1 /*
2 * Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
3 * Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 *
17 */
18
19 /********************************************\
20 Queue Control Unit, DCF Control Unit Functions
21 \********************************************/
22
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include "ath5k.h"
26 #include "reg.h"
27 #include "debug.h"
28 #include <linux/log2.h>
29
30 /**
31 * DOC: Queue Control Unit (QCU)/DCF Control Unit (DCU) functions
32 *
33 * Here we setup parameters for the 12 available TX queues. Note that
34 * on the various registers we can usually only map the first 10 of them so
35 * basically we have 10 queues to play with. Each queue has a matching
36 * QCU that controls when the queue will get triggered and multiple QCUs
37 * can be mapped to a single DCU that controls the various DFS parameters
38 * for the various queues. In our setup we have a 1:1 mapping between QCUs
39 * and DCUs allowing us to have different DFS settings for each queue.
40 *
41 * When a frame goes into a TX queue, QCU decides when it'll trigger a
42 * transmission based on various criteria (such as how many data we have inside
43 * it's buffer or -if it's a beacon queue- if it's time to fire up the queue
44 * based on TSF etc), DCU adds backoff, IFSes etc and then a scheduler
45 * (arbitrator) decides the priority of each QCU based on it's configuration
46 * (e.g. beacons are always transmitted when they leave DCU bypassing all other
47 * frames from other queues waiting to be transmitted). After a frame leaves
48 * the DCU it goes to PCU for further processing and then to PHY for
49 * the actual transmission.
50 */
51
52
53 /******************\
54 * Helper functions *
55 \******************/
56
57 /**
58 * ath5k_hw_num_tx_pending() - Get number of pending frames for a given queue
59 * @ah: The &struct ath5k_hw
60 * @queue: One of enum ath5k_tx_queue_id
61 */
62 u32
63 ath5k_hw_num_tx_pending(struct ath5k_hw *ah, unsigned int queue)
64 {
65 u32 pending;
66 AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
67
68 /* Return if queue is declared inactive */
69 if (ah->ah_txq[queue].tqi_type == AR5K_TX_QUEUE_INACTIVE)
70 return false;
71
72 /* XXX: How about AR5K_CFG_TXCNT ? */
73 if (ah->ah_version == AR5K_AR5210)
74 return false;
75
76 pending = ath5k_hw_reg_read(ah, AR5K_QUEUE_STATUS(queue));
77 pending &= AR5K_QCU_STS_FRMPENDCNT;
78
79 /* It's possible to have no frames pending even if TXE
80 * is set. To indicate that q has not stopped return
81 * true */
82 if (!pending && AR5K_REG_READ_Q(ah, AR5K_QCU_TXE, queue))
83 return true;
84
85 return pending;
86 }
87
88 /**
89 * ath5k_hw_release_tx_queue() - Set a transmit queue inactive
90 * @ah: The &struct ath5k_hw
91 * @queue: One of enum ath5k_tx_queue_id
92 */
93 void
94 ath5k_hw_release_tx_queue(struct ath5k_hw *ah, unsigned int queue)
95 {
96 if (WARN_ON(queue >= ah->ah_capabilities.cap_queues.q_tx_num))
97 return;
98
99 /* This queue will be skipped in further operations */
100 ah->ah_txq[queue].tqi_type = AR5K_TX_QUEUE_INACTIVE;
101 /*For SIMR setup*/
102 AR5K_Q_DISABLE_BITS(ah->ah_txq_status, queue);
