2 * carl9170 firmware - used by the ar9170 wireless device
4 * Interface to the WLAN part of the chip
6 * Copyright (c) 2000-2005 ZyDAS Technology Corporation
7 * Copyright (c) 2007-2009 Atheros Communications, Inc.
8 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 * Copyright 2009, 2010 Christian Lamparter <chunkeey@googlemail.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include "shared/phy.h"
33 #include "linux/ieee80211.h"
35 static void wlan_txunstuck(unsigned int queue)
37 set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head) | 1);
38 wlan_trigger(BIT(queue));
41 static void wlan_txupdate(unsigned int queue)
43 set_wlan_txq_dma_addr(queue, ((uint32_t) fw.wlan.tx_queue[queue].head));
44 wlan_trigger(BIT(queue));
47 static void wlan_dma_bump(unsigned int qidx)
49 unsigned int offset = qidx;
50 uint32_t status, trigger;
52 status = get(AR9170_MAC_REG_DMA_STATUS) >> 12;
53 trigger = get(AR9170_MAC_REG_DMA_TRIGGER) >> 12;
64 if ((trigger == 0xa) && (status == 0x8)) {
73 #ifdef CONFIG_CARL9170FW_DEBUG
74 static void wlan_dump_queue(unsigned int qidx)
77 struct dma_desc *desc;
78 struct carl9170_tx_superframe *super;
81 __for_each_desc(desc, &fw.wlan.tx_queue[qidx]) {
82 super = get_super(desc);
83 DBG("%d: %p s:%x c:%x tl:%x ds:%x n:%p l:%p ", entries, desc,
84 desc->status, desc->ctrl, desc->totalLen,
85 desc->dataSize, desc->nextAddr, desc->lastAddr);
87 DBG("c:%x tr:%d ri:%d l:%x m:%x p:%x fc:%x",
88 super->s.cookie, super->s.cnt, super->s.rix,
89 super->f.hdr.length, super->f.hdr.mac.set,
90 (unsigned int) le32_to_cpu(super->f.hdr.phy.set),
91 super->f.data.i3e.frame_control);
96 desc = get_wlan_txq_addr(qidx);
98 DBG("Queue: %d: te:%d td:%d h:%p c:%p t:%p",
99 qidx, entries, queue_len(&fw.wlan.tx_queue[qidx]),
100 fw.wlan.tx_queue[qidx].head,
101 desc, fw.wlan.tx_queue[qidx].terminator);
103 DBG("HW: t:%x s:%x ac:%x c:%x",
104 (unsigned int) get(AR9170_MAC_REG_DMA_TRIGGER),
105 (unsigned int) get(AR9170_MAC_REG_DMA_STATUS),
106 (unsigned int) get(AR9170_MAC_REG_AMPDU_COUNT),
107 (unsigned int) get(AR9170_MAC_REG_DMA_TXQX_ADDR_CURR));
109 #endif /* CONFIG_CARL9170FW_DEBUG */
111 static void wlan_send_buffered_tx_status(void)
115 while (fw.wlan.tx_status_pending) {
116 len = min((unsigned int)fw.wlan.tx_status_pending,
117 CARL9170_RSP_TX_STATUS_NUM);
118 len = min(len, CARL9170_TX_STATUS_NUM - fw.wlan.tx_status_head_idx);
121 * rather than memcpy each individual request into a large buffer,
122 * we _splice_ them all together.
124 * The only downside is however that we have to be careful around
125 * the edges of the tx_status_cache.
128 * Each tx_status is about 2 bytes. However every command package
129 * must have a size which is a multiple of 4.
