFDM_6M */ |
90 | |
91 | for (i = 0; i < KAL_NUM_DESC_WORDS; i++) |
92 | REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + i * 4), ctl[i]); |
93 | |
94 | data_word[0] = (KAL_FRAME_TYPE << 2) | (KAL_FRAME_SUB_TYPE << 4) | |
95 | (KAL_TO_DS << 8) | (KAL_DURATION_ID << 16); |
96 | data_word[1] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) | |
97 | (ap_mac_addr[1] << 8) | (ap_mac_addr[0]); |
98 | data_word[2] = (sta_mac_addr[1] << 24) | (sta_mac_addr[0] << 16) | |
99 | (ap_mac_addr[5] << 8) | (ap_mac_addr[4]); |
100 | data_word[3] = (sta_mac_addr[5] << 24) | (sta_mac_addr[4] << 16) | |
101 | (sta_mac_addr[3] << 8) | (sta_mac_addr[2]); |
102 | data_word[4] = (ap_mac_addr[3] << 24) | (ap_mac_addr[2] << 16) | |
103 | (ap_mac_addr[1] << 8) | (ap_mac_addr[0]); |
104 | data_word[5] = (ap_mac_addr[5] << 8) | (ap_mac_addr[4]); |
105 | |
106 | if (AR_SREV_9462_20_OR_LATER(ah) || AR_SREV_9565(ah)) { |
107 | /* |
108 | * AR9462 2.0 and AR9565 have an extra descriptor word |
109 | * (time based discard) compared to other chips. |
110 | */ |
111 | REG_WRITE(ah, (AR_WOW_KA_DESC_WORD2 + (12 * 4)), 0); |
112 | wow_ka_data_word0 = AR_WOW_TXBUF(13); |
113 | } else { |
114 | wow_ka_data_word0 = AR_WOW_TXBUF(12); |
115 | } |
116 | |
117 | for (i = 0; i < KAL_NUM_DATA_WORDS; i++) |
118 | REG_WRITE(ah, (wow_ka_data_word0 + i*4), data_word[i]); |
119 | } |
120 | |
121 | int ath9k_hw_wow_apply_pattern(struct ath_hw *ah, u8 *user_pattern, |
122 | u8 *user_mask, int pattern_count, |
123 | int pattern_len) |
124 | { |
125 | int i; |
126 | u32 pattern_val, mask_val; |
127 | u32 set, clr; |
128 | |
129 | if (pattern_count >= ah->wow.max_patterns) |
130 | return -ENOSPC; |
131 | |
132 | if (pattern_count < MAX_NUM_PATTERN_LEGACY) |
133 | REG_SET_BIT(ah, AR_WOW_PATTERN, BIT(pattern_count)); |
134 | else |
135 | REG_SET_BIT(ah, AR_MAC_PCU_WOW4, BIT(pattern_count - 8)); |
136 | |
137 | for (i = 0; i < MAX_PATTERN_SIZE; i += 4) { |
138 | memcpy(&pattern_val, user_pattern, 4); |
139 | REG_WRITE(ah, (AR_WOW_TB_PATTERN(pattern_count) + i), |
140 | pattern_val); |
141 | user_pattern += 4; |
142 | } |
143 | |
144 | for (i = 0; i < MAX_PATTERN_MASK_SIZE; i += 4) { |
145 | memcpy(&mask_val, user_mask, 4); |
146 | REG_WRITE(ah, (AR_WOW_TB_MASK(pattern_count) + i), mask_val); |
147 | user_mask += 4; |
148 | } |
149 | |
150 | if (pattern_count < MAX_NUM_PATTERN_LEGACY) |
151 | ah->wow.wow_event_mask |= |
152 | BIT(pattern_count + AR_WOW_PAT_FOUND_SHIFT); |
153 | else |
154 | ah->wow.wow_event_mask2 |= |
155 | BIT((pattern_count - 8) + AR_WOW_PAT_FOUND_SHIFT); |
156 | |
157 | if (pattern_count < 4) { |
158 | set = (pattern_len & AR_WOW_LENGTH_MAX) << |
159 | AR_WOW_LEN1_SHIFT(pattern_count); |
160 | clr = AR_WOW_LENGTH1_MASK(pattern_count); |
161 | REG_RMW(ah, AR_WOW_LENGTH1, set, clr); |
162 | } else if (pattern_count < 8) { |
163 | set = (pattern_len & AR_WOW_LENGTH_MAX) << |
164 | AR_WOW_LEN2_SHIFT(pattern_count); |
165 | clr = AR_WOW_LENGTH2_MASK(pattern_count); |
166 | REG_RMW(ah, AR_WOW_LENGTH2, set, clr); |
167 | } else if (pattern_count < 12) { |