103 }
104
105 /**
106 * ath5k_cw_validate() - Make sure the given cw is valid
107 * @cw_req: The contention window value to check
108 *
109 * Make sure cw is a power of 2 minus 1 and smaller than 1024
110 */
111 static u16
112 ath5k_cw_validate(u16 cw_req)
113 {
114 cw_req = min(cw_req, (u16)1023);
115
116 /* Check if cw_req + 1 a power of 2 */
117 if (is_power_of_2(cw_req + 1))
118 return cw_req;
119
120 /* Check if cw_req is a power of 2 */
121 if (is_power_of_2(cw_req))
122 return cw_req - 1;
123
124 /* If none of the above is correct
125 * find the closest power of 2 */
126 cw_req = (u16) roundup_pow_of_two(cw_req) - 1;
127
128 return cw_req;
129 }
130
131 /**
132 * ath5k_hw_get_tx_queueprops() - Get properties for a transmit queue
133 * @ah: The &struct ath5k_hw
134 * @queue: One of enum ath5k_tx_queue_id
135 * @queue_info: The &struct ath5k_txq_info to fill
136 */
137 int
138 ath5k_hw_get_tx_queueprops(struct ath5k_hw *ah, int queue,
139 struct ath5k_txq_info *queue_info)
140 {
141 memcpy(queue_info, &ah->ah_txq[queue], sizeof(struct ath5k_txq_info));
142 return 0;
143 }
144
145 /**
146 * ath5k_hw_set_tx_queueprops() - Set properties for a transmit queue
147 * @ah: The &struct ath5k_hw
148 * @queue: One of enum ath5k_tx_queue_id
149 * @qinfo: The &struct ath5k_txq_info to use
150 *
151 * Returns 0 on success or -EIO if queue is inactive
152 */
153 int
154 ath5k_hw_set_tx_queueprops(struct ath5k_hw *ah, int queue,
155 const struct ath5k_txq_info *qinfo)
156 {
157 struct ath5k_txq_info *qi;
158
159 AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
160
161 qi = &ah->ah_txq[queue];
162
163 if (qi->tqi_type == AR5K_TX_QUEUE_INACTIVE)
164 return -EIO;
165
166 /* copy and validate values */
167 qi->tqi_type = qinfo->tqi_type;
168 qi->tqi_subtype = qinfo->tqi_subtype;
169 qi->tqi_flags = qinfo->tqi_flags;
170 /*
171 * According to the docs: Although the AIFS field is 8 bit wide,
172 * the maximum supported value is 0xFC. Setting it higher than that
173 * will cause the DCU to hang.
174 */
175 qi->tqi_aifs = min(qinfo->tqi_aifs, (u8)0xFC);
176 qi->tqi_cw_min = ath5k_cw_validate(qinfo->tqi_cw_min);
177 qi->tqi_cw_max = ath5k_cw_validate(qinfo->tqi_cw_max);
178 qi->tqi_cbr_period = qinfo->tqi_cbr_period;
179 qi->tqi_cbr_overflow_limit = qinfo->tqi_cbr_overflow_limit;
180 qi->tqi_burst_time = qinfo->tqi_burst_time;
181 qi->tqi_ready_time = qinfo->tqi_ready_time;
182
183 /*XXX: Is this supported on 5210 ?*/
184 /*XXX: Is this correct for AR5K_WME_AC_VI,VO ???*/
185 if ((qinfo->tqi_type == AR5K_TX_QUEUE_DATA &&
186 ((qinfo->tqi_subtype == AR5K_WME_AC_VI) ||
187 (qinfo->tqi_subtype == AR5K_WME_AC_VO))) ||
188 qinfo->tqi_type == AR5K_TX_QUEUE_UAPSD)
189 qi->tqi_flags |= AR5K_TXQ_FLAG_POST_FR_BKOFF_DIS;
190
191 return 0;
192 }
193
194 /**
195 * ath5k_hw_setup_tx_queue() - Initialize a transmit queue
196 * @ah: The &struct ath5k_hw
197 * @queue_type: One of enum ath5k_tx_queue
198 * @queue_info: The &struct ath5k_txq_info to use
199 *
200 * Returns 0 on success, -EINVAL on invalid arguments
201 */
202 int
203 ath5k_hw_setup_tx_queue(struct ath5k_hw *ah, enum ath5k_tx_queue queue_type,