132 send_cmd_to_host((len * sizeof(struct carl9170_tx_status) + 3) & ~3,
133 CARL9170_RSP_TXCOMP, len, (void *)
134 &fw.wlan.tx_status_cache[fw.wlan.tx_status_head_idx]);
136 fw.wlan.tx_status_pending -= len;
137 fw.wlan.tx_status_head_idx += len;
138 fw.wlan.tx_status_head_idx %= CARL9170_TX_STATUS_NUM;
142 static struct carl9170_tx_status *wlan_get_tx_status_buffer(void)
144 struct carl9170_tx_status *tmp;
146 tmp = &fw.wlan.tx_status_cache[fw.wlan.tx_status_tail_idx++];
147 fw.wlan.tx_status_tail_idx %= CARL9170_TX_STATUS_NUM;
149 if (fw.wlan.tx_status_pending == CARL9170_TX_STATUS_NUM)
150 wlan_send_buffered_tx_status();
152 fw.wlan.tx_status_pending++;
157 /* generate _aggregated_ tx_status for the host */
158 static void wlan_tx_complete(struct carl9170_tx_superframe *super,
161 struct carl9170_tx_status *status;
163 status = wlan_get_tx_status_buffer();
166 * The *unique* cookie and AC_ID is used by the driver for
169 status->cookie = super->s.cookie;
170 status->queue = super->s.queue;
173 * This field holds the number of tries of the rate in
174 * the rate index field (rix).
176 status->rix = super->s.rix;
177 status->tries = super->s.cnt;
178 status->success = (txs) ? 1 : 0;
181 static bool wlan_tx_consume_retry(struct carl9170_tx_superframe *super)
183 /* check if this was the last possible retry with this rate */
184 if (unlikely(super->s.cnt >= super->s.tries[super->s.rix])) {
185 /* end of the road - indicate tx failure */
186 if (unlikely(super->s.rix == CARL9170_TX_MAX_RETRY_RATES))
189 /* check if there are alternative rates available */
190 if (!super->s.rr[super->s.rix].set)
193 /* try next retry rate */
194 super->f.hdr.phy.set = super->s.rr[super->s.rix].set;
196 /* finally - mark the old rate as USED */
199 /* reinitialize try counter */
202 /* just increase retry counter */
210 static void __wlan_tx(struct dma_desc *desc)
212 struct carl9170_tx_superframe *super = get_super(desc);
213 #ifdef CONFIG_CARL9170FW_NORMAL_TX_RX
214 unsigned int queue = super->s.queue;
215 #endif /* CONFIG_CARL9170FW_LOOPBACK */
217 if (unlikely(super->s.fill_in_tsf)) {
218 struct ieee80211_mgmt *mgmt = (void *) &super->f.data.i3e;
219 uint32_t *tsf = (uint32_t *) &mgmt->u.probe_resp.timestamp;
222 * Truth be told: this is a hack.
224 * The *real* TSF is definitely going to be higher/older.
225 * But this hardware emulation code is head and shoulders
226 * above anything a driver can possibly do.
228 * (even, if it's got an accurate atomic clock source).