168 | set = (pattern_len & AR_WOW_LENGTH_MAX) << |
169 | AR_WOW_LEN3_SHIFT(pattern_count); |
170 | clr = AR_WOW_LENGTH3_MASK(pattern_count); |
171 | REG_RMW(ah, AR_WOW_LENGTH3, set, clr); |
172 | } else if (pattern_count < MAX_NUM_PATTERN) { |
173 | set = (pattern_len & AR_WOW_LENGTH_MAX) << |
174 | AR_WOW_LEN4_SHIFT(pattern_count); |
175 | clr = AR_WOW_LENGTH4_MASK(pattern_count); |
176 | REG_RMW(ah, AR_WOW_LENGTH4, set, clr); |
177 | } |
178 | |
179 | return 0; |
180 | } |
181 | EXPORT_SYMBOL(ath9k_hw_wow_apply_pattern); |
182 | |
183 | u32 ath9k_hw_wow_wakeup(struct ath_hw *ah) |
184 | { |
185 | u32 wow_status = 0; |
186 | u32 val = 0, rval; |
187 | |
188 | /* |
189 | * Read the WoW status register to know |
190 | * the wakeup reason. |
191 | */ |
192 | rval = REG_READ(ah, AR_WOW_PATTERN); |
193 | val = AR_WOW_STATUS(rval); |
194 | |
195 | /* |
196 | * Mask only the WoW events that we have enabled. Sometimes |
197 | * we have spurious WoW events from the AR_WOW_PATTERN |
198 | * register. This mask will clean it up. |
199 | */ |
200 | val &= ah->wow.wow_event_mask; |
201 | |
202 | if (val) { |
203 | if (val & AR_WOW_MAGIC_PAT_FOUND) |
204 | wow_status |= AH_WOW_MAGIC_PATTERN_EN; |
205 | if (AR_WOW_PATTERN_FOUND(val)) |
206 | wow_status |= AH_WOW_USER_PATTERN_EN; |
207 | if (val & AR_WOW_KEEP_ALIVE_FAIL) |
208 | wow_status |= AH_WOW_LINK_CHANGE; |
209 | if (val & AR_WOW_BEACON_FAIL) |
210 | wow_status |= AH_WOW_BEACON_MISS; |
211 | } |
212 | |
213 | rval = REG_READ(ah, AR_MAC_PCU_WOW4); |
214 | val = AR_WOW_STATUS2(rval); |
215 | val &= ah->wow.wow_event_mask2; |
216 | |
217 | if (val) { |
218 | if (AR_WOW2_PATTERN_FOUND(val)) |
219 | wow_status |= AH_WOW_USER_PATTERN_EN; |
220 | } |
221 | |
222 | /* |
223 | * set and clear WOW_PME_CLEAR registers for the chip to |
224 | * generate next wow signal. |
225 | * disable D3 before accessing other registers ? |
226 | */ |
227 | |
228 | /* do we need to check the bit value 0x01000000 (7-10) ?? */ |
229 | REG_RMW(ah, AR_PCIE_PM_CTRL(ah), AR_PMCTRL_WOW_PME_CLR, |
230 | AR_PMCTRL_PWR_STATE_D1D3); |
231 | |
232 | /* |
233 | * Clear all events. |
234 | */ |
235 | REG_WRITE(ah, AR_WOW_PATTERN, |
236 | AR_WOW_CLEAR_EVENTS(REG_READ(ah, AR_WOW_PATTERN))); |
237 | REG_WRITE(ah, AR_MAC_PCU_WOW4, |
238 | AR_WOW_CLEAR_EVENTS2(REG_READ(ah, AR_MAC_PCU_WOW4))); |
239 | |
240 | /* |
241 | * restore the beacon threshold to init value |
242 | */ |
243 | REG_WRITE(ah, AR_RSSI_THR, INIT_RSSI_THR); |
244 | |
245 | /* |
246 | * Restore the way the PCI-E reset, Power-On-Reset, external |
247 | * PCIE_POR_SHORT pins are tied to its original value. |
248 | * Previously just before WoW sleep, we untie the PCI-E |
249 | * reset to our Chip's Power On Reset so that any PCI-E |
250 | * reset from the bus will not reset our chip |
251 | */ |
252 | if (ah->is_pciexpress) |
253 | ath9k_hw_configpcipowersave(ah, power_off: false); |
254 | |
255 | if (AR_SREV_9462(ah) || AR_SREV_9565(ah) || AR_SREV_9485(ah)) { |
256 | u32 dc = REG_READ(ah, AR_DIRECT_CONNECT); |
257 | |
258 | if (!(dc & AR_DC_TSF2_ENABLE)) |
259 | ath9k_hw_gen_timer_start_tsf2(ah); |
260 | } |