204 struct ath5k_txq_info *queue_info)
205 {
206 unsigned int queue;
207 int ret;
208
209 /*
210 * Get queue by type
211 */
212 /* 5210 only has 2 queues */
213 if (ah->ah_capabilities.cap_queues.q_tx_num == 2) {
214 switch (queue_type) {
215 case AR5K_TX_QUEUE_DATA:
216 queue = AR5K_TX_QUEUE_ID_NOQCU_DATA;
217 break;
218 case AR5K_TX_QUEUE_BEACON:
219 case AR5K_TX_QUEUE_CAB:
220 queue = AR5K_TX_QUEUE_ID_NOQCU_BEACON;
221 break;
222 default:
223 return -EINVAL;
224 }
225 } else {
226 switch (queue_type) {
227 case AR5K_TX_QUEUE_DATA:
228 queue = queue_info->tqi_subtype;
229 break;
230 case AR5K_TX_QUEUE_UAPSD:
231 queue = AR5K_TX_QUEUE_ID_UAPSD;
232 break;
233 case AR5K_TX_QUEUE_BEACON:
234 queue = AR5K_TX_QUEUE_ID_BEACON;
235 break;
236 case AR5K_TX_QUEUE_CAB:
237 queue = AR5K_TX_QUEUE_ID_CAB;
238 break;
239 default:
240 return -EINVAL;
241 }
242 }
243
244 /*
245 * Setup internal queue structure
246 */
247 memset(&ah->ah_txq[queue], 0, sizeof(struct ath5k_txq_info));
248 ah->ah_txq[queue].tqi_type = queue_type;
249
250 if (queue_info != NULL) {
251 queue_info->tqi_type = queue_type;
252 ret = ath5k_hw_set_tx_queueprops(ah, queue, queue_info);
253 if (ret)
254 return ret;
255 }
256
257 /*
258 * We use ah_txq_status to hold a temp value for
259 * the Secondary interrupt mask registers on 5211+
260 * check out ath5k_hw_reset_tx_queue
261 */
262 AR5K_Q_ENABLE_BITS(ah->ah_txq_status, queue);
263
264 return queue;
265 }
266
267
268 /*******************************\
269 * Single QCU/DCU initialization *
270 \*******************************/
271
272 /**
273 * ath5k_hw_set_tx_retry_limits() - Set tx retry limits on DCU
274 * @ah: The &struct ath5k_hw
275 * @queue: One of enum ath5k_tx_queue_id
276 *
277 * This function is used when initializing a queue, to set
278 * retry limits based on ah->ah_retry_* and the chipset used.
279 */
280 void
281 ath5k_hw_set_tx_retry_limits(struct ath5k_hw *ah,
282 unsigned int queue)
283 {
284 /* Single data queue on AR5210 */
285 if (ah->ah_version == AR5K_AR5210) {
286 struct ath5k_txq_info *tq = &ah->ah_txq[queue];
287
288 if (queue > 0)
289 return;
290
291 ath5k_hw_reg_write(ah,
292 (tq->tqi_cw_min << AR5K_NODCU_RETRY_LMT_CW_MIN_S)
293 | AR5K_REG_SM(ah->ah_retry_long,
294 AR5K_NODCU_RETRY_LMT_SLG_RETRY)
295 | AR5K_REG_SM(ah->ah_retry_short,
296 AR5K_NODCU_RETRY_LMT_SSH_RETRY)
297 | AR5K_REG_SM(ah->ah_retry_long,
298 AR5K_NODCU_RETRY_LMT_LG_RETRY)
299 | AR5K_REG_SM(ah->ah_retry_short,
300 AR5K_NODCU_RETRY_LMT_SH_RETRY),
301 AR5K_NODCU_RETRY_LMT);
302 /* DCU on AR5211+ */
303 } else {
304 ath5k_hw_reg_write(ah,
305 AR5K_REG_SM(ah->ah_retry_long,
306 AR5K_DCU_RETRY_LMT_RTS)
307 | AR5K_REG_SM(ah->ah_retry_long,
308 AR5K_DCU_RETRY_LMT_STA_RTS)
309 | AR5K_REG_SM(max(ah->ah_retry_long, ah->ah_retry_short),
310 AR5K_DCU_RETRY_LMT_STA_DATA),
311 AR5K_QUEUE_DFS_RETRY_LIMIT(queue));
312 }
313 }
314
315 /**
316 * ath5k_hw_reset_tx_queue() - Initialize a single hw queue
317 * @ah: The &struct ath5k_hw
318 * @queue: One of enum ath5k_tx_queue_id
319 *
320 * Set DCF properties for the given transmit queue on DCU
321 * and configures all queue-specific parameters.