234 #if (defined CONFIG_CARL9170FW_LOOPBACK) || (defined CONFIG_CARL9170FW_DISCARD)
235 wlan_tx_complete(super, true);
237 # ifdef CONFIG_CARL9170FW_LOOPBACK
238 dma_put(&fw.pta.up_queue, desc);
240 # elif CONFIG_CARL9170FW_DISCARD
241 dma_reclaim(&fw.pta.down_queue, desc);
244 #else /* CONFIG_CARL9170FW_LOOPBACK */
246 # if ((defined CONFIG_CARL9170FW_DEBUG) && (defined CONFIG_CARL9170FW_PSM))
247 BUG_ON(fw.phy.psm.state != CARL9170_PSM_WAKE);
248 # endif /* CONFIG_CARL9170FW_DEBUG && CONFIG_CARL9170FW_PSM */
250 /* insert desc into the right queue */
251 dma_put(&fw.wlan.tx_queue[queue], desc);
252 wlan_trigger(BIT(queue));
253 #endif /* CONFIG_CARL9170FW_LOOPBACK */
256 /* prepares frame for the first transmission */
257 static void _wlan_tx(struct dma_desc *desc)
259 struct carl9170_tx_superframe *super = get_super(desc);
261 if (unlikely(super->s.ampdu_commit_density)) {
262 set(AR9170_MAC_REG_AMPDU_DENSITY,
263 MOD_VAL(AR9170_MAC_AMPDU_DENSITY,
264 get(AR9170_MAC_REG_AMPDU_DENSITY),
265 super->s.ampdu_density));
268 if (unlikely(super->s.ampdu_commit_factor)) {
269 set(AR9170_MAC_REG_AMPDU_FACTOR,
270 MOD_VAL(AR9170_MAC_AMPDU_FACTOR,
271 get(AR9170_MAC_REG_AMPDU_FACTOR),
272 8 << super->s.ampdu_factor));
278 /* propagate transmission status back to the driver */
279 static bool wlan_tx_status(struct dma_queue *queue,
280 struct dma_desc *desc)
282 struct ar9170_tx_frame *frame = DESC_PAYLOAD(desc);
283 struct carl9170_tx_superframe *super = get_super(desc);
284 struct ieee80211_hdr *hdr = &super->f.data.i3e;
285 unsigned int qidx = super->s.queue;
286 bool txfail, success;
290 if (!!(desc->ctrl & AR9170_CTRL_FAIL_MASK)) {
291 txfail = !!(desc->ctrl & AR9170_CTRL_TXFAIL);
293 /* reset retry indicator flags */
294 desc->ctrl &= ~(AR9170_CTRL_TXFAIL | AR9170_CTRL_BAFAIL);
296 if (wlan_tx_consume_retry(super)) {
298 * retry for simple and aggregated 802.11 frames.
300 * Note: We must not mess up the original frame
304 if (!frame->hdr.mac.ampdu) {
306 * 802.11 - 7.1.3.1.5.
307 * set "Retry Field" for consecutive attempts
309 * Note: For AMPDU see:
310 * 802.11n 9.9.1.6 "Retransmit Procedures"
313 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_RETRY);
317 /* Normal TX Failure */
319 /* demise descriptor ownership back to the hardware */
323 * And this will get the queue going again.
324 * To understand why: you have to get the HW
325 * specs... But sadly I never saw them.
327 wlan_txunstuck(qidx);
329 /* abort cycle - this is necessary due to HW design */
332 /* (HT-) BlockACK failure */
335 * Unlink the failed attempt and put it into
336 * the retry queue. The caller routine must
337 * be aware of this so the frames don't get lost.
340 dma_unlink_head(queue);
341 #ifdef CONFIG_CARL9170FW_DELAYED_TX
342 dma_put(&fw.wlan.tx_retry, desc);
345 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
349 /* out of frame attempts - discard frame */
354 dma_unlink_head(queue);
357 * Issue the queue bump,
358 * We need to do this in case this was the frame's last
359 * possible retry attempt and it unfortunately: it failed.