261 | |
262 | ah->wow.wow_event_mask = 0; |
263 | ah->wow.wow_event_mask2 = 0; |
264 | |
265 | return wow_status; |
266 | } |
267 | EXPORT_SYMBOL(ath9k_hw_wow_wakeup); |
268 | |
269 | static void ath9k_hw_wow_set_arwr_reg(struct ath_hw *ah) |
270 | { |
271 | u32 wa_reg; |
272 | |
273 | if (!ah->is_pciexpress) |
274 | return; |
275 | |
276 | /* |
277 | * We need to untie the internal POR (power-on-reset) |
278 | * to the external PCI-E reset. We also need to tie |
279 | * the PCI-E Phy reset to the PCI-E reset. |
280 | */ |
281 | wa_reg = REG_READ(ah, AR_WA(ah)); |
282 | wa_reg &= ~AR_WA_UNTIE_RESET_EN; |
283 | wa_reg |= AR_WA_RESET_EN; |
284 | wa_reg |= AR_WA_POR_SHORT; |
285 | |
286 | REG_WRITE(ah, AR_WA(ah), wa_reg); |
287 | } |
288 | |
289 | void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable) |
290 | { |
291 | u32 wow_event_mask; |
292 | u32 keep_alive, magic_pattern, host_pm_ctrl; |
293 | |
294 | wow_event_mask = ah->wow.wow_event_mask; |
295 | |
296 | /* |
297 | * AR_PMCTRL_HOST_PME_EN - Override PME enable in configuration |
298 | * space and allow MAC to generate WoW anyway. |
299 | * |
300 | * AR_PMCTRL_PWR_PM_CTRL_ENA - ??? |
301 | * |
302 | * AR_PMCTRL_AUX_PWR_DET - PCI core SYS_AUX_PWR_DET signal, |
303 | * needs to be set for WoW in PCI mode. |
304 | * |
305 | * AR_PMCTRL_WOW_PME_CLR - WoW Clear Signal going to the MAC. |
306 | * |
307 | * Set the power states appropriately and enable PME. |
308 | * |
309 | * Set and clear WOW_PME_CLEAR for the chip |
310 | * to generate next wow signal. |
311 | */ |
312 | REG_SET_BIT(ah, AR_PCIE_PM_CTRL(ah), AR_PMCTRL_HOST_PME_EN | |
313 | AR_PMCTRL_PWR_PM_CTRL_ENA | |
314 | AR_PMCTRL_AUX_PWR_DET | |
315 | AR_PMCTRL_WOW_PME_CLR); |
316 | REG_CLR_BIT(ah, AR_PCIE_PM_CTRL(ah), AR_PMCTRL_WOW_PME_CLR); |
317 | |
318 | /* |
319 | * Random Backoff. |
320 | * |
321 | * 31:28 in AR_WOW_PATTERN : Indicates the number of bits used in the |
322 | * contention window. For value N, |
323 | * the random backoff will be selected between |
324 | * 0 and (2 ^ N) - 1. |
325 | */ |
326 | REG_SET_BIT(ah, AR_WOW_PATTERN, |
327 | AR_WOW_BACK_OFF_SHIFT(AR_WOW_PAT_BACKOFF)); |
328 | |
329 | /* |
330 | * AIFS time, Slot time, Keep Alive count. |
331 | */ |
332 | REG_SET_BIT(ah, AR_WOW_COUNT, AR_WOW_AIFS_CNT(AR_WOW_CNT_AIFS_CNT) | |
333 | AR_WOW_SLOT_CNT(AR_WOW_CNT_SLOT_CNT) | |
334 | AR_WOW_KEEP_ALIVE_CNT(AR_WOW_CNT_KA_CNT)); |
335 | /* |
336 | * Beacon timeout. |
337 | */ |
338 | if (pattern_enable & AH_WOW_BEACON_MISS) |
339 | REG_WRITE(ah, AR_WOW_BCN_TIMO, AR_WOW_BEACON_TIMO); |
340 | else |
341 | REG_WRITE(ah, AR_WOW_BCN_TIMO, AR_WOW_BEACON_TIMO_MAX); |
342 | |
343 | /* |
344 | * Keep alive timeout in ms. |
345 | */ |
346 | if (!pattern_enable) |
347 | REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, AR_WOW_KEEP_ALIVE_NEVER); |
348 | else |
349 | REG_WRITE(ah, AR_WOW_KEEP_ALIVE_TIMO, KAL_TIMEOUT * 32); |
350 | |
351 | /* |
352 | * Keep alive delay in us. |
353 | */ |
354 | REG_WRITE(ah, AR_WOW_KEEP_ALIVE_DELAY, KAL_DELAY * 1000); |
355 | |
356 | /* |
357 | * Create keep alive pattern to respond to beacons. |