322 */
323 int
324 ath5k_hw_reset_tx_queue(struct ath5k_hw *ah, unsigned int queue)
325 {
326 struct ath5k_txq_info *tq = &ah->ah_txq[queue];
327
328 AR5K_ASSERT_ENTRY(queue, ah->ah_capabilities.cap_queues.q_tx_num);
329
330 /* Skip if queue inactive or if we are on AR5210
331 * that doesn't have QCU/DCU */
332 if ((ah->ah_version == AR5K_AR5210) ||
333 (tq->tqi_type == AR5K_TX_QUEUE_INACTIVE))
334 return 0;
335
336 /*
337 * Set contention window (cw_min/cw_max)
338 * and arbitrated interframe space (aifs)...
339 */
340 ath5k_hw_reg_write(ah,
341 AR5K_REG_SM(tq->tqi_cw_min, AR5K_DCU_LCL_IFS_CW_MIN) |
342 AR5K_REG_SM(tq->tqi_cw_max, AR5K_DCU_LCL_IFS_CW_MAX) |
343 AR5K_REG_SM(tq->tqi_aifs, AR5K_DCU_LCL_IFS_AIFS),
344 AR5K_QUEUE_DFS_LOCAL_IFS(queue));
345
346 /*
347 * Set tx retry limits for this queue
348 */
349 ath5k_hw_set_tx_retry_limits(ah, queue);
350
351
352 /*
353 * Set misc registers
354 */
355
356 /* Enable DCU to wait for next fragment from QCU */
357 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
358 AR5K_DCU_MISC_FRAG_WAIT);
359
360 /* On Maui and Spirit use the global seqnum on DCU */
361 if (ah->ah_mac_version < AR5K_SREV_AR5211)
362 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
363 AR5K_DCU_MISC_SEQNUM_CTL);
364
365 /* Constant bit rate period */
366 if (tq->tqi_cbr_period) {
367 ath5k_hw_reg_write(ah, AR5K_REG_SM(tq->tqi_cbr_period,
368 AR5K_QCU_CBRCFG_INTVAL) |
369 AR5K_REG_SM(tq->tqi_cbr_overflow_limit,
370 AR5K_QCU_CBRCFG_ORN_THRES),
371 AR5K_QUEUE_CBRCFG(queue));
372
373 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
374 AR5K_QCU_MISC_FRSHED_CBR);
375
376 if (tq->tqi_cbr_overflow_limit)
377 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
378 AR5K_QCU_MISC_CBR_THRES_ENABLE);
379 }
380
381 /* Ready time interval */
382 if (tq->tqi_ready_time && (tq->tqi_type != AR5K_TX_QUEUE_CAB))
383 ath5k_hw_reg_write(ah, AR5K_REG_SM(tq->tqi_ready_time,
384 AR5K_QCU_RDYTIMECFG_INTVAL) |
385 AR5K_QCU_RDYTIMECFG_ENABLE,
386 AR5K_QUEUE_RDYTIMECFG(queue));
387
388 if (tq->tqi_burst_time) {
389 ath5k_hw_reg_write(ah, AR5K_REG_SM(tq->tqi_burst_time,
390 AR5K_DCU_CHAN_TIME_DUR) |
391 AR5K_DCU_CHAN_TIME_ENABLE,
392 AR5K_QUEUE_DFS_CHANNEL_TIME(queue));
393
394 if (tq->tqi_flags & AR5K_TXQ_FLAG_RDYTIME_EXP_POLICY_ENABLE)
395 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
396 AR5K_QCU_MISC_RDY_VEOL_POLICY);
397 }
398
399 /* Enable/disable Post frame backoff */
400 if (tq->tqi_flags & AR5K_TXQ_FLAG_BACKOFF_DISABLE)
401 ath5k_hw_reg_write(ah, AR5K_DCU_MISC_POST_FR_BKOFF_DIS,
402 AR5K_QUEUE_DFS_MISC(queue));
403