362 wlan_txunstuck(qidx);
367 /* update hangcheck */
368 fw.wlan.last_tx_desc_num[qidx] = 0;
370 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
371 if (unlikely(super == (void *) &dma_mem.reserved.ba)) {
372 fw.wlan.ba_desc = desc;
373 fw.wlan.ba_desc_available = 1;
376 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
378 wlan_tx_complete(super, success);
380 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
381 if (unlikely(super->s.cab))
382 fw.wlan.cab_queue_len--;
383 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
385 /* recycle freed descriptors */
386 dma_reclaim(&fw.pta.down_queue, desc);
391 static void handle_tx_completion(void)
393 struct dma_desc *desc;
396 for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
397 __while_desc_bits(desc, &fw.wlan.tx_queue[i], AR9170_OWN_BITS_SW) {
398 if (!wlan_tx_status(&fw.wlan.tx_queue[i], desc)) {
399 /* termination requested. */
404 #ifdef CONFIG_CARL9170FW_DELAYED_TX
405 for_each_desc(desc, &fw.wlan.tx_retry)
408 for_each_desc(desc, &fw.wlan.tx_delay[i])
410 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
414 void __hot wlan_tx(struct dma_desc *desc)
416 struct carl9170_tx_superframe *super = DESC_PAYLOAD(desc);
418 /* initialize rate control struct */
423 #ifdef CONFIG_CARL9170FW_DELAYED_TX
424 if (!queue_empty(&fw.wlan.tx_queue[super->s.queue])) {
425 dma_put(&fw.wlan.tx_delay[super->s.queue], desc);
428 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
430 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
431 if (unlikely(super->s.cab)) {
432 fw.wlan.cab_queue_len++;
433 dma_put(&fw.wlan.cab_queue, desc);
436 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
441 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
442 static void wlan_send_buffered_ba(void)
444 struct carl9170_tx_ba_superframe *baf = &dma_mem.reserved.ba.ba;
445 struct ieee80211_ba *ba = (struct ieee80211_ba *) &baf->f.ba;
446 struct carl9170_bar_ctx *ctx;
448 if (likely(fw.wlan.ba_head_idx == fw.wlan.ba_tail_idx))
451 /* there's no point to continue when the ba_desc is not available. */
452 if (!fw.wlan.ba_desc_available)
455 ctx = &fw.wlan.ba_cache[fw.wlan.ba_head_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
456 fw.wlan.ba_head_idx++;
458 /* Format BlockAck */
459 fw.wlan.ba_desc->status = 0;
460 fw.wlan.ba_desc->ctrl = AR9170_CTRL_FS_BIT | AR9170_CTRL_LS_BIT;
461 fw.wlan.ba_desc_available = 0;
462 fw.wlan.ba_desc->nextAddr = fw.wlan.ba_desc->lastAddr =
465 baf->s.len = fw.wlan.ba_desc->totalLen = fw.wlan.ba_desc->dataSize =
466 sizeof(struct carl9170_tx_superdesc) +
467 sizeof(struct ar9170_tx_hwdesc) +
468 sizeof(struct ieee80211_ba);
472 baf->f.hdr.length = sizeof(struct ieee80211_ba) + FCS_LEN;
474 /* HW Duration / Backoff */
475 baf->f.hdr.mac.backoff = 1;
476 baf->f.hdr.mac.hw_duration = 1;
478 /* take the TX rate from the RX'd BAR */
479 baf->f.hdr.phy.set = ctx->phy;
480 baf->f.hdr.phy.tx_power = 29; /* 14.5 dBm */
482 /* format outgoing BA */
483 ba->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_BACK);
484 ba->duration = cpu_to_le16(0);
485 memcpy(ba->ta, ctx->ta, 6);
486 memcpy(ba->ra, ctx->ra, 6);
489 * Unfortunately, we cannot look into the hardware's scoreboard.
490 * Therefore we have to proceed as described in 802.11n 9.10.7.5
491 * and send a null BlockAck.
493 memset(ba->bitmap, 0x0, sizeof(ba->bitmap));
497 * not entirely sure if this is 100% correct?!