358 | */ |
359 | ath9k_wow_create_keep_alive_pattern(ah); |
360 | |
361 | /* |
362 | * Configure keep alive register. |
363 | */ |
364 | keep_alive = REG_READ(ah, AR_WOW_KEEP_ALIVE); |
365 | |
366 | /* Send keep alive timeouts anyway */ |
367 | keep_alive &= ~AR_WOW_KEEP_ALIVE_AUTO_DIS; |
368 | |
369 | if (pattern_enable & AH_WOW_LINK_CHANGE) { |
370 | keep_alive &= ~AR_WOW_KEEP_ALIVE_FAIL_DIS; |
371 | wow_event_mask |= AR_WOW_KEEP_ALIVE_FAIL; |
372 | } else { |
373 | keep_alive |= AR_WOW_KEEP_ALIVE_FAIL_DIS; |
374 | } |
375 | |
376 | REG_WRITE(ah, AR_WOW_KEEP_ALIVE, keep_alive); |
377 | |
378 | /* |
379 | * We are relying on a bmiss failure, ensure we have |
380 | * enough threshold to prevent false positives. |
381 | */ |
382 | REG_RMW_FIELD(ah, AR_RSSI_THR, AR_RSSI_THR_BM_THR, |
383 | AR_WOW_BMISSTHRESHOLD); |
384 | |
385 | if (pattern_enable & AH_WOW_BEACON_MISS) { |
386 | wow_event_mask |= AR_WOW_BEACON_FAIL; |
387 | REG_SET_BIT(ah, AR_WOW_BCN_EN, AR_WOW_BEACON_FAIL_EN); |
388 | } else { |
389 | REG_CLR_BIT(ah, AR_WOW_BCN_EN, AR_WOW_BEACON_FAIL_EN); |
390 | } |
391 | |
392 | /* |
393 | * Enable the magic packet registers. |
394 | */ |
395 | magic_pattern = REG_READ(ah, AR_WOW_PATTERN); |
396 | magic_pattern |= AR_WOW_MAC_INTR_EN; |
397 | |
398 | if (pattern_enable & AH_WOW_MAGIC_PATTERN_EN) { |
399 | magic_pattern |= AR_WOW_MAGIC_EN; |
400 | wow_event_mask |= AR_WOW_MAGIC_PAT_FOUND; |
401 | } else { |
402 | magic_pattern &= ~AR_WOW_MAGIC_EN; |
403 | } |
404 | |
405 | REG_WRITE(ah, AR_WOW_PATTERN, magic_pattern); |
406 | |
407 | /* |
408 | * Enable pattern matching for packets which are less |
409 | * than 256 bytes. |
410 | */ |
411 | REG_WRITE(ah, AR_WOW_PATTERN_MATCH_LT_256B, |
412 | AR_WOW_PATTERN_SUPPORTED); |
413 | |
414 | /* |
415 | * Set the power states appropriately and enable PME. |
416 | */ |
417 | host_pm_ctrl = REG_READ(ah, AR_PCIE_PM_CTRL(ah)); |
418 | host_pm_ctrl |= AR_PMCTRL_PWR_STATE_D1D3 | |
419 | AR_PMCTRL_HOST_PME_EN | |
420 | AR_PMCTRL_PWR_PM_CTRL_ENA; |
421 | host_pm_ctrl &= ~AR_PCIE_PM_CTRL_ENA; |
422 | |
423 | if (AR_SREV_9462(ah)) { |
424 | /* |
425 | * This is needed to prevent the chip waking up |
426 | * the host within 3-4 seconds with certain |
427 | * platform/BIOS. |
428 | */ |
429 | host_pm_ctrl &= ~AR_PMCTRL_PWR_STATE_D1D3; |
430 | host_pm_ctrl |= AR_PMCTRL_PWR_STATE_D1D3_REAL; |
431 | } |
432 | |
433 | REG_WRITE(ah, AR_PCIE_PM_CTRL(ah), host_pm_ctrl); |
434 | |
435 | /* |
436 | * Enable sequence number generation when asleep. |
437 | */ |
438 | REG_CLR_BIT(ah, AR_STA_ID1, AR_STA_ID1_PRESERVE_SEQNUM); |
439 | |
440 | /* To bring down WOW power low margin */ |
441 | REG_SET_BIT(ah, AR_PCIE_PHY_REG3, BIT(13)); |
442 | |
443 | ath9k_hw_wow_set_arwr_reg(ah); |
444 | |
445 | if (ath9k_hw_mci_is_enabled(ah)) |
446 | REG_WRITE(ah, AR_RTC_KEEP_AWAKE, 0x2); |
447 | |
448 | /* HW WoW */ |
449 | REG_CLR_BIT(ah, AR_PCU_MISC_MODE3, BIT(5)); |
450 | |
451 | ath9k_hw_set_powermode_wow_sleep(ah); |
452 | ah->wow.wow_event_mask = wow_event_mask; |
453 | } |
454 | EXPORT_SYMBOL(ath9k_hw_wow_enable); |
455 | |