404 /* Enable/disable fragmentation burst backoff */
405 if (tq->tqi_flags & AR5K_TXQ_FLAG_FRAG_BURST_BACKOFF_ENABLE)
406 ath5k_hw_reg_write(ah, AR5K_DCU_MISC_BACKOFF_FRAG,
407 AR5K_QUEUE_DFS_MISC(queue));
408
409 /*
410 * Set registers by queue type
411 */
412 switch (tq->tqi_type) {
413 case AR5K_TX_QUEUE_BEACON:
414 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
415 AR5K_QCU_MISC_FRSHED_DBA_GT |
416 AR5K_QCU_MISC_CBREXP_BCN_DIS |
417 AR5K_QCU_MISC_BCN_ENABLE);
418
419 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
420 (AR5K_DCU_MISC_ARBLOCK_CTL_GLOBAL <<
421 AR5K_DCU_MISC_ARBLOCK_CTL_S) |
422 AR5K_DCU_MISC_ARBLOCK_IGNORE |
423 AR5K_DCU_MISC_POST_FR_BKOFF_DIS |
424 AR5K_DCU_MISC_BCN_ENABLE);
425 break;
426
427 case AR5K_TX_QUEUE_CAB:
428 /* XXX: use BCN_SENT_GT, if we can figure out how */
429 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
430 AR5K_QCU_MISC_FRSHED_DBA_GT |
431 AR5K_QCU_MISC_CBREXP_DIS |
432 AR5K_QCU_MISC_CBREXP_BCN_DIS);
433
434 ath5k_hw_reg_write(ah, ((tq->tqi_ready_time -
435 (AR5K_TUNE_SW_BEACON_RESP -
436 AR5K_TUNE_DMA_BEACON_RESP) -
437 AR5K_TUNE_ADDITIONAL_SWBA_BACKOFF) * 1024) |
438 AR5K_QCU_RDYTIMECFG_ENABLE,
439 AR5K_QUEUE_RDYTIMECFG(queue));
440
441 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_DFS_MISC(queue),
442 (AR5K_DCU_MISC_ARBLOCK_CTL_GLOBAL <<
443 AR5K_DCU_MISC_ARBLOCK_CTL_S));
444 break;
445
446 case AR5K_TX_QUEUE_UAPSD:
447 AR5K_REG_ENABLE_BITS(ah, AR5K_QUEUE_MISC(queue),
448 AR5K_QCU_MISC_CBREXP_DIS);
449 break;
450
451 case AR5K_TX_QUEUE_DATA:
452 default:
453 break;
454 }
455
456 /* TODO: Handle frame compression */
457
458 /*
459 * Enable interrupts for this tx queue
460 * in the secondary interrupt mask registers
461 */
462 if (tq->tqi_flags & AR5K_TXQ_FLAG_TXOKINT_ENABLE)
463 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txok, queue);
464
465 if (tq->tqi_flags & AR5K_TXQ_FLAG_TXERRINT_ENABLE)
466 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txerr, queue);
467
468 if (tq->tqi_flags & AR5K_TXQ_FLAG_TXURNINT_ENABLE)
469 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txurn, queue);
470
471 if (tq->tqi_flags & AR5K_TXQ_FLAG_TXDESCINT_ENABLE)
472 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txdesc, queue);
473
474 if (tq->tqi_flags & AR5K_TXQ_FLAG_TXEOLINT_ENABLE)
475 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_txeol, queue);
476
477 if (tq->tqi_flags & AR5K_TXQ_FLAG_CBRORNINT_ENABLE)
478 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_cbrorn, queue);
479
480 if (tq->tqi_flags & AR5K_TXQ_FLAG_CBRURNINT_ENABLE)