499 ba->control = ctx->control | cpu_to_le16(1);
500 ba->start_seq_num = ctx->start_seq_num;
502 wlan_tx(fw.wlan.ba_desc);
505 static struct carl9170_bar_ctx *wlan_get_bar_cache_buffer(void)
507 struct carl9170_bar_ctx *tmp;
509 /* expire oldest entry, if we ran out of ba_ctx' */
510 if (fw.wlan.ba_head_idx + CONFIG_CARL9170FW_BACK_REQS_NUM < fw.wlan.ba_tail_idx)
511 fw.wlan.ba_head_idx++;
513 tmp = &fw.wlan.ba_cache[fw.wlan.ba_tail_idx % CONFIG_CARL9170FW_BACK_REQS_NUM];
514 fw.wlan.ba_tail_idx++;
519 static void handle_bar(struct dma_desc *desc)
521 struct ieee80211_hdr *hdr;
522 struct ieee80211_bar *bar;
523 struct carl9170_bar_ctx *ctx;
525 hdr = ar9170_get_rx_i3e(desc);
527 /* check if this is a BAR for us */
528 if (likely(!ieee80211_is_back_req(hdr->frame_control)))
531 if (unlikely(ar9170_get_rx_macstatus_error(desc))) {
533 * This check does a number of things:
534 * 1. checks if the frame is in good nick
535 * 2. checks if the RA (MAC) matches
540 if (unlikely(ar9170_get_rx_mpdu_len(desc) <
541 sizeof(struct ieee80211_bar))) {
543 * Sneaky, corrupted BARs... but not with us!
551 if ((bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_MULTI_TID)) ||
552 !(bar->control & cpu_to_le16(IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA))) {
553 /* not implemented yet */
558 ctx = wlan_get_bar_cache_buffer();
560 /* Brilliant! The BAR provides all necessary MACs! */
561 memcpy(ctx->ra, bar->ta, 6);
562 memcpy(ctx->ta, bar->ra, 6);
566 * not entirely sure if this is 100% correct to force the
567 * imm ack bit or not...
569 ctx->control = bar->control | cpu_to_le16(1);
570 ctx->start_seq_num = bar->start_seq_num;
571 ctx->phy = ar9170_rx_to_phy(desc);
572 if (unlikely(!ctx->phy)) {
573 /* provide a backup, in case ar9170_rx_to_phy fails */
574 ctx->phy = cpu_to_le32(0x2cc301);
577 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
579 static void wlan_check_rx_overrun(void)
581 uint32_t overruns, total;
583 fw.wlan.rx_total += total = get(AR9170_MAC_REG_RX_TOTAL);
584 fw.wlan.rx_overruns += overruns = get(AR9170_MAC_REG_RX_OVERRUN);
585 if (unlikely(overruns)) {
586 if (overruns == total) {
593 static void handle_rx(void)
595 struct dma_desc *desc;
597 wlan_check_rx_overrun();
599 for_each_desc_not_bits(desc, &fw.wlan.rx_queue, AR9170_OWN_BITS_HW) {
600 if (unlikely(desc->totalLen < 26 ||
601 desc->totalLen > CONFIG_CARL9170FW_RX_FRAME_LEN)) {
603 * This frame is too damaged to do anything
606 dma_reclaim(&fw.wlan.rx_queue, desc);
607 _wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
609 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
611 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
613 dma_put(&fw.pta.up_queue, desc);
619 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
620 static uint8_t *beacon_find_ie(uint8_t ie)
622 struct ieee80211_mgmt *mgmt = getp(AR9170_MAC_REG_BCN_ADDR);
626 len = get(AR9170_MAC_REG_BCN_LENGTH);
628 if (len < FCS_LEN + sizeof(mgmt))
631 pos = mgmt->u.beacon.variable;
632 end = (uint8_t *) ((unsigned long)mgmt + (len - FCS_LEN));
634 if (pos + 2 + pos[1] > end)
646 static void wlan_cab_flush_queue(void)
648 struct dma_desc *desc;
650 struct ieee80211_tim_ie *ie;
653 * This prevents the code from sending new BC/MC frames
654 * which were queued after the previous buffered traffic
655 * has been sent out... They will have to wait until the
656 * next DTIM beacon comes along.