481 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_cbrurn, queue);
482
483 if (tq->tqi_flags & AR5K_TXQ_FLAG_QTRIGINT_ENABLE)
484 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_qtrig, queue);
485
486 if (tq->tqi_flags & AR5K_TXQ_FLAG_TXNOFRMINT_ENABLE)
487 AR5K_Q_ENABLE_BITS(ah->ah_txq_imr_nofrm, queue);
488
489 /* Update secondary interrupt mask registers */
490
491 /* Filter out inactive queues */
492 ah->ah_txq_imr_txok &= ah->ah_txq_status;
493 ah->ah_txq_imr_txerr &= ah->ah_txq_status;
494 ah->ah_txq_imr_txurn &= ah->ah_txq_status;
495 ah->ah_txq_imr_txdesc &= ah->ah_txq_status;
496 ah->ah_txq_imr_txeol &= ah->ah_txq_status;
497 ah->ah_txq_imr_cbrorn &= ah->ah_txq_status;
498 ah->ah_txq_imr_cbrurn &= ah->ah_txq_status;
499 ah->ah_txq_imr_qtrig &= ah->ah_txq_status;
500 ah->ah_txq_imr_nofrm &= ah->ah_txq_status;
501
502 ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_txok,
503 AR5K_SIMR0_QCU_TXOK) |
504 AR5K_REG_SM(ah->ah_txq_imr_txdesc,
505 AR5K_SIMR0_QCU_TXDESC),
506 AR5K_SIMR0);
507
508 ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_txerr,
509 AR5K_SIMR1_QCU_TXERR) |
510 AR5K_REG_SM(ah->ah_txq_imr_txeol,
511 AR5K_SIMR1_QCU_TXEOL),
512 AR5K_SIMR1);
513
514 /* Update SIMR2 but don't overwrite rest simr2 settings */
515 AR5K_REG_DISABLE_BITS(ah, AR5K_SIMR2, AR5K_SIMR2_QCU_TXURN);
516 AR5K_REG_ENABLE_BITS(ah, AR5K_SIMR2,
517 AR5K_REG_SM(ah->ah_txq_imr_txurn,
518 AR5K_SIMR2_QCU_TXURN));
519
520 ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_cbrorn,
521 AR5K_SIMR3_QCBRORN) |
522 AR5K_REG_SM(ah->ah_txq_imr_cbrurn,
523 AR5K_SIMR3_QCBRURN),
524 AR5K_SIMR3);
525
526 ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_qtrig,
527 AR5K_SIMR4_QTRIG), AR5K_SIMR4);
528
529 /* Set TXNOFRM_QCU for the queues with TXNOFRM enabled */
530 ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txq_imr_nofrm,
531 AR5K_TXNOFRM_QCU), AR5K_TXNOFRM);
532
533 /* No queue has TXNOFRM enabled, disable the interrupt
534 * by setting AR5K_TXNOFRM to zero */
535 if (ah->ah_txq_imr_nofrm == 0)
536 ath5k_hw_reg_write(ah, 0, AR5K_TXNOFRM);
537
538 /* Set QCU mask for this DCU to save power */
539 AR5K_REG_WRITE_Q(ah, AR5K_QUEUE_QCUMASK(queue), queue);
540
541 return 0;
542 }
543
544
545 /**************************\
546 * Global QCU/DCU functions *
547 \**************************/
548
549 /**
550 * ath5k_hw_set_ifs_intervals() - Set global inter-frame spaces on DCU
551 * @ah: The &struct ath5k_hw
552 * @slot_time: Slot time in us
553 *
554 * Sets the global IFS intervals on DCU (also works on AR5210) for
555 * the given slot time and the current bwmode.