658 if (unlikely(fw.wlan.cab_flush_trigger == CARL9170_CAB_TRIGGER_DEFER))
661 _ie = beacon_find_ie(WLAN_EID_TIM);
665 ie = (struct ieee80211_tim_ie *) &_ie[2];
667 /* Ideally, check here for == AR9170_CAB_TRIGGER_ARMED */
668 if (fw.wlan.cab_flush_trigger) {
669 /* move queued frames into the main tx queues */
670 for_each_desc(desc, &fw.wlan.cab_queue) {
671 struct carl9170_tx_superframe *super = get_super(desc);
673 if (!queue_empty(&fw.wlan.cab_queue)) {
675 * Set MOREDATA flag for all,
676 * but the last queued frame.
677 * see: 802.11-2007 11.2.1.5 f)
679 * This is actually the reason to why
680 * we need to prevent the reentry.
683 super->f.data.i3e.frame_control |=
684 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
686 super->f.data.i3e.frame_control &=
687 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
695 /* Transfer finished - waiting for tx status */
696 fw.wlan.cab_flush_trigger = CARL9170_CAB_TRIGGER_DEFER;
699 static void wlan_cab_modify_dtim_beacon(void)
702 struct ieee80211_tim_ie *ie;
704 _ie = beacon_find_ie(WLAN_EID_TIM);
706 ie = (struct ieee80211_tim_ie *) &_ie[2];
708 if (!queue_empty(&fw.wlan.cab_queue) && (ie->dtim_count == 0)) {
709 /* schedule DTIM transfer */
710 fw.wlan.cab_flush_trigger = CARL9170_CAB_TRIGGER_ARMED;
711 } else if ((fw.wlan.cab_queue_len == 0) && (fw.wlan.cab_flush_trigger)) {
712 /* undo all chances to the beacon structure */
713 ie->bitmap_ctrl &= ~0x1;
714 fw.wlan.cab_flush_trigger = CARL9170_CAB_TRIGGER_EMPTY;
717 if (fw.wlan.cab_flush_trigger) {
718 /* Set the almighty Multicast Traffic Indication Bit. */
719 ie->bitmap_ctrl |= 0x1;
723 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
725 static void handle_beacon_config(void)
729 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
731 * The application has now updated the relevant beacon data.
732 * Now it should be the perfect time to apply the DTIM
733 * multicast information.
736 wlan_cab_modify_dtim_beacon();
737 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
739 bcn_count = get(AR9170_MAC_REG_BCN_COUNT);
740 send_cmd_to_host(4, CARL9170_RSP_BEACON_CONFIG, 0x00,
741 (uint8_t *) &bcn_count);
744 static void handle_pretbtt(void)
746 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
747 fw.wlan.cab_flush_time = get_clock_counter();
748 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
750 #ifdef CONFIG_CARL9170FW_PSM
753 send_cmd_to_host(4, CARL9170_RSP_PRETBTT, 0x00,
754 (uint8_t *) &fw.phy.psm.state);
756 send_cmd_to_host(0, CARL9170_RSP_PRETBTT, 0x00, NULL);
757 #endif /* CONFIG_CARL9170FW_PSM */
761 static void handle_atim(void)
763 send_cmd_to_host(0, CARL9170_RSP_ATIM, 0x00, NULL);
766 #ifdef CONFIG_CARL9170FW_DEBUG
767 static void handle_qos(void)
770 * What is the QoS Bit used for?
771 * Is it only an indicator for TXOP & Burst, or
772 * should we do something here?
776 static void handle_radar(void)
778 send_cmd_to_host(0, CARL9170_RSP_RADAR, 0x00, NULL);
780 #endif /* CONFIG_CARL9170FW_DEBUG */
782 static void wlan_janitor(void)
784 #ifdef CONFIG_CARL9170FW_CAB_QUEUE
785 if (unlikely(fw.wlan.cab_flush_trigger)) {
787 * This is hardcoded into carl9170usb driver.
789 * The driver must set the PRETBTT event to beacon_interval -
790 * CARL9170_PRETBTT_KUS (usually 6) Kus.
792 * But still, we can only do so much about 802.11-2007 9.3.2.1 &
793 * 11.2.1.6. Let's hope the current solution is adequate enough.