556 */
557 int ath5k_hw_set_ifs_intervals(struct ath5k_hw *ah, unsigned int slot_time)
558 {
559 struct ieee80211_channel *channel = ah->ah_current_channel;
560 enum nl80211_band band;
561 struct ieee80211_supported_band *sband;
562 struct ieee80211_rate *rate;
563 u32 ack_tx_time, eifs, eifs_clock, sifs, sifs_clock;
564 u32 slot_time_clock = ath5k_hw_htoclock(ah, slot_time);
565 u32 rate_flags, i;
566
567 if (slot_time < 6 || slot_time_clock > AR5K_SLOT_TIME_MAX)
568 return -EINVAL;
569
570 sifs = ath5k_hw_get_default_sifs(ah);
571 sifs_clock = ath5k_hw_htoclock(ah, sifs - 2);
572
573 /* EIFS
574 * Txtime of ack at lowest rate + SIFS + DIFS
575 * (DIFS = SIFS + 2 * Slot time)
576 *
577 * Note: HAL has some predefined values for EIFS
578 * Turbo: (37 + 2 * 6)
579 * Default: (74 + 2 * 9)
580 * Half: (149 + 2 * 13)
581 * Quarter: (298 + 2 * 21)
582 *
583 * (74 + 2 * 6) for AR5210 default and turbo !
584 *
585 * According to the formula we have
586 * ack_tx_time = 25 for turbo and
587 * ack_tx_time = 42.5 * clock multiplier
588 * for default/half/quarter.
589 *
590 * This can't be right, 42 is what we would get
591 * from ath5k_hw_get_frame_dur_for_bwmode or
592 * ieee80211_generic_frame_duration for zero frame
593 * length and without SIFS !
594 *
595 * Also we have different lowest rate for 802.11a
596 */
597 if (channel->band == NL80211_BAND_5GHZ)
598 band = NL80211_BAND_5GHZ;
599 else
600 band = NL80211_BAND_2GHZ;
601
602 switch (ah->ah_bwmode) {
603 case AR5K_BWMODE_5MHZ:
604 rate_flags = IEEE80211_RATE_SUPPORTS_5MHZ;
605 break;
606 case AR5K_BWMODE_10MHZ:
607 rate_flags = IEEE80211_RATE_SUPPORTS_10MHZ;
608 break;
609 default:
610 rate_flags = 0;
611 break;
612 }
613 sband = &ah->sbands[band];
614 rate = NULL;
615 for (i = 0; i < sband->n_bitrates; i++) {
616 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
617 continue;
618 rate = &sband->bitrates[i];
619 break;
620 }
621 if (WARN_ON(!rate))
622 return -EINVAL;
623
624 ack_tx_time = ath5k_hw_get_frame_duration(ah, band, 10, rate, false);
625
626 /* ack_tx_time includes an SIFS already */
627 eifs = ack_tx_time + sifs + 2 * slot_time;
628 eifs_clock = ath5k_hw_htoclock(ah, eifs);
629
630 /* Set IFS settings on AR5210 */
631 if (ah->ah_version == AR5K_AR5210) {
632 u32 pifs, pifs_clock, difs, difs_clock;
633
634 /* Set slot time */
635 ath5k_hw_reg_write(ah, slot_time_clock, AR5K_SLOT_TIME);
636
637 /* Set EIFS */
638 eifs_clock = AR5K_REG_SM(eifs_clock, AR5K_IFS1_EIFS);
639
640 /* PIFS = Slot time + SIFS */
641 pifs = slot_time + sifs;