796 if (is_after_msecs(fw.wlan.cab_flush_time,
797 (CARL9170_TBTT_DELTA))) {
798 wlan_cab_flush_queue();
801 #endif /* CONFIG_CARL9170FW_CAB_QUEUE */
803 #ifdef CONFIG_CARL9170FW_DELAYED_TX
804 if (fw.wlan.tx_trigger) {
805 _wlan_trigger(fw.wlan.tx_trigger);
806 fw.wlan.tx_trigger = 0;
808 #endif /* CONFIG_CARL9170FW_DELAYED_TX */
810 wlan_send_buffered_tx_status();
812 #ifdef CONFIG_CARL9170FW_HANDLE_BACK_REQ
813 wlan_send_buffered_ba();
814 #endif /* CONFIG_CARL9170FW_HANDLE_BACK_REQ */
817 void handle_wlan(void)
821 intr = get(AR9170_MAC_REG_INT_CTRL);
823 set(AR9170_MAC_REG_INT_CTRL, intr);
825 #define HANDLER(intr, flag, func) \
827 if ((intr & flag) != 0) { \
832 HANDLER(intr, AR9170_MAC_INT_PRETBTT, handle_pretbtt);
834 HANDLER(intr, AR9170_MAC_INT_ATIM, handle_atim);
836 HANDLER(intr, AR9170_MAC_INT_RXC, handle_rx);
838 HANDLER(intr, (AR9170_MAC_INT_TXC | AR9170_MAC_INT_RETRY_FAIL),
839 handle_tx_completion);
841 #ifdef CONFIG_CARL9170FW_DEBUG
842 HANDLER(intr, AR9170_MAC_INT_QOS, handle_qos);
844 HANDLER(intr, AR9170_MAC_INT_RADAR, handle_radar);
845 #endif /* CONFIG_CARL9170FW_DEBUG */
847 HANDLER(intr, AR9170_MAC_INT_CFG_BCN, handle_beacon_config);
850 DBG("Unhandled Interrupt %x\n", (unsigned int) intr);
857 static void wlan_check_hang(void)
859 struct dma_desc *desc;
862 for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
863 if (queue_empty(&fw.wlan.tx_queue[i])) {
864 /* Nothing to do here... move along */
868 /* fetch the current DMA queue position */
869 desc = get_wlan_txq_addr(i);
871 /* Stuck frame detection */
872 if (unlikely(desc == fw.wlan.last_tx_desc[i])) {
873 fw.wlan.last_tx_desc_num[i]++;
875 if (unlikely(fw.wlan.last_tx_desc_num[i] > 6)) {
877 * schedule MAC reset (aka OFF/ON => dead)
879 * This will almost certainly kill
880 * the device for good, but it's the
881 * recommended thing to do...
887 #ifdef CONFIG_CARL9170FW_DEBUG
888 if (unlikely(fw.wlan.last_tx_desc_num[i] > 5)) {
890 * Sigh, the queue is almost certainly
891 * dead. Dump the queue content to the
892 * user, maybe we find out why it got
898 #endif /* CONFIG_CARL9170FW_DEBUG */
900 if (unlikely(fw.wlan.last_tx_desc_num[i] > 3)) {
902 * Hrrm, bump the queue a bit.
903 * maybe this will get it going again.
910 fw.wlan.last_tx_desc[i] = desc;
911 fw.wlan.last_tx_desc_num[i] = 0;
917 * NB: Resetting the MAC is a two-edged sword.
918 * On most occasions, it does what it is supposed to do.
919 * But there is a chance that this will make it
920 * even worse and the radio dies silently.