642 pifs_clock = ath5k_hw_htoclock(ah, pifs);
643 pifs_clock = AR5K_REG_SM(pifs_clock, AR5K_IFS1_PIFS);
644
645 /* DIFS = SIFS + 2 * Slot time */
646 difs = sifs + 2 * slot_time;
647 difs_clock = ath5k_hw_htoclock(ah, difs);
648
649 /* Set SIFS/DIFS */
650 ath5k_hw_reg_write(ah, (difs_clock <<
651 AR5K_IFS0_DIFS_S) | sifs_clock,
652 AR5K_IFS0);
653
654 /* Set PIFS/EIFS and preserve AR5K_INIT_CARR_SENSE_EN */
655 ath5k_hw_reg_write(ah, pifs_clock | eifs_clock |
656 (AR5K_INIT_CARR_SENSE_EN << AR5K_IFS1_CS_EN_S),
657 AR5K_IFS1);
658
659 return 0;
660 }
661
662 /* Set IFS slot time */
663 ath5k_hw_reg_write(ah, slot_time_clock, AR5K_DCU_GBL_IFS_SLOT);
664
665 /* Set EIFS interval */
666 ath5k_hw_reg_write(ah, eifs_clock, AR5K_DCU_GBL_IFS_EIFS);
667
668 /* Set SIFS interval in usecs */
669 AR5K_REG_WRITE_BITS(ah, AR5K_DCU_GBL_IFS_MISC,
670 AR5K_DCU_GBL_IFS_MISC_SIFS_DUR_USEC,
671 sifs);
672
673 /* Set SIFS interval in clock cycles */
674 ath5k_hw_reg_write(ah, sifs_clock, AR5K_DCU_GBL_IFS_SIFS);
675
676 return 0;
677 }
678
679
680 /**
681 * ath5k_hw_init_queues() - Initialize tx queues
682 * @ah: The &struct ath5k_hw
683 *
684 * Initializes all tx queues based on information on
685 * ah->ah_txq* set by the driver
686 */
687 int
688 ath5k_hw_init_queues(struct ath5k_hw *ah)
689 {
690 int i, ret;
691
692 /* TODO: HW Compression support for data queues */
693 /* TODO: Burst prefetch for data queues */
694
695 /*
696 * Reset queues and start beacon timers at the end of the reset routine
697 * This also sets QCU mask on each DCU for 1:1 qcu to dcu mapping
698 * Note: If we want we can assign multiple qcus on one dcu.
699 */
700 if (ah->ah_version != AR5K_AR5210)
701 for (i = 0; i < ah->ah_capabilities.cap_queues.q_tx_num; i++) {
702 ret = ath5k_hw_reset_tx_queue(ah, i);
703 if (ret) {
704 ATH5K_ERR(ah,
705 "failed to reset TX queue #%d\n", i);
706 return ret;
707 }
708 }
709 else
710 /* No QCU/DCU on AR5210, just set tx
711 * retry limits. We set IFS parameters
712 * on ath5k_hw_set_ifs_intervals */
713 ath5k_hw_set_tx_retry_limits(ah, 0);
714
715 /* Set the turbo flag when operating on 40MHz */
716 if (ah->ah_bwmode == AR5K_BWMODE_40MHZ)
717 AR5K_REG_ENABLE_BITS(ah, AR5K_DCU_GBL_IFS_MISC,
718 AR5K_DCU_GBL_IFS_MISC_TURBO_MODE);
719
720 /* If we didn't set IFS timings through
721 * ath5k_hw_set_coverage_class make sure
722 * we set them here */
723 if (!ah->ah_coverage_class) {
724 unsigned int slot_time = ath5k_hw_get_default_slottime(ah);
725 ath5k_hw_set_ifs_intervals(ah, slot_time);
726 }
727
728 return 0;
729 }