922 static void wlan_mac_reset(void)
925 uint32_t agg_wait_counter;
926 uint32_t agg_density;
927 uint32_t bcn_start_addr;
931 uint32_t rts_cts_tpc;
934 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
936 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
940 /* Save aggregation parameters */
941 agg_wait_counter = get(AR9170_MAC_REG_AMPDU_FACTOR);
942 agg_density = get(AR9170_MAC_REG_AMPDU_DENSITY);
944 bcn_start_addr = get(AR9170_MAC_REG_BCN_ADDR);
946 cam_mode = get(AR9170_MAC_REG_CAM_MODE);
947 rctl = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L);
948 rcth = get(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H);
950 ack_power = get(AR9170_MAC_REG_ACK_TPC);
951 rts_cts_tpc = get(AR9170_MAC_REG_RTS_CTS_TPC);
953 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
954 /* 0x1c8960 write only */
955 rx_BB = get(AR9170_PHY_REG_SWITCH_CHAIN_0);
956 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
958 /* TX/RX must be stopped by now */
959 val = get(AR9170_MAC_REG_POWER_STATE_CTRL);
961 val |= AR9170_MAC_POWER_STATE_CTRL_RESET;
964 * Manipulate CCA threshold to stop transmission
966 * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x300);
970 * check Rx state in 0(idle) 9(disable)
972 * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
973 * while( (chState != 0) && (chState != 9)) {
974 * chState = (get(AR9170_MAC_REG_MISC_684) >> 16) & 0xf;
978 set(AR9170_MAC_REG_POWER_STATE_CTRL, val);
982 /* Restore aggregation parameters */
983 set(AR9170_MAC_REG_AMPDU_FACTOR, agg_wait_counter);
984 set(AR9170_MAC_REG_AMPDU_DENSITY, agg_density);
986 set(AR9170_MAC_REG_BCN_ADDR, bcn_start_addr);
987 set(AR9170_MAC_REG_CAM_MODE, cam_mode);
988 set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_L, rctl);
989 set(AR9170_MAC_REG_CAM_ROLL_CALL_TBL_H, rcth);
991 set(AR9170_MAC_REG_RTS_CTS_TPC, rts_cts_tpc);
992 set(AR9170_MAC_REG_ACK_TPC, ack_power);
994 #ifdef CONFIG_CARL9170FW_RADIO_FUNCTIONS
995 set(AR9170_PHY_REG_SWITCH_CHAIN_2, rx_BB);
996 #endif /* CONFIG_CARL9170FW_RADIO_FUNCTIONS */
999 * Manipulate CCA threshold to resume transmission
1001 * set(AR9170_PHY_REG_CCA_THRESHOLD, 0x0);
1004 for (i = 0; i < __AR9170_NUM_TX_QUEUES; i++) {
1005 DBG("Q:%d l:%d h:%p t:%p\n", i, queue_len(&fw.wlan.tx_queue[i]),
1006 fw.wlan.tx_queue[i].head, fw.wlan.tx_queue[i].terminator);
1008 set_wlan_txq_dma_addr(i, (uint32_t) fw.wlan.tx_queue[i].head);
1010 if (!queue_empty(&fw.wlan.tx_queue[i]))
1011 wlan_trigger(BIT(i));
1015 set(AR9170_MAC_REG_DMA_RXQ_ADDR, (uint32_t) fw.wlan.rx_queue.head);
1016 wlan_trigger(AR9170_DMA_TRIGGER_RXQ);
1019 void __cold wlan_timer(void)
1021 unsigned int cached_mac_reset;
1023 cached_mac_reset = fw.wlan.mac_reset;
1025 /* TX Queue Hang check */
1028 /* RX Overrun check */
1029 wlan_check_rx_overrun();
1031 if (unlikely(fw.wlan.mac_reset >= CARL9170_MAC_RESET_RESET)) {
1033 fw.wlan.mac_reset = CARL9170_MAC_RESET_OFF;
1035 if (fw.wlan.mac_reset && cached_mac_reset == fw.wlan.mac_reset)
1036 fw.wlan.mac_reset--;